diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 12e6136..ceef185 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -7,7 +7,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, windows-latest]
+        os: [ubuntu-20.04, windows-latest]
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v4