diff --git a/requirements.txt b/requirements.txt
index 37f6077..b24613d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -17,7 +17,7 @@ jusText==2.2.0
 kombu==4.1.0
 lxml==4.2.1
 MarkupSafe==1.0
-nltk==3.3
+nltk==3.4.5
 pymongo==3.6.0
 pytz==2018.3
 redis==2.10.6