diff --git a/.github/workflows/fly-deploy.yml b/.github/workflows/fly-deploy.yml
index 328b9e6..9dae31c 100644
--- a/.github/workflows/fly-deploy.yml
+++ b/.github/workflows/fly-deploy.yml
@@ -14,6 +14,6 @@ jobs:
       - uses: superfly/flyctl-actions/setup-flyctl@master
       
       - name: Deploy to Fly.io
-        run: flyctl deploy --local-only --build-arg NPM_TOKEN=${{ secrets.GH_NPM_TOKEN }}
+        run: flyctl deploy --local-only --build-secret NPM_TOKEN=${{ secrets.GH_NPM_TOKEN }}
         env:
           FLY_API_TOKEN: ${{ secrets.FLY_API_TOKEN }}
\ No newline at end of file