diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 3774a2c..bb0ce08 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -12,7 +12,7 @@ on:
 
 jobs:
   build:
-    runs-on: ${{ matrix.os }}
+    runs-on: ubuntu-20.04
     strategy:
       fail-fast: false
       matrix: