diff --git a/.github/workflows/checks.yml b/.github/workflows/checks.yml
index 3fd74bd..38f5380 100644
--- a/.github/workflows/checks.yml
+++ b/.github/workflows/checks.yml
@@ -6,10 +6,9 @@ on:
 
 jobs:
   test:
-    runs-on: ${{ matrix.os }}
+    runs-on: ubuntu-20.04
     strategy:
       matrix:
-        os: [ubuntu-20.04, windows-latest, macos-latest]
         python-version: ["3.10", "3.11", "3.12"]
     steps:
       - uses: actions/checkout@v4