diff --git a/.github/workflows/check_acpype.yml b/.github/workflows/check_acpype.yml
index f5178167..48e9aa43 100644
--- a/.github/workflows/check_acpype.yml
+++ b/.github/workflows/check_acpype.yml
@@ -15,7 +15,7 @@ on:
 
 jobs:
   check-test:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     strategy:
       matrix:
         python-version: ["3.7", "3.8", "3.9", "3.10", "3.11"]
@@ -86,7 +86,7 @@ jobs:
 
   release:
     needs: check-test
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - name: Get current date
         id: date