diff --git a/CHANGELOG.md b/CHANGELOG.md
index 547ac44..d74aa9e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## v0.2.1 (27.05.2020)
+
+- Fix building docs on ReadTheDocs
+
 ## v0.2.0 (27.05.2020)
 
 - Refactoring the package with changing some low-level API
diff --git a/docs/conf.py b/docs/conf.py
index 4a12bcb..8551d59 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -10,34 +10,27 @@
 # add these directories to sys.path here. If the directory is relative to the
 # documentation root, use os.path.abspath to make it absolute, like shown here.
 
-import sys
-import pathlib
-import toml
-import re
-
-ROOT_PATH = pathlib.Path(__file__).parent.parent
-
-sys.path.insert(0, str(ROOT_PATH))
-
-
-with (ROOT_PATH / 'pyproject.toml').open() as fp:
-    pyproject_toml = toml.load(fp)
-
-
-def get_author():
-    authors = pyproject_toml['tool']['poetry']['authors']
-    return re.sub(r'<.+>', '', authors[0]).strip()
+from importlib_metadata import metadata, PackageNotFoundError
 
 
 # -- Project information -----------------------------------------------------
-
-project = pyproject_toml['tool']['poetry']['name']
-author = get_author()
+PACKAGE_NAME = 'scikit-mpe'
+
+try:
+    project_metadata = metadata(PACKAGE_NAME)
+except PackageNotFoundError:
+    raise RuntimeError(
+        f"The package '{PACKAGE_NAME}' must be installed. "
+        "Please install the package in editable mode before building docs."
+    )
+
+project = project_metadata['name']
+author = project_metadata['author']
 copyright = f'2020, {author}'
 
 # The full version, including alpha/beta/rc tags
-version = pyproject_toml['tool']['poetry']['version']
-release = pyproject_toml['tool']['poetry']['version']
+version = project_metadata['version']
+release = version
 
 
 # -- General configuration ---------------------------------------------------
diff --git a/poetry.lock b/poetry.lock
index 4f2ef7b..f36dfda 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,8 +1,8 @@
 [[package]]
-category = "dev"
+category = "main"
 description = "A configurable sidebar-enabled Sphinx theme"
 name = "alabaster"
-optional = false
+optional = true
 python-versions = "*"
 version = "0.7.12"
 
@@ -13,7 +13,7 @@ marker = "sys_platform == \"win32\""
 name = "atomicwrites"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "1.3.0"
+version = "1.4.0"
 
 [[package]]
 category = "dev"
@@ -30,10 +30,10 @@ docs = ["sphinx", "zope.interface"]
 tests = ["coverage", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface"]
 
 [[package]]
-category = "dev"
+category = "main"
 description = "Internationalization utilities"
 name = "babel"
-optional = false
+optional = true
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 version = "2.8.0"
 
@@ -41,15 +41,15 @@ version = "2.8.0"
 pytz = ">=2015.7"
 
 [[package]]
-category = "dev"
+category = "main"
 description = "Python package for providing Mozilla's CA Bundle."
 name = "certifi"
 optional = false
 python-versions = "*"
-version = "2019.11.28"
+version = "2020.4.5.1"
 
 [[package]]
-category = "dev"
+category = "main"
 description = "Universal encoding detector for Python 2 and 3"
 name = "chardet"
 optional = false
@@ -57,7 +57,7 @@ python-versions = "*"
 version = "3.0.4"
 
 [[package]]
-category = "dev"
+category = "main"
 description = "Cross-platform colored terminal text."
 marker = "sys_platform == \"win32\""
 name = "colorama"
@@ -71,7 +71,7 @@ description = "Code coverage measurement for Python"
 name = "coverage"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, <4"
-version = "5.0.3"
+version = "5.1"
 
 [package.extras]
 toml = ["toml"]
@@ -82,7 +82,7 @@ description = "Show coverage stats online via coveralls.io"
 name = "coveralls"
 optional = false
 python-versions = "*"
-version = "1.10.0"
+version = "1.11.1"
 
 [package.dependencies]
 coverage = ">=3.6,<6.0"
@@ -90,10 +90,10 @@ docopt = ">=0.6.1"
 requests = ">=1.0.0"
 
 [package.extras]
-yaml = ["PyYAML (>=3.10)"]
+yaml = ["PyYAML (>=3.10,<5.3)"]
 
