diff --git a/Chapter09/TestApp/requirements.txt b/Chapter09/TestApp/requirements.txt
index be70dbe..70e6b77 100644
--- a/Chapter09/TestApp/requirements.txt
+++ b/Chapter09/TestApp/requirements.txt
@@ -3,7 +3,7 @@ Flask-HTTPAuth==3.3.0
 Flask-SQLAlchemy==2.4.1
 Jinja2==2.10.1
 MarkupSafe==1.1.1
-Pygments==2.4.2
+Pygments==2.7.4
 SQLAlchemy==1.3.9
 Werkzeug==0.16.0
 httpie==1.0.3