diff --git a/DEVELOPMENT.md b/DEVELOPMENT.md
index ff92327..f1fd95a 100644
--- a/DEVELOPMENT.md
+++ b/DEVELOPMENT.md
@@ -45,7 +45,7 @@ uv run poe test-conformance
 We use:
 
 - **ruff** for linting and formatting
-- **pyright** for type checking
+- **ty** for type checking
 - **pytest** for testing
 
 The project follows strict type checking and formatting standards.
diff --git a/README.md b/README.md
index 6250fb8..59e66fa 100644
--- a/README.md
+++ b/README.md
@@ -398,7 +398,7 @@ service YourService {
 
 ## Development
 
-We use `ruff` for linting and formatting, `pyright` for type checking, and `tombi` for TOML linting and formatting.
+We use `ruff` for linting and formatting, `ty` for type checking, and `tombi` for TOML linting and formatting.
 
 We rely on the conformance test suit (in
 [./conformance](./conformance)) to verify behavior.
diff --git a/conformance/test/__init__.py b/conformance/test/__init__.py
deleted file mode 100644
index e69de29..0000000
diff --git a/conformance/test/_util.py b/conformance/test/_util.py
index faea3e2..7b221ae 100644
--- a/conformance/test/_util.py
+++ b/conformance/test/_util.py
@@ -28,7 +28,7 @@ def maybe_patch_args_with_debug(args: list[str]) -> list[str]:
     # This invokes internal methods from bundles provided by the IDE
     # and may not always work.
     try:
-        from pydevd import (  # pyright:ignore[reportMissingImports] - provided by IDE  # noqa: PLC0415
+        from pydevd import (  # ty: ignore[unresolved-import] - provided by IDE  # noqa: PLC0415
             _pydev_bundle,
         )
 
diff --git a/conformance/test/test_client.py b/conformance/test/test_client.py
index 89395da..99e9c97 100644
--- a/conformance/test/test_client.py
+++ b/conformance/test/test_client.py
@@ -6,8 +6,7 @@
 from typing import TYPE_CHECKING
 
 import pytest
-
-from ._util import VERSION_CONFORMANCE, coverage_env, maybe_patch_args_with_debug
+from _util import VERSION_CONFORMANCE, coverage_env, maybe_patch_args_with_debug
 
 if TYPE_CHECKING:
     from coverage import Coverage
diff --git a/conformance/test/test_server.py b/conformance/test/test_server.py
index 20fec15..06f2ce5 100644
--- a/conformance/test/test_server.py
+++ b/conformance/test/test_server.py
@@ -7,8 +7,7 @@
 from typing import TYPE_CHECKING
 
 import pytest
-
-from ._util import VERSION_CONFORMANCE, coverage_env, maybe_patch_args_with_debug
+from _util import VERSION_CONFORMANCE, coverage_env, maybe_patch_args_with_debug
 
 if TYPE_CHECKING:
     from coverage import Coverage
diff --git a/example/example/eliza_service_sync.py b/example/example/eliza_service_sync.py
index 2477bee..38d2259 100644
--- a/example/example/eliza_service_sync.py
+++ b/example/example/eliza_service_sync.py
@@ -67,4 +67,4 @@ def health_check():
 
 eliza_app = ElizaServiceWSGIApplication(DemoElizaServiceSync())
 
-app.wsgi_app = DispatcherMiddleware(app.wsgi_app, {eliza_app.path: eliza_app})
+app.wsgi_app = DispatcherMiddleware(app.wsgi_app, {eliza_app.path: eliza_app})  # ty: ignore[invalid-assignment]
diff --git a/poe_tasks.toml b/poe_tasks.toml
index 6b12387..7e7ae00 100644
--- a/poe_tasks.toml
+++ b/poe_tasks.toml
@@ -95,7 +95,7 @@ cmd = "tombi lint"
 
 [tasks.lint-types]
 help = "Apply type checking to Python files"
-cmd = "pyright"
+cmd = "ty check ."
 
