diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f6dd56ae40..7f3da5fe92 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -62,7 +62,7 @@ jobs:
 
   # Run the C integration tests.
   c-tests:
-    uses: lf-lang/lingua-franca/.github/workflows/c-tests.yml@master
+    uses: lf-lang/lingua-franca/.github/workflows/c-tests.yml@auth-fail-test
     needs: cancel
   
   # Run the C Arduino integration tests.