diff --git a/.github/workflows/build-tests.yml b/.github/workflows/build-tests.yml
index 1d8a38d6..e45e2e7f 100644
--- a/.github/workflows/build-tests.yml
+++ b/.github/workflows/build-tests.yml
@@ -121,6 +121,7 @@ jobs:
         env:
           UNITY_EMAIL: ${{ secrets.UNITY_EMAIL }}
           UNITY_PASSWORD: ${{ secrets.UNITY_PASSWORD }}
+          UNITY_SERIAL: ${{ secrets.UNITY_SERIAL }}
         with:
           projectPath: ${{ matrix.projectPath }}
           unityVersion: ${{ matrix.unityVersion }}