diff --git a/requirements.txt b/requirements.txt
index b0e5a62..a49069c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,7 +6,7 @@ beautifulsoup4==4.3.2
 elasticsearch==1.2.0
 itsdangerous==0.24
 memoized-property==1.0.2
-nltk==3.0.0
+nltk==3.6.3
 requests==2.4.3
 textblob==0.9.0
 urllib3==1.9.1