diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0ab3d8d7e6c..35c1a034da6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,27 @@
 # Change Log
 
+## [1.1.0a2] - 2020-06-26
+
+Note that lock files generated with this release are not compatible with previous releases of Poetry.
+
+### Added
+
+- The `install` command now supports a `--remove-untracked` option to ensure only packages from the lock file are present in the environment ([#2172](https://github.com/python-poetry/poetry/pull/2172)).
+- Some errors will now be provided with possible solutions and links to the documentation ([#2396](https://github.com/python-poetry/poetry/pull/2396)).
+
+### Changed
+
+- Editable installations of Poetry projects have been improved and are now faster ([#2360](https://github.com/python-poetry/poetry/pull/2360)).
+- Improved the accuracy of the dependency resolver in case of dependencies with environment markers ([#2361](https://github.com/python-poetry/poetry/pull/2361))
+- Environment markers of dependencies are no longer stored in the lock file ([#2361](https://github.com/python-poetry/poetry/pull/2361)).
+- Improved the way connection errors are handled when publishing ([#2285](https://github.com/python-poetry/poetry/pull/2285)).
+
+### Fixed
+
+- Fixed errors when handling duplicate dependencies with environment markers ([#2342](https://github.com/python-poetry/poetry/pull/2342)).
+- Fixed the detection of installed packages ([#2360](https://github.com/python-poetry/poetry/pull/2360)).
+
+
 ## [1.1.0a1] - 2020-03-27
 
 This release **must** be downloaded via the `get-poetry.py` script and not via the `self update` command.
@@ -882,7 +904,8 @@ Initial release
 
 
 
-[Unreleased]: https://github.com/python-poetry/poetry/compare/1.1.0a1...develop
+[Unreleased]: https://github.com/python-poetry/poetry/compare/1.1.0a2...develop
+[1.1.0a2]: https://github.com/python-poetry/poetry/releases/tag/1.1.0a2
 [1.1.0a1]: https://github.com/python-poetry/poetry/releases/tag/1.1.0a1
 [1.0.9]: https://github.com/python-poetry/poetry/releases/tag/1.0.9
 [1.0.8]: https://github.com/python-poetry/poetry/releases/tag/1.0.8
diff --git a/Makefile b/Makefile
index ccb529f1f0a..1669c6a8b2a 100644
--- a/Makefile
+++ b/Makefile
@@ -55,6 +55,7 @@ linux_release:
 		-e PYTHON36=/opt/python/cp36-cp36m/bin/python \
 		-e PYTHON37=/opt/python/cp37-cp37m/bin/python \
 		-e PYTHON38=/opt/python/cp38-cp38/bin/python \
+		-e PYTHON39=/opt/python/cp39-cp39/bin/python \
 		quay.io/pypa/manylinux2010_x86_64 sh -c "cd /io && ./make-nix-release.sh"
 
 # run tests against all supported python versions
diff --git a/make-nix-release.sh b/make-nix-release.sh
index e5a368002bc..631bb65b5b3 100755
--- a/make-nix-release.sh
+++ b/make-nix-release.sh
@@ -3,13 +3,13 @@
 set -e
 
 test -n "$PYTHON" || PYTHON="python3"
-$PYTHON -m pip install pip -U
-$PYTHON -m pip install poetry -U --pre
-$PYTHON -m poetry config virtualenvs.create false
-$PYTHON -m poetry install --no-dev
-$PYTHON sonnet make release \
+$PYTHON get-poetry.py -y
+$PYTHON $HOME/.poetry/bin/poetry config virtualenvs.create false
+$PYTHON $HOME/.poetry/bin/poetry install --no-dev
+$PYTHON $HOME/.poetry/bin/poetry run python sonnet make release \
     ${PYTHON27:+-P "2.7:$PYTHON27"} \
     ${PYTHON35:+-P "3.5:$PYTHON35"} \
     ${PYTHON36:+-P "3.6:$PYTHON36"} \
     ${PYTHON37:+-P "3.7:$PYTHON37"} \
-    ${PYTHON38:+-P "3.8:$PYTHON38"}
+    ${PYTHON38:+-P "3.8:$PYTHON38"} \
+    ${PYTHON39:+-P "3.9:$PYTHON39"}
diff --git a/poetry.lock b/poetry.lock
index 3246c677e7d..6339c9b0a56 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -6,21 +6,10 @@ optional = false
 python-versions = "*"
 version = "1.4.4"
 
-[[package]]
-category = "dev"
-description = "A few extensions to pyyaml."
-name = "aspy.yaml"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "1.3.0"
-
-[package.dependencies]
-pyyaml = "*"
-
 [[package]]
 category = "dev"
 description = "Atomic file writes."
-marker = "python_version >= \"3.5\" and sys_platform == \"win32\" or python_version < \"3.5\""
+marker = "python_version >= \"3.5\" and sys_platform == \"win32\" or sys_platform == \"win32\" or python_version < \"3.5\""
 name = "atomicwrites"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
@@ -29,7 +18,6 @@ version = "1.4.0"
 [[package]]
 category = "dev"
 description = "Classes Without Boilerplate"
-marker = "python_version < \"3.5\" or python_version >= \"3.5\" or python_version >= \"3.6\" and python_version < \"4.0\""
 name = "attrs"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
@@ -114,7 +102,7 @@ description = "Python package for providing Mozilla's CA Bundle."
 name = "certifi"
 optional = false
 python-versions = "*"
-version = "2020.4.5.1"
+version = "2020.6.20"
 
 [[package]]
 category = "main"
@@ -131,17 +119,7 @@ pycparser = "*"
 [[package]]
 category = "dev"
 description = "Validate configuration and produce human readable error messages."
-name = "cfgv"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "2.0.1"
-
-[package.dependencies]
-six = "*"
-
-[[package]]
-category = "dev"
-description = "Validate configuration and produce human readable error messages."
+marker = "python_version >= \"3.6.1\" and python_version < \"4.0.0\""
 name = "cfgv"
 optional = false
 python-versions = ">=3.6"
@@ -206,7 +184,7 @@ version = ">=3.6,<4.0"
 [[package]]
 category = "dev"
 description = "Cross-platform colored terminal text."
-marker = "sys_platform == \"win32\" and python_version != \"3.4\" and python_version < \"3.5\" or platform_system == \"Windows\" or python_version >= \"3.5\" and sys_platform == \"win32\""
+marker = "sys_platform == \"win32\" and python_version != \"3.4\" and python_version < \"3.5\" or platform_system == \"Windows\" or python_version >= \"3.5\" and sys_platform == \"win32\" or sys_platform == \"win32\""
 name = "colorama"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
@@ -215,7 +193,7 @@ version = "0.4.3"
 [[package]]
 category = "main"
 description = "Updated configparser from Python 3.7 for Python 2.6+."
-marker = "python_version < \"3\" or python_version >= \"2.7\" and python_version < \"2.8\""
+marker = "python_version >= \"2.7\" and python_version < \"2.8\" or python_version == \"2.7\" and python_version == \"2.7\" or python_version < \"3\""
 name = "configparser"
 optional = false
 python-versions = ">=2.6"
@@ -228,7 +206,7 @@ testing = ["pytest (>=3.5,<3.7.3 || >3.7.3)", "pytest-checkdocs (>=1.2)", "pytes
 [[package]]
 category = "main"
 description = "Backports and enhancements for the contextlib module"
-marker = "python_version < \"3.4\" or python_version >= \"2.7\" and python_version < \"2.8\""
+marker = "python_version >= \"2.7\" and python_version < \"2.8\" or python_version < \"3.4\""
 name = "contextlib2"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
@@ -290,6 +268,9 @@ optional = false
 python-versions = "*"
 version = "0.3.0"
 
+[package.dependencies]
+nut = "*"
+
 [[package]]
 category = "main"
 description = "Discover and load entry points from installed packages."
@@ -348,15 +329,6 @@ optional = false
 python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
 version = "0.18.2"
 
-[[package]]
-category = "dev"
-description = "Backport of the concurrent.futures package from Python 3"
-marker = "python_version < \"3.2\""
-name = "futures"
-optional = false
-python-versions = ">=2.6, <3"
-version = "3.3.0"
-
 [[package]]
 category = "main"
 description = "Version of the glob module that can capture patterns and supports recursive wildcards"
@@ -371,17 +343,16 @@ category = "main"
 description = "HTML parser based on the WHATWG HTML specification"
 name = "html5lib"
 optional = false
-python-versions = "*"
-version = "1.0.1"
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+version = "1.1"
 
 [package.dependencies]
 six = ">=1.9"
 webencodings = "*"
 
 [package.extras]
-all = ["genshi", "chardet (>=2.2)", "datrie", "lxml"]
+all = ["genshi", "chardet (>=2.2)", "lxml"]
 chardet = ["chardet (>=2.2)"]
-datrie = ["datrie"]
 genshi = ["genshi"]
 lxml = ["lxml"]
 
@@ -399,10 +370,11 @@ six = "*"
 [[package]]
 category = "dev"
 description = "File identification library for Python"
+marker = "python_version >= \"3.6.1\" and python_version < \"4.0.0\""
 name = "identify"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,>=2.7"
-version = "1.4.19"
+version = "1.4.20"
 
 [package.extras]
 license = ["editdistance"]
@@ -422,7 +394,7 @@ marker = "python_version >= \"2.7\" and python_version < \"2.8\" or python_versi
 name = "importlib-metadata"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
-version = "1.6.0"
+version = "1.6.1"
 
 [package.dependencies]
 zipp = ">=0.5"
@@ -441,16 +413,16 @@ version = "*"
 
 [package.extras]
 docs = ["sphinx", "rst.linker"]
-testing = ["packaging", "importlib-resources"]
+testing = ["packaging", "pep517", "importlib-resources (>=1.3)"]
 
 [[package]]
 category = "main"
 description = "Read resources from Python packages"
-marker = "python_version < \"3.7\" or python_version >= \"2.7\" and python_version < \"2.8\""
+marker = "python_version >= \"2.7\" and python_version < \"2.8\" or python_version < \"3.7\" or python_version >= \"3.6.1\" and python_version < \"3.7\""
 name = "importlib-resources"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
-version = "1.5.0"
+version = "2.0.1"
 
 [package.dependencies]
 [package.dependencies.contextlib2]
@@ -605,11 +577,14 @@ marker = "python_version >= \"2.7.9\" and python_version < \"2.8.0\" or python_v
 name = "livereload"
 optional = false
 python-versions = "*"
-version = "2.6.1"
+version = "2.6.2"
 
 [package.dependencies]
 six = "*"
-tornado = "*"
+
+[package.dependencies.tornado]
+python = ">=2.8"
+version = "*"
 
 [[package]]
 category = "main"
@@ -764,11 +739,10 @@ six = ">=1.0.0,<2.0.0"
 [[package]]
 category = "dev"
 description = "More routines for operating on iterables, beyond itertools"
-marker = "python_version >= \"3.5\""
 name = "more-itertools"
 optional = false
 python-versions = ">=3.5"
-version = "8.3.0"
+version = "8.4.0"
 
 [[package]]
 category = "main"
@@ -804,11 +778,20 @@ twitter = ["twython"]
 [[package]]
 category = "dev"
 description = "Node.js virtual environment builder"
+marker = "python_version >= \"3.6.1\" and python_version < \"4.0.0\""
 name = "nodeenv"
 optional = false
 python-versions = "*"
 version = "1.4.0"
 
+[[package]]
+category = "main"
+description = "Network utility... things like a UDP/TCP relay."
+name = "nut"
+optional = false
+python-versions = "*"
+version = "0.2.0"
+
 [[package]]
 category = "dev"
 description = "Core utilities for Python packages"
@@ -906,7 +889,7 @@ description = "Core utilities for Poetry"
 name = "poetry-core"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
-version = "1.0.0a7"
+version = "1.0.0a8"
 
 [package.dependencies]
 [package.dependencies.enum34]
@@ -928,24 +911,19 @@ version = ">=3.7.4.1,<4.0.0.0"
 [[package]]
 category = "dev"
 description = "A framework for managing and maintaining multi-language pre-commit hooks."
+marker = "python_version >= \"3.6.1\" and python_version < \"4.0.0\""
 name = "pre-commit"
 optional = false
-python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
-version = "1.21.0"
+python-versions = ">=3.6.1"
+version = "2.5.1"
 
 [package.dependencies]
-"aspy.yaml" = "*"
 cfgv = ">=2.0.0"
 identify = ">=1.0.0"
 nodeenv = ">=0.11.1"
-pyyaml = "*"
-six = "*"
+pyyaml = ">=5.1"
 toml = "*"
-virtualenv = ">=15.2"
-
-[package.dependencies.futures]
-python = "<3.2"
-version = "*"
+virtualenv = ">=20.0.8"
 
 [package.dependencies.importlib-metadata]
 python = "<3.8"
@@ -969,7 +947,7 @@ description = "library with cross-python path, ini-parsing, io, code, log facili
 name = "py"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "1.8.1"
+version = "1.9.0"
 
 [[package]]
 category = "main"
@@ -1122,11 +1100,11 @@ description = "Pytest plugin for measuring coverage."
 name = "pytest-cov"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
-version = "2.9.0"
+version = "2.10.0"
 
 [package.dependencies]
 coverage = ">=4.4"
-pytest = ">=3.6"
+pytest = ">=4.6"
 
 [package.extras]
 testing = ["fields", "hunter", "process-tests (2.0.2)", "six", "pytest-xdist", "virtualenv"]
@@ -1174,6 +1152,7 @@ version = "0.2.0"
 [[package]]
 category = "dev"
 description = "YAML parser and emitter for Python"
+marker = "python_version >= \"2.7.9\" and python_version < \"2.8.0\" or python_version >= \"3.4\" and python_version < \"4.0\" or python_version >= \"3.6.1\" and python_version < \"4.0.0\""
 name = "pyyaml"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
@@ -1186,7 +1165,7 @@ marker = "python_version >= \"2.7.9\" and python_version < \"2.8.0\" or python_v
 name = "regex"
 optional = false
 python-versions = "*"
-version = "2020.5.14"
+version = "2020.6.8"
 
 [[package]]
 category = "main"
@@ -1194,7 +1173,7 @@ description = "Python HTTP for Humans."
 name = "requests"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
-version = "2.23.0"
+version = "2.24.0"
 
 [package.dependencies]
 certifi = ">=2017.4.17"
@@ -1331,28 +1310,19 @@ version = ">=3.6,<4.0"
 [[package]]
 category = "dev"
 description = "Tornado is a Python web framework and asynchronous networking library, originally developed at FriendFeed."
-marker = "python_version >= \"2.7.9\" and python_version < \"2.8.0\" and python_full_version >= \"2.7.9\" and python_full_version < \"2.8.0\" or python_version >= \"3.4\" and python_version < \"4.0\" and python_full_version >= \"2.7.9\" and python_full_version < \"2.8.0\" or python_version >= \"3.4\" and python_version < \"4.0\""
+marker = "python_version >= \"2.7.9\" and python_version < \"2.8.0\" or python_version >= \"3.4\" and python_version < \"4.0\""
 name = "tornado"
 optional = false
 python-versions = ">= 2.7, !=3.0.*, !=3.1.*, !=3.2.*, != 3.3.*"
 version = "5.1.1"
 
-[[package]]
-category = "dev"
-description = "Tornado is a Python web framework and asynchronous networking library, originally developed at FriendFeed."
-marker = "python_version >= \"2.7.9\" and python_version < \"2.8.0\" and python_full_version >= \"2.7.9\" and python_full_version < \"2.8.0\" or python_version >= \"2.7.9\" and python_version < \"2.8.0\" or python_version >= \"3.4\" and python_version < \"4.0\" and python_full_version >= \"2.7.9\" and python_full_version < \"2.8.0\" or python_version >= \"3.4\" and python_version < \"4.0\""
-name = "tornado"
-optional = false
-python-versions = ">= 3.5"
-version = "6.0.4"
-
 [[package]]
 category = "dev"
 description = "tox is a generic virtualenv management and test command line tool"
 name = "tox"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
-version = "3.15.1"
+version = "3.15.2"
 
 [package.dependencies]
 colorama = ">=0.4.1"
@@ -1396,7 +1366,7 @@ version = "1.4.1"
 [[package]]
 category = "main"
 description = "Type Hints for Python"
-marker = "python_version >= \"2.7\" and python_version < \"2.8\" or python_version >= \"3.4\" and python_version < \"3.5\""
+marker = "python_version >= \"2.7\" and python_version < \"2.8\" or python_version >= \"3.4\" and python_version < \"3.5\" or python_version >= \"2.7\" and python_version < \"2.8\" and (python_version >= \"2.7\" and python_version < \"2.8\" or python_version < \"3.5\") or python_version < \"3.5\""
 name = "typing"
 optional = false
 python-versions = "*"
@@ -1430,7 +1400,7 @@ description = "Virtual Python Environment builder"
 name = "virtualenv"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,>=2.7"
-version = "20.0.21"
+version = "20.0.25"
 
