diff --git a/requirements.txt b/requirements.txt
index 74ed432..5953762 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -34,7 +34,7 @@ msgpack==0.5.6
 msgpack-numpy==0.4.3.2
 murmurhash==1.0.1
 newspaper3k==0.2.8
-nltk==3.4
+nltk==3.6.3
 numpy==1.15.4
 pandas==0.23.4
 Pillow==5.4.1