diff --git a/requirements.txt b/requirements.txt
index 15cd727..4520993 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -53,7 +53,7 @@ mccabe==0.6.1
 msgpack==0.6.1
 mysql-connector-python==8.0.14
 networkx==2.3
-nltk==3.4.3
+nltk==3.4.5
 numpy==1.16.0
 oauth2client==4.1.3
 pandas==0.25.1