diff --git a/fixtures/blocks/src/server/App.block.js b/fixtures/blocks/src/server/App.block.js
index 4a73c58faa7a..9347bbe0cf57 100644
--- a/fixtures/blocks/src/server/App.block.js
+++ b/fixtures/blocks/src/server/App.block.js
@@ -7,7 +7,7 @@
 /* eslint-disable import/first */
 
 import * as React from 'react';
-import {block} from 'react';
+import {unstable_block as block} from 'react';
 
 // Server
 
diff --git a/fixtures/dom/src/__tests__/wrong-act-test.js b/fixtures/dom/src/__tests__/wrong-act-test.js
index 38029be9b9ca..da574e337a83 100644
--- a/fixtures/dom/src/__tests__/wrong-act-test.js
+++ b/fixtures/dom/src/__tests__/wrong-act-test.js
@@ -179,7 +179,7 @@ it("doesn't warn if you use nested acts from different renderers", () => {
 
 if (__EXPERIMENTAL__) {
   it('warns when using createRoot() + .render', () => {
-    const root = ReactDOM.createRoot(document.createElement('div'));
+    const root = ReactDOM.unstable_createRoot(document.createElement('div'));
     expect(() => {
       TestRenderer.act(() => {
         root.render(<App />);
diff --git a/packages/react-debug-tools/src/__tests__/ReactHooksInspectionIntegration-test.js b/packages/react-debug-tools/src/__tests__/ReactHooksInspectionIntegration-test.js
index cca7a71dd603..23503b7c54e0 100644
--- a/packages/react-debug-tools/src/__tests__/ReactHooksInspectionIntegration-test.js
+++ b/packages/react-debug-tools/src/__tests__/ReactHooksInspectionIntegration-test.js
@@ -366,121 +366,123 @@ describe('ReactHooksInspectionIntegration', () => {
     ]);
   });
 
-  if (__EXPERIMENTAL__) {
-    it('should support composite useTransition hook', () => {
-      function Foo(props) {
-        React.useTransition();
-        const memoizedValue = React.useMemo(() => 'hello', []);
-        return <div>{memoizedValue}</div>;
-      }
-      const renderer = ReactTestRenderer.create(<Foo />);
-      const childFiber = renderer.root.findByType(Foo)._currentFiber();
-      const tree = ReactDebugTools.inspectHooksOfFiber(childFiber);
-      expect(tree).toEqual([
-        {
-          id: 0,
-          isStateEditable: false,
-          name: 'Transition',
-          value: undefined,
-          subHooks: [],
-        },
-        {
-          id: 1,
-          isStateEditable: false,
-          name: 'Memo',
-          value: 'hello',
-          subHooks: [],
-        },
-      ]);
-    });
-
-    it('should support composite useDeferredValue hook', () => {
-      function Foo(props) {
-        React.useDeferredValue('abc', {
-          timeoutMs: 500,
-        });
-        const [state] = React.useState(() => 'hello', []);
-        return <div>{state}</div>;
-      }
-      const renderer = ReactTestRenderer.create(<Foo />);
-      const childFiber = renderer.root.findByType(Foo)._currentFiber();
-      const tree = ReactDebugTools.inspectHooksOfFiber(childFiber);
-      expect(tree).toEqual([
-        {
-          id: 0,
-          isStateEditable: false,
-          name: 'DeferredValue',
-          value: 'abc',
-          subHooks: [],
-        },
-        {
-          id: 1,
-          isStateEditable: true,
-          name: 'State',
-          value: 'hello',
-          subHooks: [],
-        },
-      ]);
-    });
-
-    it('should support composite useOpaqueIdentifier hook', () => {
-      function Foo(props) {
-        const id = React.unstable_useOpaqueIdentifier();
-        const [state] = React.useState(() => 'hello', []);
-        return <div id={id}>{state}</div>;
-      }
-
-      const renderer = ReactTestRenderer.create(<Foo />);
-      const childFiber = renderer.root.findByType(Foo)._currentFiber();
-      const tree = ReactDebugTools.inspectHooksOfFiber(childFiber);
-
-      expect(tree.length).toEqual(2);
-
-      expect(tree[0].id).toEqual(0);
-      expect(tree[0].isStateEditable).toEqual(false);
-      expect(tree[0].name).toEqual('OpaqueIdentifier');
-      expect((tree[0].value + '').startsWith('c_')).toBe(true);
+  // @gate experimental
+  it('should support composite useTransition hook', () => {
+    function Foo(props) {
+      React.unstable_useTransition();
+      const memoizedValue = React.useMemo(() => 'hello', []);
+      return <div>{memoizedValue}</div>;
+    }
+    const renderer = ReactTestRenderer.create(<Foo />);
+    const childFiber = renderer.root.findByType(Foo)._currentFiber();
+    const tree = ReactDebugTools.inspectHooksOfFiber(childFiber);
+    expect(tree).toEqual([
+      {
+        id: 0,
+        isStateEditable: false,
+        name: 'Transition',
+        value: undefined,
+        subHooks: [],
+      },
+      {
+        id: 1,
+        isStateEditable: false,
+        name: 'Memo',
+        value: 'hello',
+        subHooks: [],
+      },
+    ]);
+  });
 
-      expect(tree[1]).toEqual({
+  // @gate experimental
+  it('should support composite useDeferredValue hook', () => {
+    function Foo(props) {
+      React.unstable_useDeferredValue('abc', {
+        timeoutMs: 500,
+      });
+      const [state] = React.useState(() => 'hello', []);
+      return <div>{state}</div>;
+    }
+    const renderer = ReactTestRenderer.create(<Foo />);
+    const childFiber = renderer.root.findByType(Foo)._currentFiber();
+    const tree = ReactDebugTools.inspectHooksOfFiber(childFiber);
+    expect(tree).toEqual([
+      {
+        id: 0,
+        isStateEditable: false,
+        name: 'DeferredValue',
+        value: 'abc',
+        subHooks: [],
+      },
+      {
         id: 1,
         isStateEditable: true,
         name: 'State',
         value: 'hello',
         subHooks: [],
-      });
+      },
+    ]);
+  });
+
+  // @gate experimental
+  it('should support composite useOpaqueIdentifier hook', () => {
+    function Foo(props) {
+      const id = React.unstable_useOpaqueIdentifier();
+      const [state] = React.useState(() => 'hello', []);
+      return <div id={id}>{state}</div>;
+    }
+
+    const renderer = ReactTestRenderer.create(<Foo />);
+    const childFiber = renderer.root.findByType(Foo)._currentFiber();
+    const tree = ReactDebugTools.inspectHooksOfFiber(childFiber);
+
+    expect(tree.length).toEqual(2);
+
+    expect(tree[0].id).toEqual(0);
+    expect(tree[0].isStateEditable).toEqual(false);
+    expect(tree[0].name).toEqual('OpaqueIdentifier');
+    expect((tree[0].value + '').startsWith('c_')).toBe(true);
+
+    expect(tree[1]).toEqual({
+      id: 1,
+      isStateEditable: true,
+      name: 'State',
+      value: 'hello',
+      subHooks: [],
     });
+  });
 
-    it('should support composite useOpaqueIdentifier hook in concurrent mode', () => {
-      function Foo(props) {
-        const id = React.unstable_useOpaqueIdentifier();
-        const [state] = React.useState(() => 'hello', []);
-        return <div id={id}>{state}</div>;
-      }
+  // @gate experimental
+  it('should support composite useOpaqueIdentifier hook in concurrent mode', () => {
+    function Foo(props) {
+      const id = React.unstable_useOpaqueIdentifier();
+      const [state] = React.useState(() => 'hello', []);
+      return <div id={id}>{state}</div>;
+    }
 
