diff --git a/requirements.txt b/requirements.txt
index 6e42ea2..afb577a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -99,7 +99,7 @@ nbconvert==5.4.1
 nbformat==4.4.0
 neptune-client==0.4.114
 networkx==2.2
-nltk==3.4
+nltk==3.4.5
 nose==1.3.7
 numpy==1.16.2
 oauthlib==3.1.0