diff --git a/requirements.txt b/requirements.txt
index 2d6ca6b..dde210a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -20,7 +20,7 @@ kombu==3.0.37
 MarkupSafe==1.0
 mysqlclient==1.3.13
 ngram==3.3.2
-nltk==3.3
+nltk==3.4.5
 python-memcached==1.59
 pytz==2018.5
 redis==2.10.6