diff --git a/chatbots/ml_bot/requirements.txt b/chatbots/ml_bot/requirements.txt
index c3519c3..b777ff5 100644
--- a/chatbots/ml_bot/requirements.txt
+++ b/chatbots/ml_bot/requirements.txt
@@ -10,7 +10,7 @@ joblib==1.0.1
 kiwisolver==1.3.1
 matplotlib==3.4.2
 networkx==2.5.1
-nltk==3.6.2
+nltk==3.6.6
 numpy==1.20.3
 Pillow==8.2.0
 pydub==0.25.1