diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
new file mode 100644
index 0000000..89ad1cd
--- /dev/null
+++ b/.pre-commit-config.yaml
@@ -0,0 +1,131 @@
+---
+minimum_pre_commit_version: 1.21.0
+fail_fast: false
+default_stages: [commit, push]
+repos:
+  # meta
+
+  - repo: meta
+    hooks:
+      - id: check-hooks-apply
+      - id: check-useless-excludes
+
+  # formatters
+
+  - repo: https://github.com/asottile/reorder_python_imports
+    rev: v1.9.0
+    hooks:
+      - id: reorder-python-imports
+
+  - repo: https://github.com/ambv/black
+    rev: 19.10b0
+    hooks:
+      - id: black
+
+  #  - repo: https://github.com/pre-commit/mirrors-yapf
+  #    rev: v0.28.0
+  #    hooks:
+  #      - id: yapf
+
+  - repo: https://github.com/asottile/pyupgrade
+    rev: v1.26.0
+    hooks:
+      - id: pyupgrade
+        stages: [push]
+
+  # linters
+
+  - repo: https://github.com/PyCQA/bandit
+    rev: 1.6.2
+    hooks:
+      - id: bandit
+        args: ["-x", "tests"]
+        stages: [push]
+
+  - repo: https://github.com/PyCQA/pydocstyle
+    rev: 5.0.2
+    hooks:
+      - id: pydocstyle
+        args: ["--ignore=D10,D21,D202"]
+
+
+  - repo: local
+    hooks:
+
+      - id: safety
+        name: safety
+        entry: safety
+        language: system
+        pass_filenames: false
+        args: ["check", "--bare"]
+        stages: [push]
+
+      - id: poetry
+        name: poetry
+        description: Validates the structure of the pyproject.toml file
+        entry: poetry check
+        language: system
+        pass_filenames: false
+        files: ^pyproject.toml$
+        stages: [push]
+
+  - repo: https://github.com/adrienverge/yamllint
+    rev: v1.20.0
+    hooks:
+      - id: yamllint
+        args: ["--strict", "-d", "{rules: {line-length: {max: 180}}}"]
+        #
+        exclude: >
+            (?x)^(
+                ^{{.*}}.*\.yaml$|
+                ^helm-chart/templates/.*$
+            )
+        #
+
+  - repo: https://github.com/pre-commit/mirrors-mypy
+    rev: v0.761
+    hooks:
+      - id: mypy
+
+  - repo: https://github.com/pryorda/dockerfilelint-precommit-hooks
+    rev: v0.1.0
+    hooks:
+      - id: dockerfilelint
+        stages: [commit]  # required
+
+  # miscellaneous
+
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v2.4.0
+    hooks:
+      - id: check-added-large-files
+      - id: check-docstring-first
+      - id: debug-statements
+      - id: end-of-file-fixer
+      - id: flake8
+        additional_dependencies: ["flake8-bugbear"]
+      - id: trailing-whitespace
+      - id: check-ast
+      - id: check-builtin-literals
+      - id: detect-private-key
+      - id: mixed-line-ending
+      - id: name-tests-test
+        args: ["--django"]
+
+  - repo: https://github.com/pre-commit/pygrep-hooks
+    rev: v1.4.4
+    hooks:
+      #      - id: rst-backticks
+      - id: python-use-type-annotations
+      - id: python-no-log-warn
+      - id: python-no-eval
+      - id: python-check-mock-methods
+      - id: python-check-blanket-noqa
+
+  # commit-msg
+  # http://jorisroovers.com/gitlint/#using-gitlint-through-pre-commit
+
+  - repo: https://github.com/jorisroovers/gitlint
+    rev:  v0.12.0
+    hooks:
+      - id: gitlint
diff --git a/Makefile b/Makefile
index 2394523..6d5c23b 100644
--- a/Makefile
+++ b/Makefile
@@ -10,14 +10,16 @@ default: docker
 install:
 	poetry install
 
-test: install
-	poetry run flake8
-	poetry run black --check kube_downscaler
-	poetry run mypy --ignore-missing-imports kube_downscaler
+.PHONY: lint
+lint: install
+	poetry run pre-commit run --all-files
+
+
+test: lint install
 	poetry run coverage run --source=kube_downscaler -m py.test -v
 	poetry run coverage report
 
-docker: 
+docker:
 	docker build --build-arg "VERSION=$(VERSION)" -t "$(IMAGE):$(TAG)" .
