diff --git a/.github/workflows/python-package.yml b/.github/workflows/python-package.yml
index f5d9e65..8de8f4e 100644
--- a/.github/workflows/python-package.yml
+++ b/.github/workflows/python-package.yml
@@ -26,15 +26,14 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install flake8 pytest
-        pip install -r requirements.txt
-        pip install -r .requirements-test.txt
-    - name: Lint with flake8
+        pip install poetry
+        poetry install --extras test
+    - name: Lint with flake8 and prospector
       run: |
         # stop the build if there are Python syntax errors or undefined names
         flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
-        # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
-        flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+        # check for other issues but don't stop the build
+        prospector --strictness veryhigh --zero-exit
     - name: Test with pytest
       run: |
         pytest
diff --git a/.requirements-test.txt b/.requirements-test.txt
deleted file mode 100644
index a878829..0000000
--- a/.requirements-test.txt
+++ /dev/null
@@ -1,3 +0,0 @@
-scipy
-mdtraj
-pytest
diff --git a/poetry.lock b/poetry.lock
new file mode 100644
index 0000000..0a5dc16
--- /dev/null
+++ b/poetry.lock
@@ -0,0 +1,803 @@
+[[package]]
+category = "main"
+description = "Read/rewrite/write Python ASTs"
+name = "astor"
+optional = true
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,>=2.7"
+version = "0.8.1"
+
+[[package]]
+category = "dev"
+description = "An abstract syntax tree for Python with inference support."
+name = "astroid"
+optional = false
+python-versions = ">=3.5"
+version = "2.4.1"
+
+[package.dependencies]
+lazy-object-proxy = ">=1.4.0,<1.5.0"
+six = ">=1.12,<2.0"
+wrapt = ">=1.11,<2.0"
+
+[package.dependencies.typed-ast]
+python = "<3.8"
+version = ">=1.4.0,<1.5"
+
+[[package]]
+category = "dev"
+description = "Atomic file writes."
+marker = "sys_platform == \"win32\""
+name = "atomicwrites"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "1.4.0"
+
+[[package]]
+category = "dev"
+description = "Classes Without Boilerplate"
+name = "attrs"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "20.1.0"
+
+[package.extras]
+dev = ["coverage (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface", "sphinx", "sphinx-rtd-theme", "pre-commit"]
+docs = ["sphinx", "sphinx-rtd-theme", "zope.interface"]
+tests = ["coverage (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface"]
+
+[[package]]
+category = "dev"
+description = "Cross-platform colored terminal text."
+marker = "sys_platform == \"win32\""
+name = "colorama"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+version = "0.4.3"
+
+[[package]]
+category = "main"
+description = "The Cython compiler for writing C extensions for the Python language."
+name = "cython"
+optional = false
+python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
+version = "0.29.21"
+
+[[package]]
+category = "dev"
+description = "Dodgy: Searches for dodgy looking lines in Python code"
+name = "dodgy"
+optional = false
+python-versions = "*"
+version = "0.2.1"
+
+[[package]]
+category = "dev"
+description = "the modular source code checker: pep8 pyflakes and co"
+name = "flake8"
+optional = false
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,>=2.7"
+version = "3.8.3"
+
+[package.dependencies]
+mccabe = ">=0.6.0,<0.7.0"
+pycodestyle = ">=2.6.0a1,<2.7.0"
+pyflakes = ">=2.2.0,<2.3.0"
+
+[package.dependencies.importlib-metadata]
+python = "<3.8"
+version = "*"
+
+[[package]]
+category = "dev"
+description = "Polyfill package for Flake8 plugins"
+name = "flake8-polyfill"
+optional = false
+python-versions = "*"
+version = "1.0.2"
+
+[package.dependencies]
+flake8 = "*"
+
+[[package]]
+category = "dev"
+description = "Read metadata from Python packages"
+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 = "1.7.0"
+
+[package.dependencies]
+zipp = ">=0.5"
+
+[package.extras]
+docs = ["sphinx", "rst.linker"]
+testing = ["packaging", "pep517", "importlib-resources (>=1.3)"]
+
+[[package]]
+category = "dev"
+description = "iniconfig: brain-dead simple config-ini parsing"
+name = "iniconfig"
+optional = false
+python-versions = "*"
+version = "1.0.1"
+
+[[package]]
+category = "dev"
+description = "A Python utility / library to sort Python imports."
+name = "isort"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "4.3.21"
+
+[package.extras]
+pipfile = ["pipreqs", "requirementslib"]
+pyproject = ["toml"]
+requirements = ["pipreqs", "pip-api"]
+xdg_home = ["appdirs (>=1.4.0)"]
+
+[[package]]
+category = "dev"
+description = "A fast and thorough lazy object proxy."
