diff --git a/.travis.yml b/.travis.yml
index 42d4d16..0fed68b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -14,17 +14,19 @@
   include:
     - python: 3.5
       dist: xenial  # Bionic has no Python 3.5
+      script: pip install zipp
 
     # Disabled, see https://github.com/sybrenstuvel/python-rsa/issues/131
     #- python: pypy3.5
     #  dist: xenial  # Bionic has no Python 3.5
 
 install:
-  - pip install poetry
-  - poetry install -v
+  - pip install -U pip setuptools  # https://github.com/pypa/virtualenv/issues/1630
+  - pip install pipenv
+  - pipenv install --dev
 
 script:
-  - poetry run py.test tests/
+  - pipenv run py.test tests/
 
 after_success:
-  - poetry run coveralls
+  - pipenv run coveralls
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0b263e2..43c540b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Python-RSA changelog
 
+## Version 4.2 - in development
+
+- Rolled back the switch to Poetry, and reverted back to using Pipenv + setup.py
+  for dependency management. There apparently is an issue no-binary installs of
+  packages build with Poetry. This fixes
+  [#148](https://github.com/sybrenstuvel/python-rsa/issues/148)
+
 
 ## Version 4.1 - released 2020-06-10
 
diff --git a/Pipfile b/Pipfile
new file mode 100644
index 0000000..31a1ada
--- /dev/null
+++ b/Pipfile
@@ -0,0 +1,21 @@
+[[source]]
+url = "https://pypi.org/simple"
+verify_ssl = true
+name = "pypi"
+
+[packages]
+"pyasn1" = ">=0.1.3"
+"pysha3" = {version = "~=1.0, >=1.0",markers = "python_version < '3.6'"}
+
+[dev-packages]
+coveralls = "~=1.8, >=1.8"
+"Sphinx" = "~=2.1, >=2.1"
+"pathlib2" = {version = "~=2.3, >=2.3.4",markers = "python_version < '3.6'"}
+"pytest" = "~=5.0, >=5.0"
+"pytest-cov" = "~=2.7, >=2.7"
+"tox" = "~=3.13, >=3.13"
+"mypy" = "~=0.720, >=0.720"
+"flake8" = "~=3.7, >=3.7"
+
+[requires]
+python_version = "3.7"
diff --git a/Pipfile.lock b/Pipfile.lock
new file mode 100644
index 0000000..77a2030
--- /dev/null
+++ b/Pipfile.lock
@@ -0,0 +1,551 @@
+{
+    "_meta": {
+        "hash": {
+            "sha256": "9f3ee557d56ac9a111d2af3bd82a9c8cfc3969723398e26b95c565ea868f2735"
+        },
+        "pipfile-spec": 6,
+        "requires": {
+            "python_version": "3.7"
+        },
+        "sources": [
+            {
+                "name": "pypi",
+                "url": "https://pypi.org/simple",
+                "verify_ssl": true
+            }
+        ]
+    },
+    "default": {
+        "pyasn1": {
+            "hashes": [
+                "sha256:014c0e9976956a08139dc0712ae195324a75e142284d5f87f1a87ee1b068a359",
+                "sha256:03840c999ba71680a131cfaee6fab142e1ed9bbd9c693e285cc6aca0d555e576",
+                "sha256:0458773cfe65b153891ac249bcf1b5f8f320b7c2ce462151f8fa74de8934becf",
+                "sha256:08c3c53b75eaa48d71cf8c710312316392ed40899cb34710d092e96745a358b7",
+                "sha256:39c7e2ec30515947ff4e87fb6f456dfc6e84857d34be479c9d4a4ba4bf46aa5d",
+                "sha256:5c9414dcfede6e441f7e8f81b43b34e834731003427e5b09e4e00e3172a10f00",
+                "sha256:6e7545f1a61025a4e58bb336952c5061697da694db1cae97b116e9c46abcf7c8",
+                "sha256:78fa6da68ed2727915c4767bb386ab32cdba863caa7dbe473eaae45f9959da86",
+                "sha256:7ab8a544af125fb704feadb008c99a88805126fb525280b2270bb25cc1d78a12",
+                "sha256:99fcc3c8d804d1bc6d9a099921e39d827026409a58f2a720dcdb89374ea0c776",
+                "sha256:aef77c9fb94a3ac588e87841208bdec464471d9871bd5050a287cc9a475cd0ba",
+                "sha256:e89bf84b5437b532b0803ba5c9a5e054d21fec423a89952a74f87fa2c9b7bce2",
+                "sha256:fec3e9d8e36808a28efb59b489e4528c10ad0f480e57dcc32b4de5c9d8c9fdf3"
+            ],
+            "index": "pypi",
+            "version": "==0.4.8"
+        },
+        "pysha3": {
+            "hashes": [
+                "sha256:0060a66be16665d90c432f55a0ba1f6480590cfb7d2ad389e688a399183474f0",
+                "sha256:11a2ba7a2e1d9669d0052fc8fb30f5661caed5512586ecbeeaf6bf9478ab5c48",
+                "sha256:386998ee83e313b6911327174e088021f9f2061cbfa1651b97629b761e9ef5c4",
+                "sha256:41be70b06c8775a9e4d4eeb52f2f6a3f356f17539a54eac61f43a29e42fd453d",
+                "sha256:4416f16b0f1605c25f627966f76873e432971824778b369bd9ce1bb63d6566d9",
+                "sha256:571a246308a7b63f15f5aa9651f99cf30f2a6acba18eddf28f1510935968b603",
+                "sha256:59111c08b8f34495575d12e5f2ce3bafb98bea470bc81e70c8b6df99aef0dd2f",
+                "sha256:5ec8da7c5c70a53b5fa99094af3ba8d343955b212bc346a0d25f6ff75853999f",
+                "sha256:684cb01d87ed6ff466c135f1c83e7e4042d0fc668fa20619f581e6add1d38d77",
+                "sha256:68c3a60a39f9179b263d29e221c1bd6e01353178b14323c39cc70593c30f21c5",
+                "sha256:6e6a84efb7856f5d760ee55cd2b446972cb7b835676065f6c4f694913ea8f8d9",
+                "sha256:827b308dc025efe9b6b7bae36c2e09ed0118a81f792d888548188e97b9bf9a3d",
+                "sha256:93abd775dac570cb9951c4e423bcb2bc6303a9d1dc0dc2b7afa2dd401d195b24",
+                "sha256:9c778fa8b161dc9348dc5cc361e94d54aa5ff18413788f4641f6600d4893a608",
+                "sha256:9fdd28884c5d0b4edfed269b12badfa07f1c89dbc5c9c66dd279833894a9896b",
+                "sha256:c7c2adcc43836223680ebdf91f1d3373543dc32747c182c8ca2e02d1b69ce030",
+                "sha256:c93a2676e6588abcfaecb73eb14485c81c63b94fca2000a811a7b4fb5937b8e8",
+                "sha256:cd5c961b603bd2e6c2b5ef9976f3238a561c58569945d4165efb9b9383b050ef",
+                "sha256:f9046d59b3e72aa84f6dae83a040bd1184ebd7fef4e822d38186a8158c89e3cf",
+                "sha256:fd7e66999060d079e9c0e8893e78d8017dad4f59721f6fe0be6307cd32127a07",
+                "sha256:fe988e73f2ce6d947220624f04d467faf05f1bbdbc64b0a201296bb3af92739e"
+            ],
+            "markers": "python_version < '3.6'",
+            "version": "==1.0.2"
+        }
+    },
+    "develop": {
+        "alabaster": {
+            "hashes": [
+                "sha256:446438bdcca0e05bd45ea2de1668c1d9b032e1a9154c2c259092d77031ddd359",
+                "sha256:a661d72d58e6ea8a57f7a86e37d86716863ee5e92788398526d58b26a4e4dc02"
+            ],
+            "version": "==0.7.12"
+        },
+        "appdirs": {
+            "hashes": [
+                "sha256:7d5d0167b2b1ba821647616af46a749d1c653740dd0d2415100fe26e27afdf41",
+                "sha256:a841dacd6b99318a741b166adb07e19ee71a274450e68237b4650ca1055ab128"
+            ],
+            "version": "==1.4.4"
+        },
+        "attrs": {
+            "hashes": [
+                "sha256:08a96c641c3a74e44eb59afb61a24f2cb9f4d7188748e76ba4bb5edfa3cb7d1c",
+                "sha256:f7b7ce16570fe9965acd6d30101a28f62fb4a7f9e926b3bbc9b61f8b04247e72"
+            ],
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
+            "version": "==19.3.0"
+        },
+        "babel": {
+            "hashes": [
+                "sha256:1aac2ae2d0d8ea368fa90906567f5c08463d98ade155c0c4bfedd6a0f7160e38",
+                "sha256:d670ea0b10f8b723672d3a6abeb87b565b244da220d76b4dba1b66269ec152d4"
+            ],
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
+            "version": "==2.8.0"
+        },
+        "certifi": {
+            "hashes": [
+                "sha256:5ad7e9a056d25ffa5082862e36f119f7f7cec6457fa07ee2f8c339814b80c9b1",
+                "sha256:9cd41137dc19af6a5e03b630eefe7d1f458d964d406342dd3edf625839b944cc"
+            ],
+            "version": "==2020.4.5.2"
+        },
+        "chardet": {
+            "hashes": [
+                "sha256:84ab92ed1c4d4f16916e05906b6b75a6c0fb5db821cc65e70cbd64a3e2a5eaae",
+                "sha256:fc323ffcaeaed0e0a02bf4d117757b98aed530d9ed4531e3e15460124c106691"
+            ],
+            "version": "==3.0.4"
+        },
+        "coverage": {
+            "hashes": [
+                "sha256:00f1d23f4336efc3b311ed0d807feb45098fc86dee1ca13b3d6768cdab187c8a",
+                "sha256:01333e1bd22c59713ba8a79f088b3955946e293114479bbfc2e37d522be03355",
+                "sha256:0cb4be7e784dcdc050fc58ef05b71aa8e89b7e6636b99967fadbdba694cf2b65",
+                "sha256:0e61d9803d5851849c24f78227939c701ced6704f337cad0a91e0972c51c1ee7",
