diff --git a/.github/workflows/libtmux-ci.yml b/.github/workflows/libtmux-ci.yml
index 2fa0f67a6..49a0fdb3d 100644
--- a/.github/workflows/libtmux-ci.yml
+++ b/.github/workflows/libtmux-ci.yml
@@ -9,7 +9,7 @@ jobs:
     strategy:
       matrix:
         python-version: [ '3.x' ]
-        tmux-version: [ '2.6', '2.7', '2.8', 'master' ]
+        tmux-version: [ '2.6', '2.7', '2.8', '3.0', 'master' ]
     steps:
     - uses: actions/checkout@v1
     - name: Cache tmux build ${{ matrix.tmux-version }}
@@ -43,18 +43,18 @@ jobs:
         python-version: ${{ matrix.python-version }}
     - name: Install python dependencies
       run: |
-        python -m pip install --upgrade pip pipenv setuptools
-        pipenv install -d --system --skip-lock
+        python -m pip install --upgrade poetry
+        poetry install
     - name: Lint with flake8
       run: |
-        pipenv run flake8
+        poetry run flake8
     - name: Test with pytest
       continue-on-error: ${{ matrix.tmux-version == 'master' }}
       run: |
         export PATH=$HOME/tmux-builds/tmux-${{ matrix.tmux-version }}/bin:$PATH
         ls $HOME/tmux-builds/tmux-${{ matrix.tmux-version }}/bin
         tmux -V
-        pipenv run py.test --cov=./ --cov-report=xml
+        poetry run py.test --cov=./ --cov-report=xml
     - uses: codecov/codecov-action@v1
       with:
         token: ${{ secrets.CODECOV_TOKEN }}
diff --git a/.tmuxp-before-script.sh b/.tmuxp-before-script.sh
new file mode 100755
index 000000000..0721faabd
--- /dev/null
+++ b/.tmuxp-before-script.sh
@@ -0,0 +1,3 @@
+#!/bin/sh
+poetry shell --no-ansi --no-interaction &2> /dev/null
+poetry install --no-ansi --no-interaction &2> /dev/null
diff --git a/.tmuxp.yaml b/.tmuxp.yaml
index e543520dc..081fd2fdb 100644
--- a/.tmuxp.yaml
+++ b/.tmuxp.yaml
@@ -1,8 +1,8 @@
 session_name: libtmux
 start_directory: ./ # load session relative to config location (project root).
-before_script: pipenv install --dev --skip-lock
-shell_command_before: 
-  - '[ -d `pipenv --venv` ] && source `pipenv --venv`/bin/activate && reset'
+before_script: ./.tmuxp-before-script.sh
+shell_command_before:
+- '[ -f .venv/bin/activate ] && source .venv/bin/activate && reset'
 windows:
 - window_name: libtmux
   focus: True
diff --git a/CHANGES b/CHANGES
index 6898ff2f5..dc77225d9 100644
--- a/CHANGES
+++ b/CHANGES
@@ -5,6 +5,9 @@ Changelog
 Here you can find the recent changes to libtmux
 
 - Add ``project_urls`` to setup.py
+- :issue:`293` Move from Pipfile to poetry
+- Fix show_option test in tmux 3.0
+- Clean up handle_option_error comments
 
 0.8.2 <2019-06-02>
 ------------------
diff --git a/Pipfile b/Pipfile
deleted file mode 100644
index 3c66bfa54..000000000
--- a/Pipfile
+++ /dev/null
@@ -1,22 +0,0 @@
-[[source]]
-url = "https://pypi.org/simple"
-verify_ssl = true
-name = "pypi"
-
-[dev-packages]
-docutils = "*"
-alagitpull = "*"
-Sphinx = ">=2.0.0"
-isort = "*"
-flake8 = "*"
-pytest = "*"
-libtmux = {path = ".",editable = true}
-black = "==19.3b0"
-sphinx-issues = "*"
-pytest-cov = "*"
-coverage = "*"
-
-[packages]
-
-[requires]
-python_version = "3"
diff --git a/Pipfile.lock b/Pipfile.lock
deleted file mode 100644
index 507f59e18..000000000
--- a/Pipfile.lock
+++ /dev/null
@@ -1,402 +0,0 @@
-{
-    "_meta": {
-        "hash": {
-            "sha256": "14762a9227e306c249f69e3e27aa089d4e3aebb8e7cfee87e2b6ffb0849592f1"
-        },
-        "pipfile-spec": 6,
-        "requires": {
-            "python_version": "3"
-        },
-        "sources": [
-            {
-                "name": "pypi",
-                "url": "https://pypi.org/simple",
-                "verify_ssl": true
-            }
-        ]
-    },
-    "default": {},
-    "develop": {
-        "alabaster": {
-            "hashes": [
-                "sha256:446438bdcca0e05bd45ea2de1668c1d9b032e1a9154c2c259092d77031ddd359",