-      const renderer = ReactTestRenderer.create(<Foo />, {
-        unstable_isConcurrent: true,
-      });
-      expect(Scheduler).toFlushWithoutYielding();
+    const renderer = ReactTestRenderer.create(<Foo />, {
+      unstable_isConcurrent: true,
+    });
+    expect(Scheduler).toFlushWithoutYielding();
 
-      const childFiber = renderer.root.findByType(Foo)._currentFiber();
-      const tree = ReactDebugTools.inspectHooksOfFiber(childFiber);
+    const childFiber = renderer.root.findByType(Foo)._currentFiber();
+    const tree = ReactDebugTools.inspectHooksOfFiber(childFiber);
 
-      expect(tree.length).toEqual(2);
+    expect(tree.length).toEqual(2);
 
-      expect(tree[0].id).toEqual(0);
-      expect(tree[0].isStateEditable).toEqual(false);
-      expect(tree[0].name).toEqual('OpaqueIdentifier');
-      expect((tree[0].value + '').startsWith('c_')).toBe(true);
+    expect(tree[0].id).toEqual(0);
+    expect(tree[0].isStateEditable).toEqual(false);
+    expect(tree[0].name).toEqual('OpaqueIdentifier');
+    expect((tree[0].value + '').startsWith('c_')).toBe(true);
 
-      expect(tree[1]).toEqual({
-        id: 1,
-        isStateEditable: true,
-        name: 'State',
-        value: 'hello',
-        subHooks: [],
-      });
+    expect(tree[1]).toEqual({
+      id: 1,
+      isStateEditable: true,
+      name: 'State',
+      value: 'hello',
+      subHooks: [],
     });
-  }
+  });
 
   describe('useDebugValue', () => {
     it('should support inspectable values for multiple custom hooks', () => {
diff --git a/packages/react-devtools-shared/src/__tests__/store-test.js b/packages/react-devtools-shared/src/__tests__/store-test.js
index 201b73ffc9c4..8d713ed2f2cd 100644
--- a/packages/react-devtools-shared/src/__tests__/store-test.js
+++ b/packages/react-devtools-shared/src/__tests__/store-test.js
@@ -352,18 +352,18 @@ describe('Store', () => {
       };
       const Wrapper = ({shouldSuspense}) => (
         <React.Fragment>
-          <React.SuspenseList revealOrder="forwards" tail="collapsed">
+          <React.unstable_SuspenseList revealOrder="forwards" tail="collapsed">
             <Component key="A" />
             <React.Suspense fallback={<Loading />}>
               {shouldSuspense ? <SuspendingComponent /> : <Component key="B" />}
             </React.Suspense>
             <Component key="C" />
-          </React.SuspenseList>
+          </React.unstable_SuspenseList>
         </React.Fragment>
       );
 
       const container = document.createElement('div');
-      const root = ReactDOM.createRoot(container);
+      const root = ReactDOM.unstable_createRoot(container);
       act(() => {
         root.render(<Wrapper shouldSuspense={true} />);
       });
diff --git a/packages/react-devtools-shared/src/__tests__/storeStressTestConcurrent-test.js b/packages/react-devtools-shared/src/__tests__/storeStressTestConcurrent-test.js
index 360b78a3ad2e..1090e24a0f73 100644
--- a/packages/react-devtools-shared/src/__tests__/storeStressTestConcurrent-test.js
+++ b/packages/react-devtools-shared/src/__tests__/storeStressTestConcurrent-test.js
@@ -63,7 +63,7 @@ describe('StoreStressConcurrent', () => {
     // 1. Render a normal version of [a, b, c, d, e].
     let container = document.createElement('div');
     // $FlowFixMe
-    let root = ReactDOM.createRoot(container);
+    let root = ReactDOM.unstable_createRoot(container);
     act(() => root.render(<Parent>{[a, b, c, d, e]}</Parent>));
     expect(store).toMatchInlineSnapshot(
       `
@@ -147,7 +147,7 @@ describe('StoreStressConcurrent', () => {
       // Ensure fresh mount.
       container = document.createElement('div');
       // $FlowFixMe
-      root = ReactDOM.createRoot(container);
+      root = ReactDOM.unstable_createRoot(container);
 
