diff --git a/.github/workflows/sync-end-to-end.yml b/.github/workflows/sync-end-to-end.yml
index ebe4d1463e..5f1527de3e 100644
--- a/.github/workflows/sync-end-to-end.yml
+++ b/.github/workflows/sync-end-to-end.yml
@@ -70,7 +70,7 @@ jobs:
     strategy:
       matrix:
         os-version: [15, 16, 17]
-      #max-parallel: 1 # Uncomment this line to run tests sequentially. 
+      max-parallel: 1 # Uncomment this line to run tests sequentially. 
       fail-fast: false
     
     steps: