diff --git a/requirements.txt b/requirements.txt
index faf8d6f..07b4297 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -73,7 +73,7 @@ mistune==0.8.4
 murmurhash==1.0.5
 nbconvert==5.6.1
 nbformat==5.0.4
-nltk==3.6.5
+nltk==3.6.6
 numexpr==2.7.3
 numpy==1.21.0
 oauthlib==3.1.0