diff --git a/.github/workflows/publish_release.yml b/.github/workflows/publish_release.yml
index 1944b5ba..1bb37391 100644
--- a/.github/workflows/publish_release.yml
+++ b/.github/workflows/publish_release.yml
@@ -14,13 +14,13 @@ on:
         required: true
       swift_format_version:
         type: string
-        default: 603.0.0
+        default: 604.0.0
         description: "swift-format version"
         # The version of swift-format to tag. If this is a prerelease, `-prerelease-<date>` is added to this version.
         required: true
       swift_syntax_tag:
         type: string
-        default: 603.0.0
+        default: 604.0.0
         description: "swift-syntax version"
         # The swift-syntax version to depend on. If this is a prerelease, the latest swift-syntax prerelease tag for this version is used.
         required: true