diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 704d29c..4fd5764 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -4,7 +4,7 @@ on:
     branches: [ master ]
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: Ubuntu-20.04
 
     steps:
     - uses: actions/checkout@v2