diff --git a/.github/workflows/post-merge.yml b/.github/workflows/post-merge.yml
index e0e192e..21d4553 100644
--- a/.github/workflows/post-merge.yml
+++ b/.github/workflows/post-merge.yml
@@ -39,7 +39,7 @@ jobs:
       # Install Node.
       #
       - name: Install Node
-        uses: actions/setup-node@64ed1c7eab4cce3362f8c340dee64e5eaeef8f7c
+        uses: actions/setup-node@39370e3970a6d050c480ffad4ff0ed4d3fdee5af #v4.1.0
         with:
           node-version: "20.18.0"