 [tasks.test]
 help = "Run unit tests"
diff --git a/pyproject.toml b/pyproject.toml
index b280a42..ed2e470 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -47,10 +47,12 @@ dev = [
   "gunicorn==25.3.0",
   "hypercorn==0.18.0",
   "poethepoet==0.45.0",
-  "pyright[nodejs]==1.1.409",
   "pyvoy==0.3.0",
   "ruff==0.15.12",
   "tombi==0.10.2",
+  "ty==0.0.34",
+  "types-grpcio==1.0.0.20260408",
+  "types-protobuf==7.34.1.20260503",
   "typing_extensions==4.15.0",
   "uvicorn==0.46.0",
   "zstandard==0.25.0",
@@ -79,30 +81,6 @@ docs = ["mkdocstrings-python==2.0.3", "zensical==0.0.39"]
 requires = ["uv_build>=0.11.0,<0.12.0"]
 build-backend = "uv_build"
 
-[tool.pyright]
-exclude = [
-  # Defaults.
-  "**/node_modules",
-  "**/__pycache__",
-  "**/.*",
-  ".venv",
-
-  # Recent versions of typeshed fail on 5.x gencode.
-  # https://github.com/python/typeshed/pull/15677
-  "**/*_pb.py",
-
-  # Recent versions of typeshed have improved typing of functions that then expose
-  # type errors for accessing
-  "**/*_pb2.py",
-
-  # GRPC python files don't typecheck on their own.
-  # See https://github.com/grpc/grpc/issues/39555
-  "**/*_pb2_grpc.py",
-
-  # TODO: Work out the import issues to allow it to work.
-  "conformance/**",
-]
-
 [tool.pytest]
 # Turn all warnings into errors
 filterwarnings = ["error"]
@@ -250,6 +228,19 @@ typing-extensions = false
 required-imports = ["from __future__ import annotations"]
 split-on-trailing-comma = false
 
+[tool.ty.src]
+exclude = [
+  # gRPC generated code references `grpc.experimental`, which is not exposed by the
+  # `grpc` package's public API. See https://github.com/grpc/grpc/issues/39555.
+  "**/*_pb2_grpc.py",
+]
+
+[tool.ty.environment]
+# Conformance test files import generated code as `from gen.connectrpc...` and
+# sibling modules like `_util`/`_cov_embed`. Pytest and the launched server/client
+# subprocesses put `conformance/test/` on sys.path; teach ty to do the same.
+extra-paths = ["conformance/test"]
+
 [tool.uv]
 constraint-dependencies = [
   "coverage==7.13.2",
diff --git a/src/connectrpc/_asyncio_timeout.py b/src/connectrpc/_asyncio_timeout.py
index 5f60385..3c68bdc 100644
--- a/src/connectrpc/_asyncio_timeout.py
+++ b/src/connectrpc/_asyncio_timeout.py
@@ -119,8 +119,8 @@ async def __aexit__(
                     raise TimeoutError from exc_val
                 if exc_val is not None:
                     self._insert_timeout_error(exc_val)
-                    if _HAX_EXCEPTION_GROUP and isinstance(exc_val, ExceptionGroup):  # pyright: ignore[reportUndefinedVariable] # noqa: F821
-                        for exc in exc_val.exceptions:  # pyright: ignore[reportAttributeAccessIssue]
+                    if _HAX_EXCEPTION_GROUP and isinstance(exc_val, ExceptionGroup):  # noqa: F821
+                        for exc in exc_val.exceptions:
                             self._insert_timeout_error(exc)
         elif self._state is _State.ENTERED:
             self._state = _State.EXITED
diff --git a/src/connectrpc/_client_async.py b/src/connectrpc/_client_async.py
index 32c44a0..a3c3a04 100644
--- a/src/connectrpc/_client_async.py
+++ b/src/connectrpc/_client_async.py
@@ -2,6 +2,7 @@
 
 import asyncio
 import functools
+import sys
 from asyncio import CancelledError, sleep, wait_for
 from typing import TYPE_CHECKING, Any, Protocol, TypeVar
 from urllib.parse import urlencode
@@ -11,7 +12,6 @@
 from pyqwest import Headers as HTTPHeaders
 
 from . import _client_shared
-from ._asyncio_timeout import timeout as asyncio_timeout
 from ._codec import proto_binary_codec
 from ._compression import IdentityCompression, _gzip, resolve_compressions
 from ._interceptor_async import (
@@ -30,15 +30,12 @@
 from .errors import ConnectError
 from .protocol import ProtocolType
 
-try:
-    from asyncio import (
-        timeout as asyncio_timeout,  # pyright: ignore[reportAttributeAccessIssue]
-    )
-except ImportError:
+if sys.version_info >= (3, 11):
+    from asyncio import timeout as asyncio_timeout
+else:
     from ._asyncio_timeout import timeout as asyncio_timeout
 
 if TYPE_CHECKING:
-    import sys
     from collections.abc import AsyncIterator, Iterable, Mapping
     from types import TracebackType
 
diff --git a/src/connectrpc/_codec.py b/src/connectrpc/_codec.py
index 864cdb8..5c5b374 100644
--- a/src/connectrpc/_codec.py
+++ b/src/connectrpc/_codec.py
@@ -33,7 +33,7 @@ def decode(self, data: bytes | bytearray, message: U) -> U:
 
 
 class ProtoBinaryCodec(Codec[Message, V]):
-    """Codec for Protocol bytes | bytearrays binary format."""
+    """Codec for the Protocol Buffers binary format."""
 
     def name(self) -> str:
         return "proto"
@@ -42,12 +42,16 @@ def encode(self, message: Message) -> bytes:
         return message.SerializeToString()
 
     def decode(self, data: bytes | bytearray, message: V) -> V:
-        message.ParseFromString(data)  # pyright: ignore[reportArgumentType] - type is incorrect
+        # ParseFromString accepts the buffer protocol at runtime, but typeshed
+        # declares only `bytes`. Skipping the conversion avoids a copy on the
+        # streaming decode path (see _envelope.py). Tracked upstream in
+        # https://github.com/python/typeshed/issues/9006.
+        message.ParseFromString(data)  # ty: ignore[invalid-argument-type]
         return message
 
 
 class ProtoJSONCodec(Codec[Message, V]):
-    """Codec for Protocol bytes | bytearrays JSON format."""
+    """Codec for the Protocol Buffers JSON format."""
 
     def __init__(self, name: str = "json") -> None:
         self._name = name
@@ -59,13 +63,16 @@ def encode(self, message: Message) -> bytes:
         return MessageToJson(message).encode()
 
     def decode(self, data: bytes | bytearray, message: V) -> V:
-        MessageFromJson(data, message)  # pyright: ignore[reportArgumentType] - type is incorrect
+        # google.protobuf.json_format.Parse accepts the buffer protocol at
+        # runtime, but typeshed declares only `bytes | str`. See
+        # ProtoBinaryCodec.decode for the upstream tracking issue.
+        MessageFromJson(data, message)  # ty: ignore[invalid-argument-type]
         return message
 
 
 _proto_binary_codec = ProtoBinaryCodec()
 _proto_json_codec = ProtoJSONCodec()
-_default_codecs = [_proto_binary_codec, _proto_json_codec]
+_default_codecs: list[Codec] = [_proto_binary_codec, _proto_json_codec]
 
 
 def get_default_codecs() -> list[Codec]:
diff --git a/src/connectrpc/_headers.py b/src/connectrpc/_headers.py
index 9ffb7a1..092d8d7 100644
--- a/src/connectrpc/_headers.py
+++ b/src/connectrpc/_headers.py
@@ -9,6 +9,7 @@
     Sequence,
     ValuesView,
 )
+from typing import cast
 
