diff --git a/.github/workflows/deploy-book.yml b/.github/workflows/deploy-book.yml
index 9622ab9a..2654c94e 100644
--- a/.github/workflows/deploy-book.yml
+++ b/.github/workflows/deploy-book.yml
@@ -17,7 +17,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        python-version: [3.10.20]
+        python-version: [3.10.21]
     steps:
     - uses: actions/checkout@v2