diff --git a/.github/workflows/iriscast_package_build.yaml b/.github/workflows/iriscast_package_build.yaml
index 088b7323..e551ea85 100644
--- a/.github/workflows/iriscast_package_build.yaml
+++ b/.github/workflows/iriscast_package_build.yaml
@@ -11,7 +11,7 @@ on:
 
 jobs:
   test_and_lint:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-20.04
     strategy:
       matrix:
         python-version: ["3.x", "3.10", "3.6.8"]
@@ -36,7 +36,7 @@ jobs:
           cd iriscasttools && pylint --recursive yes test iriscasttools
 
   build-wheel:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-20.04
     strategy:
       matrix:
         python-version: ["3.x"]
@@ -64,7 +64,7 @@ jobs:
           if-no-files-found: error
 
   build-rpms:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-20.04
     strategy:
       matrix:
         python-version: ["3.x", "3.10", "3.6.8"]
@@ -96,7 +96,7 @@ jobs:
           if-no-files-found: error
   
   publish:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-20.04
     if: github.ref == 'refs/heads/master' && github.event_name == 'push'
     needs:
       - test_and_lint