diff --git a/.github/workflows/bats-test.yml b/.github/workflows/bats-test.yml
index 71f9d51..8090668 100644
--- a/.github/workflows/bats-test.yml
+++ b/.github/workflows/bats-test.yml
@@ -11,7 +11,7 @@ on:
 
 jobs:
   test:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-18.04 # Test on old version bash
     steps:
     - name: Setup BATS
       uses: mig4/setup-bats@v1