diff --git a/pyproject.toml b/pyproject.toml
index b3b57f6..8e461d5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,25 +1,18 @@
 [build-system]
-requires = ["hatchling"]
+requires = ["hatchling==1.27.0"]
 build-backend = "hatchling.build"
 
 [project]
 name = "endpoint-monitor"
 version = "1.0.0"
 description = "Process-local FastAPI endpoint monitoring service"
-requires-python = ">=3.12"
+readme = "README.md"
+requires-python = ">=3.12,<3.13"
 dependencies = [
-  "fastapi>=0.115,<1",
-  "httpx>=0.27,<1",
-  "pydantic-settings>=2.6,<3",
-  "uvicorn[standard]>=0.32,<1",
-]
-
-[project.optional-dependencies]
-dev = [
-  "mypy>=1.13,<2",
-  "pytest>=8.3,<9",
-  "pytest-anyio>=0.0.0,<1",
-  "ruff>=0.8,<1",
+  "fastapi==0.115.12",
+  "httpx==0.28.1",
+  "pydantic-settings==2.9.1",
+  "uvicorn[standard]==0.34.2",
 ]
 
 [tool.hatch.build.targets.wheel]
@@ -30,8 +23,8 @@ testpaths = ["tests"]
 addopts = "-q"
 
 [tool.ruff]
-line-length = 120
 target-version = "py312"
+line-length = 100
 
 [tool.ruff.lint]
 select = ["E", "F", "I", "B", "UP"]
@@ -39,5 +32,8 @@ select = ["E", "F", "I", "B", "UP"]
 [tool.mypy]
 python_version = "3.12"
 strict = true
-packages = ["app"]
 plugins = ["pydantic.mypy"]
+
+[[tool.mypy.overrides]]
+module = ["tests.*"]
+disallow_untyped_decorators = false