diff --git a/.drone.jsonnet b/.drone.jsonnet
index 7b20437..0ecf1eb 100644
--- a/.drone.jsonnet
+++ b/.drone.jsonnet
@@ -3,15 +3,13 @@ local PythonVersion(pyversion='3.5') = {
   image: 'python:' + pyversion,
   environment: {
     PY_COLORS: 1,
-    SETUPTOOLS_SCM_PRETEND_VERSION: '${DRONE_TAG##v}',
   },
   commands: [
-    'pip install pipenv -qq',
-    'pipenv --bare install --dev --keep-outdated',
-    'pipenv run pytest dockertidy --cov=dockertidy --cov-append --no-cov-on-fail',
-    'pip install -qq .',
-    'docker-tidy --help',
-    'docker-tidy --version',
+    'pip install poetry -qq',
+    'poetry install -q',
+    'poetry run pytest dockertidy --cov=dockertidy --cov-append --no-cov-on-fail',
+    'poetry docker-tidy --help',
+    'poetry docker-tidy --version',
   ],
   depends_on: [
     'clone',
@@ -28,14 +26,14 @@ local PipelineLint = {
   steps: [
     {
       name: 'flake8',
-      image: 'python:3.8',
+      image: 'python:3.9',
       environment: {
         PY_COLORS: 1,
       },
       commands: [
-        'pip install pipenv -qq',
-        'pipenv --bare install --dev --keep-outdated',
-        'pipenv run flake8 ./dockertidy',
+        'pip install poetry -qq',
+        'poetry install -q',
+        'poetry run flake8 ./dockertidy',
       ],
     },
   ],
@@ -44,36 +42,6 @@ local PipelineLint = {
   },
 };
 
-local PipelineDeps = {
-  kind: 'pipeline',
-  name: 'dependencies',
-  platform: {
-    os: 'linux',
-    arch: 'amd64',
-  },
-  steps: [
-    {
-      name: 'pipenv',
-      image: 'python:3.8',
-      environment: {
-        PY_COLORS: 1,
-      },
-      commands: [
-        'pip install pipenv -qq',
-        'pipenv --bare install --keep-outdated',
-        'pipenv --bare install --dev --keep-outdated',
-        'pipenv run pipenv-setup check',
-      ],
-    },
-  ],
-  depends_on: [
-    'lint',
-  ],
-  trigger: {
-    ref: ['refs/heads/master', 'refs/tags/**', 'refs/pull/**'],
-  },
-};
-
 local PipelineTest = {
   kind: 'pipeline',
   name: 'test',
@@ -86,9 +54,10 @@ local PipelineTest = {
     PythonVersion(pyversion='3.6'),
     PythonVersion(pyversion='3.7'),
     PythonVersion(pyversion='3.8'),
+    PythonVersion(pyversion='3.9'),
     {
       name: 'codecov',
-      image: 'python:3.8',
+      image: 'python:3.9',
       environment: {
         PY_COLORS: 1,
         CODECOV_TOKEN: { from_secret: 'codecov_token' },
@@ -123,14 +92,14 @@ local PipelineSecurity = {
   steps: [
     {
       name: 'bandit',
-      image: 'python:3.8',
+      image: 'python:3.9',
       environment: {
         PY_COLORS: 1,
       },
       commands: [
-        'pip install pipenv -qq',
-        'pipenv --bare install --dev --keep-outdated',
-        'pipenv run bandit -r ./dockertidy -x ./dockertidy/test',
+        'pip install poetry -qq',
+        'poetry install -q',
+        'poetry run bandit -r ./dockertidy -x ./dockertidy/test',
       ],
     },
   ],
@@ -152,12 +121,10 @@ local PipelineBuildPackage = {
   steps: [
     {
       name: 'build',
-      image: 'python:3.8',
-      environment: {
-        SETUPTOOLS_SCM_PRETEND_VERSION: '${DRONE_TAG##v}',
-      },
+      image: 'python:3.9',
       commands: [
-        'python setup.py sdist bdist_wheel',
+        'pip install poetry poetry-dynamic-versioning -qq',
+        'poetry build',
       ],
     },
     {
@@ -183,12 +150,14 @@ local PipelineBuildPackage = {
     },
     {
       name: 'publish-pypi',
-      image: 'plugins/pypi',
-      settings: {
-        username: { from_secret: 'pypi_username' },
-        password: { from_secret: 'pypi_password' },
-        repository: 'https://upload.pypi.org/legacy/',
-        skip_build: true,
+      image: 'python:3.9',
+      commands: [
+        'pip install poetry poetry-dynamic-versioning -qq',
+        'poetry build',
+      ],
+      environment: {
+        POETRY_HTTP_BASIC_TESTPYPI_USERNAME: { from_secret: 'pypi_username' },
+        POETRY_HTTP_BASIC_TESTPYPI_PASSWORD: { from_secret: 'pypi_password' },
       },
       when: {
         ref: ['refs/tags/**'],
@@ -213,13 +182,11 @@ local PipelineBuildContainer(arch='amd64') = {
   steps: [
     {
       name: 'build',
-      image: 'python:3.8',
+      image: 'python:3.9',
       commands: [
-        'python setup.py bdist_wheel',
+        'pip install poetry poetry-dynamic-versioning -qq',
+        'poetry build',
       ],
-      environment: {
-        SETUPTOOLS_SCM_PRETEND_VERSION: '${DRONE_TAG##v}',
-      },
     },
     {
       name: 'dryrun',
@@ -478,7 +445,6 @@ local PipelineNotifications = {
 