+name = "lazy-object-proxy"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "1.4.3"
+
+[[package]]
+category = "dev"
+description = "McCabe checker, plugin for flake8"
+name = "mccabe"
+optional = false
+python-versions = "*"
+version = "0.6.1"
+
+[[package]]
+category = "main"
+description = "MDTraj: A modern, open library for the analysis of molecular dynamics trajectories"
+name = "mdtraj"
+optional = true
+python-versions = "*"
+version = "1.9.4"
+
+[package.dependencies]
+astor = "*"
+numpy = ">=1.6"
+pyparsing = "*"
+scipy = "*"
+
+[[package]]
+category = "dev"
+description = "More routines for operating on iterables, beyond itertools"
+name = "more-itertools"
+optional = false
+python-versions = ">=3.5"
+version = "8.5.0"
+
+[[package]]
+category = "main"
+description = "NumPy is the fundamental package for array computing with Python."
+name = "numpy"
+optional = false
+python-versions = ">=3.6"
+version = "1.19.1"
+
+[[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 = "20.4"
+
+[package.dependencies]
+pyparsing = ">=2.0.2"
+six = "*"
+
+[[package]]
+category = "dev"
+description = "Check PEP-8 naming conventions, plugin for flake8"
+name = "pep8-naming"
+optional = false
+python-versions = "*"
+version = "0.10.0"
+
+[package.dependencies]
+flake8-polyfill = ">=1.0.2,<2"
+
+[[package]]
+category = "dev"
+description = "plugin and hook calling mechanisms for python"
+name = "pluggy"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "0.13.1"
+
+[package.dependencies]
+[package.dependencies.importlib-metadata]
+python = "<3.8"
+version = ">=0.12"
+
+[package.extras]
+dev = ["pre-commit", "tox"]
+
+[[package]]
+category = "dev"
+description = "Prospector: python static analysis tool"
+name = "prospector"
+optional = false
+python-versions = "*"
+version = "1.3.0"
+
+[package.dependencies]
+astroid = "2.4.1"
+dodgy = ">=0.1.9"
+mccabe = ">=0.5.0"
+pep8-naming = ">=0.3.3,<=0.10.0"
+pycodestyle = ">=2.6.0,<2.7.0"
+pydocstyle = ">=2.0.0"
+pyflakes = ">=2.2.0,<2.3.0"
+pylint = "2.5.2"
+pylint-celery = "0.3"
+pylint-django = "2.0.15"
+pylint-flask = "0.6"
+pylint-plugin-utils = ">=0.2.6"
+pyyaml = "*"
+requirements-detector = ">=0.6"
+setoptconf = ">=0.2.0"
+
+[package.extras]
+with_bandit = ["bandit (>=1.5.1)"]
+with_everything = ["bandit (>=1.5.1)", "frosted (>=1.4.1)", "mypy (>=0.600)", "pyroma (>=2.4)", "vulture (>=1.5)"]
+with_frosted = ["frosted (>=1.4.1)"]
+with_mypy = ["mypy (>=0.600)"]
+with_pyroma = ["pyroma (>=2.4)"]
+with_vulture = ["vulture (>=1.5)"]
+
+[[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 = "1.9.0"
+
+[[package]]
+category = "dev"
+description = "Python style guide checker"
+name = "pycodestyle"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "2.6.0"
+
+[[package]]
+category = "dev"
+description = "Python docstring style checker"
+name = "pydocstyle"
+optional = false
+python-versions = ">=3.5"
+version = "5.1.1"
+
+[package.dependencies]
+snowballstemmer = "*"
+
+[[package]]
+category = "dev"
+description = "passive checker of Python programs"
+name = "pyflakes"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "2.2.0"
+
+[[package]]
+category = "dev"
+description = "python code static checker"
+name = "pylint"
+optional = false
+python-versions = ">=3.5.*"
+version = "2.5.2"
+
+[package.dependencies]
+astroid = ">=2.4.0,<=2.5"
+colorama = "*"
+isort = ">=4.2.5,<5"
+mccabe = ">=0.6,<0.7"
+toml = ">=0.7.1"
+
+[[package]]
+category = "dev"
+description = "pylint-celery is a Pylint plugin to aid Pylint in recognising and understandingerrors caused when using the Celery library"
+name = "pylint-celery"
+optional = false
+python-versions = "*"
+version = "0.3"
+
+[package.dependencies]
+astroid = ">=1.0"
+pylint = ">=1.0"
+pylint-plugin-utils = ">=0.2.1"
+
+[[package]]
+category = "dev"
+description = "A Pylint plugin to help Pylint understand the Django web framework"
+name = "pylint-django"
+optional = false
+python-versions = "*"
+version = "2.0.15"
+
+[package.dependencies]
+pylint = ">=2.0"
+pylint-plugin-utils = ">=0.5"
+
+[package.extras]
+for_tests = ["coverage", "django-tables2", "factory-boy", "pytest"]
+with_django = ["django"]
+
+[[package]]
+category = "dev"
+description = "pylint-flask is a Pylint plugin to aid Pylint in recognizing and understanding errors caused when using Flask"
+name = "pylint-flask"
+optional = false
+python-versions = "*"
+version = "0.6"
+
+[package.dependencies]
+pylint-plugin-utils = ">=0.2.1"
+
+[[package]]
+category = "dev"
+description = "Utilities and helpers for writing Pylint plugins"
+name = "pylint-plugin-utils"
+optional = false
+python-versions = "*"