+                "sha256:1601e480b9b99697a570cea7ef749e88123c04b92d84cedaa01e117436b4a0a9",
+                "sha256:2742c7515b9eb368718cd091bad1a1b44135cc72468c731302b3d641895b83d1",
+                "sha256:2d27a3f742c98e5c6b461ee6ef7287400a1956c11421eb574d843d9ec1f772f0",
+                "sha256:402e1744733df483b93abbf209283898e9f0d67470707e3c7516d84f48524f55",
+                "sha256:5c542d1e62eece33c306d66fe0a5c4f7f7b3c08fecc46ead86d7916684b36d6c",
+                "sha256:5f2294dbf7875b991c381e3d5af2bcc3494d836affa52b809c91697449d0eda6",
+                "sha256:6402bd2fdedabbdb63a316308142597534ea8e1895f4e7d8bf7476c5e8751fef",
+                "sha256:66460ab1599d3cf894bb6baee8c684788819b71a5dc1e8fa2ecc152e5d752019",
+                "sha256:782caea581a6e9ff75eccda79287daefd1d2631cc09d642b6ee2d6da21fc0a4e",
+                "sha256:79a3cfd6346ce6c13145731d39db47b7a7b859c0272f02cdb89a3bdcbae233a0",
+                "sha256:7a5bdad4edec57b5fb8dae7d3ee58622d626fd3a0be0dfceda162a7035885ecf",
+                "sha256:8fa0cbc7ecad630e5b0f4f35b0f6ad419246b02bc750de7ac66db92667996d24",
+                "sha256:a027ef0492ede1e03a8054e3c37b8def89a1e3c471482e9f046906ba4f2aafd2",
+                "sha256:a3f3654d5734a3ece152636aad89f58afc9213c6520062db3978239db122f03c",
+                "sha256:a82b92b04a23d3c8a581fc049228bafde988abacba397d57ce95fe95e0338ab4",
+                "sha256:acf3763ed01af8410fc36afea23707d4ea58ba7e86a8ee915dfb9ceff9ef69d0",
+                "sha256:adeb4c5b608574a3d647011af36f7586811a2c1197c861aedb548dd2453b41cd",
+                "sha256:b83835506dfc185a319031cf853fa4bb1b3974b1f913f5bb1a0f3d98bdcded04",
+                "sha256:bb28a7245de68bf29f6fb199545d072d1036a1917dca17a1e75bbb919e14ee8e",
+                "sha256:bf9cb9a9fd8891e7efd2d44deb24b86d647394b9705b744ff6f8261e6f29a730",
+                "sha256:c317eaf5ff46a34305b202e73404f55f7389ef834b8dbf4da09b9b9b37f76dd2",
+                "sha256:dbe8c6ae7534b5b024296464f387d57c13caa942f6d8e6e0346f27e509f0f768",
+                "sha256:de807ae933cfb7f0c7d9d981a053772452217df2bf38e7e6267c9cbf9545a796",
+                "sha256:dead2ddede4c7ba6cb3a721870f5141c97dc7d85a079edb4bd8d88c3ad5b20c7",
+                "sha256:dec5202bfe6f672d4511086e125db035a52b00f1648d6407cc8e526912c0353a",
+                "sha256:e1ea316102ea1e1770724db01998d1603ed921c54a86a2efcb03428d5417e489",
+                "sha256:f90bfc4ad18450c80b024036eaf91e4a246ae287701aaa88eaebebf150868052"
+            ],
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4' and python_version < '4'",
+            "version": "==5.1"
+        },
+        "coveralls": {
+            "hashes": [
+                "sha256:4b6bfc2a2a77b890f556bc631e35ba1ac21193c356393b66c84465c06218e135",
+                "sha256:67188c7ec630c5f708c31552f2bcdac4580e172219897c4136504f14b823132f"
+            ],
+            "index": "pypi",
+            "version": "==1.11.1"
+        },
+        "distlib": {
+            "hashes": [
+                "sha256:2e166e231a26b36d6dfe35a48c4464346620f8645ed0ace01ee31822b288de21"
+            ],
+            "version": "==0.3.0"
+        },
+        "docopt": {
+            "hashes": [
+                "sha256:49b3a825280bd66b3aa83585ef59c4a8c82f2c8a522dbe754a8bc8d08c85c491"
+            ],
+            "version": "==0.6.2"
+        },
+        "docutils": {
+            "hashes": [
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+                "sha256:c2de3a60e9e7d07be26b7f2b00ca0309c207e06c100f9cc2a94931fc75a478fc"
+            ],
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'",
+            "version": "==0.16"
+        },
+        "filelock": {
+            "hashes": [
+                "sha256:18d82244ee114f543149c66a6e0c14e9c4f8a1044b5cdaadd0f82159d6a6ff59",
+                "sha256:929b7d63ec5b7d6b71b0fa5ac14e030b3f70b75747cef1b10da9b879fef15836"
+            ],
+            "version": "==3.0.12"
+        },
+        "flake8": {
+            "hashes": [