 	@echo 'Docker image $(IMAGE):$(TAG) can now be used.'
 
diff --git a/helm-chart/CHANGELOG.md b/helm-chart/CHANGELOG.md
index 82b277d..5aff7d8 100644
--- a/helm-chart/CHANGELOG.md
+++ b/helm-chart/CHANGELOG.md
@@ -1,4 +1,3 @@
 0.1.0 - 10/03/2018
 ---
 - Initial chart
-
diff --git a/helm-chart/Chart.yaml b/helm-chart/Chart.yaml
index 4d7ad48..87991c1 100644
--- a/helm-chart/Chart.yaml
+++ b/helm-chart/Chart.yaml
@@ -8,4 +8,3 @@ keywords:
 - scheduled lifecycle
 sources:
 - https://github.com/hjacobs/kube-downscaler
-
diff --git a/helm-chart/README.md b/helm-chart/README.md
index 9530b45..f0ff22b 100644
--- a/helm-chart/README.md
+++ b/helm-chart/README.md
@@ -17,7 +17,7 @@ The diagram below depicts how a Kube-downscaler agent control applications.
 ![Alt text](images/architecture.png?raw=true "Kube Kube-downscaler diagram")
 
 ## Quick Start
-Below are instructions to quickly install and configure Kube-downscaler.  
+Below are instructions to quickly install and configure Kube-downscaler.
 
 ### Installing Kube-downscaler
 
@@ -66,7 +66,7 @@ kubectl get events -w
 
 
 ### Deploying sample applications using Kube-downscaler
-In this tutorial we will show how to deploy Kube-downscaler and test with sample Flask application. 
+In this tutorial we will show how to deploy Kube-downscaler and test with sample Flask application.
 
 1. Deploy Flask applications:
 ```
diff --git a/kube_downscaler/cmd.py b/kube_downscaler/cmd.py
index 053593b..d7aff7a 100644
--- a/kube_downscaler/cmd.py
+++ b/kube_downscaler/cmd.py
@@ -1,6 +1,5 @@
-import os
-
 import argparse
+import os
 
 VALID_RESOURCES = frozenset(["deployments", "statefulsets", "stacks", "cronjobs"])
 
diff --git a/kube_downscaler/helper.py b/kube_downscaler/helper.py
index 48c214a..6e09355 100644
--- a/kube_downscaler/helper.py
+++ b/kube_downscaler/helper.py
@@ -1,9 +1,10 @@
+import datetime
 import os
+import re
+from typing import Match
 
-import datetime
 import pykube
 import pytz
-import re
 
 WEEKDAYS = ["MON", "TUE", "WED", "THU", "FRI", "SAT", "SUN"]
 
@@ -39,7 +40,7 @@ def matches_time_spec(time: datetime.datetime, spec: str):
     return False
 
 
-def _matches_recurring_time_spec(time: datetime.datetime, match: re.Match):
+def _matches_recurring_time_spec(time: datetime.datetime, match: Match):
     tz = pytz.timezone(match.group("tz"))
     local_time = tz.fromutc(time.replace(tzinfo=tz))
     day_from = WEEKDAYS.index(match.group(1).upper())
@@ -52,7 +53,7 @@ def _matches_recurring_time_spec(time: datetime.datetime, match: re.Match):
     return day_matches and time_matches
 
 
-def _matches_absolute_time_spec(time: datetime.datetime, match: re.Match):
+def _matches_absolute_time_spec(time: datetime.datetime, match: Match):
     time_from = datetime.datetime.fromisoformat(match.group(1))
     time_to = datetime.datetime.fromisoformat(match.group(2))
     return time_from <= time <= time_to
diff --git a/kube_downscaler/main.py b/kube_downscaler/main.py
index 2c52660..903e0e6 100755
--- a/kube_downscaler/main.py
+++ b/kube_downscaler/main.py
@@ -1,10 +1,10 @@
 #!/usr/bin/env python3
