diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4e72050..3a42bae 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,14 @@
 
 See also: [Github Release Page](https://github.com/enpaul/tox-poetry-installer/releases).
 
+## Version 0.8.5
+
+View this release on:
+[Github](https://github.com/enpaul/tox-poetry-installer/releases/tag/0.8.5),
+[PyPI](https://pypi.org/project/tox-poetry-installer/0.8.5/)
+
+- Fix Poetry version specification supporting the incompatible Poetry-1.2.0 release
+
 ## Version 0.8.4
 
 View this release on:
diff --git a/poetry.lock b/poetry.lock
index 8f9a3fc..b322039 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -48,7 +48,7 @@ optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [package.extras]
-dev = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface", "furo", "sphinx", "pre-commit"]
+dev = ["coverage[toml] (>=5.0.2)", "furo", "hypothesis", "pre-commit", "pympler", "pytest (>=4.3.0)", "six", "sphinx", "zope.interface"]
 docs = ["furo", "sphinx", "zope.interface"]
 tests = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface"]
 tests_no_zope = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six"]
@@ -104,11 +104,11 @@ uvloop = ["uvloop (>=0.15.2)"]
 
 [[package]]
 name = "blacken-docs"
-version = "1.12.0"
+version = "1.12.1"
 description = "Run `black` on python code blocks in documentation files"
 category = "dev"
 optional = false
-python-versions = ">=3.6.1"
+python-versions = ">=3.7"
 
 [package.dependencies]
 black = ">=19.3b0"
@@ -147,8 +147,8 @@ optional = true
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [package.extras]
-msgpack = ["msgpack-python (>=0.5,<0.6)"]
 memcached = ["python-memcached (>=1.59,<2.0)"]
+msgpack = ["msgpack-python (>=0.5,<0.6)"]
 redis = ["redis (>=3.3.6,<4.0.0)"]
 
 [[package]]
@@ -265,11 +265,11 @@ cffi = ">=1.12"
 
 [package.extras]
 docs = ["sphinx (>=1.6.5,!=1.8.0,!=3.1.0,!=3.1.1)", "sphinx-rtd-theme"]
-docstest = ["pyenchant (>=1.6.11)", "twine (>=1.12.0)", "sphinxcontrib-spelling (>=4.0.1)"]
+docstest = ["pyenchant (>=1.6.11)", "sphinxcontrib-spelling (>=4.0.1)", "twine (>=1.12.0)"]
 pep8test = ["black", "flake8", "flake8-import-order", "pep8-naming"]
 sdist = ["setuptools_rust (>=0.11.4)"]
 ssh = ["bcrypt (>=3.1.5)"]
-test = ["pytest (>=6.2.0)", "pytest-benchmark", "pytest-cov", "pytest-subtests", "pytest-xdist", "pretend", "iso8601", "pytz", "hypothesis (>=1.11.4,!=3.79.2)"]
+test = ["hypothesis (>=1.11.4,!=3.79.2)", "iso8601", "pretend", "pytest (>=6.2.0)", "pytest-benchmark", "pytest-cov", "pytest-subtests", "pytest-xdist", "pytz"]
 
 [[package]]
 name = "decorator"
@@ -311,8 +311,8 @@ packaging = "*"
 toml = "*"
 
 [package.extras]
-pipenv = ["pipenv"]
 conda = ["pyyaml"]
+pipenv = ["pipenv"]
 
 [[package]]
 name = "filelock"
@@ -362,10 +362,10 @@ six = ">=1.9"
 webencodings = "*"
 
 [package.extras]
-lxml = ["lxml"]
-genshi = ["genshi"]
+all = ["chardet (>=2.2)", "genshi", "lxml"]
 chardet = ["chardet (>=2.2)"]
-all = ["lxml", "chardet (>=2.2)", "genshi"]
+genshi = ["genshi"]
+lxml = ["lxml"]
 
 [[package]]
 name = "identify"
@@ -398,8 +398,8 @@ python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
 zipp = ">=0.5"
 
 [package.extras]
-testing = ["importlib-resources (>=1.3)", "pep517", "packaging"]
 docs = ["rst.linker", "sphinx"]
+testing = ["importlib-resources (>=1.3)", "packaging", "pep517"]
 
 [[package]]
 name = "importlib-resources"
@@ -413,8 +413,8 @@ python-versions = ">=3.6"
 zipp = {version = ">=3.1.0", markers = "python_version < \"3.10\""}
 
 [package.extras]
-docs = ["sphinx", "jaraco.packaging (>=8.2)", "rst.linker (>=1.9)"]
-testing = ["pytest (>=6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytest-cov", "pytest-enabler (>=1.0.1)", "pytest-black (>=0.3.7)", "pytest-mypy"]
+docs = ["jaraco.packaging (>=8.2)", "rst.linker (>=1.9)", "sphinx"]
+testing = ["pytest (>=6)", "pytest-black (>=0.3.7)", "pytest-checkdocs (>=2.4)", "pytest-cov", "pytest-enabler (>=1.0.1)", "pytest-flake8", "pytest-mypy"]
 
 [[package]]
 name = "iniconfig"
@@ -451,10 +451,10 @@ doc = ["Sphinx (>=1.3)"]
 kernel = ["ipykernel"]
 nbconvert = ["nbconvert"]
 nbformat = ["nbformat"]
-notebook = ["notebook", "ipywidgets"]
+notebook = ["ipywidgets", "notebook"]
 parallel = ["ipyparallel"]
 qtconsole = ["qtconsole"]
-test = ["nose (>=0.10.1)", "requests", "testpath", "pygments", "nbformat", "ipykernel", "numpy (>=1.17)"]
+test = ["ipykernel", "nbformat", "nose (>=0.10.1)", "numpy (>=1.17)", "pygments", "requests", "testpath"]
 
 [[package]]
 name = "isort"
@@ -465,10 +465,10 @@ optional = false
 python-versions = ">=3.6.1,<4.0"
 
 [package.extras]
-pipfile_deprecated_finder = ["pipreqs", "requirementslib"]
-requirements_deprecated_finder = ["pipreqs", "pip-api"]
 colors = ["colorama (>=0.4.3,<0.5.0)"]
+pipfile_deprecated_finder = ["pipreqs", "requirementslib"]
 plugins = ["setuptools"]
+requirements_deprecated_finder = ["pip-api", "pipreqs"]
 
 [[package]]
 name = "jedi"
@@ -494,8 +494,8 @@ optional = true
 python-versions = ">=3.6"
 
 [package.extras]
+test = ["async-timeout", "pytest", "pytest-asyncio", "pytest-trio", "testpath", "trio"]
 trio = ["async-generator", "trio"]
-test = ["async-timeout", "trio", "testpath", "pytest-asyncio", "pytest-trio", "pytest"]
 
 [[package]]
 name = "keyring"
@@ -512,8 +512,8 @@ pywin32-ctypes = {version = "<0.1.0 || >0.1.0,<0.1.1 || >0.1.1", markers = "sys_
 SecretStorage = {version = ">=3.2", markers = "sys_platform == \"linux\""}
 
 [package.extras]
-docs = ["sphinx", "jaraco.packaging (>=8.2)", "rst.linker (>=1.9)"]
-testing = ["pytest (>=4.6)", "pytest-checkdocs (>=1.2.3)", "pytest-flake8", "pytest-cov", "pytest-enabler", "pytest-black (>=0.3.7)", "pytest-mypy"]
+docs = ["jaraco.packaging (>=8.2)", "rst.linker (>=1.9)", "sphinx"]
+testing = ["pytest (>=4.6)", "pytest-black (>=0.3.7)", "pytest-checkdocs (>=1.2.3)", "pytest-cov", "pytest-enabler", "pytest-flake8", "pytest-mypy"]
 
 [[package]]
 name = "lazy-object-proxy"
@@ -544,11 +544,11 @@ attrs = ">=19,<21"
 mdit-py-plugins = ">=0.2.1,<0.3.0"
 
