diff --git a/server/virtualenv/datamine-requirements.txt b/server/virtualenv/datamine-requirements.txt
index 8d61bb8..632a7b1 100644
--- a/server/virtualenv/datamine-requirements.txt
+++ b/server/virtualenv/datamine-requirements.txt
@@ -10,7 +10,7 @@ pyyaml
 wsgiref==0.1.2
 
 # Datamine specific
-nltk==2.0.1rc1
+nltk==3.4.5
 numpy >= 1.6.1
 scipy >= 0.9.0