diff --git a/requirements.txt b/requirements.txt
index 8c243aa3e..03256d60f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 MySQL-python==1.2.5
-nltk==3.2.4
+nltk==3.4.5
 pandas==0.20.2
 python-dateutil==2.6.0
 scikit-learn==0.18.2