diff --git a/.github/workflows/iac.yml b/.github/workflows/iac.yml
index 3dd7c1a9..10c94b70 100644
--- a/.github/workflows/iac.yml
+++ b/.github/workflows/iac.yml
@@ -52,6 +52,7 @@ on:
       RUNNER:
         required: true
         type: string
+        default: ubuntu-latest
     secrets:
       AWS_ACCESS_KEY_ID:
         required: true