diff --git a/.github/workflows/ci_pr.yml b/.github/workflows/ci_pr.yml
index 3e0efce..562ce85 100644
--- a/.github/workflows/ci_pr.yml
+++ b/.github/workflows/ci_pr.yml
@@ -22,6 +22,7 @@ jobs:
       - name: Install dependencies
         run: |
           pip install "poetry~=1.6.1"
+          poetry config installer.max-workers 1 # fix ChefBuildError
           poetry config virtualenvs.in-project true
 
       - name: Cache the virtualenv