diff --git a/agent/python-agent/pyproject.toml b/agent/python-agent/pyproject.toml
index 8824f8c..7380179 100644
--- a/agent/python-agent/pyproject.toml
+++ b/agent/python-agent/pyproject.toml
@@ -4,7 +4,7 @@ version = "0.1.0"
 requires-python = ">=3.12"
 dependencies = [
     "google-genai>=1.64.0",
-    "a2a-sdk>=0.3.0",
+    "a2a-sdk>=1.0.3",
     "google-adk>=1.28.0",
     "a2ui-agent-sdk>=0.2.1",
     "jsonschema>=4.0.0",