diff --git a/src/create-installation-access-token.ts b/src/create-installation-access-token.ts
index 2054fad..9c72a9a 100644
--- a/src/create-installation-access-token.ts
+++ b/src/create-installation-access-token.ts
@@ -23,7 +23,9 @@ export const createInstallationAccessToken = async ({
   permissions,
   privateKey,
   repositories,
-}: InstallationAccessTokenCreationOptions): Promise<string> => {
+}: InstallationAccessTokenCreationOptions): Promise<{
+  [s: string]: string;
+}> => {
   try {
     const app = createAppAuth({
       appId,
@@ -45,12 +47,12 @@ export const createInstallationAccessToken = async ({
     );
 
     const {
-      data: { token },
+      data: { token, expires_at },
     } = await octokit.request(
       "POST /app/installations/{installation_id}/access_tokens",
       { installation_id: installationId, permissions, repositories },
     );
-    return token;
+    return { token: token, expiration: expires_at };
   } catch (error: unknown) {
     throw new Error("Could not create installation access token.", {
       cause: error,
diff --git a/src/main.ts b/src/main.ts
index 9a0f7f2..890d411 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -3,13 +3,14 @@ import { info, saveState, setOutput, setSecret } from "@actions/core";
 import { createInstallationAccessToken } from "./create-installation-access-token.js";
 import { parseOptions } from "./parse-options.js";
 import { run } from "./run.js";
-import { tokenKey } from "./state.js";
+import { expirationKey, tokenKey } from "./state.js";
 
 await run(async () => {
   const options = parseOptions();
-  const token = await createInstallationAccessToken(options);
+  const { token, expiration } = await createInstallationAccessToken(options);
   setSecret(token);
   saveState(tokenKey, token);
+  saveState(expirationKey, expiration);
   setOutput("token", token);
   info("Token created successfully");
 });
diff --git a/src/post.ts b/src/post.ts
index 0d2680e..a30dca3 100644
--- a/src/post.ts
+++ b/src/post.ts
@@ -2,7 +2,7 @@ import { getInput, getState, info } from "@actions/core";
 
 import { revokeInstallationAccessToken } from "./revoke-installation-access-token.js";
 import { run } from "./run.js";
-import { tokenKey } from "./state.js";
+import { expirationKey, tokenKey } from "./state.js";
 
 await run(async () => {
   if (!JSON.parse(getInput("revoke"))) {
@@ -15,6 +15,15 @@ await run(async () => {
     info("No token to revoke");
     return;
   }
+
+  // if expiration is before now, then the token already expired and there's no need to revoke it
+  const expiration = getState(expirationKey);
+  const now = Date.now();
+  const expirationTime = Date.parse(expiration);
+  if (expirationTime < now) {
+    info("Token is already expired, no need to revoke it");
+    return;
+  }
   await revokeInstallationAccessToken(token);
   info("Token revoked successfully");
 });
diff --git a/src/state.ts b/src/state.ts
index ddd1ef3..64075f7 100644
--- a/src/state.ts
+++ b/src/state.ts
@@ -1 +1,2 @@
 export const tokenKey = "token";
+export const expirationKey = "expires_at";