diff --git a/app/utils/requirements.txt b/app/utils/requirements.txt
index 2a361439ba..7c2a302dbe 100644
--- a/app/utils/requirements.txt
+++ b/app/utils/requirements.txt
@@ -34,7 +34,7 @@ MarkupSafe==0.23
 marshmallow==2.7.3
 marshmallow-sqlalchemy==0.8.1
 mysql-connector==2.1.4
-nltk==3.2.2
+nltk==3.6.3
 numpy==1.14.2
 packaging==16.8
 paramiko==2.4.1