 [package.dependencies]
 appdirs = ">=1.4.3,<2"
@@ -1438,17 +1408,13 @@ distlib = ">=0.3.0,<1"
 filelock = ">=3.0.0,<4"
 six = ">=1.9.0,<2"
 
-[package.dependencies.contextlib2]
-python = "<3.3"
-version = ">=0.6.0,<1"
-
 [package.dependencies.importlib-metadata]
 python = "<3.8"
 version = ">=0.12,<2"
 
 [package.dependencies.importlib-resources]
 python = "<3.7"
-version = ">=1.0,<2"
+version = ">=1.0"
 
 [package.dependencies.pathlib2]
 python = "<3.4"
@@ -1456,16 +1422,15 @@ version = ">=2.3.3,<3"
 
 [package.extras]
 docs = ["sphinx (>=3)", "sphinx-argparse (>=0.2.5)", "sphinx-rtd-theme (>=0.4.3)", "towncrier (>=19.9.0rc1)", "proselint (>=0.10.2)"]
-testing = ["pytest (>=4)", "coverage (>=5)", "coverage-enable-subprocess (>=1)", "pytest-xdist (>=1.31.0)", "pytest-mock (>=2)", "pytest-env (>=0.6.2)", "pytest-randomly (>=1)", "pytest-timeout", "packaging (>=20.0)", "xonsh (>=0.9.16)"]
+testing = ["pytest (>=4)", "coverage (>=5)", "coverage-enable-subprocess (>=1)", "pytest-xdist (>=1.31.0)", "pytest-mock (>=2)", "pytest-env (>=0.6.2)", "pytest-randomly (>=1)", "pytest-timeout (>=1)", "pytest-freezegun (>=0.4.1)", "flaky (>=3)", "packaging (>=20.0)", "xonsh (>=0.9.16)"]
 
 [[package]]
 category = "dev"
 description = "Measures the displayed width of unicode strings in a terminal"
-marker = "python_version < \"3.5\" or python_version >= \"3.5\""
 name = "wcwidth"
 optional = false
 python-versions = "*"
-version = "0.2.3"
+version = "0.2.5"
 
 [package.dependencies]
 [package.dependencies."backports.functools-lru-cache"]
@@ -1512,7 +1477,7 @@ docs = ["sphinx", "jaraco.packaging (>=3.2)", "rst.linker (>=1.9)"]
 testing = ["jaraco.itertools", "func-timeout"]
 
 [metadata]
-content-hash = "90cb5177483057d7bf7dea367cb6ccf0968861777c801f3bb41b0f745cccdc24"
+content-hash = "78c1880171165781164556d08eb2cdd58ed2c708b73dfa6a92acd2dd1df3739c"
 python-versions = "~2.7 || ^3.5"
 
