diff --git a/.github/workflows/clean.yml b/.github/workflows/clean.yml
index 6bbf07761..a2c4f39d7 100644
--- a/.github/workflows/clean.yml
+++ b/.github/workflows/clean.yml
@@ -165,7 +165,7 @@ jobs:
             # zm,
             # unsorted
           ]
-      max-parallel: 2
+      max-parallel: 1
     steps:
       - name: Create Branch
         uses: peterjgrainger/action-create-branch@v2.0.1