diff --git a/requirements.txt b/requirements.txt
index 1b6f70d..78f0f26 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ Werkzeug==0.9.6
 beautifulsoup4==4.3.2
 itsdangerous==0.24
 ner==0.1
-nltk==3.0.0
+nltk==3.4.5
 numpy==1.9.1
 pygeocoder==1.2.5
 python-memcached==1.53