       // Verify mounting 'abcde'.
       act(() => root.render(<Parent>{cases[i]}</Parent>));
@@ -177,7 +177,7 @@ describe('StoreStressConcurrent', () => {
     // There'll be no unmounting until the very end.
     container = document.createElement('div');
     // $FlowFixMe
-    root = ReactDOM.createRoot(container);
+    root = ReactDOM.unstable_createRoot(container);
     for (let i = 0; i < cases.length; i++) {
       // Verify mounting 'abcde'.
       act(() => root.render(<Parent>{cases[i]}</Parent>));
@@ -243,7 +243,7 @@ describe('StoreStressConcurrent', () => {
     const snapshots = [];
     let container = document.createElement('div');
     // $FlowFixMe
-    let root = ReactDOM.createRoot(container);
+    let root = ReactDOM.unstable_createRoot(container);
     for (let i = 0; i < steps.length; i++) {
       act(() => root.render(<Root>{steps[i]}</Root>));
       // We snapshot each step once so it doesn't regress.
@@ -316,7 +316,7 @@ describe('StoreStressConcurrent', () => {
       for (let j = 0; j < steps.length; j++) {
         container = document.createElement('div');
         // $FlowFixMe
-        root = ReactDOM.createRoot(container);
+        root = ReactDOM.unstable_createRoot(container);
         act(() => root.render(<Root>{steps[i]}</Root>));
         expect(print(store)).toMatch(snapshots[i]);
         act(() => root.render(<Root>{steps[j]}</Root>));
@@ -333,7 +333,7 @@ describe('StoreStressConcurrent', () => {
       for (let j = 0; j < steps.length; j++) {
         container = document.createElement('div');
         // $FlowFixMe
-        root = ReactDOM.createRoot(container);
+        root = ReactDOM.unstable_createRoot(container);
         act(() =>
           root.render(
             <Root>
@@ -405,7 +405,7 @@ describe('StoreStressConcurrent', () => {
     const snapshots = [];
     let container = document.createElement('div');
     // $FlowFixMe
-    let root = ReactDOM.createRoot(container);
+    let root = ReactDOM.unstable_createRoot(container);
     for (let i = 0; i < steps.length; i++) {
       act(() =>
         root.render(
@@ -532,7 +532,7 @@ describe('StoreStressConcurrent', () => {
         // Always start with a fresh container and steps[i].
         container = document.createElement('div');
         // $FlowFixMe
-        root = ReactDOM.createRoot(container);
+        root = ReactDOM.unstable_createRoot(container);
         act(() =>
           root.render(
             <Root>
@@ -578,7 +578,7 @@ describe('StoreStressConcurrent', () => {
         // Always start with a fresh container and steps[i].
         container = document.createElement('div');
         // $FlowFixMe
-        root = ReactDOM.createRoot(container);
+        root = ReactDOM.unstable_createRoot(container);
         act(() =>
           root.render(
             <Root>
@@ -636,7 +636,7 @@ describe('StoreStressConcurrent', () => {
         // Always start with a fresh container and steps[i].
         container = document.createElement('div');
         // $FlowFixMe
-        root = ReactDOM.createRoot(container);
+        root = ReactDOM.unstable_createRoot(container);
         act(() =>
           root.render(
             <Root>
@@ -686,7 +686,7 @@ describe('StoreStressConcurrent', () => {
         // Always start with a fresh container and steps[i].
         container = document.createElement('div');
         // $FlowFixMe
-        root = ReactDOM.createRoot(container);
+        root = ReactDOM.unstable_createRoot(container);
         act(() =>
           root.render(
             <Root>
@@ -740,7 +740,7 @@ describe('StoreStressConcurrent', () => {
         // Always start with a fresh container and steps[i].
         container = document.createElement('div');
         // $FlowFixMe
-        root = ReactDOM.createRoot(container);
+        root = ReactDOM.unstable_createRoot(container);
         act(() =>
           root.render(
             <Root>
@@ -894,7 +894,7 @@ describe('StoreStressConcurrent', () => {
     const snapshots = [];
     let container = document.createElement('div');
     // $FlowFixMe
-    let root = ReactDOM.createRoot(container);
+    let root = ReactDOM.unstable_createRoot(container);
     for (let i = 0; i < steps.length; i++) {
       act(() =>
         root.render(
@@ -1051,7 +1051,7 @@ describe('StoreStressConcurrent', () => {
         // Always start with a fresh container and steps[i].
         container = document.createElement('div');
         // $FlowFixMe
-        root = ReactDOM.createRoot(container);
+        root = ReactDOM.unstable_createRoot(container);
         act(() =>
           root.render(
             <Root>
@@ -1103,7 +1103,7 @@ describe('StoreStressConcurrent', () => {
         // Always start with a fresh container and steps[i].
         container = document.createElement('div');
         // $FlowFixMe
-        root = ReactDOM.createRoot(container);
+        root = ReactDOM.unstable_createRoot(container);
         act(() =>
           root.render(
             <Root>
@@ -1170,7 +1170,7 @@ describe('StoreStressConcurrent', () => {
         // Always start with a fresh container and steps[i].
         container = document.createElement('div');
         // $FlowFixMe
-        root = ReactDOM.createRoot(container);
+        root = ReactDOM.unstable_createRoot(container);
         act(() =>
           root.render(
             <Root>
@@ -1222,7 +1222,7 @@ describe('StoreStressConcurrent', () => {
         // Always start with a fresh container and steps[i].
         container = document.createElement('div');
         // $FlowFixMe
-        root = ReactDOM.createRoot(container);
+        root = ReactDOM.unstable_createRoot(container);
         act(() =>
           root.render(
             <Root>
@@ -1274,7 +1274,7 @@ describe('StoreStressConcurrent', () => {
         // Always start with a fresh container and steps[i].
         container = document.createElement('div');
         // $FlowFixMe
-        root = ReactDOM.createRoot(container);
+        root = ReactDOM.unstable_createRoot(container);
         act(() =>
           root.render(
             <Root>
diff --git a/packages/react-dom/index.classic.fb.js b/packages/react-dom/index.classic.fb.js
index 1264badae76c..04c59dbc55b3 100644
--- a/packages/react-dom/index.classic.fb.js
+++ b/packages/react-dom/index.classic.fb.js
@@ -29,7 +29,9 @@ export {
   render,
   unmountComponentAtNode,
   createRoot,
+  createRoot as unstable_createRoot,
   createBlockingRoot,
+  createBlockingRoot as unstable_createBlockingRoot,
   unstable_flushControlled,
   unstable_scheduleHydration,
   unstable_renderSubtreeIntoContainer,
diff --git a/packages/react-dom/index.experimental.js b/packages/react-dom/index.experimental.js
index 40676689ee28..dba70ca2b6c9 100644
--- a/packages/react-dom/index.experimental.js
+++ b/packages/react-dom/index.experimental.js
@@ -19,8 +19,8 @@ export {
   render,
   unmountComponentAtNode,
   // exposeConcurrentModeAPIs
-  createRoot,
-  createBlockingRoot,
+  createRoot as unstable_createRoot,
+  createBlockingRoot as unstable_createBlockingRoot,
   unstable_flushControlled,
   unstable_scheduleHydration,
   // Disabled behind disableUnstableRenderSubtreeIntoContainer
diff --git a/packages/react-dom/index.js b/packages/react-dom/index.js
index 3714de11244f..2487bf5e4980 100644
--- a/packages/react-dom/index.js
+++ b/packages/react-dom/index.js
@@ -7,4 +7,24 @@
  * @flow
  */
 
-export * from './src/client/ReactDOM';
+// Export all exports so that they're available in tests.
+// We can't use export * from in Flow for some reason.
+export {
+  createPortal,
+  unstable_batchedUpdates,
+  flushSync,
+  __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED,
+  version,
+  findDOMNode,
+  hydrate,
+  render,
+  unmountComponentAtNode,
+  createRoot,
+  createRoot as unstable_createRoot,
+  createBlockingRoot,
+  createBlockingRoot as unstable_createBlockingRoot,
+  unstable_flushControlled,
+  unstable_scheduleHydration,
+  unstable_renderSubtreeIntoContainer,
+  unstable_createPortal,
+} from './src/client/ReactDOM';
diff --git a/packages/react-dom/index.modern.fb.js b/packages/react-dom/index.modern.fb.js
index 258e12303ec1..ae9262a3801f 100644
--- a/packages/react-dom/index.modern.fb.js
+++ b/packages/react-dom/index.modern.fb.js
@@ -14,7 +14,9 @@ export {
   __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED,
   version,
   createRoot,
+  createRoot as unstable_createRoot,
   createBlockingRoot,
+  createBlockingRoot as unstable_createBlockingRoot,
   unstable_flushControlled,
   unstable_scheduleHydration,
 } from './src/client/ReactDOM';
diff --git a/packages/react-dom/src/__tests__/ReactDOMFiberAsync-test.js b/packages/react-dom/src/__tests__/ReactDOMFiberAsync-test.js
index c98fdabcbcf2..d6baddbe45c9 100644
--- a/packages/react-dom/src/__tests__/ReactDOMFiberAsync-test.js
+++ b/packages/react-dom/src/__tests__/ReactDOMFiberAsync-test.js
@@ -192,7 +192,7 @@ describe('ReactDOMFiberAsync', () => {
           );
         }
       }
-      const root = ReactDOM.createRoot(container);
+      const root = ReactDOM.unstable_createRoot(container);
       root.render(<Counter />);
       Scheduler.unstable_flushAll();
       expect(asyncValueRef.current.textContent).toBe('');
@@ -213,7 +213,7 @@ describe('ReactDOMFiberAsync', () => {
 
     // @gate experimental
     it('top-level updates are concurrent', () => {
-      const root = ReactDOM.createRoot(container);
+      const root = ReactDOM.unstable_createRoot(container);
       root.render(<div>Hi</div>);
       expect(container.textContent).toEqual('');
       Scheduler.unstable_flushAll();
@@ -236,7 +236,7 @@ describe('ReactDOMFiberAsync', () => {
         }
       }
 
-      const root = ReactDOM.createRoot(container);
+      const root = ReactDOM.unstable_createRoot(container);
       root.render(<Component />);
       expect(container.textContent).toEqual('');
       Scheduler.unstable_flushAll();
@@ -267,7 +267,7 @@ describe('ReactDOMFiberAsync', () => {
         }
       }
 
-      const root = ReactDOM.createRoot(container);
+      const root = ReactDOM.unstable_createRoot(container);
       root.render(<Component />);
       Scheduler.unstable_flushAll();
 
@@ -309,7 +309,7 @@ describe('ReactDOMFiberAsync', () => {
           return this.state.counter;
         }
       }
-      const root = ReactDOM.createRoot(container);
+      const root = ReactDOM.unstable_createRoot(container);
       root.render(<Counter />);
       Scheduler.unstable_flushAll();
       expect(container.textContent).toEqual('0');
@@ -423,7 +423,7 @@ describe('ReactDOMFiberAsync', () => {
         }
       }
 
-      const root = ReactDOM.createRoot(container);
+      const root = ReactDOM.unstable_createRoot(container);
       root.render(<Form />);
       // Flush
       Scheduler.unstable_flushAll();
@@ -490,7 +490,7 @@ describe('ReactDOMFiberAsync', () => {
         }
       }
 