 [
   PipelineLint,
-  PipelineDeps,
   PipelineTest,
   PipelineSecurity,
   PipelineBuildPackage,
diff --git a/.drone.yml b/.drone.yml
index b6e5b64..83458cf 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -8,11 +8,11 @@ platform:
 
 steps:
 - name: flake8
-  image: python:3.8
+  image: python:3.9
   commands:
-  - pip install pipenv -qq
-  - pipenv --bare install --dev --keep-outdated
-  - pipenv run flake8 ./dockertidy
+  - pip install poetry -qq
+  - poetry install -q
+  - poetry run flake8 ./dockertidy
   environment:
     PY_COLORS: 1
 
@@ -22,34 +22,6 @@ trigger:
   - refs/tags/**
   - refs/pull/**
 
----
-kind: pipeline
-name: dependencies
-
-platform:
-  os: linux
-  arch: amd64
-
-steps:
-- name: pipenv
-  image: python:3.8
-  commands:
-  - pip install pipenv -qq
-  - pipenv --bare install --keep-outdated
-  - pipenv --bare install --dev --keep-outdated
-  - pipenv run pipenv-setup check
-  environment:
-    PY_COLORS: 1
-
-trigger:
-  ref:
-  - refs/heads/master
-  - refs/tags/**
-  - refs/pull/**
-
-depends_on:
-- lint
-
 ---
 kind: pipeline
 name: test
@@ -62,65 +34,70 @@ steps:
 - name: python35-pytest
   image: python:3.5
   commands:
-  - pip install pipenv -qq
-  - pipenv --bare install --dev --keep-outdated
-  - pipenv run pytest dockertidy --cov=dockertidy --cov-append --no-cov-on-fail
-  - pip install -qq .
-  - docker-tidy --help
-  - docker-tidy --version
+  - pip install poetry -qq
+  - poetry install -q
+  - poetry run pytest dockertidy --cov=dockertidy --cov-append --no-cov-on-fail
+  - poetry docker-tidy --help
+  - poetry docker-tidy --version
   environment:
     PY_COLORS: 1
-    SETUPTOOLS_SCM_PRETEND_VERSION: ${DRONE_TAG##v}
   depends_on:
   - clone
 
 - name: python36-pytest
   image: python:3.6
   commands:
-  - pip install pipenv -qq
-  - pipenv --bare install --dev --keep-outdated
-  - pipenv run pytest dockertidy --cov=dockertidy --cov-append --no-cov-on-fail
-  - pip install -qq .
-  - docker-tidy --help
-  - docker-tidy --version
+  - pip install poetry -qq
+  - poetry install -q
+  - poetry run pytest dockertidy --cov=dockertidy --cov-append --no-cov-on-fail
+  - poetry docker-tidy --help
+  - poetry docker-tidy --version
   environment:
     PY_COLORS: 1
-    SETUPTOOLS_SCM_PRETEND_VERSION: ${DRONE_TAG##v}
   depends_on:
   - clone
 
 - name: python37-pytest
   image: python:3.7
   commands:
-  - pip install pipenv -qq
-  - pipenv --bare install --dev --keep-outdated
-  - pipenv run pytest dockertidy --cov=dockertidy --cov-append --no-cov-on-fail
-  - pip install -qq .
-  - docker-tidy --help
-  - docker-tidy --version
+  - pip install poetry -qq
+  - poetry install -q
+  - poetry run pytest dockertidy --cov=dockertidy --cov-append --no-cov-on-fail
+  - poetry docker-tidy --help
+  - poetry docker-tidy --version
   environment:
     PY_COLORS: 1
-    SETUPTOOLS_SCM_PRETEND_VERSION: ${DRONE_TAG##v}
   depends_on:
   - clone
 