 [[package]]
-category = "dev"
+category = "main"
 description = "Composable style cycles"
 name = "cycler"
 optional = false
@@ -113,12 +113,12 @@ python-versions = "*"
 version = "0.6"
 
 [[package]]
-category = "dev"
+category = "main"
 description = "Decorators for Humans"
 name = "decorator"
 optional = false
 python-versions = ">=2.6, !=3.0.*, !=3.1.*"
-version = "4.4.1"
+version = "4.4.2"
 
 [[package]]
 category = "dev"
@@ -129,34 +129,29 @@ python-versions = "*"
 version = "0.6.2"
 
 [[package]]
-category = "dev"
+category = "main"
 description = "Docutils -- Python Documentation Utilities"
 name = "docutils"
-optional = false
+optional = true
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 version = "0.16"
 
 [[package]]
 category = "dev"
-description = "Discover and load entry points from installed packages."
-name = "entrypoints"
-optional = false
-python-versions = ">=2.7"
-version = "0.3"
-
-[[package]]
-category = "dev"
-description = "the modular source code checker: pep8, pyflakes and co"
+description = "the modular source code checker: pep8 pyflakes and co"
 name = "flake8"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "3.7.9"
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,>=2.7"
+version = "3.8.2"
 
 [package.dependencies]
-entrypoints = ">=0.3.0,<0.4.0"
 mccabe = ">=0.6.0,<0.7.0"
-pycodestyle = ">=2.5.0,<2.6.0"
-pyflakes = ">=2.1.0,<2.2.0"
+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"
@@ -170,20 +165,20 @@ version = "0.1.6"
 flake8 = ">3.0.0"
 
 [[package]]
-category = "dev"
+category = "main"
 description = "Internationalized Domain Names in Applications (IDNA)"
 name = "idna"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "2.8"
+version = "2.9"
 
 [[package]]
-category = "dev"
+category = "main"
 description = "Library for reading and writing a wide range of image, video, scientific, and volumetric data formats."
 name = "imageio"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "2.6.1"
+python-versions = ">=3.5"
+version = "2.8.0"
 
 [package.dependencies]
 numpy = "*"
@@ -197,10 +192,10 @@ gdal = ["gdal"]
 itk = ["itk"]
 
 [[package]]
-category = "dev"
+category = "main"
 description = "Getting image size from png/jpeg/jpeg2000/gif file"
 name = "imagesize"
-optional = false
+optional = true
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 version = "1.2.0"
 
@@ -220,12 +215,12 @@ docs = ["sphinx", "rst.linker"]
 testing = ["packaging", "importlib-resources"]
 
 [[package]]
-category = "dev"
+category = "main"
 description = "A very fast and expressive template engine."
 name = "jinja2"
-optional = false
+optional = true
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
-version = "2.11.1"
+version = "2.11.2"
 
 [package.dependencies]
 MarkupSafe = ">=0.23"
@@ -234,21 +229,18 @@ MarkupSafe = ">=0.23"
 i18n = ["Babel (>=0.8)"]
 
 [[package]]
-category = "dev"
+category = "main"
 description = "A fast implementation of the Cassowary constraint solver"
 name = "kiwisolver"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "1.1.0"
-
-[package.dependencies]
-setuptools = "*"
+python-versions = ">=3.6"
+version = "1.2.0"
 
 [[package]]
-category = "dev"
+category = "main"
 description = "Markdown and reStructuredText in a single file."
 name = "m2r"
-optional = false
+optional = true
 python-versions = "*"
 version = "0.2.1"
 
@@ -257,20 +249,20 @@ docutils = "*"
 mistune = "*"
 
 [[package]]
-category = "dev"
+category = "main"
 description = "Safely add untrusted strings to HTML/XML markup."
 name = "markupsafe"
-optional = false
+optional = true
 python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*"
 version = "1.1.1"
 
 [[package]]
-category = "dev"
+category = "main"
 description = "Python plotting package"
 name = "matplotlib"
 optional = false
 python-versions = ">=3.6"
-version = "3.1.3"
+version = "3.2.1"
 
 [package.dependencies]
 cycler = ">=0.10"
@@ -288,10 +280,10 @@ python-versions = "*"
 version = "0.6.1"
 
 [[package]]
-category = "dev"
+category = "main"
 description = "The fastest markdown parser in pure Python"
 name = "mistune"
-optional = false
+optional = true
 python-versions = "*"
 version = "0.8.4"
 
