diff --git a/web/flask/mega_tutorial/chapter13-language/app/requirements.txt b/web/flask/mega_tutorial/chapter13-language/app/requirements.txt
index 454923d..15d9230 100644
--- a/web/flask/mega_tutorial/chapter13-language/app/requirements.txt
+++ b/web/flask/mega_tutorial/chapter13-language/app/requirements.txt
@@ -26,7 +26,7 @@ Jinja2==2.10.1
 Mako==1.1.0
 MarkupSafe==1.1.1
 Pillow==6.1.0
-PyJWT==1.7.1
+PyJWT==2.4.0
 python-dateutil==2.8.0
 python-editor==1.0.4
 pytz==2019.2