diff --git a/requirements.all.txt b/requirements.all.txt
index 10f81074fa..415d49e4cb 100644
--- a/requirements.all.txt
+++ b/requirements.all.txt
@@ -57,7 +57,7 @@ markupsafe==3.0.2
 mccabe==0.7.0
 more-itertools==10.7.0
 moto==5.1.9
-msgpack==1.1.1
+msgpack==1.2.1
 mypy==1.17.1
 mypy-boto3-apigateway==1.40.0
 mypy-boto3-cloudwatch==1.40.0
diff --git a/requirements.txt b/requirements.txt
index d8583c1cdd..7478682131 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,7 +13,7 @@ http-message-signatures==1.0.0
 http_sfv==0.9.9
 jmespath==1.0.1
 more-itertools==10.7.0
-msgpack==1.1.1
+msgpack==1.2.1
 opensearch-py==2.8.0  # < 3 to match server
 requests==2.32.4
 resumablesha256==1.0