diff --git a/cenv_tool/schemata.py b/cenv_tool/schemata.py
index 80c8b03..3c70ddd 100644
--- a/cenv_tool/schemata.py
+++ b/cenv_tool/schemata.py
@@ -55,12 +55,22 @@ class SNRequirements(Schema):
         fields.String(
             strict=True,
             required=True,
-            validate=lambda x: '=' in x if 'python ' not in x else True,
+            validate=lambda x: '=' in x if 'python' not in x else True,
             error_messages=dict(validator_failed='Version must be specified'),
         ),
         strict=True,
         required=True,
     )
+    run_constrained = fields.List(
+        fields.String(
+            strict=True,
+            required=False,
+            validate=lambda x: '=' in x,
+            error_messages=dict(validator_failed='Version must be specified'),
+        ),
+        strict=True,
+        required=False,
+    )
 
 
 class SNTest(Schema):
diff --git a/cenv_tool/utils.py b/cenv_tool/utils.py
index d2dd245..8207f24 100644
--- a/cenv_tool/utils.py
+++ b/cenv_tool/utils.py
@@ -133,6 +133,11 @@ def extract_dependencies_from_meta_yaml(meta_yaml_content: dict) -> List[str]:
         )
     )
 
+    if meta_yaml_content['requirements'].get('run_constrained'):
+        dependencies.extend(
+            meta_yaml_content['requirements']['run_constrained']
+        )
+
     if meta_yaml_content['extra'].get('dev_requirements'):
         dependencies.extend(meta_yaml_content['extra']['dev_requirements'])
 
diff --git a/docs/_static/coverage.svg b/docs/_static/coverage.svg
index 59d64b3..5b40c8f 100644
--- a/docs/_static/coverage.svg
+++ b/docs/_static/coverage.svg
@@ -9,13 +9,13 @@
     </mask>
     <g mask="url(#a)">
         <path fill="#555" d="M0 0h63v20H0z"/>
-        <path fill="#97CA00" d="M63 0h36v20H63z"/>
+        <path fill="#a4a61d" d="M63 0h36v20H63z"/>
         <path fill="url(#b)" d="M0 0h99v20H0z"/>
     </g>
     <g fill="#fff" text-anchor="middle" font-family="DejaVu Sans,Verdana,Geneva,sans-serif" font-size="11">
         <text x="31.5" y="15" fill="#010101" fill-opacity=".3">coverage</text>
         <text x="31.5" y="14">coverage</text>
-        <text x="80" y="15" fill="#010101" fill-opacity=".3">93%</text>
-        <text x="80" y="14">93%</text>
+        <text x="80" y="15" fill="#010101" fill-opacity=".3">83%</text>
+        <text x="80" y="14">83%</text>
     </g>
 </svg>
diff --git a/docs/requirements.txt b/docs/requirements.txt
index cccd79f..17d5092 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,16 +1,16 @@
-attrs==19.*,>=19.0.0
-coverage-badge==1.*,>=1.0.0
+attrs>=19
+coverage>=4
+coverage-badge>=1
 ipython>=7
 jinja2>=2
 marshmallow<3,>=2.19
-monkeytype>=19
-pylint>=2
-pytest==5.*,>=5.0.0
-pytest-cov==2.*,>=2.0.0
-pytest-datafiles==2.*,>=2.0.0
+pylint>=2.4
+pytest>=5
+pytest-cov>=2
+pytest-datafiles>=2
 pyyaml==5.*,>=5.0.0
 six>=1.12
-sphinx==2.*,>=2.0.0
-sphinx-autodoc-typehints==1.*,>=1.0.0
-sphinx-rtd-theme==0.*,>=0.0.0
+sphinx>=2
+sphinx-autodoc-typehints>=1.8.0
+sphinx-rtd-theme>=0
 yapf>=0
diff --git a/docs/usage.rst b/docs/usage.rst
index cea6122..20b23b5 100644
--- a/docs/usage.rst
+++ b/docs/usage.rst
@@ -77,15 +77,17 @@ A meta.yaml valid for cenv should look like the following:
 
     requirements:
         build:
-          - python 3.6.8
-          - pip
-          - setuptools
+            - python
+            - pip
+            - setuptools
         run:
-          - python 3.6.8
-          - attrs >=18.2,<19
-          - jinja2 >=2.10
-          - six >=1.12.0
-          - yaml >=0.1.7
+            - python
+            - attrs >=18.2,<19
+            - jinja2 >=2.10
+            - six >=1.12.0
+            - yaml >=0.1.7
+        run_constrained:
+            - pandas >=0.23
 
     test:
         imports:
@@ -93,7 +95,7 @@ A meta.yaml valid for cenv should look like the following:
 
     extra:
         env_name: example
-        python: 3.6
+        python: 3.6.8
         dev_requirements:
             - ipython >=7
 
@@ -107,6 +109,8 @@ A meta.yaml valid for cenv should look like the following:
         - package >=0.1
 
     The same is required for the ``extra:dev_requirements``-section.
+    If the section ``requirements:run_constrained`` is defined, too, these
+    dependency information is extracted for dependency collection, too.
     Not defining a version will not create or update a conda-environment,
     because this is not the purpose of the conda-usage.
     The validity of the ``meta.yaml`` is checked in ``cenv`` using the
diff --git a/poetry.lock b/poetry.lock
index 644af77..66b7da5 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,3 +1,11 @@
+[[package]]
+category = "dev"
+description = "A configurable sidebar-enabled Sphinx theme"
+name = "alabaster"
+optional = false
+python-versions = "*"
+version = "0.7.12"
+
 [[package]]
 category = "dev"
 description = "Disable App Nap on OS X 10.9"
@@ -12,14 +20,17 @@ category = "dev"
 description = "An abstract syntax tree for Python with inference support."
 name = "astroid"
 optional = false
-python-versions = ">=3.4.*"
-version = "2.2.5"
+python-versions = ">=3.5.*"
+version = "2.3.2"
 
 [package.dependencies]
-lazy-object-proxy = "*"
-six = "*"
-typed-ast = ">=1.3.0"
-wrapt = "*"
+lazy-object-proxy = ">=1.4.0,<1.5.0"
+six = "1.12"
+wrapt = ">=1.11.0,<1.12.0"
+
+[package.dependencies.typed-ast]
+python = "<3.8"
+version = ">=1.4.0,<1.5"
 
 [[package]]
 category = "dev"
@@ -35,7 +46,18 @@ description = "Classes Without Boilerplate"
 name = "attrs"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "19.1.0"
+version = "19.3.0"
+
+[[package]]
+category = "dev"
+description = "Internationalization utilities"
+name = "babel"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "2.7.0"
+
+[package.dependencies]
+pytz = ">=2015.7"
 
 [[package]]
 category = "dev"
@@ -47,11 +69,19 @@ version = "0.1.0"
 
 [[package]]
 category = "dev"
-description = "Composable command line interface toolkit"
-name = "click"
+description = "Python package for providing Mozilla's CA Bundle."
+name = "certifi"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "7.0"
+python-versions = "*"
+version = "2019.9.11"
+
+[[package]]
+category = "dev"
+description = "Universal encoding detector for Python 2 and 3"
+name = "chardet"
+optional = false
+python-versions = "*"
+version = "3.0.4"
 
 [[package]]
 category = "dev"
@@ -67,8 +97,8 @@ category = "dev"
 description = "Code coverage measurement for Python"
 name = "coverage"
 optional = false
-python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*, <4"
-version = "4.5.4"
+python-versions = "*"
+version = "4.4.2"
 
 [[package]]
 category = "dev"
@@ -86,13 +116,38 @@ optional = false
 python-versions = ">=2.6, !=3.0.*, !=3.1.*"
 version = "4.4.0"
 
+[[package]]
+category = "dev"
+description = "Docutils -- Python Documentation Utilities"
+name = "docutils"
+optional = false
+python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
+version = "0.15.2"
+
+[[package]]
+category = "dev"
+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"
+
+[[package]]
+category = "dev"
+description = "Getting image size from png/jpeg/jpeg2000/gif file"
+name = "imagesize"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "1.1.0"
+
 [[package]]
 category = "dev"
 description = "Read metadata from Python packages"
+marker = "python_version < \"3.8\""
 name = "importlib-metadata"
 optional = false
 python-versions = ">=2.7,!=3.0,!=3.1,!=3.2,!=3.3"
-version = "0.19"
+version = "0.23"
 
