diff --git a/requirements.txt b/requirements.txt
index 29d5c59..7f38834 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -16,7 +16,7 @@ Jinja2==2.9.6
 lxml==3.8.0
 MarkupSafe==1.0
 newspaper3k==0.2.2
-nltk==3.2.4
+nltk==3.4.5
 olefile==0.44
 Pillow==4.2.1
 python-dateutil==2.6.1