diff --git a/.github/workflows/Test_installation_assistant.yml b/.github/workflows/Test_installation_assistant.yml
index 386b7f5..223fb09 100644
--- a/.github/workflows/Test_installation_assistant.yml
+++ b/.github/workflows/Test_installation_assistant.yml
@@ -61,7 +61,7 @@ permissions:
 
 jobs:
   initialize-environment:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
 
     steps:
     - name: Checkout code