-
-import time
-
 import logging
+import time
 
-from kube_downscaler import __version__, cmd, shutdown
+from kube_downscaler import __version__
+from kube_downscaler import cmd
+from kube_downscaler import shutdown
 from kube_downscaler.scaler import scale
 
 logger = logging.getLogger("downscaler")
diff --git a/kube_downscaler/resources/stack.py b/kube_downscaler/resources/stack.py
index a79b5ca..0de5b9c 100644
--- a/kube_downscaler/resources/stack.py
+++ b/kube_downscaler/resources/stack.py
@@ -1,10 +1,11 @@
-from pykube.objects import NamespacedAPIObject, ReplicatedMixin, ScalableMixin
+from pykube.objects import NamespacedAPIObject
+from pykube.objects import ReplicatedMixin
+from pykube.objects import ScalableMixin
 
 
 class Stack(NamespacedAPIObject, ReplicatedMixin, ScalableMixin):
-    """
-    Support the Stack resource (https://github.com/zalando-incubator/stackset-controller)
-    """
+
+    """Support the Stack resource (https://github.com/zalando-incubator/stackset-controller)."""
 
     version = "zalando.org/v1"
     endpoint = "stacks"
diff --git a/kube_downscaler/scaler.py b/kube_downscaler/scaler.py
index a443163..29ef516 100644
--- a/kube_downscaler/scaler.py
+++ b/kube_downscaler/scaler.py
@@ -1,10 +1,13 @@
 import datetime
 import logging
-import pykube
 from typing import FrozenSet
 
+import pykube
+from pykube import CronJob
+from pykube import Deployment
+from pykube import StatefulSet
+
 from kube_downscaler import helper
-from pykube import Deployment, StatefulSet, CronJob
 from kube_downscaler.resources.stack import Stack
 
 logger = logging.getLogger(__name__)
@@ -27,7 +30,7 @@ def within_grace_period(deploy, grace_period: int, now: datetime.datetime):
 
 
 def pods_force_uptime(api, namespace: str):
-    """Returns True if there are any running pods which require the deployments to be scaled back up"""
+    """Return True if there are any running pods which require the deployments to be scaled back up."""
     for pod in pykube.Pod.objects(api).filter(namespace=(namespace or pykube.all)):
         if pod.obj.get("status", {}).get("phase") in ("Succeeded", "Failed"):
             continue
diff --git a/kube_downscaler/shutdown.py b/kube_downscaler/shutdown.py
index cfa1075..3bb93d3 100644
--- a/kube_downscaler/shutdown.py
+++ b/kube_downscaler/shutdown.py
@@ -1,7 +1,6 @@
-import sys
-
 import contextlib
 import signal
+import sys
 
 
 class GracefulShutdown:
diff --git a/poetry.lock b/poetry.lock
index 48ec40d..7d52d2a 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -6,6 +6,17 @@ optional = false
 python-versions = "*"
 version = "1.4.3"
 
+[[package]]
+category = "dev"
+description = "A few extensions to pyyaml."
+name = "aspy.yaml"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "1.3.0"
+
+[package.dependencies]
+pyyaml = "*"
+
 [[package]]
 category = "dev"
 description = "Atomic file writes."
@@ -57,6 +68,17 @@ optional = false
 python-versions = "*"
 version = "2019.11.28"
 
+[[package]]
+category = "dev"
+description = "Validate configuration and produce human readable error messages."
