diff --git a/requirements.txt b/requirements.txt
index 4742e9e7..e4f81df4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -16,7 +16,7 @@ django-filter==0.9.2
 django-redis==3.8.3
 redis==2.10.3
 requests
-nltk==3.1
+nltk==3.4.5
 textblob==0.10.0
 anora==0.1.2
 snowballstemmer==1.2.0