-      const root = ReactDOM.createRoot(container);
+      const root = ReactDOM.unstable_createRoot(container);
       root.render(<Form />);
       // Flush
       Scheduler.unstable_flushAll();
@@ -551,7 +551,7 @@ describe('ReactDOMFiberAsync', () => {
         }
       }
 
-      const root = ReactDOM.createRoot(container);
+      const root = ReactDOM.unstable_createRoot(container);
       root.render(<Form />);
       // Flush
       Scheduler.unstable_flushAll();
@@ -614,7 +614,7 @@ describe('ReactDOMFiberAsync', () => {
   describe('createBlockingRoot', () => {
     // @gate experimental
     it('updates flush without yielding in the next event', () => {
-      const root = ReactDOM.createBlockingRoot(container);
+      const root = ReactDOM.unstable_createBlockingRoot(container);
 
       function Text(props) {
         Scheduler.unstable_yieldValue(props.text);
@@ -661,7 +661,7 @@ describe('ReactDOMFiberAsync', () => {
       return <button ref={ref}>new</button>;
     }
 
-    const oldRoot = ReactDOM.createRoot(container);
+    const oldRoot = ReactDOM.unstable_createRoot(container);
     act(() => {
       oldRoot.render(<OldApp />);
     });
@@ -673,7 +673,7 @@ describe('ReactDOMFiberAsync', () => {
     expect(container.textContent).toBe('');
 
     // We can now render a new one.
-    const newRoot = ReactDOM.createRoot(container);
+    const newRoot = ReactDOM.unstable_createRoot(container);
     ReactDOM.flushSync(() => {
       newRoot.render(<NewApp />);
     });
diff --git a/packages/react-dom/src/__tests__/ReactDOMHooks-test.js b/packages/react-dom/src/__tests__/ReactDOMHooks-test.js
index 1968bf4726b2..59ec9dd4f7a9 100644
--- a/packages/react-dom/src/__tests__/ReactDOMHooks-test.js
+++ b/packages/react-dom/src/__tests__/ReactDOMHooks-test.js
@@ -126,7 +126,7 @@ describe('ReactDOMHooks', () => {
     const inputRef = createRef();
     const labelRef = createRef();
 
-    const root = ReactDOM.createRoot(container);
+    const root = ReactDOM.unstable_createRoot(container);
     root.render(<Example inputRef={inputRef} labelRef={labelRef} />);
 
     Scheduler.unstable_flushAll();
diff --git a/packages/react-dom/src/__tests__/ReactDOMRoot-test.js b/packages/react-dom/src/__tests__/ReactDOMRoot-test.js
index 29acb9ba1582..25a560c5c32a 100644
--- a/packages/react-dom/src/__tests__/ReactDOMRoot-test.js
+++ b/packages/react-dom/src/__tests__/ReactDOMRoot-test.js
@@ -28,13 +28,13 @@ describe('ReactDOMRoot', () => {
 
   if (!__EXPERIMENTAL__) {
     it('createRoot is not exposed in stable build', () => {
-      expect(ReactDOM.createRoot).toBe(undefined);
+      expect(ReactDOM.unstable_createRoot).toBe(undefined);
     });
     return;
   }
 
   it('renders children', () => {
-    const root = ReactDOM.createRoot(container);
+    const root = ReactDOM.unstable_createRoot(container);
     root.render(<div>Hi</div>);
     Scheduler.unstable_flushAll();
     expect(container.textContent).toEqual('Hi');
@@ -42,7 +42,7 @@ describe('ReactDOMRoot', () => {
 
   it('warns if a callback parameter is provided to render', () => {
     const callback = jest.fn();
-    const root = ReactDOM.createRoot(container);
+    const root = ReactDOM.unstable_createRoot(container);
     expect(() =>
       root.render(<div>Hi</div>, callback),
     ).toErrorDev(
@@ -56,7 +56,7 @@ describe('ReactDOMRoot', () => {
 
   it('warns if a callback parameter is provided to unmount', () => {
     const callback = jest.fn();
-    const root = ReactDOM.createRoot(container);
+    const root = ReactDOM.unstable_createRoot(container);
     root.render(<div>Hi</div>);
     expect(() =>
       root.unmount(callback),
@@ -70,7 +70,7 @@ describe('ReactDOMRoot', () => {
   });
 
   it('unmounts children', () => {
-    const root = ReactDOM.createRoot(container);
+    const root = ReactDOM.unstable_createRoot(container);
     root.render(<div>Hi</div>);
     Scheduler.unstable_flushAll();
     expect(container.textContent).toEqual('Hi');
@@ -93,7 +93,7 @@ describe('ReactDOMRoot', () => {
     // Does not hydrate by default
     const container1 = document.createElement('div');
     container1.innerHTML = markup;
-    const root1 = ReactDOM.createRoot(container1);
+    const root1 = ReactDOM.unstable_createRoot(container1);
     root1.render(
       <div>
         <span />
@@ -104,7 +104,7 @@ describe('ReactDOMRoot', () => {
     // Accepts `hydrate` option
     const container2 = document.createElement('div');
     container2.innerHTML = markup;
-    const root2 = ReactDOM.createRoot(container2, {hydrate: true});
+    const root2 = ReactDOM.unstable_createRoot(container2, {hydrate: true});
     root2.render(
       <div>
         <span />
@@ -136,7 +136,7 @@ describe('ReactDOMRoot', () => {
 
   it('clears existing children', async () => {
     container.innerHTML = '<div>a</div><div>b</div>';
-    const root = ReactDOM.createRoot(container);
+    const root = ReactDOM.unstable_createRoot(container);
     root.render(
       <div>
         <span>c</span>
@@ -157,12 +157,12 @@ describe('ReactDOMRoot', () => {
 
   it('throws a good message on invalid containers', () => {
     expect(() => {
-      ReactDOM.createRoot(<div>Hi</div>);
+      ReactDOM.unstable_createRoot(<div>Hi</div>);
     }).toThrow('createRoot(...): Target container is not a DOM element.');
   });
 
   it('warns when rendering with legacy API into createRoot() container', () => {
-    const root = ReactDOM.createRoot(container);
+    const root = ReactDOM.unstable_createRoot(container);
     root.render(<div>Hi</div>);
     Scheduler.unstable_flushAll();
     expect(container.textContent).toEqual('Hi');
@@ -185,7 +185,7 @@ describe('ReactDOMRoot', () => {
   });
 
   it('warns when hydrating with legacy API into createRoot() container', () => {
-    const root = ReactDOM.createRoot(container);
+    const root = ReactDOM.unstable_createRoot(container);
     root.render(<div>Hi</div>);
     Scheduler.unstable_flushAll();
     expect(container.textContent).toEqual('Hi');
@@ -205,7 +205,7 @@ describe('ReactDOMRoot', () => {
   });
 
   it('warns when unmounting with legacy API (no previous content)', () => {
-    const root = ReactDOM.createRoot(container);
+    const root = ReactDOM.unstable_createRoot(container);
     root.render(<div>Hi</div>);
     Scheduler.unstable_flushAll();
     expect(container.textContent).toEqual('Hi');
@@ -234,7 +234,7 @@ describe('ReactDOMRoot', () => {
     // Currently createRoot().render() doesn't clear this.
     container.appendChild(document.createElement('div'));
     // The rest is the same as test above.
-    const root = ReactDOM.createRoot(container);
+    const root = ReactDOM.unstable_createRoot(container);
     root.render(<div>Hi</div>);
     Scheduler.unstable_flushAll();
     expect(container.textContent).toEqual('Hi');
@@ -260,7 +260,7 @@ describe('ReactDOMRoot', () => {
   it('warns when passing legacy container to createRoot()', () => {
     ReactDOM.render(<div>Hi</div>, container);
     expect(() => {
-      ReactDOM.createRoot(container);
+      ReactDOM.unstable_createRoot(container);
     }).toErrorDev(
       'You are calling ReactDOM.createRoot() on a container that was previously ' +
         'passed to ReactDOM.render(). This is not supported.',
@@ -269,9 +269,9 @@ describe('ReactDOMRoot', () => {
   });
 
