diff --git a/requirements.txt b/requirements.txt
index 45871ed..5084081 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ goose-extractor==1.0.25
 jieba==0.38
 langid==1.1.5
 lxml==3.6.0
-nltk==3.2
+nltk==3.4.5
 numexpr==2.5
 numpy==1.10.4
 Pillow==3.1.1