diff --git a/CHANGELOG.md b/CHANGELOG.md
index 89c2f94770bf..42be1dcc2414 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,7 @@
 - [react] feat: Add instrumentation for React Router v3 (#2759)
 - [apm/tracing] fix: Make sure fetch requests are being timed correctly (#2772)
 - [apm/tracing] fix: Make sure pageload transactions start timestamps are correctly generated (#2773)
+- [react] ref: Use inline types to avoid redux dependency. (#2768)
 
 ## 5.20.0
 
diff --git a/packages/react/src/redux.ts b/packages/react/src/redux.ts
index 8fa1547f84b6..195953c3fdc5 100644
--- a/packages/react/src/redux.ts
+++ b/packages/react/src/redux.ts
@@ -1,7 +1,52 @@
 // @flow
 import { configureScope } from '@sentry/minimal';
 import { Scope } from '@sentry/types';
-import { Action, AnyAction, PreloadedState, Reducer, StoreEnhancer, StoreEnhancerStoreCreator } from 'redux';
+
+interface Action<T = any> {
+  type: T;
+}
+
+interface AnyAction extends Action {
+  [extraProps: string]: any;
+}
+
+type Reducer<S = any, A extends Action = AnyAction> = (state: S | undefined, action: A) => S;
+
+type Dispatch<A extends Action = AnyAction> = <T extends A>(action: T, ...extraArgs: any[]) => T;
+
+type ExtendState<State, Extension> = [Extension] extends [never] ? State : State & Extension;
+
+type Unsubscribe = () => void;
+
+interface Store<S = any, A extends Action = AnyAction, StateExt = never, Ext = {}> {
+  dispatch: Dispatch<A>;
+  getState(): S;
+  subscribe(listener: () => void): Unsubscribe;
+  replaceReducer<NewState, NewActions extends Action>(
+    nextReducer: Reducer<NewState, NewActions>,
+  ): Store<ExtendState<NewState, StateExt>, NewActions, StateExt, Ext> & Ext;
+}
+
+declare const $CombinedState: unique symbol;
+
+type CombinedState<S> = { readonly [$CombinedState]?: undefined } & S;
+
+type PreloadedState<S> = Required<S> extends {
+  [$CombinedState]: undefined;
+}
+  ? S extends CombinedState<infer S1>
+    ? { [K in keyof S1]?: S1[K] extends object ? PreloadedState<S1[K]> : S1[K] }
+    : never
+  : { [K in keyof S]: S[K] extends string | number | boolean | symbol ? S[K] : PreloadedState<S[K]> };
+
+type StoreEnhancer<Ext = {}, StateExt = never> = (
+  next: StoreEnhancerStoreCreator<Ext, StateExt>,
+) => StoreEnhancerStoreCreator<Ext, StateExt>;
+
+type StoreEnhancerStoreCreator<Ext = {}, StateExt = never> = <S = any, A extends Action = AnyAction>(
+  reducer: Reducer<S, A>,
+  preloadedState?: PreloadedState<S>,
+) => Store<ExtendState<S, StateExt>, A, StateExt, Ext> & Ext;
 
 export interface SentryEnhancerOptions {
   /**
@@ -9,7 +54,7 @@ export interface SentryEnhancerOptions {
    * Use this to remove any private data before sending it to Sentry.
    * Return null to not attach the state.
    */
-  stateTransformer(state: any | undefined): any | null;
+  stateTransformer<S>(state: S | undefined): (S & any) | null;
   /**
    * Transforms the action before sending it as a breadcrumb.
    * Use this to remove any private data before sending it to Sentry.
@@ -19,7 +64,7 @@ export interface SentryEnhancerOptions {
   /**
    * Called on every state update, configure the Sentry Scope with the redux state.
    */
-  configureScopeWithState?(scope: Scope, state: any): void;
+  configureScopeWithState?<S>(scope: Scope, state: S): void;
 }
 
 const ACTION_BREADCRUMB_CATEGORY = 'redux.action';
@@ -29,9 +74,14 @@ const STATE_CONTEXT_KEY = 'redux.state';
 const defaultOptions: SentryEnhancerOptions = {
   actionTransformer: action => action,
   // tslint:disable-next-line: no-unsafe-any
-  stateTransformer: state => state,
+  stateTransformer: state => state || null,
 };
 
+/**
+ * Creates an enhancer that would be passed to Redux's createStore to log actions and the latest state to Sentry.
+ *
+ * @param enhancerOptions Options to pass to the enhancer
+ */
 function createReduxEnhancer(enhancerOptions?: Partial<SentryEnhancerOptions>): StoreEnhancer {
   const options = {
     ...defaultOptions,
@@ -59,6 +109,7 @@ function createReduxEnhancer(enhancerOptions?: Partial<SentryEnhancerOptions>):
 
         /* Set latest state to scope */
         const transformedState = options.stateTransformer(newState);
+        // tslint:disable-next-line: strict-type-predicates
         if (typeof transformedState !== 'undefined' && transformedState !== null) {
           // tslint:disable-next-line: no-unsafe-any
           scope.setContext(STATE_CONTEXT_KEY, transformedState);