diff --git a/CHANGELOG.md b/CHANGELOG.md
index 970b77c44bef..b727c351c0a6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -75,6 +75,7 @@
 - `[@jest/expect-utils]` Fix not addressing to Sets and Maps as objects without keys ([#14873](https://github.com/jestjs/jest/pull/14873))
 - `[jest-leak-detector]` Make leak-detector more aggressive when running GC ([#14526](https://github.com/jestjs/jest/pull/14526))
 - `[jest-runtime]` Properly handle re-exported native modules in ESM via CJS ([#14589](https://github.com/jestjs/jest/pull/14589))
+- `[jest-schemas, jest-types]` [**BREAKING**] Fix type of `testFailureExitCode` config option([#15232](https://github.com/jestjs/jest/pull/15232))
 - `[jest-util]` Make sure `isInteractive` works in a browser ([#14552](https://github.com/jestjs/jest/pull/14552))
 - `[pretty-format]` [**BREAKING**] Print `ArrayBuffer` and `DataView` correctly ([#14290](https://github.com/jestjs/jest/pull/14290))
 - `[pretty-format]` Fixed a bug where "anonymous custom elements" were not being printed as expected. ([#15138](https://github.com/jestjs/jest/pull/15138))
diff --git a/packages/jest-schemas/src/raw-types.ts b/packages/jest-schemas/src/raw-types.ts
index f340582fc106..be58048ff0f8 100644
--- a/packages/jest-schemas/src/raw-types.ts
+++ b/packages/jest-schemas/src/raw-types.ts
@@ -321,7 +321,7 @@ export const RawInitialOptions = Type.Partial(
     errorOnDeprecated: Type.Boolean(),
     testEnvironment: Type.String(),
     testEnvironmentOptions: Type.Record(Type.String(), Type.Unknown()),
-    testFailureExitCode: Type.Union([Type.String(), Type.Integer()]),
+    testFailureExitCode: Type.Integer(),
     testLocationInResults: Type.Boolean(),
     testMatch: Type.Array(Type.String()),
     testNamePattern: Type.String(),
diff --git a/packages/jest-types/src/Config.ts b/packages/jest-types/src/Config.ts
index f4ff9f9ab3db..debea999ed27 100644
--- a/packages/jest-types/src/Config.ts
+++ b/packages/jest-types/src/Config.ts
@@ -198,7 +198,7 @@ export type DefaultOptions = {
   snapshotSerializers: Array<string>;
   testEnvironment: string;
   testEnvironmentOptions: Record<string, unknown>;
-  testFailureExitCode: string | number;
+  testFailureExitCode: number;
   testLocationInResults: boolean;
   testMatch: Array<string>;
   testPathIgnorePatterns: Array<string>;