 [package.dependencies]
 zipp = ">=0.5"
@@ -103,7 +158,7 @@ description = "IPython: Productive Interactive Computing"
 name = "ipython"
 optional = false
 python-versions = ">=3.5"
-version = "7.7.0"
+version = "7.8.0"
 
 [package.dependencies]
 appnope = "*"
@@ -140,18 +195,18 @@ description = "An autocompletion tool for Python that can be used for text edito
 name = "jedi"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "0.14.1"
+version = "0.15.1"
 
 [package.dependencies]
 parso = ">=0.5.0"
 
 [[package]]
 category = "main"
-description = "A small but fast and easy to use stand-alone template engine written in pure python."
+description = "A very fast and expressive template engine."
 name = "jinja2"
 optional = false
 python-versions = "*"
-version = "2.10.1"
+version = "2.10.3"
 
 [package.dependencies]
 MarkupSafe = ">=0.23"
@@ -162,30 +217,7 @@ 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 = "1.4.1"
-
-[[package]]
-category = "dev"
-description = "Python LiveReload is an awesome tool for web developers"
-name = "livereload"
-optional = false
-python-versions = "*"
-version = "2.6.1"
-
-[package.dependencies]
-six = "*"
-tornado = "*"
-
-[[package]]
-category = "dev"
-description = "Python implementation of Markdown."
-name = "markdown"
-optional = false
-python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*"
-version = "3.1.1"
-
-[package.dependencies]
-setuptools = ">=36"
+version = "1.4.2"
 
 [[package]]
 category = "main"
@@ -201,7 +233,7 @@ description = "A lightweight library for converting complex datatypes to and fro
 name = "marshmallow"
 optional = false
 python-versions = "*"
-version = "2.19.5"
+version = "2.20.5"
 
 [[package]]
 category = "dev"
@@ -213,38 +245,23 @@ version = "0.6.1"
 
 [[package]]
 category = "dev"
-description = "Project documentation with Markdown."
-name = "mkdocs"
+description = "More routines for operating on iterables, beyond itertools"
+name = "more-itertools"
 optional = false
-python-versions = ">=2.7.9,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*"
-version = "1.0.4"
-
-[package.dependencies]
-Jinja2 = ">=2.7.1"
-Markdown = ">=2.3.1"
-PyYAML = ">=3.10"
-click = ">=3.3"
-livereload = ">=2.5.1"
-tornado = ">=5.0"
+python-versions = ">=3.4"
+version = "7.2.0"
 
 [[package]]
 category = "dev"
-description = "Generating type annotations from sampled production types"
-name = "monkeytype"
+description = "Core utilities for Python packages"
+name = "packaging"
 optional = false
-python-versions = ">=3.6"
-version = "19.5.0"
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "19.2"
 
 [package.dependencies]
-retype = "*"
-
-[[package]]
-category = "dev"
-description = "More routines for operating on iterables, beyond itertools"
-name = "more-itertools"
-optional = false
-python-versions = ">=3.4"
-version = "7.2.0"
+pyparsing = ">=2.0.2"
+six = "*"
 
 [[package]]
 category = "dev"
@@ -280,18 +297,20 @@ 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 = "0.12.0"
+version = "0.13.0"
 
 [package.dependencies]
-importlib-metadata = ">=0.12"
+[package.dependencies.importlib-metadata]
+python = "<3.8"
+version = ">=0.12"
 
 [[package]]
 category = "dev"
 description = "Library for building powerful interactive command lines in Python"
 name = "prompt-toolkit"
 optional = false
-python-versions = "*"
-version = "2.0.9"
+python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
+version = "2.0.10"
 
 [package.dependencies]
 six = ">=1.9.0"
@@ -314,20 +333,6 @@ optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 version = "1.8.0"
 