 [metadata.files]
@@ -1520,10 +1485,6 @@ appdirs = [
     {file = "appdirs-1.4.4-py2.py3-none-any.whl", hash = "sha256:a841dacd6b99318a741b166adb07e19ee71a274450e68237b4650ca1055ab128"},
     {file = "appdirs-1.4.4.tar.gz", hash = "sha256:7d5d0167b2b1ba821647616af46a749d1c653740dd0d2415100fe26e27afdf41"},
 ]
-"aspy.yaml" = [
-    {file = "aspy.yaml-1.3.0-py2.py3-none-any.whl", hash = "sha256:463372c043f70160a9ec950c3f1e4c3a82db5fca01d334b6bc89c7164d744bdc"},
-    {file = "aspy.yaml-1.3.0.tar.gz", hash = "sha256:e7c742382eff2caed61f87a39d13f99109088e5e93f04d76eb8d4b28aa143f45"},
-]
 atomicwrites = [
     {file = "atomicwrites-1.4.0-py2.py3-none-any.whl", hash = "sha256:6d1784dea7c0c8d4a5172b6c620f40b6e4cbfdf96d783691f2e1302a7b88e197"},
     {file = "atomicwrites-1.4.0.tar.gz", hash = "sha256:ae70396ad1a434f9c7046fd2dd196fc04b12f9e91ffb859164193be8b6168a7a"},
@@ -1549,8 +1510,8 @@ cachy = [
     {file = "cachy-0.3.0.tar.gz", hash = "sha256:186581f4ceb42a0bbe040c407da73c14092379b1e4c0e327fdb72ae4a9b269b1"},
 ]
 certifi = [
-    {file = "certifi-2020.4.5.1-py2.py3-none-any.whl", hash = "sha256:1d987a998c75633c40847cc966fcf5904906c920a7f17ef374f5aa4282abd304"},
-    {file = "certifi-2020.4.5.1.tar.gz", hash = "sha256:51fcb31174be6e6664c5f69e3e1691a2d72a1a12e90f872cbdb1567eb47b6519"},
+    {file = "certifi-2020.6.20-py2.py3-none-any.whl", hash = "sha256:8fc0819f1f30ba15bdb34cceffb9ef04d99f420f68eb75d901e9560b8749fc41"},
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 ]
 requests = [
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-    {file = "requests-2.23.0.tar.gz", hash = "sha256:b3f43d496c6daba4493e7c431722aeb7dbc6288f52a6e04e7b6023b0247817e6"},
+    {file = "requests-2.24.0-py2.py3-none-any.whl", hash = "sha256:fe75cc94a9443b9246fc7049224f75604b113c36acb93f87b80ed42c44cbb898"},
+    {file = "requests-2.24.0.tar.gz", hash = "sha256:b3559a131db72c33ee969480840fff4bb6dd111de7dd27c8ee1f820f4f00231b"},
 ]
 requests-toolbelt = [
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@@ -2024,6 +1986,7 @@ six = [
 ]
 subprocess32 = [
     {file = "subprocess32-3.5.4-cp27-cp27m-macosx_10_6_intel.whl", hash = "sha256:88e37c1aac5388df41cc8a8456bb49ebffd321a3ad4d70358e3518176de3a56b"},
+    {file = "subprocess32-3.5.4-cp27-cp27mu-manylinux2014_x86_64.whl", hash = "sha256:e45d985aef903c5b7444d34350b05da91a9e0ea015415ab45a21212786c649d0"},
     {file = "subprocess32-3.5.4.tar.gz", hash = "sha256:eb2937c80497978d181efa1b839ec2d9622cf9600a039a79d0e108d1f9aec79d"},
 ]
 termcolor = [
@@ -2045,19 +2008,10 @@ tornado = [
     {file = "tornado-5.1.1-cp37-cp37m-win32.whl", hash = "sha256:e5f2585afccbff22390cddac29849df463b252b711aa2ce7c5f3f342a5b3b444"},
     {file = "tornado-5.1.1-cp37-cp37m-win_amd64.whl", hash = "sha256:8e9d728c4579682e837c92fdd98036bd5cdefa1da2aaf6acf26947e6dd0c01c5"},
     {file = "tornado-5.1.1.tar.gz", hash = "sha256:4e5158d97583502a7e2739951553cbd88a72076f152b4b11b64b9a10c4c49409"},
-    {file = "tornado-6.0.4-cp35-cp35m-win32.whl", hash = "sha256:5217e601700f24e966ddab689f90b7ea4bd91ff3357c3600fa1045e26d68e55d"},
-    {file = "tornado-6.0.4-cp35-cp35m-win_amd64.whl", hash = "sha256:c98232a3ac391f5faea6821b53db8db461157baa788f5d6222a193e9456e1740"},
-    {file = "tornado-6.0.4-cp36-cp36m-win32.whl", hash = "sha256:5f6a07e62e799be5d2330e68d808c8ac41d4a259b9cea61da4101b83cb5dc673"},
