diff --git a/CNN.TensorFlow.Tutorial/requirements.txt b/CNN.TensorFlow.Tutorial/requirements.txt
index 7ab1404..5eaa7ba 100644
--- a/CNN.TensorFlow.Tutorial/requirements.txt
+++ b/CNN.TensorFlow.Tutorial/requirements.txt
@@ -88,7 +88,7 @@ python-socketio==4.5.0
 pytz==2019.3
 pywin32==301
 pywinpty==0.5.7
-pyzmq==19.0.0
+pyzmq==25.1.1
 qtconsole==4.7.3
 QtPy==1.9.0
 regex==2020.4.4