diff --git a/pyproject.toml b/pyproject.toml
index 4cc99f4..1f6dec2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -30,7 +30,7 @@ remote = ["acpremote>=1.0.0,<2.0.0"]
 
 dev = [
     "acpremote",
-    "agent-client-protocol==0.9.0",
+    "agent-client-protocol==0.11.0",
     "basedpyright",
     "codex-auth-helper",
     "langchain-openai>=0.3.26",