-[[package]]
-category = "dev"
-description = "Create Python API documentation in Markdown format"
-name = "pydoc-markdown"
-optional = false
-python-versions = "*"
-version = "2.0.5"
-
-[package.dependencies]
-Markdown = ">=2.6.11"
-MkDocs = ">=0.16.0"
-PyYAML = ">=3.12"
-six = ">=0.11.0"
-
 [[package]]
 category = "dev"
 description = "Pygments is a syntax highlighting package written in Python."
@@ -341,32 +346,44 @@ category = "dev"
 description = "python code static checker"
 name = "pylint"
 optional = false
-python-versions = ">=3.4.*"
-version = "2.3.1"
+python-versions = ">=3.5.*"
+version = "2.4.3"
 
 [package.dependencies]
-astroid = ">=2.2.0,<3"
+astroid = ">=2.3.0,<2.4"
 colorama = "*"
 isort = ">=4.2.5,<5"
 mccabe = ">=0.6,<0.7"
 
+[[package]]
+category = "dev"
+description = "Python parsing module"
+name = "pyparsing"
+optional = false
+python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
+version = "2.4.2"
+
 [[package]]
 category = "dev"
 description = "pytest: simple powerful testing with Python"
 name = "pytest"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "3.10.1"
+python-versions = ">=3.5"
+version = "5.2.1"
 
 [package.dependencies]
 atomicwrites = ">=1.0"
 attrs = ">=17.4.0"
 colorama = "*"
 more-itertools = ">=4.0.0"
-pluggy = ">=0.7"
+packaging = "*"
+pluggy = ">=0.12,<1.0"
 py = ">=1.5.0"
-setuptools = "*"
-six = ">=1.10.0"
+wcwidth = "*"
+
+[package.dependencies.importlib-metadata]
+python = "<3.8"
+version = ">=0.12"
 
 [[package]]
 category = "dev"
@@ -374,7 +391,7 @@ description = "Pytest plugin for measuring coverage."
 name = "pytest-cov"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "2.7.1"
+version = "2.8.1"
 
 [package.dependencies]
 coverage = ">=4.4"
@@ -394,6 +411,14 @@ pytest = ">=3.6"
 
 [[package]]
 category = "dev"
+description = "World timezone definitions, modern and historical"
+name = "pytz"
+optional = false
+python-versions = "*"
+version = "2019.3"
+
+[[package]]
+category = "main"
 description = "YAML parser and emitter for Python"
 name = "pyyaml"
 optional = false
@@ -402,53 +427,130 @@ version = "5.1.2"
 
 [[package]]
 category = "dev"
-description = "Re-apply types from .pyi stub files to your codebase."
-name = "retype"
+description = "Python HTTP for Humans."
+name = "requests"
 optional = false
-python-versions = "*"
-version = "17.12.0"
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+version = "2.22.0"
 
 [package.dependencies]
-click = "*"
-typed-ast = "*"
+certifi = ">=2017.4.17"
+chardet = ">=3.0.2,<3.1.0"
+idna = ">=2.5,<2.9"
+urllib3 = ">=1.21.1,<1.25.0 || >1.25.0,<1.25.1 || >1.25.1,<1.26"
 
 [[package]]
 category = "main"
-description = "ruamel.yaml is a YAML parser/emitter that supports roundtrip preservation of comments, seq/map flow style, and map key order"
-name = "ruamel.yaml"
+description = "Python 2 and 3 compatibility utilities"
+name = "six"
+optional = false
+python-versions = ">=2.6, !=3.0.*, !=3.1.*"
+version = "1.12.0"
+
+[[package]]
+category = "dev"
+description = "This package provides 26 stemmers for 25 languages generated from Snowball algorithms."
+name = "snowballstemmer"
 optional = false
 python-versions = "*"
-version = "0.16.1"
+version = "2.0.0"
+
+[[package]]
+category = "dev"
+description = "Python documentation generator"
+name = "sphinx"
+optional = false
+python-versions = ">=3.5"
+version = "2.2.0"
 
