diff --git a/ML/requirements.txt b/ML/requirements.txt
index c60135c4..acb2c7c3 100644
--- a/ML/requirements.txt
+++ b/ML/requirements.txt
@@ -217,7 +217,7 @@ ndjson==0.3.1
 nest-asyncio @ file:///home/conda/feedstock_root/build_artifacts/nest-asyncio_1617163391303/work
 netifaces==0.11.0
 networkx==2.6.3
-nltk==3.6.6
+nltk==3.9
 nodeenv==1.6.0
 notebook==6.4.10
 numpy==1.21.4