diff --git a/.github/workflows/cpp.yml b/.github/workflows/cpp.yml
index 2df433a..5833c00 100644
--- a/.github/workflows/cpp.yml
+++ b/.github/workflows/cpp.yml
@@ -5,7 +5,7 @@ on: [push]
 jobs:
   build_linux:
 
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     
     steps:
     - name: Clone source