diff --git a/.github/workflows/book.yml b/.github/workflows/book.yml
index b1066b1..1debe65 100644
--- a/.github/workflows/book.yml
+++ b/.github/workflows/book.yml
@@ -12,7 +12,7 @@ jobs:
         sudo apt-get -yq update
         sudo apt-get install -yq pandoc texlive-xetex texlive-fonts-extra gfortran ffmpeg
     - name: Checkout
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     - name: Install Miniconda
       uses: conda-incubator/setup-miniconda@v3
       with: