diff --git a/CHANGELOG.md b/CHANGELOG.md
index 16e5d1616bd..d6425e31209 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,15 @@
 # Change Log
 
+## [1.1.9] - 2021-09-18
+
+### Fixed
+
+- Fixed a security issue where file hashes were not checked prior to installation. ([#4420](https://github.com/python-poetry/poetry/pull/4420), [#4444](https://github.com/python-poetry/poetry/pull/4444), [python-poetry/poetry-core#193](https://github.com/python-poetry/poetry-core/pull/193))
+- Fixed the detection of the system environment when the setting `virtualenvs.create` is deactivated. ([#4507](https://github.com/python-poetry/poetry/pull/4507))
+- Fixed an issue where unsafe parameters could be passed to `git` commands. ([python-poetry/poetry-core#203](https://github.com/python-poetry/poetry-core/pull/203))
+- Fixed an issue where the wrong `git` executable could be used on Windows. ([python-poetry/poetry-core#205](https://github.com/python-poetry/poetry-core/pull/205))
+
+
 ## [1.1.8] - 2021-08-19
 
 ### Fixed
@@ -1134,7 +1144,8 @@ Initial release
 
 
 
-[Unreleased]: https://github.com/python-poetry/poetry/compare/1.1.8...1.1
+[Unreleased]: https://github.com/python-poetry/poetry/compare/1.1.9...1.1
+[1.1.9]: https://github.com/python-poetry/poetry/releases/tag/1.1.9
 [1.1.8]: https://github.com/python-poetry/poetry/releases/tag/1.1.8
 [1.1.7]: https://github.com/python-poetry/poetry/releases/tag/1.1.7
 [1.1.6]: https://github.com/python-poetry/poetry/releases/tag/1.1.6
diff --git a/poetry.lock b/poetry.lock
index c6073348e84..cf6819628b1 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -98,7 +98,7 @@ pycparser = "*"
 
 [[package]]
 name = "cfgv"
-version = "3.3.0"
+version = "3.3.1"
 description = "Validate configuration and produce human readable error messages."
 category = "dev"
 optional = false
@@ -228,7 +228,7 @@ test = ["pytest (>=3.6.0,!=3.9.0,!=3.9.1,!=3.9.2)", "pretend", "iso8601", "pytz"
 
 [[package]]
 name = "cryptography"
-version = "3.4.7"
+version = "3.4.8"
 description = "cryptography is a package which provides cryptographic recipes and primitives to Python developers."
 category = "main"
 optional = false
@@ -343,7 +343,7 @@ six = "*"
 
 [[package]]
 name = "identify"
-version = "2.2.13"
+version = "2.2.14"
 description = "File identification library for Python"
 category = "dev"
 optional = false
@@ -525,7 +525,7 @@ python-versions = ">=3.4"
 
 [[package]]
 name = "more-itertools"
-version = "8.8.0"
+version = "8.10.0"
 description = "More routines for operating on iterables, beyond itertools"
 category = "dev"
 optional = false
@@ -624,7 +624,7 @@ dev = ["pre-commit", "tox"]
 
 [[package]]
 name = "poetry-core"
-version = "1.0.4"
+version = "1.0.5"
 description = "Poetry PEP 517 Build Backend"
 category = "main"
 optional = false
@@ -639,7 +639,7 @@ typing = {version = ">=3.7.4.1,<4.0.0.0", markers = "python_version >= \"2.7\" a
 
 [[package]]
 name = "pre-commit"
-version = "2.14.0"
+version = "2.15.0"
 description = "A framework for managing and maintaining multi-language pre-commit hooks."
 category = "dev"
 optional = false
@@ -952,7 +952,7 @@ typing = {version = ">=3.6,<4.0", markers = "python_version >= \"2.7\" and pytho
 
 [[package]]
 name = "tox"
-version = "3.24.2"
+version = "3.24.4"
 description = "tox is a generic virtualenv management and test command line tool"
 category = "dev"
 optional = false
@@ -983,7 +983,7 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, <3.5"
 
 [[package]]
 name = "typing-extensions"
-version = "3.10.0.0"
+version = "3.10.0.2"
 description = "Backported and Experimental Type Hints for Python 3.5+"
 category = "main"
 optional = false
@@ -1004,7 +1004,7 @@ socks = ["PySocks (>=1.5.6,!=1.5.7,<2.0)"]
 
 [[package]]
 name = "virtualenv"
-version = "20.7.2"
+version = "20.8.0"
 description = "Virtual Python Environment builder"
 category = "main"
 optional = false
@@ -1061,7 +1061,7 @@ testing = ["pathlib2", "unittest2", "jaraco.itertools", "func-timeout"]
 [metadata]
 lock-version = "1.1"
 python-versions = "~2.7 || ^3.5"
-content-hash = "e45e80a8cc2d64595c7f7e7a494dc8e80a7c1cd9f87cfd89539330e74823c06a"
+content-hash = "24a401f74f301836bdb4c066edcb766d1c0702a96151add3145e7b389928a94f"
 
 [metadata.files]
 atomicwrites = [
@@ -1140,8 +1140,8 @@ cffi = [
     {file = "cffi-1.14.6.tar.gz", hash = "sha256:c9a875ce9d7fe32887784274dd533c57909b7b1dcadcc128a2ac21331a9765dd"},
 ]
 cfgv = [
-    {file = "cfgv-3.3.0-py2.py3-none-any.whl", hash = "sha256:b449c9c6118fe8cca7fa5e00b9ec60ba08145d281d52164230a69211c5d597a1"},
-    {file = "cfgv-3.3.0.tar.gz", hash = "sha256:9e600479b3b99e8af981ecdfc80a0296104ee610cab48a5ae4ffd0b668650eb1"},
+    {file = "cfgv-3.3.1-py2.py3-none-any.whl", hash = "sha256:c6a0883f3917a037485059700b9e75da2464e6c27051014ad85ba6aaa5884426"},
+    {file = "cfgv-3.3.1.tar.gz", hash = "sha256:f5a830efb9ce7a445376bb66ec94c638a9787422f96264c98edc6bdeed8ab736"},
 ]
 chardet = [
     {file = "chardet-4.0.0-py2.py3-none-any.whl", hash = "sha256:f864054d66fd9118f2e67044ac8981a54775ec5b67aed0441892edb553d21da5"},
@@ -1262,18 +1262,23 @@ cryptography = [
     {file = "cryptography-3.3.2-cp36-abi3-win32.whl", hash = "sha256:3c284fc1e504e88e51c428db9c9274f2da9f73fdf5d7e13a36b8ecb039af6e6c"},
     {file = "cryptography-3.3.2-cp36-abi3-win_amd64.whl", hash = "sha256:7951a966613c4211b6612b0352f5bf29989955ee592c4a885d8c7d0f830d0433"},
     {file = "cryptography-3.3.2.tar.gz", hash = "sha256:5a60d3780149e13b7a6ff7ad6526b38846354d11a15e21068e57073e29e19bed"},
-    {file = "cryptography-3.4.7-cp36-abi3-macosx_10_10_x86_64.whl", hash = "sha256:3d8427734c781ea5f1b41d6589c293089704d4759e34597dce91014ac125aad1"},
-    {file = "cryptography-3.4.7-cp36-abi3-macosx_11_0_arm64.whl", hash = "sha256:8e56e16617872b0957d1c9742a3f94b43533447fd78321514abbe7db216aa250"},
-    {file = "cryptography-3.4.7-cp36-abi3-manylinux2010_x86_64.whl", hash = "sha256:37340614f8a5d2fb9aeea67fd159bfe4f5f4ed535b1090ce8ec428b2f15a11f2"},
-    {file = "cryptography-3.4.7-cp36-abi3-manylinux2014_aarch64.whl", hash = "sha256:240f5c21aef0b73f40bb9f78d2caff73186700bf1bc6b94285699aff98cc16c6"},
-    {file = "cryptography-3.4.7-cp36-abi3-manylinux2014_x86_64.whl", hash = "sha256:1e056c28420c072c5e3cb36e2b23ee55e260cb04eee08f702e0edfec3fb51959"},
-    {file = "cryptography-3.4.7-cp36-abi3-win32.whl", hash = "sha256:0f1212a66329c80d68aeeb39b8a16d54ef57071bf22ff4e521657b27372e327d"},
-    {file = "cryptography-3.4.7-cp36-abi3-win_amd64.whl", hash = "sha256:de4e5f7f68220d92b7637fc99847475b59154b7a1b3868fb7385337af54ac9ca"},
-    {file = "cryptography-3.4.7-pp36-pypy36_pp73-manylinux2010_x86_64.whl", hash = "sha256:26965837447f9c82f1855e0bc8bc4fb910240b6e0d16a664bb722df3b5b06873"},
-    {file = "cryptography-3.4.7-pp36-pypy36_pp73-manylinux2014_x86_64.whl", hash = "sha256:eb8cc2afe8b05acbd84a43905832ec78e7b3873fb124ca190f574dca7389a87d"},
-    {file = "cryptography-3.4.7-pp37-pypy37_pp73-manylinux2010_x86_64.whl", hash = "sha256:7ec5d3b029f5fa2b179325908b9cd93db28ab7b85bb6c1db56b10e0b54235177"},
-    {file = "cryptography-3.4.7-pp37-pypy37_pp73-manylinux2014_x86_64.whl", hash = "sha256:ee77aa129f481be46f8d92a1a7db57269a2f23052d5f2433b4621bb457081cc9"},
-    {file = "cryptography-3.4.7.tar.gz", hash = "sha256:3d10de8116d25649631977cb37da6cbdd2d6fa0e0281d014a5b7d337255ca713"},
+    {file = "cryptography-3.4.8-cp36-abi3-macosx_10_10_x86_64.whl", hash = "sha256:a00cf305f07b26c351d8d4e1af84ad7501eca8a342dedf24a7acb0e7b7406e14"},
+    {file = "cryptography-3.4.8-cp36-abi3-macosx_11_0_arm64.whl", hash = "sha256:f44d141b8c4ea5eb4dbc9b3ad992d45580c1d22bf5e24363f2fbf50c2d7ae8a7"},
+    {file = "cryptography-3.4.8-cp36-abi3-manylinux_2_12_x86_64.manylinux2010_x86_64.whl", hash = "sha256:0a7dcbcd3f1913f664aca35d47c1331fce738d44ec34b7be8b9d332151b0b01e"},
+    {file = "cryptography-3.4.8-cp36-abi3-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:34dae04a0dce5730d8eb7894eab617d8a70d0c97da76b905de9efb7128ad7085"},
+    {file = "cryptography-3.4.8-cp36-abi3-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:1eb7bb0df6f6f583dd8e054689def236255161ebbcf62b226454ab9ec663746b"},
+    {file = "cryptography-3.4.8-cp36-abi3-manylinux_2_24_x86_64.whl", hash = "sha256:9965c46c674ba8cc572bc09a03f4c649292ee73e1b683adb1ce81e82e9a6a0fb"},
+    {file = "cryptography-3.4.8-cp36-abi3-win32.whl", hash = "sha256:21ca464b3a4b8d8e86ba0ee5045e103a1fcfac3b39319727bc0fc58c09c6aff7"},
+    {file = "cryptography-3.4.8-cp36-abi3-win_amd64.whl", hash = "sha256:3520667fda779eb788ea00080124875be18f2d8f0848ec00733c0ec3bb8219fc"},
+    {file = "cryptography-3.4.8-pp36-pypy36_pp73-manylinux_2_12_x86_64.manylinux2010_x86_64.whl", hash = "sha256:d2a6e5ef66503da51d2110edf6c403dc6b494cc0082f85db12f54e9c5d4c3ec5"},
+    {file = "cryptography-3.4.8-pp36-pypy36_pp73-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:a305600e7a6b7b855cd798e00278161b681ad6e9b7eca94c721d5f588ab212af"},
+    {file = "cryptography-3.4.8-pp36-pypy36_pp73-manylinux_2_24_x86_64.whl", hash = "sha256:3fa3a7ccf96e826affdf1a0a9432be74dc73423125c8f96a909e3835a5ef194a"},
+    {file = "cryptography-3.4.8-pp37-pypy37_pp73-macosx_10_10_x86_64.whl", hash = "sha256:d9ec0e67a14f9d1d48dd87a2531009a9b251c02ea42851c060b25c782516ff06"},
+    {file = "cryptography-3.4.8-pp37-pypy37_pp73-manylinux_2_12_x86_64.manylinux2010_x86_64.whl", hash = "sha256:5b0fbfae7ff7febdb74b574055c7466da334a5371f253732d7e2e7525d570498"},
+    {file = "cryptography-3.4.8-pp37-pypy37_pp73-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:94fff993ee9bc1b2440d3b7243d488c6a3d9724cc2b09cdb297f6a886d040ef7"},
+    {file = "cryptography-3.4.8-pp37-pypy37_pp73-manylinux_2_24_x86_64.whl", hash = "sha256:8695456444f277af73a4877db9fc979849cd3ee74c198d04fc0776ebc3db52b9"},
+    {file = "cryptography-3.4.8-pp37-pypy37_pp73-win_amd64.whl", hash = "sha256:cd65b60cfe004790c795cc35f272e41a3df4631e2fb6b35aa7ac6ef2859d554e"},
+    {file = "cryptography-3.4.8.tar.gz", hash = "sha256:94cc5ed4ceaefcbe5bf38c8fba6a21fc1d365bb8fb826ea1688e3370b2e24a1c"},
 ]
 distlib = [
     {file = "distlib-0.3.2-py2.py3-none-any.whl", hash = "sha256:23e223426b28491b1ced97dc3bbe183027419dfc7982b4fa2f05d5f3ff10711c"},
@@ -1315,8 +1320,8 @@ httpretty = [
     {file = "httpretty-0.9.7.tar.gz", hash = "sha256:66216f26b9d2c52e81808f3e674a6fb65d4bf719721394a1a9be926177e55fbe"},
 ]
 identify = [
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-    {file = "identify-2.2.13.tar.gz", hash = "sha256:7bc6e829392bd017236531963d2d937d66fc27cadc643ac0aba2ce9f26157c79"},
+    {file = "identify-2.2.14-py2.py3-none-any.whl", hash = "sha256:113a76a6ba614d2a3dd408b3504446bcfac0370da5995aa6a17fd7c6dffde02d"},
+    {file = "identify-2.2.14.tar.gz", hash = "sha256:32f465f3c48083f345ad29a9df8419a4ce0674bf4a8c3245191d65c83634bdbf"},
 ]
 idna = [
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@@ -1362,8 +1367,8 @@ more-itertools = [
     {file = "more_itertools-5.0.0-py3-none-any.whl", hash = "sha256:fe7a7cae1ccb57d33952113ff4fa1bc5f879963600ed74918f1236e212ee50b9"},
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     {file = "more_itertools-7.2.0-py3-none-any.whl", hash = "sha256:92b8c4b06dac4f0611c0729b2f2ede52b2e1bac1ab48f089c7ddc12e26bb60c4"},
-    {file = "more-itertools-8.8.0.tar.gz", hash = "sha256:83f0308e05477c68f56ea3a888172c78ed5d5b3c282addb67508e7ba6c8f813a"},
-    {file = "more_itertools-8.8.0-py3-none-any.whl", hash = "sha256:2cf89ec599962f2ddc4d568a05defc40e0a587fbc10d5989713638864c36be4d"},
+    {file = "more-itertools-8.10.0.tar.gz", hash = "sha256:1debcabeb1df793814859d64a81ad7cb10504c24349368ccf214c664c474f41f"},
+    {file = "more_itertools-8.10.0-py3-none-any.whl", hash = "sha256:56ddac45541718ba332db05f464bebfb0768110111affd27f66e0051f276fa43"},
 ]
 msgpack = [
     {file = "msgpack-1.0.2-cp35-cp35m-manylinux1_i686.whl", hash = "sha256:b6d9e2dae081aa35c44af9c4298de4ee72991305503442a5c74656d82b581fe9"},
@@ -1407,18 +1412,12 @@ pastel = [
     {file = "pastel-0.2.1-py2.py3-none-any.whl", hash = "sha256:4349225fcdf6c2bb34d483e523475de5bb04a5c10ef711263452cb37d7dd4364"},
     {file = "pastel-0.2.1.tar.gz", hash = "sha256:e6581ac04e973cac858828c6202c1e1e81fee1dc7de7683f3e1ffe0bfd8a573d"},
 ]
-pathlib2 = [
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-    {file = "pathlib2-2.3.6.tar.gz", hash = "sha256:7d8bcb5555003cdf4a8d2872c538faa3a0f5d20630cb360e518ca3b981795e5f"},
-]
+pathlib2 = []
 pexpect = [
     {file = "pexpect-4.8.0-py2.py3-none-any.whl", hash = "sha256:0b48a55dcb3c05f3329815901ea4fc1537514d6ba867a152b581d69ae3710937"},
     {file = "pexpect-4.8.0.tar.gz", hash = "sha256:fc65a43959d153d0114afe13997d439c22823a27cefceb5ff35c2178c6784c0c"},
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-pkginfo = [
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-    {file = "pkginfo-1.7.1.tar.gz", hash = "sha256:e7432f81d08adec7297633191bbf0bd47faf13cd8724c3a13250e51d542635bd"},
-]
+pkginfo = []
 platformdirs = [
     {file = "platformdirs-2.0.2-py2.py3-none-any.whl", hash = "sha256:0b9547541f599d3d242078ae60b927b3e453f0ad52f58b4d4bc3be86aed3ec41"},
     {file = "platformdirs-2.0.2.tar.gz", hash = "sha256:3b00d081227d9037bbbca521a5787796b5ef5000faea1e43fd76f1d44b06fcfa"},
@@ -1428,12 +1427,12 @@ pluggy = [
     {file = "pluggy-0.13.1.tar.gz", hash = "sha256:15b2acde666561e1298d71b523007ed7364de07029219b604cf808bfa1c765b0"},
 ]
 poetry-core = [
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-    {file = "poetry_core-1.0.4-py2.py3-none-any.whl", hash = "sha256:a99fa921cf84f0521644714bb4b531d9d8f839c64de20aa71fa137f7461a1516"},
+    {file = "poetry-core-1.0.5.tar.gz", hash = "sha256:8cad9893ea70e344b2ce1a75d3834ba3fb1bac8123f89aad758e59e2a5d67805"},
+    {file = "poetry_core-1.0.5-py2.py3-none-any.whl", hash = "sha256:affb0d841d897fbc214fa00765ada432582dcb93b8d0d3a5696712dd96f67dde"},
 ]
 pre-commit = [
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-    {file = "pre_commit-2.14.0.tar.gz", hash = "sha256:2386eeb4cf6633712c7cc9ede83684d53c8cafca6b59f79c738098b51c6d206c"},
+    {file = "pre_commit-2.15.0-py2.py3-none-any.whl", hash = "sha256:a4ed01000afcb484d9eb8d504272e642c4c4099bbad3a6b27e519bd6a3e928a6"},
+    {file = "pre_commit-2.15.0.tar.gz", hash = "sha256:3c25add78dbdfb6a28a651780d5c311ac40dd17f160eb3954a0c59da40a505a7"},
 ]
 ptyprocess = [
     {file = "ptyprocess-0.7.0-py2.py3-none-any.whl", hash = "sha256:4b41f3967fce3af57cc7e94b888626c18bf37a083e3651ca8feeb66d492fef35"},
@@ -1483,26 +1482,18 @@ pyyaml = [
     {file = "PyYAML-5.4.1-cp27-cp27mu-manylinux1_x86_64.whl", hash = "sha256:bb4191dfc9306777bc594117aee052446b3fa88737cd13b7188d0e7aa8162185"},
     {file = "PyYAML-5.4.1-cp36-cp36m-macosx_10_9_x86_64.whl", hash = "sha256:6c78645d400265a062508ae399b60b8c167bf003db364ecb26dcab2bda048253"},
     {file = "PyYAML-5.4.1-cp36-cp36m-manylinux1_x86_64.whl", hash = "sha256:4e0583d24c881e14342eaf4ec5fbc97f934b999a6828693a99157fde912540cc"},
-    {file = "PyYAML-5.4.1-cp36-cp36m-manylinux2014_aarch64.whl", hash = "sha256:72a01f726a9c7851ca9bfad6fd09ca4e090a023c00945ea05ba1638c09dc3347"},
-    {file = "PyYAML-5.4.1-cp36-cp36m-manylinux2014_s390x.whl", hash = "sha256:895f61ef02e8fed38159bb70f7e100e00f471eae2bc838cd0f4ebb21e28f8541"},
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@@ -1564,8 +1555,8 @@ tomlkit = [
     {file = "tomlkit-0.7.2.tar.gz", hash = "sha256:d7a454f319a7e9bd2e249f239168729327e4dd2d27b17dc68be264ad1ce36754"},
 ]
 tox = [
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-    {file = "tox-3.24.2.tar.gz", hash = "sha256:ae442d4d51d5a3afb3711e4c7d94f5ca8461afd27c53f5dd994aba34896cf02d"},
+    {file = "tox-3.24.4-py2.py3-none-any.whl", hash = "sha256:5e274227a53dc9ef856767c21867377ba395992549f02ce55eb549f9fb9a8d10"},
+    {file = "tox-3.24.4.tar.gz", hash = "sha256:c30b57fa2477f1fb7c36aa1d83292d5c2336cd0018119e1b1c17340e2c2708ca"},
 ]
 typing = [
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@@ -1573,17 +1564,17 @@ typing = [
     {file = "typing-3.10.0.0.tar.gz", hash = "sha256:13b4ad211f54ddbf93e5901a9967b1e07720c1d1b78d596ac6a439641aa1b130"},
 ]
 typing-extensions = [
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+    {file = "typing_extensions-3.10.0.2-py2-none-any.whl", hash = "sha256:d8226d10bc02a29bcc81df19a26e56a9647f8b0a6d4a83924139f4a8b01f17b7"},
+    {file = "typing_extensions-3.10.0.2-py3-none-any.whl", hash = "sha256:f1d25edafde516b146ecd0613dabcc61409817af4766fbbcfb8d1ad4ec441a34"},
+    {file = "typing_extensions-3.10.0.2.tar.gz", hash = "sha256:49f75d16ff11f1cd258e1b988ccff82a3ca5570217d7ad8c5f48205dd99a677e"},
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 urllib3 = [
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 virtualenv = [
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+    {file = "virtualenv-20.8.0-py2.py3-none-any.whl", hash = "sha256:a4b987ec31c3c9996cf1bc865332f967fe4a0512c41b39652d6224f696e69da5"},
+    {file = "virtualenv-20.8.0.tar.gz", hash = "sha256:4da4ac43888e97de9cf4fdd870f48ed864bbfd133d2c46cbdec941fed4a25aef"},
 ]
 wcwidth = [
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diff --git a/poetry/__version__.py b/poetry/__version__.py
index 3d30a5ffbec..f6d1f107bf4 100644
--- a/poetry/__version__.py
+++ b/poetry/__version__.py
@@ -1 +1 @@
-__version__ = "1.1.8"
+__version__ = "1.1.9"
diff --git a/pyproject.toml b/pyproject.toml
index eb55fd12270..cfd0c83d983 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "poetry"
-version = "1.1.8"
+version = "1.1.9"
 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 = "~1.0.4"
+poetry-core = "~1.0.5"
 cleo = "^0.8.1"
 clikit = "^0.6.2"
 crashtest = { version = "^0.3.0", python = "^3.6" }