diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 4c00208..00db5bb 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -69,5 +69,5 @@ We are using [Playwright](https://playwright.dev) for end-to-end testing.
 
 The tests can be run like this:
 1. Start the backend normally
-2. Start the frontend in production mode with `npm run build && node build/index.js`
+2. Start the frontend in production mode with `npm run build && node --env-file=.env build/index.js`
 3. Run the tests with `npm run test`
diff --git a/docs/docs/setup/upgrading.md b/docs/docs/setup/upgrading.md
index 283c5d1..3383fd5 100644
--- a/docs/docs/setup/upgrading.md
+++ b/docs/docs/setup/upgrading.md
@@ -37,7 +37,7 @@ docker compose up -d
    cd ../frontend
    npm install
    npm run build
-   pm2 start build/index.js --name pocket-id-frontend
+   pm2 start --name pocket-id-frontend --node-args="--env-file .env" build/index.js
 
    # Optional: Start Caddy (You can use any other reverse proxy)
    cd ..