diff --git a/requirements.txt b/requirements.txt
index d699cd2..1bf3623 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,7 +7,7 @@ Django==1.10.4
 djangorestframework==3.5.3
 jieba==0.38
 munch==2.1.0
-nltk==3.2.1
+nltk==3.4.5
 numpy==1.11.3
 six==1.10.0
 terminado==0.6