diff --git a/.github/workflows/merge-acceptance.yaml b/.github/workflows/merge-acceptance.yaml
index 7ac08bb..92df600 100644
--- a/.github/workflows/merge-acceptance.yaml
+++ b/.github/workflows/merge-acceptance.yaml
@@ -12,7 +12,7 @@ jobs:
     - uses: taiki-e/cache-cargo-install-action@v1
       with:
         tool: mdbook-katex@0.6.0
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - run: mdbook build
     - name: Check for Orphaned Files
       run: ./util/find-orphaned-files.sh
diff --git a/.github/workflows/render-site.yaml b/.github/workflows/render-site.yaml
index 4750555..8b9d111 100644
--- a/.github/workflows/render-site.yaml
+++ b/.github/workflows/render-site.yaml
@@ -24,7 +24,7 @@ jobs:
         tool: mdbook-katex@0.6.0
 
     # Now get the user content:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     # Now render to the site: