diff --git a/agent/python-agent/pyproject.toml b/agent/python-agent/pyproject.toml
index 8824f8c..1e0a81f 100644
--- a/agent/python-agent/pyproject.toml
+++ b/agent/python-agent/pyproject.toml
@@ -7,7 +7,7 @@ dependencies = [
     "a2a-sdk>=0.3.0",
     "google-adk>=1.28.0",
     "a2ui-agent-sdk>=0.2.1",
-    "jsonschema>=4.0.0",
+    "jsonschema>=4.26.0",
 ]
 
 [dependency-groups]