@@ -301,10 +293,10 @@ description = "More routines for operating on iterables, beyond itertools"
 name = "more-itertools"
 optional = false
 python-versions = ">=3.5"
-version = "8.2.0"
+version = "8.3.0"
 
 [[package]]
-category = "dev"
+category = "main"
 description = "Python package for creating and manipulating graphs and networks"
 name = "networkx"
 optional = false
@@ -333,13 +325,13 @@ description = "NumPy is the fundamental package for array computing with Python.
 name = "numpy"
 optional = false
 python-versions = ">=3.5"
-version = "1.18.1"
+version = "1.18.4"
 
 [[package]]
-category = "dev"
+category = "main"
 description = "Sphinx extension to support docstrings in Numpy format"
 name = "numpydoc"
-optional = false
+optional = true
 python-versions = "*"
 version = "0.9.2"
 
@@ -348,24 +340,24 @@ Jinja2 = ">=2.3"
 sphinx = ">=1.6.5"
 
 [[package]]
-category = "dev"
+category = "main"
 description = "Core utilities for Python packages"
 name = "packaging"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "20.1"
+version = "20.4"
 
 [package.dependencies]
 pyparsing = ">=2.0.2"
 six = "*"
 
 [[package]]
-category = "dev"
+category = "main"
 description = "Python Imaging Library (Fork)"
 name = "pillow"
 optional = false
 python-versions = ">=3.5"
-version = "7.0.0"
+version = "7.1.2"
 
 [[package]]
 category = "dev"
@@ -391,21 +383,13 @@ optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 version = "1.8.1"
 
-[[package]]
-category = "dev"
-description = "Get CPU info with pure Python 2 & 3"
-name = "py-cpuinfo"
-optional = false
-python-versions = "*"
-version = "5.0.0"
-
 [[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 = "2.5.0"
+version = "2.6.0"
 
 [[package]]
 category = "main"
@@ -413,7 +397,7 @@ description = "Data validation and settings management using python 3.6 type hin
 name = "pydantic"
 optional = false
 python-versions = ">=3.6"
-version = "1.4"
+version = "1.5.1"
 
 [package.dependencies]
 [package.dependencies.dataclasses]
@@ -431,23 +415,23 @@ description = "passive checker of Python programs"
 name = "pyflakes"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "2.1.1"
+version = "2.2.0"
 
 [[package]]
-category = "dev"
+category = "main"
 description = "Pygments is a syntax highlighting package written in Python."
 name = "pygments"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
-version = "2.5.2"
+optional = true
+python-versions = ">=3.5"
+version = "2.6.1"
 
 [[package]]
-category = "dev"
+category = "main"
 description = "Python parsing module"
 name = "pyparsing"
 optional = false
 python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
-version = "2.4.6"
+version = "2.4.7"
 
 [[package]]
 category = "dev"
@@ -455,7 +439,7 @@ description = "pytest: simple powerful testing with Python"
 name = "pytest"
 optional = false
 python-versions = ">=3.5"
-version = "5.3.5"
+version = "5.4.2"
 
 [package.dependencies]
 atomicwrites = ">=1.0"
@@ -475,40 +459,23 @@ version = ">=0.12"
 checkqa-mypy = ["mypy (v0.761)"]
 testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "requests", "xmlschema"]
 
-[[package]]
-category = "dev"
-description = "A ``pytest`` fixture for benchmarking code. It will group the tests into rounds that are calibrated to the chosen timer. See calibration_ and FAQ_."
-name = "pytest-benchmark"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
-version = "3.2.3"
-
-[package.dependencies]
-py-cpuinfo = "*"
-pytest = ">=3.8"
-
-[package.extras]
-aspect = ["aspectlib"]
-elasticsearch = ["elasticsearch"]
-histogram = ["pygal", "pygaljs"]
-
 [[package]]
 category = "dev"
 description = "Pytest plugin for measuring coverage."
 name = "pytest-cov"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "2.8.1"
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+version = "2.9.0"
 
 [package.dependencies]
 coverage = ">=4.4"
 pytest = ">=3.6"
 
 [package.extras]
-testing = ["fields", "hunter", "process-tests (2.0.2)", "six", "virtualenv"]
+testing = ["fields", "hunter", "process-tests (2.0.2)", "six", "pytest-xdist", "virtualenv"]
 
