diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 9a8e80d..63302b4 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -17,7 +17,8 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: '18'
+          # Use Node 20 so web platform globals (File/Blob) are available
+          node-version: '20'
           cache: 'npm'
 
       - name: Get version from tag