diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index ecf87d2..96ca60d 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -12,7 +12,7 @@ on:
 jobs:
   # Build for pyodide 0.21.0
   Pyodide_test_and_build:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
     - uses: actions/checkout@v3
     - uses: actions/setup-python@v4