diff --git a/requirements.txt b/requirements.txt
index 34966f89..041460c6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -74,7 +74,7 @@ msgpack==0.5.6
 msgpack-numpy==0.4.3.2
 murmurhash==1.0.1
 newspaper3k==0.2.8
-nltk==3.6.2
+nltk==3.9
 numpy
 oauthlib==3.1.0
 opensearch-py==2.2.0