diff --git a/.github/workflows/release-publish.yml b/.github/workflows/release-publish.yml
index d624a93..e2d9e48 100644
--- a/.github/workflows/release-publish.yml
+++ b/.github/workflows/release-publish.yml
@@ -20,12 +20,13 @@ jobs:
         id: version
         with:
           script: |
-            const semver = context.ref.replace('refs/tags/v', '')
+            const tag = ${{ github.event.release.tag_name }};
+            const semver = tag.replace('v', '');
             if (semver.match(/^[0-9]+\.[0-9]+\.[0-9]+$/)) {
               return semver
             }
 
-            throw new Error('not semver')
+            throw new Error('Invalid tag: ' + tag);
           result-encoding: string
 
       - run: npm ci