+name = "cfgv"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "2.0.1"
+
+[package.dependencies]
+six = "*"
+
 [[package]]
 category = "main"
 description = "Universal encoding detector for Python 2 and 3"
@@ -96,10 +118,10 @@ description = "Show coverage stats online via coveralls.io"
 name = "coveralls"
 optional = false
 python-versions = "*"
-version = "1.9.2"
+version = "1.10.0"
 
 [package.dependencies]
-coverage = ">=3.6,<5.0"
+coverage = ">=3.6,<6.0"
 docopt = ">=0.6.1"
 requests = ">=1.0.0"
 
@@ -136,6 +158,17 @@ mccabe = ">=0.6.0,<0.7.0"
 pycodestyle = ">=2.5.0,<2.6.0"
 pyflakes = ">=2.1.0,<2.2.0"
 
+[[package]]
+category = "dev"
+description = "File identification library for Python"
+name = "identify"
+optional = false
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,>=2.7"
+version = "1.4.9"
+
+[package.extras]
+license = ["editdistance"]
+
 [[package]]
 category = "main"
 description = "Internationalized Domain Names in Applications (IDNA)"
@@ -151,7 +184,7 @@ marker = "python_version < \"3.8\""
 name = "importlib-metadata"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
-version = "1.3.0"
+version = "1.4.0"
 
 [package.dependencies]
 zipp = ">=0.5"
@@ -174,7 +207,7 @@ description = "More routines for operating on iterables, beyond itertools"
 name = "more-itertools"
 optional = false
 python-versions = ">=3.5"
-version = "8.0.2"
+version = "8.1.0"
 
 [[package]]
 category = "dev"
@@ -200,13 +233,21 @@ optional = false
 python-versions = "*"
 version = "0.4.3"
 
+[[package]]
+category = "dev"
+description = "Node.js virtual environment builder"
+name = "nodeenv"
+optional = false
+python-versions = "*"
+version = "1.3.4"
+
 [[package]]
 category = "dev"
 description = "Core utilities for Python packages"
 name = "packaging"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "19.2"
+version = "20.0"
 
 [package.dependencies]
 pyparsing = ">=2.0.2"
@@ -217,8 +258,8 @@ category = "dev"
 description = "Utility library for gitignore style pattern matching of file paths."
 name = "pathspec"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "0.6.0"
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+version = "0.7.0"
 
 [[package]]
 category = "dev"
@@ -236,13 +277,35 @@ version = ">=0.12"
 [package.extras]
 dev = ["pre-commit", "tox"]
 
+[[package]]
+category = "dev"
+description = "A framework for managing and maintaining multi-language pre-commit hooks."
+name = "pre-commit"
+optional = false
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
+version = "1.21.0"
+
+[package.dependencies]
+"aspy.yaml" = "*"
+cfgv = ">=2.0.0"
+identify = ">=1.0.0"
+nodeenv = ">=0.11.1"
+pyyaml = "*"
+six = "*"
+toml = "*"
+virtualenv = ">=15.2"
+
+[package.dependencies.importlib-metadata]
+python = "<3.8"
+version = "*"
+
 [[package]]
 category = "dev"
 description = "library with cross-python path, ini-parsing, io, code, log facilities"
 name = "py"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "1.8.0"
+version = "1.8.1"
 
 [[package]]
 category = "dev"
@@ -265,11 +328,11 @@ category = "main"
 description = "Python client library for Kubernetes"
 name = "pykube-ng"
 optional = false
-python-versions = "*"
-version = "19.12.0"
+python-versions = ">=3.6"
+version = "19.12.1"
 
 [package.dependencies]
-PyYAML = "*"
+pyyaml = "*"
 requests = ">=2.12"
 
 [package.extras]
@@ -281,7 +344,7 @@ description = "Python parsing module"
 name = "pyparsing"
 optional = false
 python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
-version = "2.4.5"
+version = "2.4.6"
 
 [[package]]
 category = "dev"
@@ -336,8 +399,8 @@ category = "main"
 description = "YAML parser and emitter for Python"
 name = "pyyaml"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "5.2"
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+version = "5.3"
 
 [[package]]
 category = "dev"
@@ -345,7 +408,7 @@ description = "Alternative regular expression module, to replace re."
 name = "regex"
 optional = false
 python-versions = "*"
-version = "2019.12.20"
+version = "2020.1.8"
 
 [[package]]
 category = "main"
@@ -409,13 +472,25 @@ version = "1.22"
 secure = ["pyOpenSSL (>=0.14)", "cryptography (>=1.3.4)", "idna (>=2.0.0)", "certifi", "ipaddress"]
 socks = ["PySocks (>=1.5.6,<1.5.7 || >1.5.7,<2.0)"]
 
+[[package]]
+category = "dev"
+description = "Virtual Python Environment builder"
+name = "virtualenv"
+optional = false
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,>=2.7"
+version = "16.7.9"
+
+[package.extras]
+docs = ["sphinx (>=1.8.0,<2)", "towncrier (>=18.5.0)", "sphinx-rtd-theme (>=0.4.2,<1)"]
+testing = ["pytest (>=4.0.0,<5)", "coverage (>=4.5.0,<5)", "pytest-timeout (>=1.3.0,<2)", "six (>=1.10.0,<2)", "pytest-xdist", "pytest-localserver", "pypiserver", "mock", "xonsh"]
+
 [[package]]
 category = "dev"
 description = "Measures number of Terminal column cells of wide-character codes"
 name = "wcwidth"
 optional = false
 python-versions = "*"
-version = "0.1.7"
+version = "0.1.8"
 
 [[package]]
 category = "dev"
@@ -434,7 +509,7 @@ docs = ["sphinx", "jaraco.packaging (>=3.2)", "rst.linker (>=1.9)"]
 testing = ["pathlib2", "contextlib2", "unittest2"]
 
 [metadata]
-content-hash = "4ac96ff5610fb67c01927433d5cd95a46a5d2aecdc0e37993d15b144d3e97728"
+content-hash = "e447200c96ef9b3f7513b5cbe07e050446b56c5ff0020986c9980c6e1f693c81"
 python-versions = ">=3.7"
 
 [metadata.files]
@@ -442,6 +517,10 @@ appdirs = [
     {file = "appdirs-1.4.3-py2.py3-none-any.whl", hash = "sha256:d8b24664561d0d34ddfaec54636d502d7cea6e29c3eaf68f3df6180863e2166e"},
     {file = "appdirs-1.4.3.tar.gz", hash = "sha256:9e5896d1372858f8dd3344faf4e5014d21849c756c8d5701f78f8a103b372d92"},
 ]
+"aspy.yaml" = [
+    {file = "aspy.yaml-1.3.0-py2.py3-none-any.whl", hash = "sha256:463372c043f70160a9ec950c3f1e4c3a82db5fca01d334b6bc89c7164d744bdc"},
+    {file = "aspy.yaml-1.3.0.tar.gz", hash = "sha256:e7c742382eff2caed61f87a39d13f99109088e5e93f04d76eb8d4b28aa143f45"},
+]
 atomicwrites = [
     {file = "atomicwrites-1.3.0-py2.py3-none-any.whl", hash = "sha256:03472c30eb2c5d1ba9227e4c2ca66ab8287fbfbbda3888aa93dc2e28fc6811b4"},
     {file = "atomicwrites-1.3.0.tar.gz", hash = "sha256:75a9445bac02d8d058d5e1fe689654ba5a6556a1dfd8ce6ec55a0ed79866cfa6"},
@@ -458,6 +537,10 @@ certifi = [
     {file = "certifi-2019.11.28-py2.py3-none-any.whl", hash = "sha256:017c25db2a153ce562900032d5bc68e9f191e44e9a0f762f373977de9df1fbb3"},
     {file = "certifi-2019.11.28.tar.gz", hash = "sha256:25b64c7da4cd7479594d035c08c2d809eb4aab3a26e5a990ea98cc450c320f1f"},
 ]
+cfgv = [
+    {file = "cfgv-2.0.1-py2.py3-none-any.whl", hash = "sha256:fbd93c9ab0a523bf7daec408f3be2ed99a980e20b2d19b50fc184ca6b820d289"},
