diff --git a/.github/workflows/ubuntu.yml b/.github/workflows/ubuntu.yml
index d87b377..cc240f6 100644
--- a/.github/workflows/ubuntu.yml
+++ b/.github/workflows/ubuntu.yml
@@ -41,7 +41,7 @@ jobs:
 
 
   Clang:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     strategy:
       matrix:
         build_type: [Debug, RelWithDebInfo, MinSizeRel, Release]