diff --git a/packages/expect/src/__tests__/customEqualityTesters.test.ts b/packages/expect/src/__tests__/customEqualityTesters.test.ts
index 48d331d79bd4..8699acde7855 100644
--- a/packages/expect/src/__tests__/customEqualityTesters.test.ts
+++ b/packages/expect/src/__tests__/customEqualityTesters.test.ts
@@ -201,7 +201,7 @@ describe('with custom equality testers', () => {
   });
 
   it('spy matchers pass different special objects', () => {
-    const mockFn: (...args: Array<any>) => any = jest.fn(() => specialReturn1);
+    const mockFn = jest.fn<(...args: Array<unknown>) => unknown>(() => specialReturn1);
     mockFn(...testArgs);
 
     expect(mockFn).toHaveBeenCalledWith(...expectedArgs);