+    {file = "cfgv-2.0.1.tar.gz", hash = "sha256:edb387943b665bf9c434f717bf630fa78aecd53d5900d2e05da6ad6048553144"},
+]
 chardet = [
     {file = "chardet-3.0.4-py2.py3-none-any.whl", hash = "sha256:fc323ffcaeaed0e0a02bf4d117757b98aed530d9ed4531e3e15460124c106691"},
     {file = "chardet-3.0.4.tar.gz", hash = "sha256:84ab92ed1c4d4f16916e05906b6b75a6c0fb5db821cc65e70cbd64a3e2a5eaae"},
@@ -513,8 +596,8 @@ coverage = [
     {file = "coverage-4.4.2.win32-py3.6.exe", hash = "sha256:f98b461cb59f117887aa634a66022c0bd394278245ed51189f63a036516e32de"},
 ]
 coveralls = [
-    {file = "coveralls-1.9.2-py2.py3-none-any.whl", hash = "sha256:25522a50cdf720d956601ca6ef480786e655ae2f0c94270c77e1a23d742de558"},
-    {file = "coveralls-1.9.2.tar.gz", hash = "sha256:8e3315e8620bb6b3c6f3179a75f498e7179c93b3ddc440352404f941b1f70524"},
+    {file = "coveralls-1.10.0-py2.py3-none-any.whl", hash = "sha256:906e07a12b2ac04b8ad782d06173975fe5ff815fe9df3bfedd2c099bc5791aec"},
+    {file = "coveralls-1.10.0.tar.gz", hash = "sha256:2da39aeaef986757653f0a442ba2bef22a8ec602c8bacbc69d39f468dfae12ec"},
 ]
 docopt = [
     {file = "docopt-0.6.2.tar.gz", hash = "sha256:49b3a825280bd66b3aa83585ef59c4a8c82f2c8a522dbe754a8bc8d08c85c491"},
@@ -527,21 +610,25 @@ flake8 = [
     {file = "flake8-3.7.9-py2.py3-none-any.whl", hash = "sha256:49356e766643ad15072a789a20915d3c91dc89fd313ccd71802303fd67e4deca"},
     {file = "flake8-3.7.9.tar.gz", hash = "sha256:45681a117ecc81e870cbf1262835ae4af5e7a8b08e40b944a8a6e6b895914cfb"},
 ]
+identify = [
+    {file = "identify-1.4.9-py2.py3-none-any.whl", hash = "sha256:72e9c4ed3bc713c7045b762b0d2e2115c572b85abfc1f4604f5a4fd4c6642b71"},
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+    {file = "regex-2020.1.8-cp38-cp38-manylinux2010_x86_64.whl", hash = "sha256:0932941cdfb3afcbc26cc3bcf7c3f3d73d5a9b9c56955d432dbf8bbc147d4c5b"},
+    {file = "regex-2020.1.8-cp38-cp38-win32.whl", hash = "sha256:d58e4606da2a41659c84baeb3cfa2e4c87a74cec89a1e7c56bee4b956f9d7461"},
+    {file = "regex-2020.1.8-cp38-cp38-win_amd64.whl", hash = "sha256:e7c7661f7276507bce416eaae22040fd91ca471b5b33c13f8ff21137ed6f248c"},
+    {file = "regex-2020.1.8.tar.gz", hash = "sha256:d0f424328f9822b0323b3b6f2e4b9c90960b24743d220763c7f07071e0778351"},
 ]
 requests = [
     {file = "requests-2.22.0-py2.py3-none-any.whl", hash = "sha256:9cf5292fcd0f598c671cfc1e0d7d1a7f13bb8085e9a590f48c010551dc6c4b31"},
@@ -686,9 +781,13 @@ urllib3 = [
     {file = "urllib3-1.22-py2.py3-none-any.whl", hash = "sha256:06330f386d6e4b195fbfc736b297f58c5a892e4440e54d294d7004e3a9bbea1b"},
     {file = "urllib3-1.22.tar.gz", hash = "sha256:cc44da8e1145637334317feebd728bd869a35285b93cbb4cca2577da7e62db4f"},
