diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 43586c262a..f2b63e9967 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -20,7 +20,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest, macos-latest]
+        os: [ubuntu-20.04, macos-latest]
 
     steps:
       - uses: actions/checkout@v2