diff --git a/action.yml b/action.yml
index 690d661..0a8ae0b 100644
--- a/action.yml
+++ b/action.yml
@@ -87,6 +87,7 @@ inputs:
   monorepo-tags:
     description: 'add prefix to tags and branches, allowing multiple libraries to be released from the same repository'
     required: false
+    default: false
   pull-request-title-pattern:
     description: 'add title pattern to make release PR, defaults to using "chore${scope}: release${component} ${version}"'
     required: false