diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index 007784c..f5550c6 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -9,20 +9,27 @@ jobs:
   deploy:
     name: deploy-gcf
     runs-on: ubuntu-latest
+
     steps:
-      - uses: actions/checkout@v4
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - id: 'auth'
+        uses: google-github-actions/auth@v2
+        with:
+          credentials_json: '${{ secrets.SERVICE_ACCOUNT_KEY }}'
+
       - name: Set up Cloud SDK
         uses: google-github-actions/setup-gcloud@v2
         with:
           # probot/example-google-cloud-function credentials provided by @bcoe
           project_id: ${{ secrets.PROJECT_ID }}
-          service_account_key: ${{ secrets.SERVICE_ACCOUNT_KEY }}
-          export_default_credentials: true
+
       - name: Deploy to GCF
         run: |
           gcloud functions deploy example-google-cloud-function \
-            --runtime nodejs12 \
+            --runtime=nodejs20 \
             --allow-unauthenticated \
             --trigger-http \
-            --entry-point probotApp \
+            --entry-point=probotApp \
             --set-env-vars APP_ID="${{secrets.APP_ID}}",PRIVATE_KEY="${{secrets.PRIVATE_KEY}}",WEBHOOK_SECRET="${{secrets.WEBHOOK_SECRET}}"
diff --git a/function.js b/function.js
index 0ddf609..8ad0acd 100644
--- a/function.js
+++ b/function.js
@@ -1,4 +1,17 @@
-const { createNodeMiddleware, createProbot } = require("probot");
-const app = require("./app");
+// Use CommonJS syntax for compatibility with Node.js.
+const { createNodeMiddleware, Probot } = require("probot");
+// Import the Probot app function.
+const appFn = require("./app.js");
 
-exports.probotApp = createNodeMiddleware(app, { probot: createProbot(), webhooksPath: "/" });
+// Initialize Probot with environment variables.
+const probot = new Probot({
+  appId: process.env.APP_ID,
+  privateKey: process.env.PRIVATE_KEY?.replace(/\\n/g, '\n'), // Fix newlines in RSA keys
+  secret: process.env.WEBHOOK_SECRET,
+});
+
+// This exports the Probot app as middleware for use in a serverless environment.
+module.exports.probotApp = createNodeMiddleware(appFn, {
+  probot: probot,
+  webhooksPath: "/",
+});