diff --git a/python/README.md b/python/README.md
index b8a436ea..0db03f17 100644
--- a/python/README.md
+++ b/python/README.md
@@ -7,9 +7,9 @@ Python SDK for programmatic control of GitHub Copilot CLI via JSON-RPC.
 ## Installation
 
 ```bash
-pip install -e ".[dev]"
+pip install -e . --group dev
 # or
-uv pip install -e ".[dev]"
+uv sync
 ```
 
 ## Quick Start
diff --git a/python/pyproject.toml b/python/pyproject.toml
index 3a724120..5a94f4da 100644
--- a/python/pyproject.toml
+++ b/python/pyproject.toml
@@ -36,7 +36,7 @@ Repository = "https://github.com/github/copilot-sdk"
 where = ["."]
 include = ["copilot*"]
 
-[project.optional-dependencies]
+[dependency-groups]
 dev = [
     "ruff>=0.1.0",
     "ty>=0.0.2",
diff --git a/python/uv.lock b/python/uv.lock
index 1c1dfb58..5653a552 100644
--- a/python/uv.lock
+++ b/python/uv.lock
@@ -78,7 +78,7 @@ dependencies = [
     { name = "typing-extensions" },
 ]
 
-[package.optional-dependencies]
+[package.dev-dependencies]
 dev = [
     { name = "httpx" },
     { name = "pytest", version = "8.4.2", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.10'" },
@@ -92,17 +92,20 @@ dev = [
 
 [package.metadata]
 requires-dist = [
-    { name = "httpx", marker = "extra == 'dev'", specifier = ">=0.24.0" },
     { name = "pydantic", specifier = ">=2.0" },
-    { name = "pytest", marker = "extra == 'dev'", specifier = ">=7.0.0" },
-    { name = "pytest-asyncio", marker = "extra == 'dev'", specifier = ">=0.21.0" },
     { name = "python-dateutil", specifier = ">=2.9.0.post0" },
-    { name = "ruff", marker = "extra == 'dev'", specifier = ">=0.1.0" },
-    { name = "ty", marker = "extra == 'dev'", specifier = ">=0.0.2" },
     { name = "typing-extensions", specifier = ">=4.0.0" },
-    { name = "typing-extensions", marker = "extra == 'dev'", specifier = ">=4.0.0" },
 ]
-provides-extras = ["dev"]
+
+[package.metadata.requires-dev]
+dev = [
+    { name = "httpx", specifier = ">=0.24.0" },
+    { name = "pytest", specifier = ">=7.0.0" },
+    { name = "pytest-asyncio", specifier = ">=0.21.0" },
+    { name = "ruff", specifier = ">=0.1.0" },
+    { name = "ty", specifier = ">=0.0.2" },
+    { name = "typing-extensions", specifier = ">=4.0.0" },
+]
 
 [[package]]
 name = "h11"