diff --git a/.github/workflows/expat_config_h.yml b/.github/workflows/expat_config_h.yml
index 0054cb72..ddc75364 100644
--- a/.github/workflows/expat_config_h.yml
+++ b/.github/workflows/expat_config_h.yml
@@ -38,7 +38,7 @@ on:
 jobs:
   checks:
     name: Check expat_config.h.{in,cmake} for regressions
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
     - uses: actions/checkout@v3.0.2
     - name: Check expat_config.h.{in,cmake} for regressions