diff --git a/.github/workflows/push.yml b/.github/workflows/push.yml
index fe3a24b..8ee3631 100644
--- a/.github/workflows/push.yml
+++ b/.github/workflows/push.yml
@@ -4,7 +4,7 @@ on: [push, pull_request]
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-18.04
 
     steps:
       - uses: actions/checkout@v2