diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index b09c2c0a..1ce4bf8c 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -13,7 +13,7 @@ on:
           - minor
       proto_version:
         description: Version of isolate-proto to use. Empty means latest.
-        required: true
+        required: false
         default: ""
         type: string