diff --git a/.github/workflows/elixir.yml b/.github/workflows/elixir.yml
index ac08c6a..eb3d1a4 100644
--- a/.github/workflows/elixir.yml
+++ b/.github/workflows/elixir.yml
@@ -9,6 +9,9 @@ on:
 permissions:
   contents: read
 
+env:
+  ImageOs: ubuntu20
+
 jobs:
   build: