diff --git a/.github/workflows/preview-website.yml b/.github/workflows/preview-website.yml
index d8bb7e3faa..0a7f6a9e92 100644
--- a/.github/workflows/preview-website.yml
+++ b/.github/workflows/preview-website.yml
@@ -29,8 +29,11 @@ jobs:
 
       - uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
         with:
-          node-version: '22'
-          check-latest: true
+          # Pin to 22.22.x: Node 22.23.0 / 24.17.0 ship a keep-alive socket
+          # regression (nodejs/node#63989) that breaks node-fetch, causing
+          # firebase auth to fail with "Premature close". 22.22.x is the
+          # latest known-good release.
+          node-version: '22.22.3'
 
       - name: Install yq
         run: |