diff --git a/.github/workflows/test_codespaces_install.yml b/.github/workflows/test_codespaces_install.yml
index 05aebd9..ab42633 100644
--- a/.github/workflows/test_codespaces_install.yml
+++ b/.github/workflows/test_codespaces_install.yml
@@ -10,7 +10,7 @@ on:
 jobs:
   install_codespaces_setup:
     name: install codespaces setup
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v1
       - run: bash install.sh