diff --git a/smtag/requirements.txt b/smtag/requirements.txt
index c35207d..877a1ac 100644
--- a/smtag/requirements.txt
+++ b/smtag/requirements.txt
@@ -5,7 +5,7 @@ numpy==1.16.3
 torch==1.0.1
 torchvision==0.2.2.post3
 neo4jrestclient==2.1.1
-nltk == 3.4.1
+nltk == 3.4.5
 tensorboardX==1.6
 google-cloud-vision==0.34
 google-auth==1.5.1