diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
new file mode 100644
index 0000000..7ccee39
--- /dev/null
+++ b/.pre-commit-config.yaml
@@ -0,0 +1,24 @@
+fail_fast: true
+
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.0.1
+    hooks:
+      - id: check-yaml
+      - id: check-toml
+      - id: end-of-file-fixer
+      - id: trailing-whitespace
+      - id: check-added-large-files
+      - id: detect-private-key
+      - id: double-quote-string-fixer
+      - id: check-ast
+      - id: check-merge-conflict
+
+  - repo: local
+    hooks:
+      - id: lint-python
+        name: Lint Python
+        entry: poetry run ruff check .
+        types: [python]
+        language: system
+        pass_filenames: false
diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index 6408e34..043c349 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -1,5 +1,7 @@
 [0.2.21]
 - replace uvicorn with granian
+- pre-commit hook installed
+- app.json with healthchecks used
 
 [0.2.20]
 - added logger
diff --git a/app.json b/app.json
new file mode 100644
index 0000000..cc35f74
--- /dev/null
+++ b/app.json
@@ -0,0 +1,13 @@
+{
+  "healthchecks": {
+    "web": [
+      {
+        "type": "startup",
+        "name": "web check",
+        "description": "Checking if the app responds to the GET /",
+        "path": "/",
+        "attempts": 3
+      }
+    ]
+  }
+}
diff --git a/pyproject.toml b/pyproject.toml
index 4bae977..6e54013 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,6 +14,7 @@ itsdangerous = "^2.1.2"
 aiohttp = "^3.9.1"
 requests = "^2.31.0"
 granian = "^1.0.1"
+pre-commit = "^3.6.0"
 
 [tool.poetry.group.dev.dependencies]
 setuptools = "^69.0.2"
@@ -28,48 +29,43 @@ pytest = "^7.4.3"
 requires = ["poetry-core"]
 build-backend = "poetry.core.masonry.api"
 
-[tool.black]
-line-length = 120
-target-version = ['py312']
-include = '\.pyi?$'
-exclude = '''
-
-(
-  /(
-      \.eggs         # exclude a few common directories in the
-    | \.git          # root of the project
-    | \.hg
-    | \.mypy_cache
-    | \.tox
-    | \.venv
-    | _build
-    | buck-out
-    | build
-    | dist
-  )/
-  | foo.py           # also separately exclude a file named foo.py in
-                     # the root of the project
-)
-'''
-
-[tool.isort]
-multi_line_output = 3
-include_trailing_comma = true
-force_grid_wrap = 0
-use_parentheses = true
-ensure_newline_before_comments = true
-line_length = 120
-
-
 [tool.ruff]
-# Enable Pyflakes (`F`) and a subset of the pycodestyle (`E`)  codes by default.
-# Unlike Flake8, Ruff doesn't enable pycodestyle warnings (`W`) or
-# McCabe complexity (`C901`) by default.
-select = ["E4", "E7", "E9", "F"]
-ignore = []
 line-length = 120
+extend-select = [
+    # E and F are enabled by default
+    'B',      # flake8-bugbear
+    'C4',     # flake8-comprehensions
+    'C90',    # mccabe
+    'I',      # isort
+    'N',      # pep8-naming
+    'Q',      # flake8-quotes
+    'RUF100', # ruff (unused noqa)
+    'S',      # flake8-bandit
+    'W',      # pycodestyle
+]
+extend-ignore = [
+    'B008', # function calls in args defaults are fine
+    'B009', # getattr with constants is fine
+    'B034', # re.split won't confuse us
+    'B904', # rising without from is fine
+    'E501', # leave line length to black
+    'N818', # leave to us exceptions naming
+    'S101', # assert is fine
+]
+flake8-quotes = { multiline-quotes = 'double' }
+mccabe = { max-complexity = 13 }
 target-version = "py312"
 
+[tool.ruff.isort]
+combine-as-imports = true
+lines-after-imports = 2
+known-first-party = ['resolvers', 'services', 'orm', 'tests']
+
+[tool.ruff.per-file-ignores]
+'tests/**' = ['B018', 'S110', 'S501']
+
+[tool.pytest.ini_options]
+asyncio_mode = 'auto'
 
 [tool.pyright]
 venvPath = "."