diff --git a/.gitignore b/.gitignore
index 2b7fa08..58dfb41 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,6 +4,7 @@ dist
 .tox/
 .coverage
 coverage.xml
+.idea/
 
 # caches
 .mypy_cache/
diff --git a/.travis.yml b/.travis.yml
index 997bf4c..3f44adb 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -14,6 +14,8 @@ before_cache:
 jobs:
   include:
   # linux
+  - python: '3.9'
+    script: python3 -m tox -e py39 -- --cov-report=xml
   - python: '3.8'
     script: python3 -m tox -e py38 -- --cov-report=xml
   - python: '3.7'
diff --git a/Pipfile b/Pipfile
index 6714ba0..5a50daf 100644
--- a/Pipfile
+++ b/Pipfile
@@ -5,25 +5,25 @@ verify_ssl = true
 
 [dev-packages]
 pipenv-setup = {editable = true,path = "."}
-pytest = {markers = "python_version>='3.6'",version = "~=5.2"}
-pytest-mypy = {markers = "python_version>='3.5'",version = "~=0.3"}
-pytest-cov = "~=2.7"
-pytest-datadir = "~=1.3"
-pytest-xdist = "~=1.29"
-tox = "~=3.14"
-autopep8 = "~=1.4"
+pytest = "*"
+pytest-mypy = "*"
+pytest-cov = "*"
+pytest-datadir = "*"
+pytest-xdist = "*"
+tox = "*"
+autopep8 = "*"
 
 [packages]
-pipfile = "~=0.0"
-black = {markers = "python_version>='3.6'",version = "==19.10b0"}
-colorama = "~=0.4"
-packaging = "~=20.0"
-requirementslib = "~=1.5"
-vistir = "~=0.4"
-autopep8 = {markers = "python_version<'3.6'",version = "~=1.4"}
-six = "~=1.12"
-typing = {markers = "python_version<'3.7'", version = "~=3.7"}
-chardet = ">=3.0.0, <=5.0.0"
+pipfile = "*"
+black = {markers = "python_version>='3.6'",version = ">=19.10b0"}
+colorama = "*"
+packaging = "*"
+requirementslib = "*"
+vistir = "*"
+autopep8 = {markers = "python_version<'3.6'"}
+six = "*"
+typing = {markers = "python_version<'3.7'"}
+chardet = "*"
 
