diff --git a/requirements.txt b/requirements.txt
index ade5f8a..329a0a8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,7 @@ Flask==1.0.2
 stop_words==2018.7.23
 wordsegment==1.3.1
 networkx==2.5.1
-nltk==3.4
+nltk==3.4.5
 jellyfish==0.7.1
 geocoder==1.38.1
 spacy==2.3.5