diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 5a81642..257d23a 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -39,15 +39,6 @@ jobs:
     - name: Create archive
       run: zip -j "intro-skipper-v${{ env.NEW_FILE_VERSION }}.zip" ConfusedPolarBear.Plugin.IntroSkipper/bin/Debug/net8.0/ConfusedPolarBear.Plugin.IntroSkipper.dll
       
-    - name: Generate manifest keys
-      run: |
-        sourceUrl="https://github.com/${{ github.repository }}/releases/download/10.9/v${{ env.NEW_FILE_VERSION }}/intro-skipper-v${{ env.NEW_FILE_VERSION }}.zip"
-        echo "SOURCE_URL=$sourceUrl" >> $GITHUB_ENV
-        md5sum intro-skipper-v${{ env.NEW_FILE_VERSION }}.zip > intro-skipper-v${{ env.NEW_FILE_VERSION }}.md5
-        checksum="$(awk '{print $1}' intro-skipper-v${{ env.NEW_FILE_VERSION }}.md5)"
-        echo "CHECKSUM=$checksum" >> $GITHUB_ENV
-        timestamp="$(date +%FT%TZ)"
-        echo "TIMESTAMP=$timestamp" >> $GITHUB_ENV
 
     - name: Create new release with tag
       if: github.event_name != 'pull_request'
@@ -59,6 +50,7 @@ jobs:
       run: node validate-and-update-manifest.js
       env:
         VERSION: ${{ env.NEW_FILE_VERSION }}
+        GITHUB_REPOSITORY: ${{ github.repository }}
 
     - name: Commit changes
       if: success()
diff --git a/validate-and-update-manifest.js b/validate-and-update-manifest.js
index 27f09dc..002d809 100644
--- a/validate-and-update-manifest.js
+++ b/validate-and-update-manifest.js
@@ -3,6 +3,10 @@ const crypto = require('crypto');
 const fs = require('fs');
 const { URL } = require('url');
 
+const repository = process.env.GITHUB_REPOSITORY;
+const version = process.env.VERSION;
+const targetAbi = "10.9.9.0";
+
 // Read manifest.json
 const manifestPath = './manifest.json';
 if (!fs.existsSync(manifestPath)) {
@@ -12,12 +16,12 @@ if (!fs.existsSync(manifestPath)) {
 const jsonData = JSON.parse(fs.readFileSync(manifestPath, 'utf8'));
 
 const newVersion = {
-    version: process.env.VERSION, // replace with the actual new version
-    changelog: "- See the full changelog at [GitHub](https://github.com/jumoog/intro-skipper/blob/master/CHANGELOG.md)\n",
-    targetAbi: "10.9.9.0",
-    sourceUrl: process.env.SOURCE_URL,
-    checksum: process.env.CHECKSUM,
-    timestamp: process.env.TIMESTAMP
+    version,
+    changelog: `- See the full changelog at [GitHub](https://github.com/${repository}/blob/master/CHANGELOG.md)\n`,
+    targetAbi,
+    sourceUrl: `https://github.com/${repository}/releases/download/10.9/v${version}/intro-skipper-v${version}.zip`,
+    checksum: getMD5FromFile(),
+    timestamp: new Date().toISOString().replace(/\.\d{3}Z$/, 'Z')
 };
 
 async function updateManifest() {
@@ -101,6 +105,11 @@ async function downloadAndHashFile(url, redirects = 5) {
     });
 }
 
+function getMD5FromFile() {
+    const fileBuffer = fs.readFileSync(`intro-skipper-v${version}.zip`);
+    return crypto.createHash('md5').update(fileBuffer).digest('hex');
+}
+
 async function run() {
     await updateManifest();
 }