diff --git a/.github/workflows/link_checker.yaml b/.github/workflows/link_checker.yaml
index efcf931..ea5d3a7 100644
--- a/.github/workflows/link_checker.yaml
+++ b/.github/workflows/link_checker.yaml
@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
       - name: Check links with linkcheck
         uses: filiph/linkcheck@3.0.0
         with:
diff --git a/skip_file.txt b/skip_file.txt
new file mode 100644
index 0000000..11d9d33
--- /dev/null
+++ b/skip_file.txt
@@ -0,0 +1,2 @@
+# URLs matching these patterns will be skipped by the link checker.
+# Each line is a regular expression.