diff --git a/requirements.txt b/requirements.txt
index 61fd887..58fc567 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -40,7 +40,7 @@ mechanize==0.2.5
 mock==1.0.1
 multicorn==1.1.0.dev0
 MySQL-python==1.2.5
-nltk==3.0.5
+nltk==3.4.5
 nose==1.3.4
 numpy==1.9.2
 oauth2==1.5.211