 
 class Headers(MutableMapping[str, str]):
@@ -28,6 +29,10 @@ def __init__(
     ) -> None:
         self._extra = None
         if isinstance(items, Mapping):
+            # ty does not preserve type parameters when narrowing a union via
+            # `isinstance(x, Mapping)`, so we re-assert `Mapping[str, str]`.
+            # See https://github.com/astral-sh/ty/issues/456.
+            items = cast("Mapping[str, str]", items)
             self._store = {k.lower(): v for k, v in items.items()}
         else:
             self._store = {}
diff --git a/src/connectrpc/_protocol_grpc.py b/src/connectrpc/_protocol_grpc.py
index 0b98948..06afe35 100644
--- a/src/connectrpc/_protocol_grpc.py
+++ b/src/connectrpc/_protocol_grpc.py
@@ -181,7 +181,7 @@ def end(self, user_trailers: Headers, error: ConnectWireError | None) -> Headers
 
 
 class GRPCWebEnvelopeWriter(GRPCEnvelopeWriter):
-    def end(self, user_trailers: Headers, error: ConnectWireError | None) -> bytes:  # pyright: ignore[reportIncompatibleMethodOverride]
+    def end(self, user_trailers: Headers, error: ConnectWireError | None) -> bytes:  # ty: ignore[invalid-method-override]
         trailers = super().end(user_trailers, error)
         data = "".join(f"{k}: {v}\r\n" for k, v in trailers.allitems()).encode()
         if self._compression:
diff --git a/uv.lock b/uv.lock
index 120ddba..da7ee57 100644
--- a/uv.lock
+++ b/uv.lock
@@ -1,10 +1,6 @@
 version = 1
 revision = 3
 requires-python = ">=3.10"
-resolution-markers = [
-    "python_full_version >= '3.11'",
-    "python_full_version < '3.11'",
-]
 
 [manifest]
 members = [
@@ -202,7 +198,6 @@ dev = [
     { name = "opentelemetry-instrumentation-wsgi" },
     { name = "opentelemetry-sdk" },
     { name = "poethepoet" },
-    { name = "pyright", extra = ["nodejs"] },
     { name = "pytest" },
     { name = "pytest-asyncio" },
     { name = "pytest-cov" },
@@ -210,6 +205,9 @@ dev = [
     { name = "pyvoy" },
     { name = "ruff" },
     { name = "tombi" },
+    { name = "ty" },
+    { name = "types-grpcio" },
+    { name = "types-protobuf" },
     { name = "typing-extensions" },
     { name = "uvicorn" },
     { name = "zstandard" },
@@ -239,7 +237,6 @@ dev = [
     { name = "opentelemetry-instrumentation-wsgi", specifier = "==0.62b1" },
     { name = "opentelemetry-sdk", specifier = "==1.41.1" },
     { name = "poethepoet", specifier = "==0.45.0" },
-    { name = "pyright", extras = ["nodejs"], specifier = "==1.1.409" },
     { name = "pytest" },
     { name = "pytest-asyncio" },
     { name = "pytest-cov" },
@@ -247,6 +244,9 @@ dev = [
     { name = "pyvoy", specifier = "==0.3.0" },
     { name = "ruff", specifier = "==0.15.12" },
     { name = "tombi", specifier = "==0.10.2" },
+    { name = "ty", specifier = "==0.0.34" },
+    { name = "types-grpcio", specifier = "==1.0.0.20260408" },
+    { name = "types-protobuf", specifier = "==7.34.1.20260503" },
     { name = "typing-extensions", specifier = "==4.15.0" },
     { name = "uvicorn", specifier = "==0.46.0" },
     { name = "zstandard", specifier = "==0.25.0" },
@@ -414,7 +414,7 @@ name = "exceptiongroup"
 version = "1.3.1"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "typing-extensions", marker = "python_full_version < '3.11'" },
+    { name = "typing-extensions", marker = "python_full_version < '3.13'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/50/79/66800aadf48771f6b62f7eb014e352e5d06856655206165d775e675a02c9/exceptiongroup-1.3.1.tar.gz", hash = "sha256:8b412432c6055b0b7d14c310000ae93352ed6754f70fa8f7c34141f91c4e3219", size = 30371, upload-time = "2025-11-21T23:01:54.787Z" }
 wheels = [
@@ -990,31 +990,6 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/32/28/79f0f8de97cce916d5ae88a7bee1ad724855e83e6019c0b4d5b3fabc80f3/mkdocstrings_python-2.0.3-py3-none-any.whl", hash = "sha256:0b83513478bdfd803ff05aa43e9b1fca9dd22bcd9471f09ca6257f009bc5ee12", size = 104779, upload-time = "2026-02-20T10:38:34.517Z" },
 ]
 