 [package.dependencies]
-[package.dependencies."ruamel.yaml.clib"]
-python = "<3.8"
-version = ">=0.1.2"
+Jinja2 = ">=2.3"
+Pygments = ">=2.0"
+alabaster = ">=0.7,<0.8"
+babel = ">=1.3,<2.0 || >2.0"
+colorama = ">=0.3.5"
+docutils = ">=0.12"
+imagesize = "*"
+packaging = "*"
+requests = ">=2.5.0"
+setuptools = "*"
+snowballstemmer = ">=1.1"
+sphinxcontrib-applehelp = "*"
+sphinxcontrib-devhelp = "*"
+sphinxcontrib-htmlhelp = "*"
+sphinxcontrib-jsmath = "*"
+sphinxcontrib-qthelp = "*"
+sphinxcontrib-serializinghtml = "*"
 
 [[package]]
-category = "main"
-description = "C version of reader, parser and emitter for ruamel.yaml derived from libyaml"
-marker = "platform_python_implementation == \"CPython\" and python_version < \"3.8\""
-name = "ruamel.yaml.clib"
+category = "dev"
+description = "Type hints (PEP 484) support for the Sphinx autodoc extension"
+name = "sphinx-autodoc-typehints"
+optional = false
+python-versions = ">=3.5.2"
+version = "1.8.0"
+
+[package.dependencies]
+Sphinx = ">=2.1"
+
+[[package]]
+category = "dev"
+description = "Read the Docs theme for Sphinx"
+name = "sphinx-rtd-theme"
 optional = false
 python-versions = "*"
-version = "0.1.2"
+version = "0.4.3"
+
+[package.dependencies]
+sphinx = "*"
 
 [[package]]
-category = "main"
-description = "Python 2 and 3 compatibility utilities"
-name = "six"
+category = "dev"
+description = ""
+name = "sphinxcontrib-applehelp"
 optional = false
-python-versions = ">=2.6, !=3.0.*, !=3.1.*"
-version = "1.12.0"
+python-versions = "*"
+version = "1.0.1"
+
+[[package]]
+category = "dev"
+description = ""
+name = "sphinxcontrib-devhelp"
+optional = false
+python-versions = "*"
+version = "1.0.1"
 
 [[package]]
 category = "dev"
-description = "Tornado is a Python web framework and asynchronous networking library, originally developed at FriendFeed."
-name = "tornado"
+description = ""
+name = "sphinxcontrib-htmlhelp"
 optional = false
-python-versions = ">= 3.5"
-version = "6.0.3"
+python-versions = "*"
+version = "1.0.2"
+
+[[package]]
+category = "dev"
+description = "A sphinx extension which renders display math in HTML via JavaScript"
+name = "sphinxcontrib-jsmath"
+optional = false
+python-versions = ">=3.5"
+version = "1.0.1"
+
+[[package]]
+category = "dev"
+description = ""
+name = "sphinxcontrib-qthelp"
+optional = false
+python-versions = "*"
+version = "1.0.2"
+
+[[package]]
+category = "dev"
+description = ""
+name = "sphinxcontrib-serializinghtml"
+optional = false
+python-versions = "*"
+version = "1.1.3"
 
 [[package]]
 category = "dev"
@@ -456,7 +558,7 @@ description = "Traitlets Python config system"
 name = "traitlets"
 optional = false
 python-versions = "*"
-version = "4.3.2"
+version = "4.3.3"
 
 [package.dependencies]
 decorator = "*"
@@ -466,11 +568,20 @@ six = "*"
 [[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 = "1.4.0"
 
+[[package]]
+category = "dev"
+description = "HTTP library with thread-safe connection pooling, file post, and more."
+name = "urllib3"
+optional = false
+python-versions = "*"
+version = "1.22"
+
 [[package]]
 category = "dev"
 description = "Measures number of Terminal column cells of wide-character codes"
@@ -498,66 +609,83 @@ version = "0.28.0"
 [[package]]
 category = "dev"
 description = "Backport of pathlib-compatible object wrapper for zip files"
+marker = "python_version < \"3.8\""
 name = "zipp"
 optional = false
 python-versions = ">=2.7"
-version = "0.5.2"
+version = "0.6.0"
+
+[package.dependencies]
+more-itertools = "*"
 
