diff --git a/requirements.txt b/requirements.txt
index a356194..e871f62 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -29,7 +29,7 @@ MarkupSafe==1.0
 money==1.3.0
 monotonic==1.5
 multidict==4.4.0
-nltk==3.3
+nltk==3.4.5
 numpy==1.15.1
 passlib==1.7.1
 pycares==2.3.0