diff --git a/action.yml b/action.yml
index 52bff61..8830547 100644
--- a/action.yml
+++ b/action.yml
@@ -27,7 +27,7 @@ inputs:
     required: false
   firebaseServiceAccount:
     description: "Firebase service account JSON"
-    required: true
+    required: false
   expires:
     description: "How long should a preview live? See the preview channels docs for options"
     default: "7d"