 [extras]
 docs = []
+tests = []
 
 [metadata]
-content-hash = "e22c73191a4da9993606ee107a024cdfb23a4a67294465ee622ee2d2ee961feb"
-python-versions = "^3.7"
+content-hash = "4e1befcd49dcc1ccc1e38a51bdc00f6af3c820bf82b9f57883e173f147e42dc9"
+python-versions = ">=3.7"
 
 [metadata.hashes]
+alabaster = ["446438bdcca0e05bd45ea2de1668c1d9b032e1a9154c2c259092d77031ddd359", "a661d72d58e6ea8a57f7a86e37d86716863ee5e92788398526d58b26a4e4dc02"]
 appnope = ["5b26757dc6f79a3b7dc9fab95359328d5747fcb2409d331ea66d0272b90ab2a0", "8b995ffe925347a2138d7ac0fe77155e4311a0ea6d6da4f5128fe4b3cbe5ed71"]
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 pytest-datafiles = ["143329cbb1dbbb07af24f88fa4668e2f59ce233696cf12c49fd1c98d1756dbf9", "e349b6ad7bcca111f3677b7201d3ca81f93b5e09dcfae8ee2be2c3cae9f55bc7"]
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 wrapt = ["565a021fd19419476b9362b05eeaa094178de64f8361e44468f9e9d7843901e1"]
 yapf = ["02ace10a00fa2e36c7ebd1df2ead91dbfbd7989686dc4ccbdc549e95d19f5780", "6f94b6a176a7c114cfa6bad86d40f259bbe0f10cf2fa7f2f4b3596fc5802a41b"]
-zipp = ["4970c3758f4e89a7857a973b1e2a5d75bcdc47794442f2e2dd4fe8e0466e809a", "8a5712cfd3bb4248015eb3b0b3c54a5f6ee3f2425963ef2a0125b8bc40aafaec"]
+zipp = ["3718b1cbcd963c7d4c5511a8240812904164b7f381b647143a89d3b98f9bcd8e", "f06903e9f1f43b12d371004b4ac7b06ab39a44adc747266928ae6debfa7b3335"]
diff --git a/pyproject.toml b/pyproject.toml
index 04e1e9d..89bb51f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "cenv_tool"
-version = "2.0.0"
+version = "2.1.0"
 description = "conda environment creation and update from meta.yaml"
 license = "MIT"
 authors = ["Simon Kallfass <skallfass@ouroboros.info>"]
@@ -16,8 +16,8 @@ classifiers = [
 
 
 [tool.poetry.dependencies]
-python = "==3.*,>=3.7"
-attrs = "==19.*,>=19.0"
+python = ">=3.7"
+attrs = ">=19"
 jinja2 = ">=2"
 pyyaml = "^5"
 six = ">=1.12"
@@ -28,13 +28,13 @@ marshmallow = ">=2.19,<3"
 coverage = ">=4"
 coverage-badge = ">=1"
 ipython = ">=7"
-pylint = "<2.4,==2.*"
-pytest = "==5.*,>=5.0.0"
+pylint = ">=2.4"
+pytest = ">=5"
 pytest-cov = ">=2"
 pytest-datafiles = ">=2"
 yapf = ">=0"
-sphinx = "==2.*,>=2.0.0"
-sphinx-autodoc-typehints = "<1.8.0,==1.*"
+sphinx = ">=2"
+sphinx-autodoc-typehints = ">=1.8.0"
 sphinx_rtd_theme = ">=0"
 
