diff --git a/src/agent_toolkit/pyproject.toml b/src/agent_toolkit/pyproject.toml
index 54d7f3ce0..1e580fed2 100644
--- a/src/agent_toolkit/pyproject.toml
+++ b/src/agent_toolkit/pyproject.toml
@@ -22,6 +22,7 @@ oic = "~=1.4"
 pyjwt = "^2"
 cachetools = "~=5.2"
 marshmallow-jsonapi = ">=0.24.0, <1.0"
+marshmallow = "<3.24.0"
 sseclient-py = "^1.5"
 forestadmin-datasource-toolkit = "1.22.1"
 [[tool.poetry.dependencies.pandas]]