diff --git a/lib/lsp-devtools/changes/xxx.misc.rst b/lib/lsp-devtools/changes/xxx.misc.rst
new file mode 100644
index 0000000..36caf8c
--- /dev/null
+++ b/lib/lsp-devtools/changes/xxx.misc.rst
@@ -0,0 +1 @@
+Migrate to pygls `v2.0a2`
diff --git a/lib/lsp-devtools/hatch.toml b/lib/lsp-devtools/hatch.toml
index 29ea2b4..bd5ec2b 100644
--- a/lib/lsp-devtools/hatch.toml
+++ b/lib/lsp-devtools/hatch.toml
@@ -11,6 +11,9 @@ packages = ["lsp_devtools"]
 [envs.hatch-test]
 extra-dependencies = ["pytest-asyncio"]
 
+[envs.hatch-test.env-vars]
+UV_PRERELEASE="allow"
+
 [envs.hatch-static-analysis]
 config-path = "ruff_defaults.toml"
 dependencies = ["ruff==0.5.2"]
diff --git a/lib/lsp-devtools/lsp_devtools/agent/agent.py b/lib/lsp-devtools/lsp_devtools/agent/agent.py
index 4d0e26f..817eec9 100644
--- a/lib/lsp-devtools/lsp_devtools/agent/agent.py
+++ b/lib/lsp-devtools/lsp_devtools/agent/agent.py
@@ -21,6 +21,10 @@
     from typing import Callable
     from typing import Union
 
+    from pygls.io_ import AsyncReader
+    from pygls.io_ import AsyncWriter
+    from pygls.io_ import Writer
+
     MessageHandler = Callable[[bytes], Union[None, Coroutine[Any, Any, None]]]
 
 UTC = timezone.utc
@@ -74,7 +78,7 @@ def parse_rpc_message(data: bytes) -> RPCMessage:
     return RPCMessage(headers, body)
 
 
-async def aio_readline(reader: asyncio.StreamReader, message_handler: MessageHandler):
+async def aio_readline(reader: AsyncReader, message_handler: MessageHandler):
     CONTENT_LENGTH_PATTERN = re.compile(rb"^Content-Length: (\d+)\r\n$")
 
     # Initialize message buffer
@@ -222,12 +226,10 @@ async def stop(self):
             except TimeoutError:
                 self.server.kill()
 
-        args = {}
-        args["msg"] = "lsp-devtools agent is stopping."
-
         # Cancel the tasks connecting client to server
         for task in self._tasks:
-            task.cancel(**args)
+            logger.debug("cancelling: %s", task)
+            task.cancel(msg="lsp-devtools agent is stopping.")
 
         if self.writer:
             self.writer.close()
diff --git a/lib/lsp-devtools/lsp_devtools/agent/client.py b/lib/lsp-devtools/lsp_devtools/agent/client.py
index 87e9d4c..571819f 100644
--- a/lib/lsp-devtools/lsp_devtools/agent/client.py
+++ b/lib/lsp-devtools/lsp_devtools/agent/client.py
@@ -1,11 +1,11 @@
 from __future__ import annotations
 
 import asyncio
+import inspect
 import typing
 
 import stamina
 from pygls.client import JsonRPCClient
-from pygls.client import aio_readline
 from pygls.protocol import default_converter
 
 from lsp_devtools.agent.protocol import AgentProtocol
@@ -13,25 +13,6 @@
 if typing.TYPE_CHECKING:
     from typing import Any
 
-# from websockets.client import WebSocketClientProtocol
-
-
-# class WebSocketClientTransportAdapter:
-#     """Protocol adapter for the WebSocket client interface."""
-
-#     def __init__(self, ws: WebSocketClientProtocol, loop: asyncio.AbstractEventLoop):
-#         self._ws = ws
-#         self._loop = loop
-
-#     def close(self) -> None:
-#         """Stop the WebSocket server."""
-#         print("-- CLOSING --")
-#         self._loop.create_task(self._ws.close())
-
-#     def write(self, data: Any) -> None:
-#         """Create a task to write specified data into a WebSocket."""
-#         asyncio.ensure_future(self._ws.send(data))
-
 
 class AgentClient(JsonRPCClient):
     """Client for connecting to an AgentServer instance."""
@@ -53,7 +34,6 @@ def _report_server_error(self, error, source):
     def feature(self, feature_name: str, options: Any | None = None):
         return self.protocol.fm.feature(feature_name, options)
 
-    # TODO: Upstream this... or at least something equivalent.
     async def start_tcp(self, host: str, port: int):
         # The user might not have started the server app immediately and since the
         # agent will live as long as the wrapper language server we may as well
@@ -67,71 +47,22 @@ async def start_tcp(self, host: str, port: int):
         )
         async for attempt in retries:
             with attempt:
-                reader, writer = await asyncio.open_connection(host, port)
-
-        self.protocol.connection_made(writer)  # type: ignore[arg-type]
-        connection = asyncio.create_task(
-            aio_readline(self._stop_event, reader, self.protocol.data_received)
-        )
-        self.connected = True
-        self._async_tasks.append(connection)
+                await super().start_tcp(host, port)
+                self.connected = True
 
     def forward_message(self, message: bytes):
         """Forward the given message to the server instance."""
 
-        if not self.connected:
+        if not self.connected or self.protocol.writer is None:
             self._buffer.append(message)
             return
 
-        if self.protocol.transport is None:
-            return
-
         # Send any buffered messages
         while len(self._buffer) > 0:
-            self.protocol.transport.write(self._buffer.pop(0))
-
-        self.protocol.transport.write(message)
-
-    # TODO: Upstream this... or at least something equivalent.
-    # def start_ws(self, host: str, port: int):
-    #     self.protocol._send_only_body = True  # Don't send headers within the payload
-
-    #     async def client_connection(host: str, port: int):
-    #         """Create and run a client connection."""
-
-    #         self._client = await websockets.connect(  # type: ignore
-    #             f"ws://{host}:{port}"
-    #         )
-    #         loop = asyncio.get_running_loop()
-    #         self.protocol.transport = WebSocketClientTransportAdapter(
-    #             self._client, loop
-    #         )
-    #         message = None
-
-    #         try:
-    #             while not self._stop_event.is_set():
-    #                 try:
-    #                     message = await asyncio.wait_for(
-    #                         self._client.recv(), timeout=0.5
-    #                     )
-    #                     self.protocol._procedure_handler(
-    #                         json.loads(
-    #                             message,
-    #                             object_hook=self.protocol._deserialize_message
-    #                         )
-    #                     )
-    #                 except JSONDecodeError:
-    #                     print(message or "-- message not found --")
-    #                     raise
-    #                 except TimeoutError:
-    #                     pass
-    #                 except Exception:
-    #                     raise
-
-    #         finally:
-    #             await self._client.close()
+            res = self.protocol.writer.write(self._buffer.pop(0))
+            if inspect.isawaitable(res):
+                asyncio.ensure_future(res)
 
-    #     try:
-    #         asyncio.run(client_connection(host, port))
-    #     except KeyboardInterrupt:
-    #         pass
+        res = self.protocol.writer.write(message)
+        if inspect.isawaitable(res):
+            asyncio.ensure_future(res)
diff --git a/lib/lsp-devtools/lsp_devtools/agent/server.py b/lib/lsp-devtools/lsp_devtools/agent/server.py
index f74a47a..df4893a 100644
--- a/lib/lsp-devtools/lsp_devtools/agent/server.py
+++ b/lib/lsp-devtools/lsp_devtools/agent/server.py
@@ -1,12 +1,13 @@
 from __future__ import annotations
 
 import asyncio
+import json
 import logging
 import traceback
 import typing
 
 from pygls.protocol import default_converter
-from pygls.server import Server
+from pygls.server import JsonRPCServer
 
 from lsp_devtools.agent.agent import aio_readline
 from lsp_devtools.agent.protocol import AgentProtocol
@@ -18,7 +19,7 @@
     from lsp_devtools.agent.agent import MessageHandler
 
 
-class AgentServer(Server):
+class AgentServer(JsonRPCServer):
     """A pygls server that accepts connections from agents allowing them to send their
     collected messages."""
 
@@ -40,25 +41,33 @@ def __init__(
         super().__init__(*args, **kwargs)
 
         self.logger = logger or logging.getLogger(__name__)
-        self.handler = handler or self.lsp.data_received
+        self.handler = handler or self._default_handler
         self.db: Database | None = None
 
         self._client_buffer: list[str] = []
         self._server_buffer: list[str] = []
         self._tcp_server: asyncio.Task | None = None
 
-    def _report_server_error(self, exc: Exception, source):
+    def _default_handler(self, data: bytes):
+        message = self.protocol.structure_message(json.loads(data))
+        self.protocol.handle_message(message)
+
+    def _report_server_error(self, error: Exception, source):
         """Report internal server errors."""
-        tb = "".join(traceback.format_exception(type(exc), exc, exc.__traceback__))
-        self.logger.error("%s: %s", type(exc).__name__, exc)
+        tb = "".join(
+            traceback.format_exception(type(error), error, error.__traceback__)
+        )
+        self.logger.error("%s: %s", type(error).__name__, error)
         self.logger.debug("%s", tb)
 
     def feature(self, feature_name: str, options: Any | None = None):
         return self.lsp.fm.feature(feature_name, options)
 
     async def start_tcp(self, host: str, port: int) -> None:  # type: ignore[override]
-        async def handle_client(reader, writer):
-            self.lsp.connection_made(writer)
+        async def handle_client(
+            reader: asyncio.StreamReader, writer: asyncio.StreamWriter
+        ):
+            self.protocol.set_writer(writer)
 
             try:
                 await aio_readline(reader, self.handler)
diff --git a/lib/lsp-devtools/lsp_devtools/client/editor/text_editor.py b/lib/lsp-devtools/lsp_devtools/client/editor/text_editor.py
index ee051c0..38c32ff 100644
--- a/lib/lsp-devtools/lsp_devtools/client/editor/text_editor.py
+++ b/lib/lsp-devtools/lsp_devtools/client/editor/text_editor.py
@@ -103,7 +103,7 @@ def edit(self, edit):
                     version=self.version, uri=self.uri
                 ),
                 content_changes=[
-                    types.TextDocumentContentChangeEvent_Type1(
+                    types.TextDocumentContentChangePartial(
                         text=edit.text,
                         range=types.Range(
                             start=types.Position(line=start_line, character=start_col),
diff --git a/lib/lsp-devtools/pyproject.toml b/lib/lsp-devtools/pyproject.toml
index ed0c787..2452915 100644
--- a/lib/lsp-devtools/pyproject.toml
+++ b/lib/lsp-devtools/pyproject.toml
@@ -24,7 +24,7 @@ classifiers = [
 dependencies = [
   "aiosqlite",
   "platformdirs",
-  "pygls>=1.1.0,<2",
+  "pygls>=2.0a2",
   "stamina",
   "textual>=0.41.0",
 ]
diff --git a/lib/lsp-devtools/tests/servers/simple.py b/lib/lsp-devtools/tests/servers/simple.py
index 6bda60d..582d9cc 100644
--- a/lib/lsp-devtools/tests/servers/simple.py
+++ b/lib/lsp-devtools/tests/servers/simple.py
@@ -1,14 +1,19 @@
 """A very simple language server."""
 
 from lsprotocol import types
-from pygls.server import LanguageServer
+from pygls.lsp.server import LanguageServer
 
 server = LanguageServer("simple-server", "v1")
 
 
 @server.feature(types.INITIALIZED)
 def _(ls: LanguageServer, params: types.InitializedParams):
-    ls.show_message("Hello, world!")
+    ls.window_show_message(
+        types.ShowMessageParams(
+            message="Hello, world!",
+            type=types.MessageType.Log,
+        )
+    )
 
 
 if __name__ == "__main__":