diff --git a/book/src/requirements.txt b/book/src/requirements.txt
index 3d4a80d2..01719005 100644
--- a/book/src/requirements.txt
+++ b/book/src/requirements.txt
@@ -8,7 +8,7 @@ mypy==1.17.0
 mypy-extensions==1.1.0
 pinject==0.14.1
 pip-tools==7.4.1
-pyflakes==3.2.0
+pyflakes==3.4.0
 pylint==3.3.7
 pytest==8.4.1
 pytest-cov==5.0.0