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+                "sha256:f04b9fcbac03b0a3e58c0ab3a0ecc462e023a9faf046d57794184028123aa208"
+            ],
+            "index": "pypi",
+            "version": "==3.8.3"
+        },
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+            "hashes": [
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+            ],
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+            "version": "==2.9"
+        },
+        "imagesize": {
+            "hashes": [
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+                "sha256:b1f6b5a4eab1f73479a50fb79fcf729514a900c341d8503d62a62dbc4127a2b1"
+            ],
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
+            "version": "==1.2.0"
+        },
+        "importlib-metadata": {
+            "hashes": [
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+                "sha256:15ec6c0fd909e893e3a08b3a7c76ecb149122fb14b7efe1199ddd4c7c57ea958"
+            ],
+            "markers": "python_version < '3.8'",
+            "version": "==1.6.1"
+        },
+        "jinja2": {
+            "hashes": [
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+                "sha256:f0a4641d3cf955324a89c04f3d94663aa4d638abe8f733ecd3582848e1c37035"
+            ],
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'",
+            "version": "==2.11.2"
+        },
+        "markupsafe": {
+            "hashes": [
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+                "sha256:09027a7803a62ca78792ad89403b1b7a73a01c8cb65909cd876f7fcebd79b161",
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+                "sha256:13d3144e1e340870b25e7b10b98d779608c02016d5184cfb9927a9f10c689f42",
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+                "sha256:29872e92839765e546828bb7754a68c418d927cd064fd4708fab9fe9c8bb116b",
+                "sha256:43a55c2930bbc139570ac2452adf3d70cdbb3cfe5912c71cdce1c2c6bbd9c5d1",
+                "sha256:46c99d2de99945ec5cb54f23c8cd5689f6d7177305ebff350a58ce5f8de1669e",
+                "sha256:500d4957e52ddc3351cabf489e79c91c17f6e0899158447047588650b5e69183",
+                "sha256:535f6fc4d397c1563d08b88e485c3496cf5784e927af890fb3c3aac7f933ec66",
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+                "sha256:b00c1de48212e4cc9603895652c5c410df699856a2853135b3967591e4beebc2",
+                "sha256:b1282f8c00509d99fef04d8ba936b156d419be841854fe901d8ae224c59f0be5",
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+        },
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+            ],
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+        },
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+            ],
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+            "version": "==1.25.9"
+        },
+        "virtualenv": {
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+                "sha256:a116629d4e7f4d03433b8afa27f43deba09d48bc48f5ecefa4f015a178efb6cf",
+                "sha256:a730548b27366c5e6cbdf6f97406d861cccece2e22275e8e1a757aeff5e00c70"
+            ],
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
+            "version": "==20.0.21"
+        },
+        "wcwidth": {
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+                "sha256:8c6b5b6ee1360b842645f336d9e5d68c55817c26d3050f46b235ef2bc650e48f"
+            ],
+            "version": "==0.2.4"
+        },
+        "zipp": {
+            "hashes": [
+                "sha256:aa36550ff0c0b7ef7fa639055d797116ee891440eac1a56f378e2d3179e0320b",
+                "sha256:c599e4d75c98f6798c509911d08a22e6c021d074469042177c8c86fb92eefd96"
+            ],
+            "markers": "python_version >= '3.6'",
+            "version": "==3.1.0"
+        }
+    }
+}
diff --git a/doc/installation.rst b/doc/installation.rst
index 00c46d8..3ab3ab1 100644
--- a/doc/installation.rst
+++ b/doc/installation.rst
@@ -9,6 +9,12 @@
 the library system-wide, or use ``pip install --user rsa`` to install the
 library in your home directory.
 
+Installation from source is also quite easy. Download the source and
+then type::
+
+    python setup.py install
+
+
 The sources are tracked in our `Git repository`_ at
 GitHub. It also hosts the `issue tracker`_.
 
diff --git a/poetry.lock b/poetry.lock
deleted file mode 100644
index 173c007..0000000
--- a/poetry.lock
+++ /dev/null
@@ -1,1008 +0,0 @@
-[[package]]
-category = "dev"
-description = "A configurable sidebar-enabled Sphinx theme"
-name = "alabaster"
-optional = false
-python-versions = "*"
-version = "0.7.12"
-
-[[package]]
-category = "dev"
-description = "A small Python module for determining appropriate platform-specific dirs, e.g. a \"user data dir\"."
-name = "appdirs"
-optional = false
-python-versions = "*"
-version = "1.4.4"
-
-[[package]]
-category = "dev"
-description = "Atomic file writes."
-marker = "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"
-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"
-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 = "Python package for providing Mozilla's CA Bundle."
-name = "certifi"
-optional = false
-python-versions = "*"
-version = "2020.4.5.2"
-
-[[package]]
-category = "dev"
-description = "Universal encoding detector for Python 2 and 3"
-name = "chardet"
-optional = false
-python-versions = "*"
-version = "3.0.4"
-
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-    {file = "typing_extensions-3.7.4.2-py2-none-any.whl", hash = "sha256:f8d2bd89d25bc39dabe7d23df520442fa1d8969b82544370e03d88b5a591c392"},
-    {file = "typing_extensions-3.7.4.2-py3-none-any.whl", hash = "sha256:6e95524d8a547a91e08f404ae485bbb71962de46967e1b71a0cb89af24e761c5"},
-    {file = "typing_extensions-3.7.4.2.tar.gz", hash = "sha256:79ee589a3caca649a9bfd2a8de4709837400dfa00b6cc81962a1e6a1815969ae"},
-]
-urllib3 = [
-    {file = "urllib3-1.25.9-py2.py3-none-any.whl", hash = "sha256:88206b0eb87e6d677d424843ac5209e3fb9d0190d0ee169599165ec25e9d9115"},
-    {file = "urllib3-1.25.9.tar.gz", hash = "sha256:3018294ebefce6572a474f0604c2021e33b3fd8006ecd11d62107a5d2a963527"},
-]
-virtualenv = [
-    {file = "virtualenv-20.0.21-py2.py3-none-any.whl", hash = "sha256:a730548b27366c5e6cbdf6f97406d861cccece2e22275e8e1a757aeff5e00c70"},
-    {file = "virtualenv-20.0.21.tar.gz", hash = "sha256:a116629d4e7f4d03433b8afa27f43deba09d48bc48f5ecefa4f015a178efb6cf"},
-]
-wcwidth = [
-    {file = "wcwidth-0.2.4-py2.py3-none-any.whl", hash = "sha256:79375666b9954d4a1a10739315816324c3e73110af9d0e102d906fdb0aec009f"},
-    {file = "wcwidth-0.2.4.tar.gz", hash = "sha256:8c6b5b6ee1360b842645f336d9e5d68c55817c26d3050f46b235ef2bc650e48f"},
-]
-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/pyproject.toml b/pyproject.toml
deleted file mode 100644
index ca337c8..0000000
--- a/pyproject.toml
+++ /dev/null
@@ -1,50 +0,0 @@
-[tool.poetry]
-name = "rsa"
-version = "4.2-dev0"
-license = "Apache-2.0"
-description = "Pure-Python RSA implementation"
-authors = ["Sybren A. Stüvel <sybren@stuvel.eu>"]
-homepage = "https://stuvel.eu/rsa"
-documentation = "https://stuvel.eu/python-rsa-doc/"
-repository = "https://github.com/sybrenstuvel/python-rsa/"
-classifiers=[
-    'Development Status :: 5 - Production/Stable',
-    'Intended Audience :: Developers',
-    'Intended Audience :: Education',
-    'Intended Audience :: Information Technology',
-    'Operating System :: OS Independent',
