diff --git a/requirements.txt b/requirements.txt
index 75eb330..3532205 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,7 +13,7 @@ matplotlib==3.0.2
 neo4j==1.7.4
 neobolt==1.7.13
 neotime==1.7.4
-nltk==3.4
+nltk==3.4.5
 numpy==1.16.1
 pandas==0.24.0
 prompt-toolkit==2.0.9