diff --git a/requirements.txt b/requirements.txt
index 55c9478..aaf6ed4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ Flask-Migrate==2.5.3
 Flask-Script==2.0.6
 Flask-SQLAlchemy==2.4.4
 gensim==3.8.1
-nltk==3.4.5
+nltk==3.6.6
 numpy==1.22.0
 pandas==1.0.3
 psycopg2-binary==2.8.6