diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 742d137ae..983369ddb 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -6,7 +6,7 @@ env:
   CCACHE_DIR: ${{ github.workspace }}/.ccache"
 jobs:
   build_and_test:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v2
       - name: install dependencies