diff --git a/backend/requirements/default.txt b/backend/requirements/default.txt
index fc36432dfd0..e6949c53ec5 100644
--- a/backend/requirements/default.txt
+++ b/backend/requirements/default.txt
@@ -33,7 +33,7 @@ litellm==1.37.7
 llama-index==0.9.45
 Mako==1.2.4
 msal==1.26.0
-nltk==3.8.1
+nltk==3.9.4
 Office365-REST-Python-Client==2.5.9
 oauthlib==3.2.2
 openai==1.14.3