-                "sha256:a661d72d58e6ea8a57f7a86e37d86716863ee5e92788398526d58b26a4e4dc02"
-            ],
-            "version": "==0.7.12"
-        },
-        "alagitpull": {
-            "hashes": [
-                "sha256:a56c1672f17eb3bb55c63f93fc71e7914e0a7fa0707ceefbf8d5e422bf4a9f8a"
-            ],
-            "index": "pypi",
-            "version": "==0.0.23"
-        },
-        "appdirs": {
-            "hashes": [
-                "sha256:9e5896d1372858f8dd3344faf4e5014d21849c756c8d5701f78f8a103b372d92",
-                "sha256:d8b24664561d0d34ddfaec54636d502d7cea6e29c3eaf68f3df6180863e2166e"
-            ],
-            "version": "==1.4.3"
-        },
-        "attrs": {
-            "hashes": [
-                "sha256:08a96c641c3a74e44eb59afb61a24f2cb9f4d7188748e76ba4bb5edfa3cb7d1c",
-                "sha256:f7b7ce16570fe9965acd6d30101a28f62fb4a7f9e926b3bbc9b61f8b04247e72"
-            ],
-            "version": "==19.3.0"
-        },
-        "babel": {
-            "hashes": [
-                "sha256:1aac2ae2d0d8ea368fa90906567f5c08463d98ade155c0c4bfedd6a0f7160e38",
-                "sha256:d670ea0b10f8b723672d3a6abeb87b565b244da220d76b4dba1b66269ec152d4"
-            ],
-            "version": "==2.8.0"
-        },
-        "black": {
-            "hashes": [
-                "sha256:09a9dcb7c46ed496a9850b76e4e825d6049ecd38b611f1224857a79bd985a8cf",
-                "sha256:68950ffd4d9169716bcb8719a56c07a2f4485354fec061cdd5910aa07369731c"
-            ],
-            "index": "pypi",
-            "version": "==19.3b0"
-        },
-        "certifi": {
-            "hashes": [
-                "sha256:017c25db2a153ce562900032d5bc68e9f191e44e9a0f762f373977de9df1fbb3",
-                "sha256:25b64c7da4cd7479594d035c08c2d809eb4aab3a26e5a990ea98cc450c320f1f"
-            ],
-            "version": "==2019.11.28"
-        },
-        "chardet": {
-            "hashes": [
-                "sha256:84ab92ed1c4d4f16916e05906b6b75a6c0fb5db821cc65e70cbd64a3e2a5eaae",
-                "sha256:fc323ffcaeaed0e0a02bf4d117757b98aed530d9ed4531e3e15460124c106691"
-            ],
-            "version": "==3.0.4"
-        },
-        "click": {
-            "hashes": [
-                "sha256:2335065e6395b9e67ca716de5f7526736bfa6ceead690adf616d925bdc622b13",
-                "sha256:5b94b49521f6456670fdb30cd82a4eca9412788a93fa6dd6df72c94d5a8ff2d7"
-            ],
-            "version": "==7.0"
-        },
-        "coverage": {
-            "hashes": [
-                "sha256:15cf13a6896048d6d947bf7d222f36e4809ab926894beb748fc9caa14605d9c3",
-                "sha256:1daa3eceed220f9fdb80d5ff950dd95112cd27f70d004c7918ca6dfc6c47054c",
-                "sha256:1e44a022500d944d42f94df76727ba3fc0a5c0b672c358b61067abb88caee7a0",
-                "sha256:25dbf1110d70bab68a74b4b9d74f30e99b177cde3388e07cc7272f2168bd1477",
-                "sha256:3230d1003eec018ad4a472d254991e34241e0bbd513e97a29727c7c2f637bd2a",
-                "sha256:3dbb72eaeea5763676a1a1efd9b427a048c97c39ed92e13336e726117d0b72bf",
-                "sha256:5012d3b8d5a500834783689a5d2292fe06ec75dc86ee1ccdad04b6f5bf231691",
-                "sha256:51bc7710b13a2ae0c726f69756cf7ffd4362f4ac36546e243136187cfcc8aa73",
-                "sha256:527b4f316e6bf7755082a783726da20671a0cc388b786a64417780b90565b987",
-                "sha256:722e4557c8039aad9592c6a4213db75da08c2cd9945320220634f637251c3894",
-                "sha256:76e2057e8ffba5472fd28a3a010431fd9e928885ff480cb278877c6e9943cc2e",
-                "sha256:77afca04240c40450c331fa796b3eab6f1e15c5ecf8bf2b8bee9706cd5452fef",
-                "sha256:7afad9835e7a651d3551eab18cbc0fdb888f0a6136169fbef0662d9cdc9987cf",
-                "sha256:9bea19ac2f08672636350f203db89382121c9c2ade85d945953ef3c8cf9d2a68",
-                "sha256:a8b8ac7876bc3598e43e2603f772d2353d9931709345ad6c1149009fd1bc81b8",
-                "sha256:b0840b45187699affd4c6588286d429cd79a99d509fe3de0f209594669bb0954",
-                "sha256:b26aaf69713e5674efbde4d728fb7124e429c9466aeaf5f4a7e9e699b12c9fe2",
-                "sha256:b63dd43f455ba878e5e9f80ba4f748c0a2156dde6e0e6e690310e24d6e8caf40",
-                "sha256:be18f4ae5a9e46edae3f329de2191747966a34a3d93046dbdf897319923923bc",
-                "sha256:c312e57847db2526bc92b9bfa78266bfbaabac3fdcd751df4d062cd4c23e46dc",
-                "sha256:c60097190fe9dc2b329a0eb03393e2e0829156a589bd732e70794c0dd804258e",
-                "sha256:c62a2143e1313944bf4a5ab34fd3b4be15367a02e9478b0ce800cb510e3bbb9d",
-                "sha256:cc1109f54a14d940b8512ee9f1c3975c181bbb200306c6d8b87d93376538782f",
-                "sha256:cd60f507c125ac0ad83f05803063bed27e50fa903b9c2cfee3f8a6867ca600fc",
-                "sha256:d513cc3db248e566e07a0da99c230aca3556d9b09ed02f420664e2da97eac301",
-                "sha256:d649dc0bcace6fcdb446ae02b98798a856593b19b637c1b9af8edadf2b150bea",
-                "sha256:d7008a6796095a79544f4da1ee49418901961c97ca9e9d44904205ff7d6aa8cb",
-                "sha256:da93027835164b8223e8e5af2cf902a4c80ed93cb0909417234f4a9df3bcd9af",
-                "sha256:e69215621707119c6baf99bda014a45b999d37602cb7043d943c76a59b05bf52",
-                "sha256:ea9525e0fef2de9208250d6c5aeeee0138921057cd67fcef90fbed49c4d62d37",
-                "sha256:fca1669d464f0c9831fd10be2eef6b86f5ebd76c724d1e0706ebdff86bb4adf0"
-            ],
-            "index": "pypi",
-            "version": "==5.0.3"
-        },
-        "docutils": {
-            "hashes": [
-                "sha256:0c5b78adfbf7762415433f5515cd5c9e762339e23369dbe8000d84a4bf4ab3af",
-                "sha256:c2de3a60e9e7d07be26b7f2b00ca0309c207e06c100f9cc2a94931fc75a478fc"
-            ],
-            "index": "pypi",
-            "version": "==0.16"
-        },
-        "entrypoints": {
-            "hashes": [
-                "sha256:589f874b313739ad35be6e0cd7efde2a4e9b6fea91edcc34e58ecbb8dbe56d19",
-                "sha256:c70dd71abe5a8c85e55e12c19bd91ccfeec11a6e99044204511f9ed547d48451"
-            ],
-            "version": "==0.3"
-        },
-        "flake8": {
-            "hashes": [
-                "sha256:45681a117ecc81e870cbf1262835ae4af5e7a8b08e40b944a8a6e6b895914cfb",
-                "sha256:49356e766643ad15072a789a20915d3c91dc89fd313ccd71802303fd67e4deca"
-            ],
-            "index": "pypi",
-            "version": "==3.7.9"
-        },
-        "idna": {
-            "hashes": [
-                "sha256:7588d1c14ae4c77d74036e8c22ff447b26d0fde8f007354fd48a7814db15b7cb",
-                "sha256:a068a21ceac8a4d63dbfd964670474107f541babbd2250d61922f029858365fa"
-            ],
-            "version": "==2.9"
-        },
-        "imagesize": {
-            "hashes": [
-                "sha256:6965f19a6a2039c7d48bca7dba2473069ff854c36ae6f19d2cde309d998228a1",
-                "sha256:b1f6b5a4eab1f73479a50fb79fcf729514a900c341d8503d62a62dbc4127a2b1"
-            ],
-            "version": "==1.2.0"
-        },
-        "isort": {
-            "hashes": [
-                "sha256:54da7e92468955c4fceacd0c86bd0ec997b0e1ee80d97f67c35a78b719dccab1",
-                "sha256:6e811fcb295968434526407adb8796944f1988c5b65e8139058f2014cbe100fd"
-            ],
-            "index": "pypi",
-            "version": "==4.3.21"
-        },
-        "jinja2": {
-            "hashes": [
-                "sha256:93187ffbc7808079673ef52771baa950426fd664d3aad1d0fa3e95644360e250",
-                "sha256:b0eaf100007721b5c16c1fc1eecb87409464edc10469ddc9a22a27a99123be49"
-            ],
-            "version": "==2.11.1"
-        },
-        "libtmux": {
-            "editable": true,
-            "path": "."
-        },
-        "markupsafe": {
-            "hashes": [
-                "sha256:00bc623926325b26bb9605ae9eae8a215691f33cae5df11ca5424f06f2d1f473",
-                "sha256:09027a7803a62ca78792ad89403b1b7a73a01c8cb65909cd876f7fcebd79b161",
-                "sha256:09c4b7f37d6c648cb13f9230d847adf22f8171b1ccc4d5682398e77f40309235",
-                "sha256:1027c282dad077d0bae18be6794e6b6b8c91d58ed8a8d89a89d59693b9131db5",
-                "sha256:13d3144e1e340870b25e7b10b98d779608c02016d5184cfb9927a9f10c689f42",
-                "sha256:24982cc2533820871eba85ba648cd53d8623687ff11cbb805be4ff7b4c971aff",
-                "sha256:29872e92839765e546828bb7754a68c418d927cd064fd4708fab9fe9c8bb116b",
-                "sha256:43a55c2930bbc139570ac2452adf3d70cdbb3cfe5912c71cdce1c2c6bbd9c5d1",
-                "sha256:46c99d2de99945ec5cb54f23c8cd5689f6d7177305ebff350a58ce5f8de1669e",
-                "sha256:500d4957e52ddc3351cabf489e79c91c17f6e0899158447047588650b5e69183",
-                "sha256:535f6fc4d397c1563d08b88e485c3496cf5784e927af890fb3c3aac7f933ec66",
-                "sha256:596510de112c685489095da617b5bcbbac7dd6384aeebeda4df6025d0256a81b",
-                "sha256:62fe6c95e3ec8a7fad637b7f3d372c15ec1caa01ab47926cfdf7a75b40e0eac1",
-                "sha256:6788b695d50a51edb699cb55e35487e430fa21f1ed838122d722e0ff0ac5ba15",
-                "sha256:6dd73240d2af64df90aa7c4e7481e23825ea70af4b4922f8ede5b9e35f78a3b1",
-                "sha256:717ba8fe3ae9cc0006d7c451f0bb265ee07739daf76355d06366154ee68d221e",
-                "sha256:79855e1c5b8da654cf486b830bd42c06e8780cea587384cf6545b7d9ac013a0b",
-                "sha256:7c1699dfe0cf8ff607dbdcc1e9b9af1755371f92a68f706051cc8c37d447c905",
-                "sha256:88e5fcfb52ee7b911e8bb6d6aa2fd21fbecc674eadd44118a9cc3863f938e735",
-                "sha256:8defac2f2ccd6805ebf65f5eeb132adcf2ab57aa11fdf4c0dd5169a004710e7d",
-                "sha256:98c7086708b163d425c67c7a91bad6e466bb99d797aa64f965e9d25c12111a5e",
-                "sha256:9add70b36c5666a2ed02b43b335fe19002ee5235efd4b8a89bfcf9005bebac0d",
-                "sha256:9bf40443012702a1d2070043cb6291650a0841ece432556f784f004937f0f32c",
-                "sha256:ade5e387d2ad0d7ebf59146cc00c8044acbd863725f887353a10df825fc8ae21",
-                "sha256:b00c1de48212e4cc9603895652c5c410df699856a2853135b3967591e4beebc2",
-                "sha256:b1282f8c00509d99fef04d8ba936b156d419be841854fe901d8ae224c59f0be5",
-                "sha256:b2051432115498d3562c084a49bba65d97cf251f5a331c64a12ee7e04dacc51b",
-                "sha256:ba59edeaa2fc6114428f1637ffff42da1e311e29382d81b339c1817d37ec93c6",
-                "sha256:c8716a48d94b06bb3b2524c2b77e055fb313aeb4ea620c8dd03a105574ba704f",
-                "sha256:cd5df75523866410809ca100dc9681e301e3c27567cf498077e8551b6d20e42f",
-                "sha256:cdb132fc825c38e1aeec2c8aa9338310d29d337bebbd7baa06889d09a60a1fa2",
-                "sha256:e249096428b3ae81b08327a63a485ad0878de3fb939049038579ac0ef61e17e7",
-                "sha256:e8313f01ba26fbbe36c7be1966a7b7424942f670f38e666995b88d012765b9be"
-            ],
-            "version": "==1.1.1"
-        },
-        "mccabe": {
-            "hashes": [
-                "sha256:ab8a6258860da4b6677da4bd2fe5dc2c659cff31b3ee4f7f5d64e79735b80d42",
-                "sha256:dd8d182285a0fe56bace7f45b5e7d1a6ebcbf524e8f3bd87eb0f125271b8831f"
-            ],
-            "version": "==0.6.1"
-        },
-        "more-itertools": {
-            "hashes": [
-                "sha256:5dd8bcf33e5f9513ffa06d5ad33d78f31e1931ac9a18f33d37e77a180d393a7c",
-                "sha256:b1ddb932186d8a6ac451e1d95844b382f55e12686d51ca0c68b6f61f2ab7a507"
-            ],
-            "version": "==8.2.0"
-        },
-        "packaging": {
-            "hashes": [
-                "sha256:170748228214b70b672c581a3dd610ee51f733018650740e98c7df862a583f73",
-                "sha256:e665345f9eef0c621aa0bf2f8d78cf6d21904eef16a93f020240b704a57f1334"
-            ],
-            "version": "==20.1"
-        },
-        "pluggy": {
-            "hashes": [
-                "sha256:15b2acde666561e1298d71b523007ed7364de07029219b604cf808bfa1c765b0",
-                "sha256:966c145cd83c96502c3c3868f50408687b38434af77734af1e9ca461a4081d2d"
-            ],
-            "version": "==0.13.1"
-        },
-        "py": {
-            "hashes": [
-                "sha256:5e27081401262157467ad6e7f851b7aa402c5852dbcb3dae06768434de5752aa",
-                "sha256:c20fdd83a5dbc0af9efd622bee9a5564e278f6380fffcacc43ba6f43db2813b0"
-            ],
-            "version": "==1.8.1"
-        },
-        "pycodestyle": {
-            "hashes": [
-                "sha256:95a2219d12372f05704562a14ec30bc76b05a5b297b21a5dfe3f6fac3491ae56",
-                "sha256:e40a936c9a450ad81df37f549d676d127b1b66000a6c500caa2b085bc0ca976c"
-            ],
-            "version": "==2.5.0"
-        },
-        "pyflakes": {
-            "hashes": [
-                "sha256:17dbeb2e3f4d772725c777fabc446d5634d1038f234e77343108ce445ea69ce0",
-                "sha256:d976835886f8c5b31d47970ed689944a0262b5f3afa00a5a7b4dc81e5449f8a2"
-            ],
-            "version": "==2.1.1"
-        },
-        "pygments": {
-            "hashes": [
-                "sha256:2a3fe295e54a20164a9df49c75fa58526d3be48e14aceba6d6b1e8ac0bfd6f1b",
-                "sha256:98c8aa5a9f778fcd1026a17361ddaf7330d1b7c62ae97c3bb0ae73e0b9b6b0fe"
-            ],
-            "version": "==2.5.2"
-        },
-        "pyparsing": {
-            "hashes": [
-                "sha256:4c830582a84fb022400b85429791bc551f1f4871c33f23e44f353119e92f969f",
-                "sha256:c342dccb5250c08d45fd6f8b4a559613ca603b57498511740e65cd11a2e7dcec"
-            ],
-            "version": "==2.4.6"
-        },
-        "pytest": {
-            "hashes": [
-                "sha256:0d5fe9189a148acc3c3eb2ac8e1ac0742cb7618c084f3d228baaec0c254b318d",
-                "sha256:ff615c761e25eb25df19edddc0b970302d2a9091fbce0e7213298d85fb61fef6"
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-                "sha256:cc6742d8bac45070217169f5f72ceee1e0e55b0221f54bcf24845972d3a47f2b",
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-        },
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-                "sha256:1c557d7d0e871de1f5ccd5833f60fb2550652da6be2693c1e02300743d21500d",
-                "sha256:b02c06db6cf09c12dd25137e563b31700d3b80fcc4ad23abb7a315f2789819be"
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-        "six": {
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-                "sha256:8f3cd2e254d8f793e7f3d6d9df77b92252b52637291d0f0da013c76ea2724b6c"
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-                "sha256:209f257d7533fdb3cb73bdbd24f436239ca3b2fa67d56f6ff88e86be08cc5ef0",
-                "sha256:df3bac3df4c2c01363f3dd2cfa78cce2840a79b9f1c2d2de9ce8d31683992f52"
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-                "sha256:bd9fc24bcb748a8d51fd4ecaade681350aa63009a347a8c14e637895444dfab6"
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-                "sha256:f242a81d423f59617a8e5cf16f5d4d74e28ee9a66f9e5b637a18082991db5a9a"
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-            "version": "==1.1.4"
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-        "toml": {
-            "hashes": [
-                "sha256:229f81c57791a41d65e399fc06bf0848bab550a9dfd5ed66df18ce5f05e73d5c",
-                "sha256:235682dd292d5899d361a811df37e04a8828a5b1da3115886b73cf81ebc9100e"
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-        "urllib3": {
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-            "version": "==1.25.8"
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-        "wcwidth": {
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-            "version": "==0.1.8"
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-}
diff --git a/libtmux/common.py b/libtmux/common.py
index 9681d3e0c..46ce6ce18 100644
--- a/libtmux/common.py
+++ b/libtmux/common.py
@@ -636,13 +636,16 @@ def session_check_name(session_name):
 def handle_option_error(error):
     """Raises exception if error in option command found.
 
-    Purpose: As of tmux 2.4, there are now 3 different types of option errors:
+    In tmux 3.0, show-option and show-window-otion return invalid option instead of
+    unknown option. See https://github.com/tmux/tmux/blob/3.0/cmd-show-options.c.
+
+    In tmux >2.4, there are 3 different types of option errors:
 
     - unknown option
     - invalid option
     - ambiguous option
 
-    Before 2.4, unknown option was the user.
+    In tmux <2.4, unknown option was the only option.
 
     All errors raised will have the base error of :exc:`exc.OptionError`. So to
     catch any option error, use ``except exc.OptionError``.
diff --git a/poetry.lock b/poetry.lock
new file mode 100644
index 000000000..c7f7d35b6
--- /dev/null
+++ b/poetry.lock
@@ -0,0 +1,1476 @@
+[[package]]
+category = "dev"
+description = "A configurable sidebar-enabled Sphinx theme"
+name = "alabaster"
+optional = false
+python-versions = "*"
+version = "0.7.12"
+
+[[package]]
+category = "dev"
+description = "Cleverly-named alabaster sub-theme for git-pull projects"
+name = "alagitpull"
+optional = false
+python-versions = "*"
+version = "0.0.23"
+
+[package.dependencies]
+alabaster = "<0.8"
+
+[[package]]
+category = "dev"
+description = "A small Python module for determining appropriate platform-specific dirs, e.g. a \"user data dir\"."
+marker = "python_version >= \"3.6\" and python_version < \"4.0\""
+name = "appdirs"
+optional = false
+python-versions = "*"
+version = "1.4.4"
+
+[[package]]
+category = "dev"
+description = "Atomic file writes."
+marker = "python_version < \"3\" or python_version >= \"3\" and sys_platform == \"win32\""
+name = "atomicwrites"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "1.4.0"
+
+[[package]]
+category = "dev"
+description = "Classes Without Boilerplate"
+marker = "python_version < \"3\" or python_version >= \"3\" 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.*"
+version = "19.3.0"
+
+[package.extras]
+azure-pipelines = ["coverage", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface", "pytest-azurepipelines"]
+dev = ["coverage", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface", "sphinx", "pre-commit"]
+docs = ["sphinx", "zope.interface"]
+tests = ["coverage", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface"]
+
+[[package]]
+category = "dev"
+description = "Internationalization utilities"
+marker = "python_version < \"3\" or python_version >= \"3\""
+name = "babel"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "2.8.0"
+
+[package.dependencies]
+pytz = ">=2015.7"
+
+[[package]]
+category = "dev"
+description = "Backport of functools.lru_cache"
+marker = "python_version < \"3.2\""
+name = "backports.functools-lru-cache"
+optional = false
+python-versions = ">=2.6"
+version = "1.6.1"
+
+[package.extras]
+docs = ["sphinx", "jaraco.packaging (>=3.2)", "rst.linker (>=1.9)"]
+testing = ["pytest (>=3.5,<3.7.3 || >3.7.3)", "pytest-checkdocs (>=1.2.3)", "pytest-flake8", "pytest-black-multipy", "pytest-cov"]
+
+[[package]]
+category = "dev"
+description = "The uncompromising code formatter."
+marker = "python_version >= \"3.6\" and python_version < \"4.0\""
+name = "black"
+optional = false
+python-versions = ">=3.6"
+version = "19.10b0"
+
+[package.dependencies]
+appdirs = "*"
+attrs = ">=18.1.0"
+click = ">=6.5"
+pathspec = ">=0.6,<1"
+regex = "*"
+toml = ">=0.9.4"
+typed-ast = ">=1.4.0"
+
+[package.extras]
+d = ["aiohttp (>=3.3.2)", "aiohttp-cors"]
+
+[[package]]
+category = "dev"
+description = "An easy safelist-based HTML-sanitizing tool."
+name = "bleach"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+version = "3.1.5"
+
+[package.dependencies]
+packaging = "*"
+six = ">=1.9.0"
+webencodings = "*"
+
+[[package]]
+category = "dev"
+description = "Python package for providing Mozilla's CA Bundle."
+name = "certifi"
+optional = false
+python-versions = "*"
+version = "2020.6.20"
+
+[[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"
+description = "Composable command line interface toolkit"
+marker = "python_version >= \"3.6\" and python_version < \"4.0\""
+name = "click"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+version = "7.1.2"
+
+[[package]]
+category = "dev"
+description = "Hosted coverage reports for GitHub, Bitbucket and Gitlab"
+name = "codecov"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "2.1.7"
+
+[package.dependencies]
+coverage = "*"
+requests = ">=2.7.9"
+
+[[package]]
+category = "dev"
+description = "Cross-platform colored terminal text."
+marker = "sys_platform == \"win32\" and python_version < \"3\" or python_version >= \"3\" and sys_platform == \"win32\""
+name = "colorama"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+version = "0.4.3"
+
+[[package]]
+category = "dev"
+description = "Updated configparser from Python 3.7 for Python 2.6+."
+marker = "python_version < \"3.2\""
+name = "configparser"
+optional = false
+python-versions = ">=2.6"
+version = "4.0.2"
+
+[package.extras]
+docs = ["sphinx", "jaraco.packaging (>=3.2)", "rst.linker (>=1.9)"]
+testing = ["pytest (>=3.5,<3.7.3 || >3.7.3)", "pytest-checkdocs (>=1.2)", "pytest-flake8", "pytest-black-multipy"]
+
+[[package]]
+category = "dev"
+description = "Backports and enhancements for the contextlib module"
+marker = "python_version < \"3\""
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+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "0.6.0.post1"
+
+[[package]]
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+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 = "5.1"
+
+[package.extras]
+toml = ["toml"]
+
+[[package]]
+category = "dev"
+description = "Style checker for Sphinx (or other) RST documentation"
+name = "doc8"
+optional = false
+python-versions = "*"
+version = "0.8.1"
+
+[package.dependencies]
+Pygments = "*"
+chardet = "*"
+docutils = "*"
+restructuredtext-lint = ">=0.7"
+six = "*"
+stevedore = "*"
+
+[[package]]
+category = "dev"
+description = "Docutils -- Python Documentation Utilities"
+name = "docutils"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+version = "0.16"
+
+[[package]]
+category = "dev"
+description = "Python 3.4 Enum backported to 3.3, 3.2, 3.1, 2.7, 2.6, 2.5, and 2.4"
+marker = "python_version < \"3.4\""
+name = "enum34"
+optional = false
+python-versions = "*"
+version = "1.1.10"
+
+[[package]]
+category = "dev"
+description = "the modular source code checker: pep8 pyflakes and co"
+name = "flake8"
+optional = false
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,>=2.7"
+version = "3.8.3"
+
+[package.dependencies]
+mccabe = ">=0.6.0,<0.7.0"
+pycodestyle = ">=2.6.0a1,<2.7.0"
+pyflakes = ">=2.2.0,<2.3.0"
+
+[package.dependencies.configparser]
+python = "<3.2"
+version = "*"
+
+[package.dependencies.enum34]
+python = "<3.4"
+version = "*"
+
+[package.dependencies.functools32]
+python = "<3.2"
+version = "*"
+
+[package.dependencies.importlib-metadata]
+python = "<3.8"
+version = "*"
+
+[package.dependencies.typing]
+python = "<3.5"
+version = "*"
+
+[[package]]
+category = "dev"
+description = "Python function signatures from PEP362 for Python 2.6, 2.7 and 3.2+"
+marker = "python_version < \"3\""
+name = "funcsigs"
+optional = false
+python-versions = "*"
+version = "1.0.2"
+
+[[package]]
+category = "dev"
+description = "Backport of the functools module from Python 3.2.3 for use on 2.7 and PyPy."
+marker = "python_version < \"3.2\""
+name = "functools32"
+optional = false
+python-versions = "*"
+version = "3.2.3-2"
+
+[[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 = "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 = "2.10"
+
+[[package]]
+category = "dev"
+description = "Getting image size from png/jpeg/jpeg2000/gif file"
+marker = "python_version < \"3\" or python_version >= \"3\""
+name = "imagesize"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "1.2.0"
+
+[[package]]
+category = "dev"
+description = "Read metadata from Python packages"
+marker = "python_version < \"3.8\" or python_version >= \"3\" and python_version < \"3.8\""
+name = "importlib-metadata"
+optional = false
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
+version = "1.7.0"
+
+[package.dependencies]
+zipp = ">=0.5"
+
+[package.dependencies.configparser]
+python = "<3"
+version = ">=3.5"
+
+[package.dependencies.contextlib2]
+python = "<3"
+version = "*"
+
+[package.dependencies.pathlib2]
+python = "<3"
+version = "*"
+
+[package.extras]
+docs = ["sphinx", "rst.linker"]
+testing = ["packaging", "pep517", "importlib-resources (>=1.3)"]
+
+[[package]]
+category = "dev"
+description = "A Python utility / library to sort Python imports."
+name = "isort"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "4.3.21"
+
+[package.dependencies]
+[package.dependencies."backports.functools-lru-cache"]
+python = "<3.2"
+version = "*"
+
+[package.dependencies.futures]
+python = "<3.2"
+version = "*"
+
+[package.extras]
+pipfile = ["pipreqs", "requirementslib"]
+pyproject = ["toml"]
+requirements = ["pipreqs", "pip-api"]
+xdg_home = ["appdirs (>=1.4.0)"]
+
+[[package]]
+category = "dev"
+description = "A very fast and expressive template engine."
+marker = "python_version < \"3\" or python_version >= \"3\""
+name = "jinja2"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+version = "2.11.2"
+
+[package.dependencies]
+MarkupSafe = ">=0.23"
+
+[package.extras]
+i18n = ["Babel (>=0.8)"]
+
+[[package]]
+category = "dev"
+description = "Safely add untrusted strings to HTML/XML markup."
+marker = "python_version < \"3\" or python_version >= \"3\""
+name = "markupsafe"
+optional = false
+python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*"
+version = "1.1.1"
+
+[[package]]
+category = "dev"
+description = "McCabe checker, plugin for flake8"
+name = "mccabe"
+optional = false
+python-versions = "*"
+version = "0.6.1"
+
+[[package]]
+category = "dev"
+description = "More routines for operating on iterables, beyond itertools"
+marker = "python_version <= \"2.7\""
+name = "more-itertools"
+optional = false
+python-versions = "*"
+version = "5.0.0"
+
+[package.dependencies]
+six = ">=1.0.0,<2.0.0"
+
+[[package]]
+category = "dev"
+description = "More routines for operating on iterables, beyond itertools"
+marker = "python_version >= \"3\""
+name = "more-itertools"
+optional = false
+python-versions = ">=3.5"
+version = "8.4.0"
+
+[[package]]
+category = "dev"
+description = "Core utilities for Python packages"
+name = "packaging"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "20.4"
+
+[package.dependencies]
+pyparsing = ">=2.0.2"
+six = "*"
+
+[[package]]
+category = "dev"
+description = "Object-oriented filesystem paths"
+marker = "python_version < \"3\""
+name = "pathlib2"
+optional = false
+python-versions = "*"
+version = "2.3.4"
+
+[package.dependencies]
+six = "*"
+
+[package.dependencies.scandir]
+python = "<3.5"
+version = "*"
+
+[[package]]
+category = "dev"
+description = "Object-oriented filesystem paths"
+marker = "python_version >= \"3\" and python_version < \"3.6\""
+name = "pathlib2"
+optional = false
+python-versions = "*"
+version = "2.3.5"
+
+[package.dependencies]
+six = "*"
+
+[[package]]
+category = "dev"
+description = "Utility library for gitignore style pattern matching of file paths."
