diff --git a/.circleci/config.yml b/.circleci/config.yml
index a22645a5..183eb48a 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -2,7 +2,7 @@ version: 2.1
 jobs:
   build-book:
     docker:
-      - image: cimg/python:3.9
+      - image: cimg/python:3.13
     steps:
       - checkout
       - run:
diff --git a/.github/workflows/build-book.yml b/.github/workflows/build-book.yml
index b8dcb7f2..8742a084 100644
--- a/.github/workflows/build-book.yml
+++ b/.github/workflows/build-book.yml
@@ -20,7 +20,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v5
         with:
-          python-version: "3.9"
+          python-version: "3.13"
 
       - name: Upgrade pip
         run: |