+version = "0.6"
+
+[package.dependencies]
+pylint = ">=1.7"
+
+[[package]]
+category = "main"
+description = "Python parsing module"
+name = "pyparsing"
+optional = false
+python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
+version = "2.4.7"
+
+[[package]]
+category = "dev"
+description = "pytest: simple powerful testing with Python"
+name = "pytest"
+optional = false
+python-versions = ">=3.5"
+version = "6.0.1"
+
+[package.dependencies]
+atomicwrites = ">=1.0"
+attrs = ">=17.4.0"
+colorama = "*"
+iniconfig = "*"
+more-itertools = ">=4.0.0"
+packaging = "*"
+pluggy = ">=0.12,<1.0"
+py = ">=1.8.2"
+toml = "*"
+
+[package.dependencies.importlib-metadata]
+python = "<3.8"
+version = ">=0.12"
+
+[package.extras]
+checkqa_mypy = ["mypy (0.780)"]
+testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "requests", "xmlschema"]
+
+[[package]]
+category = "dev"
+description = "YAML parser and emitter for Python"
+name = "pyyaml"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+version = "5.3.1"
+
+[[package]]
+category = "dev"
+description = "Python tool to find and list requirements of a Python project"
+name = "requirements-detector"
+optional = false
+python-versions = "*"
+version = "0.7"
+
+[package.dependencies]
+astroid = ">=1.4"
+
+[[package]]
+category = "main"
+description = "SciPy: Scientific Library for Python"
+name = "scipy"
+optional = true
+python-versions = ">=3.6"
+version = "1.5.2"
+
+[package.dependencies]
+numpy = ">=1.14.5"
+
+[[package]]
+category = "dev"
+description = "A module for retrieving program settings from various sources in a consistant method."
+name = "setoptconf"
+optional = false
+python-versions = "*"
+version = "0.2.0"
+
+[package.extras]
+YAML = ["pyyaml"]
+
+[[package]]
+category = "main"
+description = "Lightweight coordinate-only trajectory reader based on code from GROMACS, MDAnalysis, VMD."
+name = "simpletraj"
+optional = false
+python-versions = "*"
+version = "0.5"
+
+[package.dependencies]
+numpy = "*"
+
+[package.extras]
+netcdf = ["netcdf4"]
+
+[[package]]
+category = "dev"
+description = "Python 2 and 3 compatibility utilities"
+name = "six"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*"
+version = "1.15.0"
+
+[[package]]
+category = "dev"
+description = "This package provides 26 stemmers for 25 languages generated from Snowball algorithms."
+name = "snowballstemmer"
+optional = false
+python-versions = "*"
+version = "2.0.0"
+
+[[package]]
+category = "dev"
+description = "Python Library for Tom's Obvious, Minimal Language"
+name = "toml"
+optional = false
+python-versions = "*"
+version = "0.10.1"
+
+[[package]]
+category = "dev"
+description = "a fork of Python 2 and 3 ast modules with type comment support"
+marker = "implementation_name == \"cpython\" and python_version < \"3.8\""
+name = "typed-ast"
+optional = false
+python-versions = "*"
+version = "1.4.1"
+
+[[package]]
+category = "dev"
+description = "Module for decorators, wrappers and monkey patching."
+name = "wrapt"
+optional = false
+python-versions = "*"
+version = "1.12.1"
+
+[[package]]
+category = "dev"
+description = "A formatter for Python code."
+name = "yapf"
+optional = false
+python-versions = "*"
+version = "0.30.0"
+
+[[package]]
+category = "dev"
+description = "Backport of pathlib-compatible object wrapper for zip files"
+marker = "python_version < \"3.8\""
+name = "zipp"
+optional = false
+python-versions = ">=3.6"
+version = "3.1.0"
+
+[package.extras]
+docs = ["sphinx", "jaraco.packaging (>=3.2)", "rst.linker (>=1.9)"]
+testing = ["jaraco.itertools", "func-timeout"]
+
+[extras]
+mdtraj = ["mdtraj"]
+test = ["mdtraj"]
+
+[metadata]
+content-hash = "98d3b6b001eb1db816d42650606dc7ac52e3816a84f27ff7b0cafb24a503a669"
+lock-version = "1.0"
+python-versions = "^3.6"
+
+[metadata.files]
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+]
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+]
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diff --git a/pyproject.toml b/pyproject.toml
index 7e86c61..597873f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -24,12 +24,13 @@ mdtraj = { version = "^1.9.4", optional = true }
 
 [tool.poetry.dev-dependencies]
 pytest = "^6.0.1"
-pylint = "^2.6.0"
 yapf = "^0.30.0"
+prospector = "^1.3.0"
+flake8 = "^3.8.3"
 
 [tool.poetry.extras]
 mdtraj = ["mdtraj"]
-test = ["mdtraj", "pytest"]
+test = ["mdtraj", "pytest", "prospector", "flake8"]
 
 [build-system]
 requires = ["poetry>=0.12"]
diff --git a/requirements.txt b/requirements.txt
deleted file mode 100644
index e4494d3..0000000
--- a/requirements.txt
+++ /dev/null
@@ -1,3 +0,0 @@
-numpy
-cython
-simpletraj