   it('warns when creating two roots managing the same container', () => {
-    ReactDOM.createRoot(container);
+    ReactDOM.unstable_createRoot(container);
     expect(() => {
-      ReactDOM.createRoot(container);
+      ReactDOM.unstable_createRoot(container);
     }).toErrorDev(
       'You are calling ReactDOM.createRoot() on a container that ' +
         'has already been passed to createRoot() before. Instead, call ' +
@@ -281,15 +281,15 @@ describe('ReactDOMRoot', () => {
   });
 
   it('does not warn when creating second root after first one is unmounted', () => {
-    const root = ReactDOM.createRoot(container);
+    const root = ReactDOM.unstable_createRoot(container);
     root.unmount();
     Scheduler.unstable_flushAll();
-    ReactDOM.createRoot(container); // No warning
+    ReactDOM.unstable_createRoot(container); // No warning
   });
 
   it('warns if creating a root on the document.body', async () => {
     expect(() => {
-      ReactDOM.createRoot(document.body);
+      ReactDOM.unstable_createRoot(document.body);
     }).toErrorDev(
       'createRoot(): Creating roots directly with document.body is ' +
         'discouraged, since its children are often manipulated by third-party ' +
@@ -301,7 +301,7 @@ describe('ReactDOMRoot', () => {
   });
 
   it('warns if updating a root that has had its contents removed', async () => {
-    const root = ReactDOM.createRoot(container);
+    const root = ReactDOM.unstable_createRoot(container);
     root.render(<div>Hi</div>);
     Scheduler.unstable_flushAll();
     container.innerHTML = '';
diff --git a/packages/react-dom/src/__tests__/ReactDOMServerIntegrationHooks-test.js b/packages/react-dom/src/__tests__/ReactDOMServerIntegrationHooks-test.js
index c087ec93765c..8c90d593a74a 100644
--- a/packages/react-dom/src/__tests__/ReactDOMServerIntegrationHooks-test.js
+++ b/packages/react-dom/src/__tests__/ReactDOMServerIntegrationHooks-test.js
@@ -1051,7 +1051,7 @@ describe('ReactDOMServerHooks', () => {
         document.body.append(container);
 
         container.innerHTML = ReactDOMServer.renderToString(<App />);
-        const root = ReactDOM.createRoot(container, {hydrate: true});
+        const root = ReactDOM.unstable_createRoot(container, {hydrate: true});
         root.render(<App />);
         Scheduler.unstable_flushAll();
         jest.runAllTimers();
@@ -1136,7 +1136,7 @@ describe('ReactDOMServerHooks', () => {
         const container = document.createElement('div');
         document.body.append(container);
         container.innerHTML = ReactDOMServer.renderToString(<App />);
-        const root = ReactDOM.createRoot(container, {hydrate: true});
+        const root = ReactDOM.unstable_createRoot(container, {hydrate: true});
         ReactTestUtils.act(() => {
           root.render(<App />);
         });
@@ -1196,7 +1196,7 @@ describe('ReactDOMServerHooks', () => {
         const container = document.createElement('div');
         document.body.append(container);
         container.innerHTML = ReactDOMServer.renderToString(<App />);
-        const root = ReactDOM.createRoot(container, {hydrate: true});
+        const root = ReactDOM.unstable_createRoot(container, {hydrate: true});
         ReactTestUtils.act(() => {
           root.render(<App />);
         });
@@ -1291,7 +1291,7 @@ describe('ReactDOMServerHooks', () => {
 
         const childOneSpan = container.getElementsByTagName('span')[0];
 
-        const root = ReactDOM.createRoot(container, {hydrate: true});
+        const root = ReactDOM.unstable_createRoot(container, {hydrate: true});
         root.render(<App show={false} />);
         expect(Scheduler).toHaveYielded([]);
 
@@ -1397,7 +1397,7 @@ describe('ReactDOMServerHooks', () => {
         container.innerHTML = ReactDOMServer.renderToString(<App />);
 
         suspend = true;
-        const root = ReactDOM.createRoot(container, {hydrate: true});
+        const root = ReactDOM.unstable_createRoot(container, {hydrate: true});
         await ReactTestUtils.act(async () => {
           root.render(<App />);
         });
@@ -1447,7 +1447,9 @@ describe('ReactDOMServerHooks', () => {
 
         // This is the wrong HTML string
         container.innerHTML = '<span></span>';
-        ReactDOM.createRoot(container, {hydrate: true}).render(<App />);
+        ReactDOM.unstable_createRoot(container, {hydrate: true}).render(
+          <App />,
+        );
         expect(() =>
           expect(() => Scheduler.unstable_flushAll()).toThrow(),
         ).toErrorDev([
@@ -1497,7 +1499,7 @@ describe('ReactDOMServerHooks', () => {
         container.innerHTML = ReactDOMServer.renderToString(<App />);
 
         suspend = false;
-        const root = ReactDOM.createRoot(container, {hydrate: true});
+        const root = ReactDOM.unstable_createRoot(container, {hydrate: true});
         await ReactTestUtils.act(async () => {
           root.render(<App />);
         });
@@ -1533,7 +1535,9 @@ describe('ReactDOMServerHooks', () => {
 
         // This is the wrong HTML string
         container.innerHTML = '<span></span>';
-        ReactDOM.createRoot(container, {hydrate: true}).render(<App />);
+        ReactDOM.unstable_createRoot(container, {hydrate: true}).render(
+          <App />,
+        );
         expect(() =>
           expect(() => Scheduler.unstable_flushAll()).toThrow(),
         ).toErrorDev([
@@ -1555,7 +1559,9 @@ describe('ReactDOMServerHooks', () => {
 
         // This is the wrong HTML string
         container.innerHTML = '<span></span>';
-        ReactDOM.createRoot(container, {hydrate: true}).render(<App />);
+        ReactDOM.unstable_createRoot(container, {hydrate: true}).render(
+          <App />,
+        );
         expect(() =>
           expect(() => Scheduler.unstable_flushAll()).toThrow(
             'The object passed back from useOpaqueIdentifier is meant to be passed through to attributes only. ' +
@@ -1584,7 +1590,9 @@ describe('ReactDOMServerHooks', () => {
 
         // This is the wrong HTML string
         container.innerHTML = '<span></span>';
-        ReactDOM.createRoot(container, {hydrate: true}).render(<App />);
+        ReactDOM.unstable_createRoot(container, {hydrate: true}).render(
+          <App />,
+        );
         expect(() =>
           expect(() => Scheduler.unstable_flushAll()).toThrow(
             'The object passed back from useOpaqueIdentifier is meant to be passed through to attributes only. ' +
@@ -1612,7 +1620,9 @@ describe('ReactDOMServerHooks', () => {
         document.body.appendChild(container);
 
         container.innerHTML = ReactDOMServer.renderToString(<App />);
-        ReactDOM.createRoot(container, {hydrate: true}).render(<App />);
+        ReactDOM.unstable_createRoot(container, {hydrate: true}).render(
+          <App />,
+        );
         expect(() =>
           expect(() => Scheduler.unstable_flushAll()).toThrow(
             'The object passed back from useOpaqueIdentifier is meant to be passed through to attributes only. ' +
@@ -1637,7 +1647,9 @@ describe('ReactDOMServerHooks', () => {
         document.body.appendChild(container);
 
         container.innerHTML = ReactDOMServer.renderToString(<App />);
-        ReactDOM.createRoot(container, {hydrate: true}).render(<App />);
+        ReactDOM.unstable_createRoot(container, {hydrate: true}).render(
+          <App />,
+        );
         expect(() =>
           expect(() => Scheduler.unstable_flushAll()).toThrow(
             'The object passed back from useOpaqueIdentifier is meant to be passed through to attributes only. ' +
@@ -1670,7 +1682,9 @@ describe('ReactDOMServerHooks', () => {
 
         container.innerHTML = ReactDOMServer.renderToString(<App />);
 
