diff --git a/requirements.txt b/requirements.txt
index 43e9e659..de22db64 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -27,7 +27,7 @@ mistune==0.8.4
 more-itertools==8.4.0
 nbconvert==5.6.1
 nbformat==5.0.7
-nltk==3.6.5
+nltk==3.6.6
 notebook==6.4.1
 numpy==1.19.0
 packaging==20.4