diff --git a/requirements.txt b/requirements.txt
index 1cf9774..7577a53 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
 ipdb
 docopt==0.6.2
 matplotlib==1.5.3
-nltk==3.2.1
+nltk==3.4.5
 numpy==1.11.2
 pandas==0.19.0
 scikit-learn==0.18