 [package.extras]
-testing = ["psutil", "pytest-benchmark (>=3.2,<4.0)", "pytest-regressions", "pytest-cov", "pytest (>=3.6,<4)", "coverage"]
-rtd = ["pyyaml", "sphinx (>=2,<4)", "sphinx-copybutton", "sphinx-panels (>=0.4.0,<0.5.0)", "sphinx-book-theme", "myst-nb (>=0.11.1,<0.12.0)"]
-linkify = ["linkify-it-py (>=1.0,<2.0)"]
-compare = ["panflute (>=1.12,<2.0)", "mistletoe-ebp (>=0.10.0,<0.11.0)", "mistune (>=0.8.4,<0.9.0)", "markdown (>=3.2.2,<3.3.0)", "commonmark (>=0.9.1,<0.10.0)"]
 code_style = ["pre-commit (==2.6)"]
+compare = ["commonmark (>=0.9.1,<0.10.0)", "markdown (>=3.2.2,<3.3.0)", "mistletoe-ebp (>=0.10.0,<0.11.0)", "mistune (>=0.8.4,<0.9.0)", "panflute (>=1.12,<2.0)"]
+linkify = ["linkify-it-py (>=1.0,<2.0)"]
+rtd = ["myst-nb (>=0.11.1,<0.12.0)", "pyyaml", "sphinx (>=2,<4)", "sphinx-book-theme", "sphinx-copybutton", "sphinx-panels (>=0.4.0,<0.5.0)"]
+testing = ["coverage", "psutil", "pytest (>=3.6,<4)", "pytest-benchmark (>=3.2,<4.0)", "pytest-cov", "pytest-regressions"]
 
 [[package]]
 name = "matplotlib-inline"
@@ -608,7 +608,7 @@ python-versions = ">=3.6"
 mdformat = ">=0.6.0,<0.7.0"
 
 [package.extras]
-test = ["pytest-cov", "coverage", "pytest (>=6.0,<7.0)"]
+test = ["coverage", "pytest (>=6.0,<7.0)", "pytest-cov"]
 
 [[package]]
 name = "mdit-py-plugins"
@@ -622,8 +622,8 @@ python-versions = "~=3.6"
 markdown-it-py = ">=0.5.8,<2.0.0"
 
 [package.extras]
-testing = ["pytest-regressions", "pytest-cov", "pytest (>=3.6,<4)", "coverage"]
 code_style = ["pre-commit (==2.6)"]
+testing = ["coverage", "pytest (>=3.6,<4)", "pytest-cov", "pytest-regressions"]
 
 [[package]]
 name = "msgpack"
@@ -742,7 +742,7 @@ optional = true
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, !=3.5.*"
 
 [package.extras]
-testing = ["nose", "coverage"]
+testing = ["coverage", "nose"]
 
 [[package]]
 name = "platformdirs"
@@ -753,8 +753,8 @@ optional = false
 python-versions = ">=3.6"
 
 [package.extras]
-test = ["pytest-mock (>=3.6)", "pytest-cov (>=2.7)", "pytest (>=6)", "appdirs (==1.4.4)"]
-docs = ["sphinx-autodoc-typehints (>=1.12)", "proselint (>=0.10.2)", "furo (>=2021.7.5b38)", "Sphinx (>=4)"]
+docs = ["Sphinx (>=4)", "furo (>=2021.7.5b38)", "proselint (>=0.10.2)", "sphinx-autodoc-typehints (>=1.12)"]
+test = ["appdirs (==1.4.4)", "pytest (>=6)", "pytest-cov (>=2.7)", "pytest-mock (>=3.6)"]
 
 [[package]]
 name = "pluggy"
@@ -768,8 +768,8 @@ python-versions = ">=3.6"
 importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
 
 [package.extras]
-testing = ["pytest-benchmark", "pytest"]
-dev = ["tox", "pre-commit"]
+dev = ["pre-commit", "tox"]
+testing = ["pytest", "pytest-benchmark"]
 
 [[package]]
 name = "poetry"
@@ -961,7 +961,7 @@ pytest = ">=4.6"
 toml = "*"
 
 [package.extras]
-testing = ["fields", "hunter", "process-tests", "six", "pytest-xdist", "virtualenv"]
+testing = ["fields", "hunter", "process-tests", "pytest-xdist", "six", "virtualenv"]
 
 [[package]]
 name = "pywin32-ctypes"
@@ -1149,7 +1149,7 @@ virtualenv = ">=16.0.0,<20.0.0 || >20.0.0,<20.0.1 || >20.0.1,<20.0.2 || >20.0.2,
 
 [package.extras]
 docs = ["pygments-github-lexers (>=0.0.5)", "sphinx (>=2.0.0)", "sphinxcontrib-autoprogram (>=0.1.5)", "towncrier (>=18.5.0)"]
-testing = ["flaky (>=3.4.0)", "freezegun (>=0.3.11)", "pytest (>=4.0.0)", "pytest-cov (>=2.5.1)", "pytest-mock (>=1.10.0)", "pytest-randomly (>=1.0.0)", "psutil (>=5.6.1)", "pathlib2 (>=2.3.3)"]
+testing = ["flaky (>=3.4.0)", "freezegun (>=0.3.11)", "pathlib2 (>=2.3.3)", "psutil (>=5.6.1)", "pytest (>=4.0.0)", "pytest-cov (>=2.5.1)", "pytest-mock (>=1.10.0)", "pytest-randomly (>=1.0.0)"]
 