-    'Topic :: Security :: Cryptography',
-]
-
-packages = [
-    { include="rsa", from="." },
-]
-
-[tool.poetry.scripts]
-pyrsa-decrypt = "rsa.cli:decrypt"
-pyrsa-encrypt = "rsa.cli:encrypt"
-pyrsa-keygen = "rsa.cli:keygen"
-pyrsa-priv2pub = "rsa.util:private_to_public"
-pyrsa-sign = "rsa.cli:sign"
-pyrsa-verify = "rsa.cli:verify"
-
-
-[tool.poetry.dependencies]
-python = "^3.5"
-pyasn1 = ">=0.1.3"
-pysha3 = {version="^1.0", python="~3.5"}
-
-[tool.poetry.dev-dependencies]
-coveralls = "^1.8"
-Sphinx = "^2.1"
-pathlib2 = {version="^2.3.4", python="~3.5"}
-pytest = "^5.0"
-pytest-cov = "^2.7"
-tox = "^3.13"
-mypy = "^0.720"
-flake8 = "^3.7"
-
-
-[build-system]
-requires = ["poetry>=0.12"]
-build-backend = "poetry.masonry.api"
diff --git a/setup.py b/setup.py
new file mode 100755
index 0000000..7a6b872
--- /dev/null
+++ b/setup.py
@@ -0,0 +1,67 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+#  Copyright 2011 Sybren A. Stüvel <sybren@stuvel.eu>
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+
+# io.open is needed for projects that support Python 2.7. It ensures open()
+# defaults to text mode with universal newlines, and accepts an argument to
+# specify the text encoding Python 3 only projects can skip this import.
+from io import open
+from setuptools import setup
+
+with open('README.md', encoding='utf-8') as f:
+    long_description = f.read()
+
+if __name__ == '__main__':
+    setup(name='rsa',
+          version='4.2-dev0',
+          description='Pure-Python RSA implementation',
+          long_description=long_description,
+          long_description_content_type='text/markdown',
+          author='Sybren A. Stuvel',
+          author_email='sybren@stuvel.eu',
+          maintainer='Sybren A. Stuvel',
+          maintainer_email='sybren@stuvel.eu',
+          url='https://stuvel.eu/rsa',
+          packages=['rsa'],
+          license='ASL 2',
+          classifiers=[
+              'Development Status :: 5 - Production/Stable',
+              'Intended Audience :: Developers',
+              'Intended Audience :: Education',
+              'Intended Audience :: Information Technology',
+              'License :: OSI Approved :: Apache Software License',
+              'Operating System :: OS Independent',
+              'Programming Language :: Python',
+              'Programming Language :: Python :: 3',
+              'Programming Language :: Python :: 3.5',
+              'Programming Language :: Python :: 3.6',
+              'Programming Language :: Python :: 3.7',
+              'Programming Language :: Python :: Implementation :: CPython',
+              'Programming Language :: Python :: Implementation :: PyPy',
+              'Topic :: Security :: Cryptography',
+          ],
+          install_requires=[
+              'pyasn1 >= 0.1.3',
+          ],
+          entry_points={'console_scripts': [
+              'pyrsa-priv2pub = rsa.util:private_to_public',
+              'pyrsa-keygen = rsa.cli:keygen',
+              'pyrsa-encrypt = rsa.cli:encrypt',
+              'pyrsa-decrypt = rsa.cli:decrypt',
+              'pyrsa-sign = rsa.cli:sign',
+              'pyrsa-verify = rsa.cli:verify',
+          ]},
+
+          )
diff --git a/tox.ini b/tox.ini
index 0446ef5..7329d2b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,13 +7,13 @@
 addopts = -v --cov rsa --cov-report term-missing
 