-        ReactDOM.createRoot(container, {hydrate: true}).render(<App />);
+        ReactDOM.unstable_createRoot(container, {hydrate: true}).render(
+          <App />,
+        );
 
         if (gate(flags => flags.new)) {
           expect(() => Scheduler.unstable_flushAll()).toErrorDev([
@@ -1712,7 +1726,9 @@ describe('ReactDOMServerHooks', () => {
 
         container.innerHTML = ReactDOMServer.renderToString(<App />);
 
-        ReactDOM.createRoot(container, {hydrate: true}).render(<App />);
+        ReactDOM.unstable_createRoot(container, {hydrate: true}).render(
+          <App />,
+        );
 
         if (gate(flags => flags.new)) {
           expect(() => Scheduler.unstable_flushAll()).toErrorDev([
@@ -1772,7 +1788,9 @@ describe('ReactDOMServerHooks', () => {
             .getAttribute('aria-labelledby'),
         ).toEqual(serverID);
 
-        ReactDOM.createRoot(container, {hydrate: true}).render(<App />);
+        ReactDOM.unstable_createRoot(container, {hydrate: true}).render(
+          <App />,
+        );
         jest.runAllTimers();
         expect(Scheduler).toHaveYielded([]);
         expect(Scheduler).toFlushAndYield([]);
diff --git a/packages/react-dom/src/__tests__/ReactServerRenderingHydration-test.js b/packages/react-dom/src/__tests__/ReactServerRenderingHydration-test.js
index 770740e59102..0ad352648c3e 100644
--- a/packages/react-dom/src/__tests__/ReactServerRenderingHydration-test.js
+++ b/packages/react-dom/src/__tests__/ReactServerRenderingHydration-test.js
@@ -496,7 +496,7 @@ describe('ReactDOMServerHydration', () => {
     const finalHTML = ReactDOMServer.renderToString(<div />);
     const container = document.createElement('div');
     container.innerHTML = finalHTML;
-    const root = ReactDOM.createRoot(container, {hydrate: true});
+    const root = ReactDOM.unstable_createRoot(container, {hydrate: true});
     root.render(<div />);
     Scheduler.unstable_flushAll();
     root.render(null);
diff --git a/packages/react-dom/src/__tests__/ReactTestUtilsAct-test.js b/packages/react-dom/src/__tests__/ReactTestUtilsAct-test.js
index 0629a810fc90..8b72f084c367 100644
--- a/packages/react-dom/src/__tests__/ReactTestUtilsAct-test.js
+++ b/packages/react-dom/src/__tests__/ReactTestUtilsAct-test.js
@@ -30,7 +30,7 @@ describe('ReactTestUtils.act()', () => {
   if (__EXPERIMENTAL__) {
     let concurrentRoot = null;
     const renderConcurrent = (el, dom) => {
-      concurrentRoot = ReactDOM.createRoot(dom);
+      concurrentRoot = ReactDOM.unstable_createRoot(dom);
       concurrentRoot.render(el);
     };
 
@@ -76,7 +76,7 @@ describe('ReactTestUtils.act()', () => {
   if (__EXPERIMENTAL__) {
     let blockingRoot = null;
     const renderBatched = (el, dom) => {
-      blockingRoot = ReactDOM.createBlockingRoot(dom);
+      blockingRoot = ReactDOM.unstable_createBlockingRoot(dom);
       blockingRoot.render(el);
     };
 
@@ -127,7 +127,9 @@ describe('ReactTestUtils.act()', () => {
     // @gate experimental
     it('warns in blocking mode', () => {
       expect(() => {
-        const root = ReactDOM.createBlockingRoot(document.createElement('div'));
+        const root = ReactDOM.unstable_createBlockingRoot(
+          document.createElement('div'),
+        );
         root.render(<App />);
         Scheduler.unstable_flushAll();
       }).toErrorDev([
@@ -138,7 +140,9 @@ describe('ReactTestUtils.act()', () => {
     // @gate experimental
     it('warns in concurrent mode', () => {
       expect(() => {
-        const root = ReactDOM.createRoot(document.createElement('div'));
+        const root = ReactDOM.unstable_createRoot(
+          document.createElement('div'),
+        );
         root.render(<App />);
         Scheduler.unstable_flushAll();
       }).toErrorDev([
diff --git a/packages/react-dom/src/__tests__/ReactUnmockedSchedulerWarning-test.js b/packages/react-dom/src/__tests__/ReactUnmockedSchedulerWarning-test.js
index dc59341312d6..57fc7fdcdc40 100644
--- a/packages/react-dom/src/__tests__/ReactUnmockedSchedulerWarning-test.js
+++ b/packages/react-dom/src/__tests__/ReactUnmockedSchedulerWarning-test.js
@@ -30,7 +30,7 @@ it('does not warn when rendering in legacy mode', () => {
 // @gate experimental
 it('should warn when rendering in concurrent mode', () => {
   expect(() => {
-    ReactDOM.createRoot(document.createElement('div')).render(<App />);
+    ReactDOM.unstable_createRoot(document.createElement('div')).render(<App />);
   }).toErrorDev(
     'In Concurrent or Sync modes, the "scheduler" module needs to be mocked ' +
       'to guarantee consistent behaviour across tests and browsers.',
@@ -38,14 +38,16 @@ it('should warn when rendering in concurrent mode', () => {
   );
   // does not warn twice
   expect(() => {
-    ReactDOM.createRoot(document.createElement('div')).render(<App />);
+    ReactDOM.unstable_createRoot(document.createElement('div')).render(<App />);
   }).toErrorDev([]);
 });
 
 // @gate experimental
 it('should warn when rendering in blocking mode', () => {
   expect(() => {
-    ReactDOM.createBlockingRoot(document.createElement('div')).render(<App />);
+    ReactDOM.unstable_createBlockingRoot(document.createElement('div')).render(
+      <App />,
+    );
   }).toErrorDev(
     'In Concurrent or Sync modes, the "scheduler" module needs to be mocked ' +
       'to guarantee consistent behaviour across tests and browsers.',
@@ -53,6 +55,8 @@ it('should warn when rendering in blocking mode', () => {
   );
   // does not warn twice
   expect(() => {
-    ReactDOM.createBlockingRoot(document.createElement('div')).render(<App />);
+    ReactDOM.unstable_createBlockingRoot(document.createElement('div')).render(
+      <App />,
+    );
   }).toErrorDev([]);
 });
diff --git a/packages/react-dom/src/__tests__/ReactUpdates-test.js b/packages/react-dom/src/__tests__/ReactUpdates-test.js
index 9fc50d0f34b4..7b4af4f928ab 100644
--- a/packages/react-dom/src/__tests__/ReactUpdates-test.js
+++ b/packages/react-dom/src/__tests__/ReactUpdates-test.js
@@ -1319,7 +1319,7 @@ describe('ReactUpdates', () => {
       );
     }
 
-    const root = ReactDOM.createRoot(container);
+    const root = ReactDOM.unstable_createRoot(container);
     let hiddenDiv;
     act(() => {
       root.render(<Foo />);
diff --git a/packages/react-dom/src/events/plugins/__tests__/LegacyChangeEventPlugin-test.js b/packages/react-dom/src/events/plugins/__tests__/LegacyChangeEventPlugin-test.js
index c83cfc454897..5c81747996b1 100644
--- a/packages/react-dom/src/events/plugins/__tests__/LegacyChangeEventPlugin-test.js
+++ b/packages/react-dom/src/events/plugins/__tests__/LegacyChangeEventPlugin-test.js
@@ -479,7 +479,7 @@ describe('ChangeEventPlugin', () => {
 
     // @gate experimental
     it('text input', () => {
-      const root = ReactDOM.createRoot(container);
+      const root = ReactDOM.unstable_createRoot(container);
       let input;
 
       class ControlledInput extends React.Component {
@@ -522,7 +522,7 @@ describe('ChangeEventPlugin', () => {
 
     // @gate experimental
     it('checkbox input', () => {
-      const root = ReactDOM.createRoot(container);
+      const root = ReactDOM.unstable_createRoot(container);
       let input;
 
       class ControlledInput extends React.Component {
@@ -578,7 +578,7 @@ describe('ChangeEventPlugin', () => {
 
     // @gate experimental
     it('textarea', () => {
-      const root = ReactDOM.createRoot(container);
+      const root = ReactDOM.unstable_createRoot(container);
       let textarea;
 
       class ControlledTextarea extends React.Component {
@@ -621,7 +621,7 @@ describe('ChangeEventPlugin', () => {
 
     // @gate experimental
     it('parent of input', () => {
-      const root = ReactDOM.createRoot(container);
+      const root = ReactDOM.unstable_createRoot(container);
       let input;
 
       class ControlledInput extends React.Component {
@@ -668,7 +668,7 @@ describe('ChangeEventPlugin', () => {
 
     // @gate experimental
     it('is async for non-input events', () => {
-      const root = ReactDOM.createRoot(container);
+      const root = ReactDOM.unstable_createRoot(container);
       let input;
 
       class ControlledInput extends React.Component {
@@ -728,7 +728,7 @@ describe('ChangeEventPlugin', () => {
       const {act} = TestUtils;
       const {useState} = React;
 
-      const root = ReactDOM.createRoot(container);
+      const root = ReactDOM.unstable_createRoot(container);
 
       const target = React.createRef(null);
       function Foo() {
diff --git a/packages/react-dom/src/events/plugins/__tests__/LegacySimpleEventPlugin-test.js b/packages/react-dom/src/events/plugins/__tests__/LegacySimpleEventPlugin-test.js
index f01568970325..bcf5e12e0986 100644
--- a/packages/react-dom/src/events/plugins/__tests__/LegacySimpleEventPlugin-test.js
+++ b/packages/react-dom/src/events/plugins/__tests__/LegacySimpleEventPlugin-test.js
@@ -239,7 +239,7 @@ describe('SimpleEventPlugin', function() {
     // @gate experimental
     it('flushes pending interactive work before extracting event handler', () => {
       container = document.createElement('div');
-      const root = ReactDOM.createRoot(container);
+      const root = ReactDOM.unstable_createRoot(container);
       document.body.appendChild(container);
 
       let button;
@@ -310,7 +310,7 @@ describe('SimpleEventPlugin', function() {
     // @gate experimental
     it('end result of many interactive updates is deterministic', () => {
       container = document.createElement('div');
-      const root = ReactDOM.createRoot(container);
+      const root = ReactDOM.unstable_createRoot(container);
       document.body.appendChild(container);
 
       let button;
@@ -409,7 +409,7 @@ describe('SimpleEventPlugin', function() {
       }
 
       // Initial mount
-      const root = ReactDOM.createRoot(container);
+      const root = ReactDOM.unstable_createRoot(container);
       root.render(<Wrapper />);
       expect(Scheduler).toFlushAndYield([
         'High-pri count: 0, Low-pri count: 0',
diff --git a/packages/react-reconciler/src/__tests__/ReactBlocks-test.js b/packages/react-reconciler/src/__tests__/ReactBlocks-test.js
index 56be93864958..06662e63f3eb 100644
--- a/packages/react-reconciler/src/__tests__/ReactBlocks-test.js
+++ b/packages/react-reconciler/src/__tests__/ReactBlocks-test.js
@@ -24,7 +24,7 @@ describe('ReactBlocks', () => {
     React = require('react');
     ReactNoop = require('react-noop-renderer');
 
-    block = React.block;
+    block = React.unstable_block;
     useState = React.useState;
     Suspense = React.Suspense;
     const cache = new Map();
diff --git a/packages/react-reconciler/src/__tests__/ReactHooksWithNoopRenderer-test.js b/packages/react-reconciler/src/__tests__/ReactHooksWithNoopRenderer-test.js
index 5dff2fde2c05..5e34e346466f 100644
--- a/packages/react-reconciler/src/__tests__/ReactHooksWithNoopRenderer-test.js
+++ b/packages/react-reconciler/src/__tests__/ReactHooksWithNoopRenderer-test.js
@@ -63,8 +63,8 @@ describe('ReactHooksWithNoopRenderer', () => {
     useImperativeHandle = React.useImperativeHandle;
     forwardRef = React.forwardRef;
     memo = React.memo;
-    useTransition = React.useTransition;
-    useDeferredValue = React.useDeferredValue;
+    useTransition = React.unstable_useTransition;
+    useDeferredValue = React.unstable_useDeferredValue;
     Suspense = React.Suspense;
     act = ReactNoop.act;
 
diff --git a/packages/react-reconciler/src/__tests__/ReactSuspenseList-test.js b/packages/react-reconciler/src/__tests__/ReactSuspenseList-test.js
index 19cea8e172c9..4df09b53707e 100644
--- a/packages/react-reconciler/src/__tests__/ReactSuspenseList-test.js
+++ b/packages/react-reconciler/src/__tests__/ReactSuspenseList-test.js
@@ -12,7 +12,7 @@ describe('ReactSuspenseList', () => {
     ReactNoop = require('react-noop-renderer');
     Scheduler = require('scheduler');
     Suspense = React.Suspense;
-    SuspenseList = React.SuspenseList;
+    SuspenseList = React.unstable_SuspenseList;
   });
 
   function Text(props) {
diff --git a/packages/react-reconciler/src/__tests__/ReactSuspenseWithNoopRenderer-test.js b/packages/react-reconciler/src/__tests__/ReactSuspenseWithNoopRenderer-test.js
index bf1f1a696ea2..f27ec62ff84e 100644
--- a/packages/react-reconciler/src/__tests__/ReactSuspenseWithNoopRenderer-test.js
+++ b/packages/react-reconciler/src/__tests__/ReactSuspenseWithNoopRenderer-test.js
@@ -2737,7 +2737,9 @@ describe('ReactSuspenseWithNoopRenderer', () => {
 
     function App() {
       const [page, setPage] = React.useState('A');
-      const [startLoading, isLoading] = React.useTransition(SUSPENSE_CONFIG);
+      const [startLoading, isLoading] = React.unstable_useTransition(
+        SUSPENSE_CONFIG,
+      );
       transitionToPage = nextPage => startLoading(() => setPage(nextPage));
       return (
         <Fragment>
@@ -3718,7 +3720,7 @@ describe('ReactSuspenseWithNoopRenderer', () => {
 