 [[package]]
-category = "dev"
+category = "main"
 description = "Extensions to the standard Python datetime module"
 name = "python-dateutil"
 optional = false
@@ -519,15 +486,15 @@ version = "2.8.1"
 six = ">=1.5"
 
 [[package]]
-category = "dev"
+category = "main"
 description = "World timezone definitions, modern and historical"
 name = "pytz"
-optional = false
+optional = true
 python-versions = "*"
-version = "2019.3"
+version = "2020.1"
 
 [[package]]
-category = "dev"
+category = "main"
 description = "PyWavelets, wavelet transform module"
 name = "pywavelets"
 optional = false
@@ -538,21 +505,21 @@ version = "1.1.1"
 numpy = ">=1.13.3"
 
 [[package]]
-category = "dev"
+category = "main"
 description = "Python HTTP for Humans."
 name = "requests"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
-version = "2.22.0"
+version = "2.23.0"
 
 [package.dependencies]
 certifi = ">=2017.4.17"
-chardet = ">=3.0.2,<3.1.0"
-idna = ">=2.5,<2.9"
+chardet = ">=3.0.2,<4"
+idna = ">=2.5,<3"
 urllib3 = ">=1.21.1,<1.25.0 || >1.25.0,<1.25.1 || >1.25.1,<1.26"
 
 [package.extras]
-security = ["pyOpenSSL (>=0.14)", "cryptography (>=1.3.4)", "idna (>=2.0.0)"]
+security = ["pyOpenSSL (>=0.14)", "cryptography (>=1.3.4)"]
 socks = ["PySocks (>=1.5.6,<1.5.7 || >1.5.7)", "win-inet-pton"]
 
 [[package]]
@@ -567,7 +534,7 @@ version = "2019.1.30"
 numpy = ">=1.0.2"
 
 [[package]]
-category = "dev"
+category = "main"
 description = "Image processing routines for SciPy"
 name = "scikit-image"
 optional = false
@@ -599,28 +566,28 @@ version = "1.4.1"
 numpy = ">=1.13.3"
 
 [[package]]
-category = "dev"
+category = "main"
 description = "Python 2 and 3 compatibility utilities"
 name = "six"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*"
-version = "1.14.0"
+version = "1.15.0"
 
 [[package]]
-category = "dev"
+category = "main"
 description = "This package provides 26 stemmers for 25 languages generated from Snowball algorithms."
 name = "snowballstemmer"
-optional = false
+optional = true
 python-versions = "*"
 version = "2.0.0"
 
 [[package]]
-category = "dev"
+category = "main"
 description = "Python documentation generator"
 name = "sphinx"
-optional = false
+optional = true
 python-versions = ">=3.5"
-version = "2.3.1"
+version = "2.4.4"
 
 [package.dependencies]
 Jinja2 = ">=2.3"
@@ -643,46 +610,49 @@ sphinxcontrib-serializinghtml = "*"
 
 [package.extras]
 docs = ["sphinxcontrib-websupport"]
-test = ["pytest", "pytest-cov", "html5lib", "flake8 (>=3.5.0)", "flake8-import-order", "mypy (>=0.761)", "docutils-stubs"]
+test = ["pytest (<5.3.3)", "pytest-cov", "html5lib", "flake8 (>=3.5.0)", "flake8-import-order", "mypy (>=0.761)", "docutils-stubs"]
 
 [[package]]
-category = "dev"
-description = ""
+category = "main"
+description = "sphinxcontrib-applehelp is a sphinx extension which outputs Apple help books"
 name = "sphinxcontrib-applehelp"
-optional = false
-python-versions = "*"
-version = "1.0.1"
+optional = true
+python-versions = ">=3.5"
+version = "1.0.2"
 
 [package.extras]
-test = ["pytest", "flake8", "mypy"]
+lint = ["flake8", "mypy", "docutils-stubs"]
+test = ["pytest"]
 
 [[package]]
-category = "dev"
-description = ""
+category = "main"
+description = "sphinxcontrib-devhelp is a sphinx extension which outputs Devhelp document."
 name = "sphinxcontrib-devhelp"
-optional = false
-python-versions = "*"
-version = "1.0.1"
+optional = true
+python-versions = ">=3.5"
+version = "1.0.2"
 
 [package.extras]
-test = ["pytest", "flake8", "mypy"]
+lint = ["flake8", "mypy", "docutils-stubs"]
+test = ["pytest"]
 