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-name = "nodeenv"
-version = "1.10.0"
-source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/24/bf/d1bda4f6168e0b2e9e5958945e01910052158313224ada5ce1fb2e1113b8/nodeenv-1.10.0.tar.gz", hash = "sha256:996c191ad80897d076bdfba80a41994c2b47c68e224c542b48feba42ba00f8bb", size = 55611, upload-time = "2025-12-20T14:08:54.006Z" }
-wheels = [
-    { url = "https://files.pythonhosted.org/packages/88/b2/d0896bdcdc8d28a7fc5717c305f1a861c26e18c05047949fb371034d98bd/nodeenv-1.10.0-py2.py3-none-any.whl", hash = "sha256:5bb13e3eed2923615535339b3c620e76779af4cb4c6a90deccc9e36b274d3827", size = 23438, upload-time = "2025-12-20T14:08:52.782Z" },
-]
-
-[[package]]
-name = "nodejs-wheel-binaries"
-version = "24.15.0"
-source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/3f/70/a1e4f4d5986768ab90cc860b1cc3660fd2ded74ca175a900a5c29f839c7d/nodejs_wheel_binaries-24.15.0.tar.gz", hash = "sha256:b43f5c4f6e5768d8845b2ae4682eb703a19bf7aadc84187e2d903ed3a611c859", size = 8057, upload-time = "2026-04-19T15:48:16.899Z" }
-wheels = [
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-]
-
 [[package]]
 name = "opentelemetry-api"
 version = "1.41.1"
@@ -1171,11 +1146,11 @@ wheels = [
 
 [[package]]
 name = "priority"
-version = "1.3.0"
+version = "2.0.0"
 source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/ba/96/7d0b024087062418dfe02a68cd6b195399266ac002fb517aad94cc93e076/priority-1.3.0.tar.gz", hash = "sha256:6bc1961a6d7fcacbfc337769f1a382c8e746566aaa365e78047abe9f66b2ffbe", size = 13827, upload-time = "2017-01-27T11:00:54.22Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/f5/3c/eb7c35f4dcede96fca1842dac5f4f5d15511aa4b52f3a961219e68ae9204/priority-2.0.0.tar.gz", hash = "sha256:c965d54f1b8d0d0b19479db3924c7c36cf672dbf2aec92d43fbdaf4492ba18c0", size = 24792, upload-time = "2021-06-27T10:15:05.487Z" }
 wheels = [
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+    { url = "https://files.pythonhosted.org/packages/5e/5f/82c8074f7e84978129347c2c6ec8b6c59f3584ff1a20bc3c940a3e061790/priority-2.0.0-py3-none-any.whl", hash = "sha256:6f8eefce5f3ad59baf2c080a664037bb4725cd0a790d53d59ab4059288faf6aa", size = 8946, upload-time = "2021-06-27T10:15:03.856Z" },
 ]
 
 [[package]]
@@ -1262,24 +1237,6 @@ wheels = [
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 ]
 
-[[package]]
-name = "pyright"
-version = "1.1.409"
-source = { registry = "https://pypi.org/simple" }
-dependencies = [
-    { name = "nodeenv" },
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