diff --git a/.github/workflows/test-bookdown.yml b/.github/workflows/test-bookdown.yml
index b0e651c..7cc09db 100644
--- a/.github/workflows/test-bookdown.yml
+++ b/.github/workflows/test-bookdown.yml
@@ -47,7 +47,7 @@ jobs:
           echo "::set-output name=msg::${last_commit_msg}"
 
       - name: Cache bookdown results
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: docs
           key: bookdown-${{ hashFiles('**/*Rmd') }}
diff --git a/.github/workflows/update-bookdown.yml b/.github/workflows/update-bookdown.yml
index 03fe797..e497ff7 100644
--- a/.github/workflows/update-bookdown.yml
+++ b/.github/workflows/update-bookdown.yml
@@ -48,7 +48,7 @@ jobs:
           echo "::set-output name=msg::${last_commit_msg}"
 
       - name: Cache bookdown results
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: docs
           key: bookdown-${{ hashFiles('**/*Rmd') }}