diff --git a/requirements.txt b/requirements.txt
index d74912c..ef8163a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -14,7 +14,7 @@ lazy-object-proxy==1.3.1
 MarkupSafe==1.1.0
 matplotlib==3.0.0
 mccabe==0.6.1
-nltk==3.3
+nltk==3.4.5
 numpy==1.15.2
 oauthlib==2.1.0
 pylint==2.1.1