 [[package]]
-category = "dev"
-description = ""
+category = "main"
+description = "sphinxcontrib-htmlhelp is a sphinx extension which renders HTML help files"
 name = "sphinxcontrib-htmlhelp"
-optional = false
-python-versions = "*"
-version = "1.0.2"
+optional = true
+python-versions = ">=3.5"
+version = "1.0.3"
 
 [package.extras]
-test = ["pytest", "flake8", "mypy", "html5lib"]
+lint = ["flake8", "mypy", "docutils-stubs"]
+test = ["pytest", "html5lib"]
 
 [[package]]
-category = "dev"
+category = "main"
 description = "A sphinx extension which renders display math in HTML via JavaScript"
 name = "sphinxcontrib-jsmath"
-optional = false
+optional = true
 python-versions = ">=3.5"
 version = "1.0.1"
 
@@ -690,46 +660,40 @@ version = "1.0.1"
 test = ["pytest", "flake8", "mypy"]
 
 [[package]]
-category = "dev"
-description = ""
+category = "main"
+description = "sphinxcontrib-qthelp is a sphinx extension which outputs QtHelp document."
 name = "sphinxcontrib-qthelp"
-optional = false
-python-versions = "*"
-version = "1.0.2"
+optional = true
+python-versions = ">=3.5"
+version = "1.0.3"
 
 [package.extras]
-test = ["pytest", "flake8", "mypy"]
+lint = ["flake8", "mypy", "docutils-stubs"]
+test = ["pytest"]
 
 [[package]]
-category = "dev"
-description = ""
+category = "main"
+description = "sphinxcontrib-serializinghtml is a sphinx extension which outputs \"serialized\" HTML files (json and pickle)."
 name = "sphinxcontrib-serializinghtml"
-optional = false
-python-versions = "*"
-version = "1.1.3"
+optional = true
+python-versions = ">=3.5"
+version = "1.1.4"
 
 [package.extras]
-test = ["pytest", "flake8", "mypy"]
-
-[[package]]
-category = "dev"
-description = "Python Library for Tom's Obvious, Minimal Language"
-name = "toml"
-optional = false
-python-versions = "*"
-version = "0.10.0"
+lint = ["flake8", "mypy", "docutils-stubs"]
+test = ["pytest"]
 
 [[package]]
-category = "dev"
+category = "main"
 description = "HTTP library with thread-safe connection pooling, file post, and more."
 name = "urllib3"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, <4"
-version = "1.25.8"
+version = "1.25.9"
 
 [package.extras]
 brotli = ["brotlipy (>=0.6.0)"]
-secure = ["pyOpenSSL (>=0.14)", "cryptography (>=1.3.4)", "idna (>=2.0.0)", "certifi", "ipaddress"]
+secure = ["certifi", "cryptography (>=1.3.4)", "idna (>=2.0.0)", "pyOpenSSL (>=0.14)", "ipaddress"]
 socks = ["PySocks (>=1.5.6,<1.5.7 || >1.5.7,<2.0)"]
 
 [[package]]
@@ -738,7 +702,7 @@ description = "Measures number of Terminal column cells of wide-character codes"
 name = "wcwidth"
 optional = false
 python-versions = "*"
-version = "0.1.8"
+version = "0.1.9"
 
 [[package]]
 category = "main"
@@ -746,14 +710,17 @@ description = "Backport of pathlib-compatible object wrapper for zip files"
 name = "zipp"
 optional = false
 python-versions = ">=3.6"
-version = "2.1.0"
+version = "3.1.0"
 
 [package.extras]
 docs = ["sphinx", "jaraco.packaging (>=3.2)", "rst.linker (>=1.9)"]
-testing = ["jaraco.itertools"]
+testing = ["jaraco.itertools", "func-timeout"]
+
+[extras]
+docs = ["sphinx", "numpydoc", "m2r", "matplotlib", "scikit-image"]
 
