diff --git a/action.yml.erb b/action.yml.erb
index 52736b5..39c72fd 100644
--- a/action.yml.erb
+++ b/action.yml.erb
@@ -17,7 +17,7 @@ inputs:
     default: true
   build_revision:
     description: 'The SHA-1 of the git commit for which the build is running. Default to GITHUB_SHA.'
-    required: true
+    required: false
     default: ${{ github.sha }}
   verbose:
     description: 'Verbose output'