diff --git a/book/requirements.txt b/book/requirements.txt
index ac701d0..d978c3a 100644
--- a/book/requirements.txt
+++ b/book/requirements.txt
@@ -1,4 +1,4 @@
-Flask==1.0
+Flask==2.2.5
 SQLAlchemy==0.9.7
 bpython==0.13.1
 coverage==3.7.1