diff --git a/backend/requirements.txt b/backend/requirements.txt
index 7a1b180..f5ab0c7 100644
--- a/backend/requirements.txt
+++ b/backend/requirements.txt
@@ -1,7 +1,7 @@
 Flask==1.1.1
 Flask-Cors==3.0.9
 joblib==0.14.1
-nltk==3.4.5
+nltk==3.6.5
 numpy==1.18.1
 pymongo==3.10.1
 scikit-learn==0.22.2.post1