diff --git a/requirements.txt b/requirements.txt
index ea9858d..7466bf1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -19,7 +19,7 @@ jedi==0.11.1
 jmespath==0.9.3
 kiwisolver==1.0.1
 matplotlib==2.2.2
-nltk==3.2.5
+nltk==3.4.5
 numpy==1.14.1
 olefile==0.45.1
 pandas==0.22.0