diff --git a/requirements.txt b/requirements.txt
index f9141f0..c72497f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,7 +11,7 @@ idna==2.10
 importlib-metadata==3.3.0
 joblib==1.0.0
 mccabe==0.6.1
-nltk==3.5
+nltk==3.6.6
 numpy==1.19.4
 packaging==20.8
 pandas==1.1.5