diff --git a/arithmetic_sampling/requirements.txt b/arithmetic_sampling/requirements.txt
index b7cd94f0a9c..079d38024be 100644
--- a/arithmetic_sampling/requirements.txt
+++ b/arithmetic_sampling/requirements.txt
@@ -36,7 +36,7 @@ MarkupSafe==2.1.2
 mdurl==0.1.2
 ml-collections==0.1.1
 ml-dtypes==0.1.0
-msgpack==1.0.5
+msgpack==1.2.1
 mypy-extensions==1.0.0
 nest-asyncio==1.5.6
 numpy==1.23.5