diff --git a/lib/pytest-lsp/pytest_lsp/client.py b/lib/pytest-lsp/pytest_lsp/client.py
index 0df91e5..caeeca2 100644
--- a/lib/pytest-lsp/pytest_lsp/client.py
+++ b/lib/pytest-lsp/pytest_lsp/client.py
@@ -23,6 +23,7 @@
 from .protocol import LanguageClientProtocol
 
 if typing.TYPE_CHECKING:
+    from collections.abc import Sequence
     from typing import Any
 
 
@@ -53,7 +54,7 @@ def __init__(self, *args, configuration: dict[str, Any] | None = None, **kwargs)
         self.log_messages: list[types.LogMessageParams] = []
         """Holds any received ``window/logMessage`` requests."""
 
-        self.diagnostics: dict[str, list[types.Diagnostic]] = {}
+        self.diagnostics: dict[str, Sequence[types.Diagnostic]] = {}
         """Holds any recieved diagnostics."""
 
         self.progress_reports: dict[
@@ -108,7 +109,7 @@ async def server_exit(self, server: asyncio.subprocess.Process):
                 logger.debug("Cancelled pending request '%s': %s", id_, reason)
 
     def report_server_error(
-        self, error: Exception, source: PyglsError | JsonRpcException
+        self, error: Exception, source: type[PyglsError | JsonRpcException]
     ):
         """Called when the server does something unexpected, e.g. sending malformed
         JSON."""
diff --git a/lib/pytest-lsp/pytest_lsp/protocol.py b/lib/pytest-lsp/pytest_lsp/protocol.py
index 23efe5f..8578747 100644
--- a/lib/pytest-lsp/pytest_lsp/protocol.py
+++ b/lib/pytest-lsp/pytest_lsp/protocol.py
@@ -54,7 +54,7 @@ def _handle_notification(self, method_name, params):
 
         super()._handle_notification(method_name, params)
 
-    async def send_request_async(self, method, params=None):
+    async def send_request_async(self, method, params=None, msg_id=None):
         """Wrap pygls' ``send_request_async`` implementation. This will
 
         - Check the params to see if they're compatible with the client's stated
@@ -78,7 +78,7 @@ async def send_request_async(self, method, params=None):
         check_params_against_client_capabilities(
             self._server.capabilities, method, params
         )
-        result = await super().send_request_async(method, params)
+        result = await super().send_request_async(method, params, msg_id)
         check_result_against_client_capabilities(
             self._server.capabilities,
             method,