   // @gate experimental
   it('regression: ping at high priority causes update to be dropped', async () => {
-    const {useState, useTransition} = React;
+    const {useState, unstable_useTransition: useTransition} = React;
 
     let setTextA;
     function A() {
@@ -3836,10 +3838,10 @@ describe('ReactSuspenseWithNoopRenderer', () => {
     let setTextWithLongTransition;
 
     function App() {
-      const [startShortTransition, isPending1] = React.useTransition({
+      const [startShortTransition, isPending1] = React.unstable_useTransition({
         timeoutMs: 5000,
       });
-      const [startLongTransition, isPending2] = React.useTransition({
+      const [startLongTransition, isPending2] = React.unstable_useTransition({
         timeoutMs: 30000,
       });
       const isPending = isPending1 || isPending2;
diff --git a/packages/react-reconciler/src/__tests__/ReactTransition-test.js b/packages/react-reconciler/src/__tests__/ReactTransition-test.js
index 3970fcaaf2f3..1b25cf7dd187 100644
--- a/packages/react-reconciler/src/__tests__/ReactTransition-test.js
+++ b/packages/react-reconciler/src/__tests__/ReactTransition-test.js
@@ -25,7 +25,7 @@ describe('ReactTransition', () => {
     ReactNoop = require('react-noop-renderer');
     Scheduler = require('scheduler');
     useState = React.useState;
-    useTransition = React.useTransition;
+    useTransition = React.unstable_useTransition;
     Suspense = React.Suspense;
     act = ReactNoop.act;
   });
diff --git a/packages/react-refresh/src/__tests__/ReactFresh-test.js b/packages/react-refresh/src/__tests__/ReactFresh-test.js
index 268bf4d11126..e24ec52c9240 100644
--- a/packages/react-refresh/src/__tests__/ReactFresh-test.js
+++ b/packages/react-refresh/src/__tests__/ReactFresh-test.js
@@ -2424,7 +2424,7 @@ describe('ReactFresh', () => {
         };
       });
 
-      const root = ReactDOM.createRoot(container);
+      const root = ReactDOM.unstable_createRoot(container);
       root.render(<AppV1 offscreen={true} />);
       expect(Scheduler).toFlushAndYieldThrough(['App#layout']);
       const el = container.firstChild;
diff --git a/packages/react-transport-dom-webpack/src/__tests__/ReactFlightDOM-test.js b/packages/react-transport-dom-webpack/src/__tests__/ReactFlightDOM-test.js
index 46f424409c88..72aa615260f2 100644
--- a/packages/react-transport-dom-webpack/src/__tests__/ReactFlightDOM-test.js
+++ b/packages/react-transport-dom-webpack/src/__tests__/ReactFlightDOM-test.js
@@ -183,7 +183,7 @@ describe('ReactFlightDOM', () => {
     const response = ReactTransportDOMClient.createFromReadableStream(readable);
 
     const container = document.createElement('div');
-    const root = ReactDOM.createRoot(container);
+    const root = ReactDOM.unstable_createRoot(container);
     await act(async () => {
       root.render(<App response={response} />);
     });
@@ -222,7 +222,7 @@ describe('ReactFlightDOM', () => {
     const response = ReactTransportDOMClient.createFromReadableStream(readable);
 
     const container = document.createElement('div');
-    const root = ReactDOM.createRoot(container);
+    const root = ReactDOM.unstable_createRoot(container);
     await act(async () => {
       root.render(<App response={response} />);
     });
@@ -259,7 +259,7 @@ describe('ReactFlightDOM', () => {
     const response = ReactTransportDOMClient.createFromReadableStream(readable);
 
     const container = document.createElement('div');
-    const root = ReactDOM.createRoot(container);
+    const root = ReactDOM.unstable_createRoot(container);
     await act(async () => {
       root.render(<App response={response} />);
     });
@@ -418,7 +418,7 @@ describe('ReactFlightDOM', () => {
     const response = ReactTransportDOMClient.createFromReadableStream(readable);
 
     const container = document.createElement('div');
-    const root = ReactDOM.createRoot(container);
+    const root = ReactDOM.unstable_createRoot(container);
     await act(async () => {
       root.render(<ProfilePage response={response} />);
     });
diff --git a/packages/react/index.classic.fb.js b/packages/react/index.classic.fb.js
index 9c94c49fb21c..96f4791d4ff6 100644
--- a/packages/react/index.classic.fb.js
+++ b/packages/react/index.classic.fb.js
@@ -40,11 +40,15 @@ export {
   createFactory,
   // exposeConcurrentModeAPIs
   useTransition,
+  useTransition as unstable_useTransition,
   useDeferredValue,
+  useDeferredValue as unstable_useDeferredValue,
   SuspenseList,
+  SuspenseList as unstable_SuspenseList,
   unstable_withSuspenseConfig,
   // enableBlocksAPI
   block,
+  block as unstable_block,
   // enableDeprecatedFlareAPI
   DEPRECATED_useResponder,
   DEPRECATED_createResponder,
diff --git a/packages/react/index.experimental.js b/packages/react/index.experimental.js
index c2cb40a81574..47f8a1b0e6bc 100644
--- a/packages/react/index.experimental.js
+++ b/packages/react/index.experimental.js
@@ -39,12 +39,12 @@ export {
   __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED,
   createFactory,
   // exposeConcurrentModeAPIs
-  useTransition,
-  useDeferredValue,
-  SuspenseList,
+  useTransition as unstable_useTransition,
+  useDeferredValue as unstable_useDeferredValue,
+  SuspenseList as unstable_SuspenseList,
   unstable_withSuspenseConfig,
   // enableBlocksAPI
-  block,
+  block as unstable_block,
   unstable_useOpaqueIdentifier,
   // enableDebugTracing
   unstable_DebugTracingMode,
diff --git a/packages/react/index.js b/packages/react/index.js
index d3fa1b145ff4..4cd2d761fb6a 100644
--- a/packages/react/index.js
+++ b/packages/react/index.js
@@ -69,10 +69,14 @@ export {
   __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED,
   createFactory,
   useTransition,
+  useTransition as unstable_useTransition,
   useDeferredValue,
+  useDeferredValue as unstable_useDeferredValue,
   SuspenseList,
+  SuspenseList as unstable_SuspenseList,
   unstable_withSuspenseConfig,
   block,
+  block as unstable_block,
   DEPRECATED_useResponder,
   DEPRECATED_createResponder,
   unstable_createFundamental,
diff --git a/packages/react/index.modern.fb.js b/packages/react/index.modern.fb.js
index a162ef330662..b039b25ef436 100644
--- a/packages/react/index.modern.fb.js
+++ b/packages/react/index.modern.fb.js
@@ -39,11 +39,15 @@ export {
   __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED,
   // exposeConcurrentModeAPIs
   useTransition,
+  useTransition as unstable_useTransition,
   useDeferredValue,
+  useDeferredValue as unstable_useDeferredValue,
   SuspenseList,
+  SuspenseList as unstable_SuspenseList,
   unstable_withSuspenseConfig,
   // enableBlocksAPI
   block,
+  block as unstable_block,
   // enableDeprecatedFlareAPI
   DEPRECATED_useResponder,
   DEPRECATED_createResponder,
diff --git a/packages/react/src/__tests__/ReactStrictMode-test.js b/packages/react/src/__tests__/ReactStrictMode-test.js
index a9eecf61277c..55e473f2b60f 100644
--- a/packages/react/src/__tests__/ReactStrictMode-test.js
+++ b/packages/react/src/__tests__/ReactStrictMode-test.js
@@ -398,7 +398,7 @@ describe('Concurrent Mode', () => {
     }
 
     const container = document.createElement('div');
-    const root = ReactDOM.createRoot(container);
+    const root = ReactDOM.unstable_createRoot(container);
     root.render(<AsyncRoot />);
     expect(() => Scheduler.unstable_flushAll()).toErrorDev(
       [
@@ -454,7 +454,7 @@ Please update the following components: AsyncRoot`,
     }
 
     const container = document.createElement('div');
-    const root = ReactDOM.createRoot(container);
+    const root = ReactDOM.unstable_createRoot(container);
     root.render(<AsyncRoot />);
 
     expect(() => {
@@ -533,7 +533,7 @@ Please update the following components: Parent`,
     }
 
     const container = document.createElement('div');
-    const root = ReactDOM.createRoot(container);
+    const root = ReactDOM.unstable_createRoot(container);
     root.render(<AsyncRoot foo={true} />);
     expect(() =>
       Scheduler.unstable_flushAll(),