 - name: python38-pytest
   image: python:3.8
   commands:
-  - pip install pipenv -qq
-  - pipenv --bare install --dev --keep-outdated
-  - pipenv run pytest dockertidy --cov=dockertidy --cov-append --no-cov-on-fail
-  - pip install -qq .
-  - docker-tidy --help
-  - docker-tidy --version
+  - pip install poetry -qq
+  - poetry install -q
+  - poetry run pytest dockertidy --cov=dockertidy --cov-append --no-cov-on-fail
+  - poetry docker-tidy --help
+  - poetry docker-tidy --version
+  environment:
+    PY_COLORS: 1
+  depends_on:
+  - clone
+
+- name: python39-pytest
+  image: python:3.9
+  commands:
+  - pip install poetry -qq
+  - poetry install -q
+  - poetry run pytest dockertidy --cov=dockertidy --cov-append --no-cov-on-fail
+  - poetry docker-tidy --help
+  - poetry docker-tidy --version
   environment:
     PY_COLORS: 1
-    SETUPTOOLS_SCM_PRETEND_VERSION: ${DRONE_TAG##v}
   depends_on:
   - clone
 
 - name: codecov
-  image: python:3.8
+  image: python:3.9
   commands:
   - pip install codecov -qq
   - codecov --required -X gcov
@@ -153,11 +130,11 @@ platform:
 
 steps:
 - name: bandit
-  image: python:3.8
+  image: python:3.9
   commands:
-  - pip install pipenv -qq
-  - pipenv --bare install --dev --keep-outdated
-  - pipenv run bandit -r ./dockertidy -x ./dockertidy/test
+  - pip install poetry -qq
+  - poetry install -q
+  - poetry run bandit -r ./dockertidy -x ./dockertidy/test
   environment:
     PY_COLORS: 1
 
@@ -180,11 +157,10 @@ platform:
 
 steps:
 - name: build
-  image: python:3.8
+  image: python:3.9
   commands:
-  - python setup.py sdist bdist_wheel
-  environment:
-    SETUPTOOLS_SCM_PRETEND_VERSION: ${DRONE_TAG##v}
+  - pip install poetry poetry-dynamic-versioning -qq
+  - poetry build
 
 - name: checksum
   image: alpine
@@ -207,13 +183,14 @@ steps:
     - refs/tags/**
 
 - name: publish-pypi
-  image: plugins/pypi
-  settings:
-    password:
+  image: python:3.9
+  commands:
+  - pip install poetry poetry-dynamic-versioning -qq
+  - poetry build
+  environment:
+    POETRY_HTTP_BASIC_TESTPYPI_PASSWORD:
       from_secret: pypi_password
-    repository: https://upload.pypi.org/legacy/
-    skip_build: true
-    username:
+    POETRY_HTTP_BASIC_TESTPYPI_USERNAME:
       from_secret: pypi_username
   when:
     ref:
@@ -238,11 +215,10 @@ platform:
 
 steps:
 - name: build
-  image: python:3.8
+  image: python:3.9
   commands:
-  - python setup.py bdist_wheel
-  environment:
-    SETUPTOOLS_SCM_PRETEND_VERSION: ${DRONE_TAG##v}
+  - pip install poetry poetry-dynamic-versioning -qq
+  - poetry build
 
 - name: dryrun
   image: plugins/docker:18-linux-amd64
@@ -316,11 +292,10 @@ platform:
 
 steps:
 - name: build
-  image: python:3.8
+  image: python:3.9
   commands:
-  - python setup.py bdist_wheel
-  environment:
-    SETUPTOOLS_SCM_PRETEND_VERSION: ${DRONE_TAG##v}
+  - pip install poetry poetry-dynamic-versioning -qq
+  - poetry build
 
 - name: dryrun
   image: plugins/docker:18-linux-arm64
@@ -394,11 +369,10 @@ platform:
 
 steps:
 - name: build
-  image: python:3.8
+  image: python:3.9
   commands:
-  - python setup.py bdist_wheel
-  environment:
-    SETUPTOOLS_SCM_PRETEND_VERSION: ${DRONE_TAG##v}
+  - pip install poetry poetry-dynamic-versioning -qq
+  - poetry build
 
 - name: dryrun
   image: plugins/docker:18-linux-arm
@@ -642,6 +616,6 @@ depends_on:
 
 ---
 kind: signature
-hmac: 41e4e1996dfd5b429fba2d13465a5a1875affe7f79bbdbcbd39b9449f89bf706
+hmac: de4f69305a1dcd9e48b983fb4e6dd38569e363e81dc62cb2d1a61c7b255b5ae3
 
 ...
diff --git a/pyproject.toml b/pyproject.toml
index 5b17985..3aa87cc 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -106,7 +106,7 @@ filterwarnings = [
 ]
 
 [tool.coverage.run]
-omit = "**/test/*"
+omit = ["**/test/*"]
 
 [build-system]
 build-backend = "poetry.core.masonry.api"