diff --git a/.github/workflows/check-pull-request.yaml b/.github/workflows/check-pull-request.yaml
index c744f73b..5bfedaf4 100644
--- a/.github/workflows/check-pull-request.yaml
+++ b/.github/workflows/check-pull-request.yaml
@@ -53,7 +53,7 @@ jobs:
 
   lint:
     name: Lint
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
     - name: Checkout the source
       uses: actions/checkout@v2