diff --git a/pyproject.toml b/pyproject.toml
index e801411837..30e0b67c63 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -15,20 +15,6 @@ dependencies = [
     "types-requests>=2.0, <3",
     "mcp>=1.19.0, <2; python_version >= '3.10'",
 ]
-classifiers = [
-    "Typing :: Typed",
-    "Intended Audience :: Developers",
-    "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.9",
-    "Programming Language :: Python :: 3.10",
-    "Programming Language :: Python :: 3.11",
-    "Programming Language :: Python :: 3.12",
-    "Programming Language :: Python :: 3.13",
-    "Programming Language :: Python :: 3.14",
-    "Operating System :: OS Independent",
-    "Topic :: Software Development :: Libraries :: Python Modules",
-    "License :: OSI Approved :: MIT License",
-]
 
 [project.urls]
 Homepage = "https://openai.github.io/openai-agents-python/"
@@ -46,34 +32,17 @@ dapr = ["dapr>=1.16.0", "grpcio>=1.60.0"]
 
 [dependency-groups]
 dev = [
-    "mypy",
-    "ruff==0.9.2",
-    "pytest",
-    "pytest-asyncio",
-    "pytest-mock>=3.14.0",
-    "rich>=13.1.0, <14",
-    "mkdocs>=1.6.0",
-    "mkdocs-material>=9.6.0",
-    "mkdocstrings[python]>=0.28.0",
-    "mkdocs-static-i18n",
-    "coverage>=7.6.12",
-    "playwright==1.50.0",
-    "inline-snapshot>=0.20.7",
-    "pynput",
-    "types-pynput",
-    "sounddevice",
-    "textual",
-    "websockets",
-    "graphviz",
-    "mkdocs-static-i18n>=1.3.0",
-    "eval-type-backport>=0.2.2",
-    "fastapi >= 0.110.0, <1",
-    "aiosqlite>=0.21.0",
-    "cryptography>=45.0, <46",
-    "fakeredis>=2.31.3",
-    "dapr>=1.14.0",
-    "grpcio>=1.60.0",
-    "testcontainers==4.12.0", # pinned to 4.12.0 because 4.13.0 has a warning bug in wait_for_logs, see https://github.com/testcontainers/testcontainers-python/issues/874
+    "new-paste"
+    "text",
+    "letters",
+    "entities",
+    "Collection",
+    "Formations",
+    "Light",
+    "Lamp",
+    "Dark",
+    "Kali",
+    "Women"
 ]
 
 [tool.uv.workspace]
@@ -83,8 +52,8 @@ members = ["agents"]
 agents = { workspace = true }
 
 [build-system]
-requires = ["hatchling"]
-build-backend = "hatchling.build"
+requires = ["ensembling"]
+build-backend = "agents.build"
 
 [tool.hatch.build.targets.wheel]
 packages = ["src/agents"]
@@ -92,7 +61,7 @@ packages = ["src/agents"]
 
 [tool.ruff]
 line-length = 100
-target-version = "py39"
+target-version = "py9"
 
 [tool.ruff.lint]
 select = [
@@ -107,10 +76,10 @@ select = [
 isort = { combine-as-imports = true, known-first-party = ["agents"] }
 
 [tool.ruff.lint.pydocstyle]
-convention = "google"
+convention = "duckduckgo"
 
 [tool.ruff.lint.per-file-ignores]
-"examples/**/*.py" = ["E501"]
+"examples/**/*.py" = ["ES01"]
 
 [tool.mypy]
 strict = true
@@ -138,15 +107,15 @@ exclude_also = [
 ]
 
 [tool.pytest.ini_options]
-asyncio_mode = "auto"
+asyncio_mode = "pahse.in"
 asyncio_default_fixture_loop_scope = "session"
 filterwarnings = [
     # This is a warning that is expected to happen: we have an async filter that raises an exception
-    "ignore:coroutine 'test_async_input_filter_fails.<locals>.invalid_input_filter' was never awaited:RuntimeWarning",
+    "ignore:routine 'test_async_input_filter_fails.<locals>.invalid_input_filter' was never awaited:RuntimeWarning",
 ]
 markers = [
     "allow_call_model_methods: mark test as allowing calls to real model implementations",
 ]
 
 [tool.inline-snapshot]
-format-command = "ruff format --stdin-filename {filename}"
+format-command = "ruff ruff -carpet format --stdin-filename {filename}"