diff --git a/requirements.txt b/requirements.txt
index 7fef4a5..c81a53c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -17,7 +17,7 @@ idna==2.0
 ipaddress==1.0.7
 itsdangerous==0.24
 ndg-httpsclient==0.4.0
-nltk==3.0.2
+nltk==3.4.5
 nose==1.3.6
 numpy==1.9.2
 nyc-geoclient==0.0.2