 ]
+virtualenv = [
+    {file = "virtualenv-16.7.9-py2.py3-none-any.whl", hash = "sha256:55059a7a676e4e19498f1aad09b8313a38fcc0cdbe4fdddc0e9b06946d21b4bb"},
+    {file = "virtualenv-16.7.9.tar.gz", hash = "sha256:0d62c70883c0342d59c11d0ddac0d954d0431321a41ab20851facf2b222598f3"},
+]
 wcwidth = [
-    {file = "wcwidth-0.1.7-py2.py3-none-any.whl", hash = "sha256:f4ebe71925af7b40a864553f761ed559b43544f8f71746c2d756c7fe788ade7c"},
-    {file = "wcwidth-0.1.7.tar.gz", hash = "sha256:3df37372226d6e63e1b1e1eda15c594bca98a22d33a23832a90998faa96bc65e"},
+    {file = "wcwidth-0.1.8-py2.py3-none-any.whl", hash = "sha256:8fd29383f539be45b20bd4df0dc29c20ba48654a41e661925e612311e9f3c603"},
+    {file = "wcwidth-0.1.8.tar.gz", hash = "sha256:f28b3e8a6483e5d49e7f8949ac1a78314e740333ae305b4ba5defd3e74fb37a8"},
 ]
 zipp = [
     {file = "zipp-0.6.0-py2.py3-none-any.whl", hash = "sha256:f06903e9f1f43b12d371004b4ac7b06ab39a44adc747266928ae6debfa7b3335"},
diff --git a/pyproject.toml b/pyproject.toml
index 58d3cd3..86f8a63 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -18,3 +18,4 @@ pytest = "*"
 pytest-cov = "*"
 black = "^19.10b0"
 mypy = "^0.761"
+pre-commit = "^1.21.0"
diff --git a/tests/test_autoscale_resource.py b/tests/test_autoscale_resource.py
index 9a899bc..e903f0d 100644
--- a/tests/test_autoscale_resource.py
+++ b/tests/test_autoscale_resource.py
@@ -1,21 +1,20 @@
 import json
-import pykube
-import pytest
 import logging
+from datetime import datetime
+from datetime import timezone
+from unittest.mock import MagicMock
 
-from datetime import datetime, timezone
+import pykube
+import pytest
 from pykube import Deployment
-from unittest.mock import MagicMock
 
-from kube_downscaler.scaler import (
-    autoscale_resource,
-    EXCLUDE_ANNOTATION,
-    ORIGINAL_REPLICAS_ANNOTATION,
-    DOWNTIME_REPLICAS_ANNOTATION,
-    UPSCALE_PERIOD_ANNOTATION,
-    DOWNSCALE_PERIOD_ANNOTATION,
-)
 from kube_downscaler.resources.stack import Stack
+from kube_downscaler.scaler import autoscale_resource
+from kube_downscaler.scaler import DOWNSCALE_PERIOD_ANNOTATION
+from kube_downscaler.scaler import DOWNTIME_REPLICAS_ANNOTATION
+from kube_downscaler.scaler import EXCLUDE_ANNOTATION
+from kube_downscaler.scaler import ORIGINAL_REPLICAS_ANNOTATION
+from kube_downscaler.scaler import UPSCALE_PERIOD_ANNOTATION
 
 
 @pytest.fixture
@@ -200,8 +199,7 @@ def test_scale_up(resource):
 
 
 def test_scale_up_downtime_replicas_annotation(resource):
-    """Cli argument downtime-replicas is 1, but for 1 specific deployment we want 0.
-    """
+    """Cli argument downtime-replicas is 1, but for 1 specific deployment we want 0."""
