diff --git a/pyproject.toml b/pyproject.toml
index 2fc88b3..4ad791a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -5,7 +5,7 @@ description = "A Python implement of Agent Client Protocol (ACP, by Zed Industri
 authors = [{ name = "Chojan Shang", email = "psiace@apache.org" }]
 readme = "README.md"
 keywords = ['python']
-requires-python = ">=3.10,<=3.14"
+requires-python = ">=3.10,<3.15"
 classifiers = [
     "Intended Audience :: Developers",
     "Programming Language :: Python",
diff --git a/src/acp/exceptions.py b/src/acp/exceptions.py
index 898ca40..06098dd 100644
--- a/src/acp/exceptions.py
+++ b/src/acp/exceptions.py
@@ -13,34 +13,34 @@ def __init__(self, code: int, message: str, data: Any | None = None) -> None:
         self.code = code
         self.data = data
 
-    @staticmethod
-    def parse_error(data: dict[str, Any] | None = None) -> RequestError:
-        return RequestError(-32700, "Parse error", data)
+    @classmethod
+    def parse_error(cls, data: dict[str, Any] | None = None) -> RequestError:
+        return cls(-32700, "Parse error", data)
 
-    @staticmethod
-    def invalid_request(data: dict[str, Any] | None = None) -> RequestError:
-        return RequestError(-32600, "Invalid request", data)
+    @classmethod
+    def invalid_request(cls, data: dict[str, Any] | None = None) -> RequestError:
+        return cls(-32600, "Invalid request", data)
 
-    @staticmethod
-    def method_not_found(method: str) -> RequestError:
-        return RequestError(-32601, "Method not found", {"method": method})
+    @classmethod
+    def method_not_found(cls, method: str) -> RequestError:
+        return cls(-32601, "Method not found", {"method": method})
 
-    @staticmethod
-    def invalid_params(data: dict[str, Any] | None = None) -> RequestError:
-        return RequestError(-32602, "Invalid params", data)
+    @classmethod
+    def invalid_params(cls, data: dict[str, Any] | None = None) -> RequestError:
+        return cls(-32602, "Invalid params", data)
 
-    @staticmethod
-    def internal_error(data: dict[str, Any] | None = None) -> RequestError:
-        return RequestError(-32603, "Internal error", data)
+    @classmethod
+    def internal_error(cls, data: dict[str, Any] | None = None) -> RequestError:
+        return cls(-32603, "Internal error", data)
 
-    @staticmethod
-    def auth_required(data: dict[str, Any] | None = None) -> RequestError:
-        return RequestError(-32000, "Authentication required", data)
+    @classmethod
+    def auth_required(cls, data: dict[str, Any] | None = None) -> RequestError:
+        return cls(-32000, "Authentication required", data)
 
-    @staticmethod
-    def resource_not_found(uri: str | None = None) -> RequestError:
+    @classmethod
+    def resource_not_found(cls, uri: str | None = None) -> RequestError:
         data = {"uri": uri} if uri is not None else None
-        return RequestError(-32002, "Resource not found", data)
+        return cls(-32002, "Resource not found", data)
 
     def to_error_obj(self) -> dict[str, Any]:
         return {"code": self.code, "message": str(self), "data": self.data}
diff --git a/uv.lock b/uv.lock
index 4c6b491..10967c7 100644
--- a/uv.lock
+++ b/uv.lock
@@ -1,6 +1,6 @@
 version = 1
 revision = 3
-requires-python = ">=3.10, <=3.14"
+requires-python = ">=3.10, <3.15"
 
 [[package]]
 name = "agent-client-protocol"