diff --git a/book/src/requirements.txt b/book/src/requirements.txt
index 88a6acbc..abba0b7b 100644
--- a/book/src/requirements.txt
+++ b/book/src/requirements.txt
@@ -2,7 +2,7 @@ black==24.10.0
 coverage==7.10.6
 flake8==7.1.2
 hypothesis==6.140.2
-isort==5.13.2
+isort==6.1.0
 MutPy==0.6.1
 mypy==1.18.2
 mypy-extensions==1.1.0