diff --git a/requirements.txt b/requirements.txt
index ee0169d..2c360c8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,7 +8,7 @@ dask==0.11.1
 decorator==4.0.10
 Django==1.10.1
 msgpack-python==0.4.8
-nltk==3.4.1
+nltk==3.4.5
 pika==0.10.0
 pyparsing==2.1.10
 python-dateutil==2.5.3