diff --git a/requirements.txt b/requirements.txt
index 5dcf62e..e0cb998 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,7 +13,7 @@ itsdangerous==1.1.0
 Jinja2==2.10
 jmespath==0.9.3
 MarkupSafe==1.1.0
-nltk==3.4
+nltk==3.4.5
 numpy==1.16.1
 python-dateutil==2.8.0
 requests==2.21.0