diff --git a/requirements.txt b/requirements.txt
index e06b7c2..a1133b1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,7 +4,7 @@ cycler==0.10.0
 idna==2.7
 kiwisolver==1.0.1
 matplotlib==2.2.2
-nltk==3.3
+nltk==3.4.5
 numpy==1.14.5
 oauthlib==2.1.0
 pandas==0.23.3