     resource.annotations = {
         DOWNTIME_REPLICAS_ANNOTATION: "0",
         ORIGINAL_REPLICAS_ANNOTATION: "1",
diff --git a/tests/test_grace_period.py b/tests/test_grace_period.py
index 31f79a7..5717cf6 100644
--- a/tests/test_grace_period.py
+++ b/tests/test_grace_period.py
@@ -1,5 +1,9 @@
-from datetime import datetime, timedelta, timezone
+from datetime import datetime
+from datetime import timedelta
+from datetime import timezone
+
 from pykube import Deployment
+
 from kube_downscaler.scaler import within_grace_period
 
 
diff --git a/tests/test_main.py b/tests/test_main.py
index 668986e..9b004d4 100644
--- a/tests/test_main.py
+++ b/tests/test_main.py
@@ -1,9 +1,8 @@
-import pytest
-
 import os.path
-
 from unittest.mock import MagicMock
 
+import pytest
+
 from kube_downscaler.main import main
 
 
diff --git a/tests/test_pods_force_uptime.py b/tests/test_pods_force_uptime.py
index d377f8b..b716586 100644
--- a/tests/test_pods_force_uptime.py
+++ b/tests/test_pods_force_uptime.py
@@ -1,6 +1,8 @@
-from unittest.mock import patch, MagicMock
+from unittest.mock import MagicMock
+from unittest.mock import patch
 
-from kube_downscaler.scaler import pods_force_uptime, FORCE_UPTIME_ANNOTATION
+from kube_downscaler.scaler import FORCE_UPTIME_ANNOTATION
+from kube_downscaler.scaler import pods_force_uptime
 
 
 @patch("pykube.Pod")
diff --git a/tests/test_resources.py b/tests/test_resources.py
index ebeea9a..64cf713 100644
--- a/tests/test_resources.py
+++ b/tests/test_resources.py
@@ -1,8 +1,9 @@
 from unittest.mock import MagicMock
 
+from pykube import Deployment
+from pykube import StatefulSet
 from pykube.objects import NamespacedAPIObject
 
-from pykube import Deployment, StatefulSet
 from kube_downscaler.resources.stack import Stack
 
 
diff --git a/tests/test_scaler.py b/tests/test_scaler.py
index bd2ed79..72a4cc3 100644
--- a/tests/test_scaler.py
+++ b/tests/test_scaler.py
@@ -1,12 +1,10 @@
 import json
 from unittest.mock import MagicMock
 
-from kube_downscaler.scaler import (
-    scale,
-    ORIGINAL_REPLICAS_ANNOTATION,
-    EXCLUDE_ANNOTATION,
-    DOWNTIME_REPLICAS_ANNOTATION,
-)
+from kube_downscaler.scaler import DOWNTIME_REPLICAS_ANNOTATION
+from kube_downscaler.scaler import EXCLUDE_ANNOTATION
+from kube_downscaler.scaler import ORIGINAL_REPLICAS_ANNOTATION
+from kube_downscaler.scaler import scale
 
 
 def test_scaler_always_up(monkeypatch):
@@ -599,9 +597,7 @@ def get(url, version, **kwargs):
                 ]
             }
         elif url == "namespaces/default":
-            data = {
-                "metadata": {"annotations": {"downscaler/uptime": "never"}}
-            }
+            data = {"metadata": {"annotations": {"downscaler/uptime": "never"}}}
             # data = {'metadata': {}}
         else:
             raise Exception(f"unexpected call: {url}, {version}, {kwargs}")
@@ -669,10 +665,12 @@ def get(url, version, **kwargs):
             }
         elif url == "namespaces/default":
             data = {
-                "metadata": {"annotations": {
-                    "downscaler/uptime": "always",
-                    "downscaler/downtime": "never"
-                }}
+                "metadata": {
+                    "annotations": {
+                        "downscaler/uptime": "always",
+                        "downscaler/downtime": "never",
+                    }
+                }
             }
             # data = {'metadata': {}}
         else:
@@ -711,9 +709,6 @@ def get(url, version, **kwargs):
             "creationTimestamp": "2019-03-01T16:38:00Z",
             "annotations": {ORIGINAL_REPLICAS_ANNOTATION: None},
         },
-        "spec": {
-            "suspend": False,
-            "startingDeadlineSeconds": 0,
-        },
+        "spec": {"suspend": False, "startingDeadlineSeconds": 0},
     }
     assert json.loads(api.patch.call_args[1]["data"]) == patch_data
diff --git a/tests/test_time.py b/tests/test_time.py
index eab8248..a8fb9a2 100644
--- a/tests/test_time.py
+++ b/tests/test_time.py
@@ -1,6 +1,8 @@
+from datetime import datetime
+from datetime import timezone
+
 import pytest
 
-from datetime import datetime, timezone
 from kube_downscaler.helper import matches_time_spec