diff --git a/README.md b/README.md
index af5c833..ad303b5 100644
--- a/README.md
+++ b/README.md
@@ -757,10 +757,10 @@ The following inputs can be used as `step.with` keys:
 
 The following environment variables can be set as `step.env` keys:
 
-| Name                          | Type   | Default | Description                                                                 |
-|-------------------------------|--------|---------|-----------------------------------------------------------------------------|
-| `DOCKERHUB_OIDC_CONNECTIONID` | String |         | Docker Hub OIDC connection ID. Required for Docker Hub OIDC login           |
-| `DOCKERHUB_OIDC_EXPIREIN`     | Number | `300`   | Docker Hub OIDC token lifetime in seconds. Must be between `300` and `3600` |
+| Name                          | Type   | Default | Description                                                                                        |
+|-------------------------------|--------|---------|----------------------------------------------------------------------------------------------------|
+| `DOCKERHUB_OIDC_CONNECTIONID` | String |         | Docker Hub OIDC connection ID. Required for Docker Hub OIDC login                                  |
+| `DOCKERHUB_OIDC_EXPIREIN`     | Number | `300`   | Docker Hub OIDC token lifetime in seconds. Must be between `300` (5 minutes) and `21600` (6 hours) |
 
 ## Contributing
 
diff --git a/__tests__/dockerhub.test.ts b/__tests__/dockerhub.test.ts
index d326780..6345f0d 100644
--- a/__tests__/dockerhub.test.ts
+++ b/__tests__/dockerhub.test.ts
@@ -86,10 +86,10 @@ describe('getOIDCToken', () => {
   });
 
   test('uses custom token expiration', async () => {
-    process.env.DOCKERHUB_OIDC_EXPIREIN = '900';
+    process.env.DOCKERHUB_OIDC_EXPIREIN = '21600';
     await dockerhub.getOIDCToken('docker.io', 'dbowie');
     const body = new URLSearchParams(postSpy.mock.calls[0][1]);
-    expect(body.get('expires_in')).toBe('900');
+    expect(body.get('expires_in')).toBe('21600');
   });
 
   test('uses stage identity host for stage registry', async () => {
@@ -112,9 +112,9 @@ describe('getOIDCToken', () => {
     expect(postSpy).not.toHaveBeenCalled();
   });
 
-  test.each(['not-a-number', '299', '3601'])('validates token expiration %p', async expiresIn => {
+  test.each(['not-a-number', '299', '21601'])('validates token expiration %p', async expiresIn => {
     process.env.DOCKERHUB_OIDC_EXPIREIN = expiresIn;
-    await expect(dockerhub.getOIDCToken('docker.io', 'dbowie')).rejects.toThrow(`Invalid DOCKERHUB_OIDC_EXPIREIN: ${expiresIn}. Must be between 300 and 3600`);
+    await expect(dockerhub.getOIDCToken('docker.io', 'dbowie')).rejects.toThrow(`Invalid DOCKERHUB_OIDC_EXPIREIN: ${expiresIn}. Must be between 300 and 21600`);
     expect(getIDTokenMock).not.toHaveBeenCalled();
     expect(postSpy).not.toHaveBeenCalled();
   });
diff --git a/src/dockerhub.ts b/src/dockerhub.ts
index 0a39ac2..1939bf0 100644
--- a/src/dockerhub.ts
+++ b/src/dockerhub.ts
@@ -15,7 +15,7 @@ interface OIDCTokenResponse {
 const registries = new Set(['', 'docker.io', 'registry-1.docker.io', 'registry-1-stage.docker.io', 'dhi.io']);
 const defaultExpiresIn = 300;
 const minExpiresIn = 300;
-const maxExpiresIn = 3600;
+const maxExpiresIn = 21600;
 const maxRetries = 5;
 
 export const isDockerHubOIDC = (registry: string, password: string): boolean => {