diff --git a/.github/workflows/aunit.yml b/.github/workflows/aunit.yml
index d5fc357..80e9978 100644
--- a/.github/workflows/aunit.yml
+++ b/.github/workflows/aunit.yml
@@ -9,7 +9,7 @@ on: [push]
 jobs:
   build:
 
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
 
     steps:
     - uses: actions/checkout@v2