diff --git a/dist/index.js b/dist/index.js
index ce67462..b132ea9 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -46753,6 +46753,7 @@ var require_github2 = __commonJS({
     exports2.createPRComment = createPRComment;
     exports2.updateComment = updateComment;
     exports2.isPullRequest = isPullRequest;
+    exports2.isPullRequestFromFork = isPullRequestFromFork;
     exports2.getSourceBranch = getSourceBranch;
     exports2.createBranchIfNotExists = createBranchIfNotExists;
     var github_12 = require_github();
@@ -46887,6 +46888,10 @@ var require_github2 = __commonJS({
     function isPullRequest() {
       return github_12.context.eventName === "pull_request";
     }
+    function isPullRequestFromFork() {
+      var _a, _b;
+      return isPullRequest() && ((_b = (_a = github_12.context.payload.pull_request) === null || _a === void 0 ? void 0 : _a.head.repo) === null || _b === void 0 ? void 0 : _b.fork) === true;
+    }
     function getSourceBranch() {
       if (isPullRequest()) {
         return process.env.GITHUB_HEAD_REF;
@@ -49110,18 +49115,19 @@ function checkChangedFiles(octokit, clBinary) {
 function main() {
   return __awaiter(this, void 0, void 0, function* () {
     console.log(`Code Limit action, version: ${version_1.version.revision}`);
-    console.log(JSON.stringify(github_1.context));
     let exitCode = 0;
     const clBinary = yield (0, codelimit_1.downloadCodeLimitBinary)();
     console.log("Scanning codebase...");
     yield (0, exec_1.exec)(clBinary, ["scan", "."]);
     const markdownReport = yield generateMarkdownReport(clBinary);
     const octokit = new action_1.Octokit({ auth: (0, core_1.getInput)("token") });
-    yield updateReportsBranch(octokit, markdownReport);
     const doCheck = (0, core_1.getInput)("check") || true;
     if (doCheck) {
       exitCode = yield checkChangedFiles(octokit, clBinary);
     }
+    if (!(0, github_2.isPullRequestFromFork)()) {
+      yield updateReportsBranch(octokit, markdownReport);
+    }
     fs_1.default.unlinkSync(clBinary);
     console.log("Done!");
     process.exit(exitCode);
diff --git a/src/action.ts b/src/action.ts
index c85dac3..a1b1cb5 100644
--- a/src/action.ts
+++ b/src/action.ts
@@ -9,7 +9,7 @@ import {
     getRepoName,
     getRepoOwner,
     getSourceBranch,
-    isPullRequest, updateComment
+    isPullRequest, isPullRequestFromFork, updateComment
 } from "./github";
 import {exec, getExecOutput} from "@actions/exec";
 import {downloadCodeLimitBinary, getBadgeContent, getReportContent} from "./codelimit";
@@ -82,18 +82,19 @@ async function checkChangedFiles(octokit: Octokit, clBinary: string): Promise<nu
 
 async function main() {
     console.log(`Code Limit action, version: ${version.revision}`);
-    console.log(JSON.stringify(context));
     let exitCode = 0;
     const clBinary = await downloadCodeLimitBinary();
     console.log('Scanning codebase...');
     await exec(clBinary, ['scan', '.']);
     const markdownReport = await generateMarkdownReport(clBinary);
     const octokit = new Octokit({auth: getInput('token')});
-    await updateReportsBranch(octokit, markdownReport);
     const doCheck = getInput('check') || true;
     if (doCheck) {
         exitCode = await checkChangedFiles(octokit, clBinary);
     }
+    if (!isPullRequestFromFork()) {
+        await updateReportsBranch(octokit, markdownReport);
+    }
     fs.unlinkSync(clBinary);
     console.log('Done!');
     process.exit(exitCode);
diff --git a/src/github.ts b/src/github.ts
index 6b96119..449ab53 100644
--- a/src/github.ts
+++ b/src/github.ts
@@ -121,6 +121,10 @@ export function isPullRequest() {
     return context.eventName === 'pull_request';
 }
 
+export function isPullRequestFromFork() {
+    return isPullRequest() && context.payload.pull_request?.head.repo?.fork === true;
+}
+
 export function getSourceBranch() {
     if (isPullRequest()) {
         return process.env.GITHUB_HEAD_REF;