 [metadata]
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 wcwidth = [
-    {file = "wcwidth-0.1.8-py2.py3-none-any.whl", hash = "sha256:8fd29383f539be45b20bd4df0dc29c20ba48654a41e661925e612311e9f3c603"},
-    {file = "wcwidth-0.1.8.tar.gz", hash = "sha256:f28b3e8a6483e5d49e7f8949ac1a78314e740333ae305b4ba5defd3e74fb37a8"},
+    {file = "wcwidth-0.1.9-py2.py3-none-any.whl", hash = "sha256:cafe2186b3c009a04067022ce1dcd79cb38d8d65ee4f4791b8888d6599d1bbe1"},
+    {file = "wcwidth-0.1.9.tar.gz", hash = "sha256:ee73862862a156bf77ff92b09034fc4825dd3af9cf81bc5b360668d425f3c5f1"},
 ]
 zipp = [
-    {file = "zipp-2.1.0-py3-none-any.whl", hash = "sha256:ccc94ed0909b58ffe34430ea5451f07bc0c76467d7081619a454bf5c98b89e28"},
-    {file = "zipp-2.1.0.tar.gz", hash = "sha256:feae2f18633c32fc71f2de629bfb3bd3c9325cd4419642b1f1da42ee488d9b98"},
+    {file = "zipp-3.1.0-py3-none-any.whl", hash = "sha256:aa36550ff0c0b7ef7fa639055d797116ee891440eac1a56f378e2d3179e0320b"},
+    {file = "zipp-3.1.0.tar.gz", hash = "sha256:c599e4d75c98f6798c509911d08a22e6c021d074469042177c8c86fb92eefd96"},
 ]
diff --git a/pyproject.toml b/pyproject.toml
index 51f6270..2d67791 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "scikit-mpe"
-version = "0.2.0"
+version = "0.2.1"
 description = "Minimal path extraction using the fast marching method"
 authors = ["Eugene Prilepin <esp.home@gmail.com>"]
 license = "MIT"
@@ -40,21 +40,25 @@ scikit-fmm = "^2019.1.30"
 pydantic = "^1.4"
 importlib-metadata = "^1.6.0"
 
+# docs
+sphinx = { version = "^2.3.1", optional = true }
+numpydoc = { version = "^0.9.2", optional = true }
+m2r = { version = "^0.2.1", optional = true }
+matplotlib = { version = "^3.1.3", optional = true }
+scikit-image = { version = "^0.16.2", optional = true }
+
 [tool.poetry.dev-dependencies]
 flake8 = "^3.7.9"
 flake8-colors = "^0.1.6"
 
 pytest = "^5.3.5"
-pytest-benchmark = "^3.2.3"
 pytest-cov = "^2.8.1"
 coveralls = "^1.10.0"
 
-sphinx = "^2.3.1"
-numpydoc = "^0.9.2"
-toml = "^0.10.0"
-matplotlib = "^3.1.3"
 scikit-image = "^0.16.2"
-m2r = "^0.2.1"
+
+[tool.poetry.extras]
+docs = ["sphinx", "numpydoc", "m2r", "matplotlib", "scikit-image"]
 
 [build-system]
 requires = ["poetry>=0.12"]
diff --git a/skmpe/__init__.py b/skmpe/__init__.py
index fae45be..7b9b8ef 100644
--- a/skmpe/__init__.py
+++ b/skmpe/__init__.py
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 
-from importlib_metadata import metadata, PackageNotFoundError
+from importlib_metadata import version, PackageNotFoundError
 
 from ._base import (
     InitialInfo,
@@ -32,7 +32,7 @@
 
 
 try:
-    __version__ = metadata('scikit-mpe')['version']
+    __version__ = version('scikit-mpe')
 except PackageNotFoundError:  # pragma: no cover
     __version__ = '0.0.0.dev'
 
diff --git a/tox.ini b/tox.ini
index 05f4520..e442f7f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,29 +7,25 @@ basepython = python3
 
 [testenv]
 recreate = true
-whitelist_externals = poetry
 skip_install = true
+whitelist_externals = poetry
 
 commands =
     poetry install
-    poetry run pytest tests/ --color=yes {posargs} -v
+    poetry run pytest tests/ -v --color=yes {posargs}
 
 [testenv:py37-pytest-coverage]
-recreate = true
-whitelist_externals = poetry
-skip_install = true
 passenv = TRAVIS TRAVIS_*
 
 commands =
     poetry install
-    poetry run pytest tests/ --cov=skmpe --color=yes {posargs} -v
+    poetry run pytest tests/ -v --color=yes --cov=skmpe {posargs}
     coveralls
 
 [testenv:docs]
-whitelist_externals = make
 commands =
-    poetry install
-    make -C docs/ html
+    poetry install --no-dev --extras docs
+    poetry run make -C docs/ html
 
 [testenv:flake8]
 deps =