 [[package]]
 name = "traitlets"
@@ -1195,8 +1195,8 @@ optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, !=3.5.*, <4"
 
 [package.extras]
-brotli = ["brotlicffi (>=0.8.0)", "brotli (>=1.0.9)", "brotlipy (>=0.6.0)"]
-secure = ["pyOpenSSL (>=0.14)", "cryptography (>=1.3.4)", "idna (>=2.0.0)", "certifi", "urllib3-secure-extra", "ipaddress"]
+brotli = ["brotli (>=1.0.9)", "brotlicffi (>=0.8.0)", "brotlipy (>=0.6.0)"]
+secure = ["certifi", "cryptography (>=1.3.4)", "idna (>=2.0.0)", "ipaddress", "pyOpenSSL (>=0.14)", "urllib3-secure-extra"]
 socks = ["PySocks (>=1.5.6,!=1.5.7,<2.0)"]
 
 [[package]]
@@ -1251,8 +1251,8 @@ optional = false
 python-versions = ">=3.6"
 
 [package.extras]
-docs = ["sphinx", "jaraco.packaging (>=8.2)", "rst.linker (>=1.9)"]
-testing = ["pytest (>=4.6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytest-cov", "pytest-enabler (>=1.0.1)", "jaraco.itertools", "func-timeout", "pytest-black (>=0.3.7)", "pytest-mypy"]
+docs = ["jaraco.packaging (>=8.2)", "rst.linker (>=1.9)", "sphinx"]
+testing = ["func-timeout", "jaraco.itertools", "pytest (>=4.6)", "pytest-black (>=0.3.7)", "pytest-checkdocs (>=2.4)", "pytest-cov", "pytest-enabler (>=1.0.1)", "pytest-flake8", "pytest-mypy"]
 
 [extras]
 poetry = ["poetry"]
@@ -1260,7 +1260,7 @@ poetry = ["poetry"]
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.6.1"
-content-hash = "476e714a9836afb4b9358b43efa85012cebf21d4432a0306be071b1bfc601406"
+content-hash = "fc69ef5c85147a72c974c92aa9a8dcc5c7a31238647bc60a84f0d8aacadaa608"
 
 [metadata.files]
 appnope = [
@@ -1294,7 +1294,10 @@ black = [
     {file = "black-21.12b0-py3-none-any.whl", hash = "sha256:a615e69ae185e08fdd73e4715e260e2479c861b5740057fde6e8b4e3b7dd589f"},
     {file = "black-21.12b0.tar.gz", hash = "sha256:77b80f693a569e2e527958459634f18df9b0ba2625ba4e0c2d5da5be42e6f2b3"},
 ]
-blacken-docs = []
+blacken-docs = [
+    {file = "blacken_docs-1.12.1-py2.py3-none-any.whl", hash = "sha256:385eb3db60faddceb218e54e2677821e1dbd441d0473f95cc4b7206a52d5bb62"},
+    {file = "blacken_docs-1.12.1.tar.gz", hash = "sha256:5fd22ba1f3ab10d7013427019b4e7b83f6f4aca00c898645e0481ce7966b0aa4"},
+]
 cachecontrol = [
     {file = "CacheControl-0.12.11-py2.py3-none-any.whl", hash = "sha256:2c75d6a8938cb1933c75c50184549ad42728a27e9f6b92fd677c3151aa72555b"},
     {file = "CacheControl-0.12.11.tar.gz", hash = "sha256:a5b9fcc986b184db101aa280b42ecdcdfc524892596f606858e0b7a8b4d9e144"},
diff --git a/pyproject.toml b/pyproject.toml
index bf69778..4192ecf 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -45,8 +45,8 @@ tox = "^3.8.0"
 
 [tool.poetry.dev-dependencies]
 bandit = "^1.6.2"
-black = {version = "^21.12b0", allow-prereleases = true, python = "^3.7"}
-blacken-docs = "^1.8.0"
+black = { version = "^21.12b0", allow-prereleases = true, python = "^3.7" }
+blacken-docs = { version = "^1.8.0", python = "^3.7" }
 ipython = { version = "^7.18.1", python = "^3.7" }
 mdformat = "^0.6"
 mdformat-gfm = "^0.2"