diff --git a/requirements.txt b/requirements.txt
index 72acbf2..171387c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -75,7 +75,7 @@ nbclient==0.7.2
 nbconvert==7.2.9
 nbformat==5.7.3
 nest-asyncio==1.5.6
-nltk==3.8.1
+nltk==3.9
 node-semver==0.6.1
 nose==1.3.7
 notebook==6.5.2