diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index a369d97..c6d3de9 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -506,7 +506,7 @@ jobs:
 
       - name: Checkout existing gh-pages content
         id: checkout-pages
-        uses: actions/checkout@v6
+        uses: actions/checkout@v6.0.3
         with:
           ref: gh-pages
           path: _site
diff --git a/.github/workflows/schedule.yaml b/.github/workflows/schedule.yaml
index e8acd18..b4fe0ee 100644
--- a/.github/workflows/schedule.yaml
+++ b/.github/workflows/schedule.yaml
@@ -103,7 +103,7 @@ jobs:
 
       - name: Checkout existing gh-pages content
         id: checkout-pages
-        uses: actions/checkout@v6
+        uses: actions/checkout@v6.0.3
         with:
           ref: gh-pages
           path: _site