diff --git a/paxml/pip_package/requirements.txt b/paxml/pip_package/requirements.txt
index f6c304a4..b4611c70 100644
--- a/paxml/pip_package/requirements.txt
+++ b/paxml/pip_package/requirements.txt
@@ -377,7 +377,7 @@ nest-asyncio==1.6.0
     # via
     #   ipykernel
     #   orbax-checkpoint
-nltk==3.9.1
+nltk==3.9.4
     # via
     #   rouge-score
     #   t5