diff --git a/.github/workflows/ccpp.yml b/.github/workflows/ccpp.yml
index 5ed1f294..092dd76e 100644
--- a/.github/workflows/ccpp.yml
+++ b/.github/workflows/ccpp.yml
@@ -5,8 +5,8 @@ on: [push]
 jobs:
   build:
 
-    runs-on: ubuntu-latest
-    
+    runs-on: ubuntu-20.04
+
     steps:
     - uses: actions/checkout@v1