diff --git a/requirements.txt b/requirements.txt
index 72e5558..fb5a749 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,6 +3,6 @@ Flask>=1.0.0
 itsdangerous==0.24
 Jinja2==2.10.1
 MarkupSafe==0.23
-nltk==3.2.1
+nltk==3.4.5
 psycopg2==2.6.1
 Werkzeug==0.11.1