 
diff --git a/setup.py b/setup.py
index 881d713..967dd93 100644
--- a/setup.py
+++ b/setup.py
@@ -21,9 +21,9 @@
 setup(
     long_description=readme,
     name='cenv_tool',
-    version='2.0.0',
+    version='2.1.0',
     description='conda environment creation and update from meta.yaml',
-    python_requires='==3.*,>=3.7',
+    python_requires='>=3.7',
     project_urls={
         'homepage': 'https://www.cenv.ouroboros.info',
         'repository': 'https://github.com/skallfass/cenv_tool'
@@ -45,21 +45,19 @@
     packages=['cenv_tool'],
     package_data={'cenv_tool': ['*.sh', '*.yml']},
     install_requires=[
-        'attrs==19.*,>=19.0', 'jinja2>=2', 'marshmallow<3,>=2.19',
-        'pyyaml==5.*,>=5.0.0', 'six>=1.12'
+        'attrs>=19', 'jinja2>=2', 'marshmallow<3,>=2.19', 'pyyaml==5.*,>=5.0.0',
+        'six>=1.12'
     ],
     extras_require={
         'tests': [
-            'coverage>=4', 'coverage-badge>=1', 'pytest==5.*,>=5.0.0',
-            'pytest-cov>=2', 'pytest-datafiles>=2'
+            'coverage>=4', 'coverage-badge>=1', 'pytest>=5', 'pytest-cov>=2',
+            'pytest-datafiles>=2'
         ],
         'dev': [
-            'coverage>=4', 'coverage-badge>=1', 'ipython>=7',
-            'pylint<2.4,==2.*', 'pytest==5.*,>=5.0.0', 'pytest-cov>=2',
-            'pytest-datafiles>=2', 'sphinx==2.*,>=2.0.0',
-            'sphinx-autodoc-typehints<1.8.0,==1.*', 'sphinx-rtd-theme>=0',
-            'yapf>=0'
+            'coverage>=4', 'coverage-badge>=1', 'ipython>=7', 'pylint>=2.4',
+            'pytest>=5', 'pytest-cov>=2', 'pytest-datafiles>=2', 'sphinx>=2',
+            'sphinx-autodoc-typehints>=1.8.0', 'sphinx-rtd-theme>=0', 'yapf>=0'
         ],
-        'docs': ['sphinx==2.*,>=2.0.0', 'sphinx-autodoc-typehints<1.8.0,==1.*']
+        'docs': ['sphinx>=2', 'sphinx-autodoc-typehints>=1.8.0']
     },
 )
diff --git a/tests/testproject/conda-build/meta.yaml b/tests/testproject/conda-build/meta.yaml
index f264ea2..fe6adc9 100644
--- a/tests/testproject/conda-build/meta.yaml
+++ b/tests/testproject/conda-build/meta.yaml
@@ -12,19 +12,21 @@ build:
     preserve_egg_dir: True
     script: python -m pip install --no-deps --ignore-installed .
     entry_points:
-      - testproject = testproject.testproject:main
+        - testproject = testproject.testproject:main
 
 requirements:
     build:
-      - python 3.7.3
-      - pip
-      - setuptools
+        - python
+        - pip
+        - setuptools
     run:
-      - python 3.7.3
-      - attrs >=19
-      - jinja2 >=2.10
-      - six >=1.12.0
-      - yaml >=0.1.7
+        - python
+        - attrs >=19
+        - jinja2 >=2.10
+        - six >=1.12.0
+        - yaml >=0.1.7
+    run_constrained:
+        - pandas >=0.23
 
 test:
     imports:
diff --git a/tests/utils_test.py b/tests/utils_test.py
index 1ab7b48..261339f 100644
--- a/tests/utils_test.py
+++ b/tests/utils_test.py
@@ -19,14 +19,15 @@
             Path('tests/testproject'),
             {
                 'requirements': {
-                    'build': ['python 3.7.3', 'pip', 'setuptools'],
+                    'build': ['python', 'pip', 'setuptools'],
                     'run': [
-                        'python 3.7.3',
+                        'python',
                         'attrs >=19',
                         'jinja2 >=2.10',
                         'six >=1.12.0',
                         'yaml >=0.1.7',
                     ],
+                    'run_constrained': ['pandas >=0.23']
                 },
                 'extra': {
                     'dev_requirements': ['pylint >=2.2.2'],
@@ -80,6 +81,7 @@ def test_read_meta_yaml(
                 'six >=1.12.0',
                 'yaml >=0.1.7',
                 'pylint >=2.2.2',
+                'pandas >=0.23'
             ],
         ),
     ],