diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index f56ab7a977..9fc3b96a20 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -22,7 +22,7 @@ jobs:
   build:
     strategy:
       matrix:
-        os: [ ubuntu-latest, windows-latest, macos-latest ]
+        os: [ ubuntu-20.04, windows-latest, macos-latest ]
       fail-fast: false
     runs-on: ${{ matrix.os }}