 [testenv]
-whitelist_externals = poetry
+deps = pipenv
 commands =
-    poetry install -v
-    poetry run py.test tests/
+    pipenv install --dev --deploy
+    pipenv run py.test tests/
 
 [testenv:py37]
-whitelist_externals = poetry
+whitelist_externals = pipenv
 commands=
-    poetry install -v
-    poetry run py.test --doctest-modules rsa tests/
+    pipenv install -v
+    pipenv run py.test --doctest-modules rsa tests/
diff --git a/update_version.sh b/update_version.sh
index 313b7a5..89c5447 100755
--- a/update_version.sh
+++ b/update_version.sh
@@ -9,11 +9,10 @@
 
 sed "s/__date__\s=\s'[^']*'/__date__ = '$DATE'/" -i rsa/__init__.py
 sed "s/__version__\s=\s'[^']*'/__version__ = '$1'/" -i rsa/__init__.py
-
-poetry version $1
+sed "s/version='[^']*'/version='$1'/" -i setup.py
 
 git diff
 echo
 echo "Don't forget to commit and tag:"
-echo git commit -m \'Bumped version to $1\' pyproject.toml rsa/__init__.py
+echo git commit -m \'Bumped version to $1\' rsa/__init__.py setup.py
 echo git tag -a version-$1 -m \'Tagged version $1\'