+marker = "python_version >= \"3.6\" and python_version < \"4.0\""
+name = "pathspec"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+version = "0.8.0"
+
+[[package]]
+category = "dev"
+description = "Python Build Reasonableness"
+name = "pbr"
+optional = false
+python-versions = "*"
+version = "5.4.5"
+
+[[package]]
+category = "dev"
+description = "Query metadatdata from sdists / bdists / installed packages."
+name = "pkginfo"
+optional = false
+python-versions = "*"
+version = "1.5.0.1"
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+]
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+    {file = "urllib3-1.25.9.tar.gz", hash = "sha256:3018294ebefce6572a474f0604c2021e33b3fd8006ecd11d62107a5d2a963527"},
+]
+wcwidth = [
+    {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"},
+    {file = "webencodings-0.5.1.tar.gz", hash = "sha256:b36a1c245f2d304965eb4e0a82848379241dc04b865afcc4aab16748587e1923"},
+]
+zipp = [
+    {file = "zipp-1.2.0-py2.py3-none-any.whl", hash = "sha256:e0d9e63797e483a30d27e09fffd308c59a700d365ec34e93cc100844168bf921"},
+    {file = "zipp-1.2.0.tar.gz", hash = "sha256:c70410551488251b0fee67b460fb9a536af8d6f9f008ad10ac51f615b6a521b1"},
+]
diff --git a/poetry.toml b/poetry.toml
new file mode 100644
index 000000000..ab1033bd3
--- /dev/null
+++ b/poetry.toml
@@ -0,0 +1,2 @@
+[virtualenvs]
+in-project = true
diff --git a/pyproject.toml b/pyproject.toml
index 0097e9f6e..e09f49d9c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,2 +1,38 @@
 [tool.black]
 skip-string-normalization = true
+
+[tool.poetry]
+name = "libtmux"
+version = "0.8.2"
+description = "scripting library / orm for tmux"
+license = "MIT"
+authors = ["Tony Narlock <tony@git-pull.com>"]
+
+[tool.poetry.dependencies]
+python = "~2.7 || ^3.5"
+
+[tool.poetry.dev-dependencies]
+alagitpull = "*"
+black = {version="==19.10b0", python="^3.6"}
+doc8 = "*"
+docutils = "*"
+flake8 = "*"
+isort = "*"
+pytest = [
+  {version="<4.7.0", python="<3"},
+  {version="*", python=">=3"}
+]
+pathlib2 = {version="<2.3.5", python="<3"}  # Untangle pytest peer-dependency
+pytest-rerunfailures = "*"
+sphinx = [
+  {version="<2", python="<3"},
+  {version="*", python=">=3"}
+]
+sphinx-issues = "*"
+twine = "*"
+codecov = "*"
+coverage = "*"
+pytest-cov = [
+  {version="<2.10.0", python="<3"},
+  {version="*", python=">=3"}
+]
diff --git a/tests/test_session.py b/tests/test_session.py
index 79c986120..44a318292 100644
--- a/tests/test_session.py
+++ b/tests/test_session.py
@@ -132,7 +132,10 @@ def test_empty_session_option_returns_None(session):
 
 def test_show_option_unknown(session):
     """Session.show_option raises UnknownOption for invalid option."""
-    with pytest.raises(exc.UnknownOption):
+    cmd_exception = exc.UnknownOption
+    if has_gte_version('3.0'):
+        cmd_exception = exc.InvalidOption
+    with pytest.raises(cmd_exception):
         session.show_option('moooz')
 
 
diff --git a/tests/test_window.py b/tests/test_window.py
index 5d0a674c4..78c511f59 100644
--- a/tests/test_window.py
+++ b/tests/test_window.py
@@ -213,7 +213,10 @@ def test_show_window_option_unknown(session):
     """Window.show_window_option raises UnknownOption for bad option key."""
     window = session.new_window(window_name='test_window')
 
-    with pytest.raises(exc.UnknownOption):
+    cmd_exception = exc.UnknownOption
+    if has_gte_version('3.0'):
+        cmd_exception = exc.InvalidOption
+    with pytest.raises(cmd_exception):
         window.show_window_option('moooz')