diff --git a/requirements.txt b/requirements.txt
index fe250bb..d0931f6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,6 +2,6 @@ pandas>=0.22.0
 numpy>=1.15.1
 scikit_learn>=0.20.0
 streamlit==0.57.0
-nltk== 3.5
+nltk== 3.9
 matplotlib == 3.2.2