-    {file = "tornado-6.0.4-cp36-cp36m-win_amd64.whl", hash = "sha256:c952975c8ba74f546ae6de2e226ab3cc3cc11ae47baf607459a6728585bb542a"},
-    {file = "tornado-6.0.4-cp37-cp37m-win32.whl", hash = "sha256:2c027eb2a393d964b22b5c154d1a23a5f8727db6fda837118a776b29e2b8ebc6"},
-    {file = "tornado-6.0.4-cp37-cp37m-win_amd64.whl", hash = "sha256:5618f72e947533832cbc3dec54e1dffc1747a5cb17d1fd91577ed14fa0dc081b"},
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-    {file = "tornado-6.0.4.tar.gz", hash = "sha256:0fe2d45ba43b00a41cd73f8be321a44936dc1aba233dee979f17a042b83eb6dc"},
 ]
 tox = [
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-    {file = "tox-3.15.1.tar.gz", hash = "sha256:8c9ad9b48659d291c5bc78bcabaa4d680d627687154b812fa52baedaa94f9f83"},
+    {file = "tox-3.15.2-py2.py3-none-any.whl", hash = "sha256:50a188b8e17580c1fb931f494a754e6507d4185f54fb18aca5ba3e12d2ffd55e"},
+    {file = "tox-3.15.2.tar.gz", hash = "sha256:c696d36cd7c6a28ada2da780400e44851b20ee19ef08cfe73344a1dcebbbe9f3"},
 ]
 tqdm = [
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@@ -2101,12 +2055,12 @@ urllib3 = [
     {file = "urllib3-1.25.9.tar.gz", hash = "sha256:3018294ebefce6572a474f0604c2021e33b3fd8006ecd11d62107a5d2a963527"},
 ]
 virtualenv = [
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-    {file = "virtualenv-20.0.21.tar.gz", hash = "sha256:a116629d4e7f4d03433b8afa27f43deba09d48bc48f5ecefa4f015a178efb6cf"},
+    {file = "virtualenv-20.0.25-py2.py3-none-any.whl", hash = "sha256:ffffcb3c78a671bb3d590ac3bc67c081ea2188befeeb058870cba13e7f82911b"},
+    {file = "virtualenv-20.0.25.tar.gz", hash = "sha256:f332ba0b2dfbac9f6b1da9f11224f0036b05cdb4df23b228527c2a2d5504aeed"},
 ]
 wcwidth = [
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-    {file = "wcwidth-0.2.3.tar.gz", hash = "sha256:edbc2b718b4db6cdf393eefe3a420183947d6aa312505ce6754516f458ff8830"},
+    {file = "wcwidth-0.2.5-py2.py3-none-any.whl", hash = "sha256:beb4802a9cebb9144e99086eff703a642a13d6a0052920003a230f3294bbe784"},
+    {file = "wcwidth-0.2.5.tar.gz", hash = "sha256:c4d647b99872929fdb7bdcaa4fbe7f01413ed3d98077df798530e5b04f116c83"},
 ]
 webencodings = [
     {file = "webencodings-0.5.1-py2.py3-none-any.whl", hash = "sha256:a0af1213f3c2226497a97e2b3aa01a7e4bee4f403f95be16fc9acd2947514a78"},
diff --git a/poetry/__version__.py b/poetry/__version__.py
index b8d9ea00cbe..5903a87689d 100644
--- a/poetry/__version__.py
+++ b/poetry/__version__.py
@@ -1 +1 @@
-__version__ = "1.1.0a1"
+__version__ = "1.1.0a2"
diff --git a/pyproject.toml b/pyproject.toml
index f848ce10ac3..9073ff58266 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "poetry"
-version = "1.1.0a1"
+version = "1.1.0a2"
 description = "Python dependency management and packaging made easy."
 authors = [
     "Sébastien Eustace <sebastien@eustace.io>"
@@ -24,7 +24,7 @@ classifiers = [
 [tool.poetry.dependencies]
 python = "~2.7 || ^3.5"
 
-poetry-core = "^1.0.0a6"
+poetry-core = "^1.0.0a8"
 cleo = "^0.8.1"
 clikit = "^0.6.2"
 crashtest = { version = "^0.3.0", python = "^3.6" }
@@ -70,7 +70,7 @@ pygments = "^2.2"
 pytest-mock = "^1.9"
 pygments-github-lexers = "^0.0.5"
 black = { version = "^19.10b0", python = "^3.6" }
-pre-commit = "^1.10"
+pre-commit = { version = "^2.5.1", python = "^3.6.1" }
 tox = "^3.0"
 pytest-sugar = "^0.9.2"
 httpretty = "^0.9.6"