diff --git a/requirements.txt b/requirements.txt
index 3e66363..973400a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
 Flask==0.12
-nltk==3.2.2
+nltk==3.4.5
 requests==2.13.0
 wikipedia==1.4.0