 [scripts]
 # use this to sync this pipfile to setup.py, explained in CONTRIBUTING.md
diff --git a/Pipfile.lock b/Pipfile.lock
index d5a7f31..3154cb4 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "c557535619753e8940aed5d6621e3608d6ea2276c0272444d206a61777c59e4a"
+            "sha256": "581e474c1ca685853bd784d4df26bcce23662b68b0bfedf573935e8182410087"
         },
         "pipfile-spec": 6,
         "requires": {},
@@ -14,63 +14,58 @@
         ]
     },
     "default": {
-        "appdirs": {
-            "hashes": [
-                "sha256:7d5d0167b2b1ba821647616af46a749d1c653740dd0d2415100fe26e27afdf41",
-                "sha256:a841dacd6b99318a741b166adb07e19ee71a274450e68237b4650ca1055ab128"
-            ],
-            "version": "==1.4.4"
-        },
         "attrs": {
             "hashes": [
-                "sha256:08a96c641c3a74e44eb59afb61a24f2cb9f4d7188748e76ba4bb5edfa3cb7d1c",
-                "sha256:f7b7ce16570fe9965acd6d30101a28f62fb4a7f9e926b3bbc9b61f8b04247e72"
+                "sha256:149e90d6d8ac20db7a955ad60cf0e6881a3f20d37096140088356da6c716b0b1",
+                "sha256:ef6aaac3ca6cd92904cdd0d83f629a15f18053ec84e6432106f7a4d04ae4f5fb"
             ],
-            "version": "==19.3.0"
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'",
+            "version": "==21.2.0"
         },
         "autopep8": {
             "hashes": [
-                "sha256:60fd8c4341bab59963dafd5d2a566e94f547e660b9b396f772afe67d8481dbf0"
+                "sha256:44f0932855039d2c15c4510d6df665e4730f2b8582704fa48f9c55bd3e17d979",
+                "sha256:ed77137193bbac52d029a52c59bec1b0629b5a186c495f1eb21b126ac466083f"
             ],
-            "index": "pypi",
             "markers": "python_version < '3.6'",
-            "version": "==1.5.3"
+            "version": "==1.6.0"
         },
         "black": {
             "hashes": [
-                "sha256:1b30e59be925fafc1ee4565e5e08abef6b03fe455102883820fe5ee2e4734e0b",
-                "sha256:c2edb73a08e9e0e6f65a0e6af18b059b8b1cdd5bef997d7a0b181df93dc81539"
+                "sha256:6eb7448da9143ee65b856a5f3676b7dda98ad9abe0f87fce8c59291f15e82a5b",
+                "sha256:a9952229092e325fe5f3dae56d81f639b23f7131eb840781947e4b2886030f33"
             ],
             "index": "pypi",
             "markers": "python_version >= '3.6'",
-            "version": "==19.10b0"
+            "version": "==21.10b0"
         },
         "cached-property": {
             "hashes": [
-                "sha256:3a026f1a54135677e7da5ce819b0c690f156f37976f3e30c5430740725203d7f",
-                "sha256:9217a59f14a5682da7c4b8829deadbfc194ac22e9908ccf7c8820234e80a1504"
+                "sha256:9fa5755838eecbb2d234c3aa390bd80fbd3ac6b6869109bfc1b499f7bd89a130",
+                "sha256:df4f613cf7ad9a588cc381aaf4a512d26265ecebd5eb9e1ba12f1319eb85a6a0"
             ],
-            "version": "==1.5.1"
+            "version": "==1.5.2"
         },
         "cerberus": {
             "hashes": [
-                "sha256:302e6694f206dd85cb63f13fd5025b31ab6d38c99c50c6d769f8fa0b0f299589"
+                "sha256:d1b21b3954b2498d9a79edf16b3170a3ac1021df88d197dc2ce5928ba519237c"
             ],
-            "version": "==1.3.2"
+            "version": "==1.3.4"
         },
         "certifi": {
             "hashes": [
-                "sha256:5930595817496dd21bb8dc35dad090f1c2cd0adfaf21204bf6732ca5d8ee34d3",
-                "sha256:8fc0819f1f30ba15bdb34cceffb9ef04d99f420f68eb75d901e9560b8749fc41"
+                "sha256:78884e7c1d4b00ce3cea67b44566851c4343c120abd683433ce934a68ea58872",
+                "sha256:d62a0163eb4c2344ac042ab2bdf75399a71a2d8c7d47eac2e2ee91b9d6339569"
             ],
-            "version": "==2020.6.20"
+            "version": "==2021.10.8"
         },
         "chardet": {
             "hashes": [
-                "sha256:84ab92ed1c4d4f16916e05906b6b75a6c0fb5db821cc65e70cbd64a3e2a5eaae",
-                "sha256:fc323ffcaeaed0e0a02bf4d117757b98aed530d9ed4531e3e15460124c106691"
+                "sha256:0d6f53a15db4120f2b08c94f11e7d93d2c911ee118b6b30a04ec3ee8310179fa",
+                "sha256:f864054d66fd9118f2e67044ac8981a54775ec5b67aed0441892edb553d21da5"
             ],
-            "version": "==3.0.4"
+            "index": "pypi",
+            "version": "==4.0.0"
         },
         "charset-normalizer": {
             "hashes": [
@@ -82,40 +77,41 @@
         },
         "click": {
             "hashes": [
-                "sha256:d2b5255c7c6349bc1bd1e59e08cd12acbbd63ce649f2588755783aa94dfb6b1a",
-                "sha256:dacca89f4bfadd5de3d7489b7c8a566eee0d3676333fbb50030263894c38c0dc"
+                "sha256:353f466495adaeb40b6b5f592f9f91cb22372351c84caeb068132442a4518ef3",
+                "sha256:410e932b050f5eed773c4cda94de75971c89cdb3155a72a0831139a79e5ecb5b"
             ],
-            "version": "==7.1.2"
+            "markers": "python_version >= '3.6'",
+            "version": "==8.0.3"
         },
         "colorama": {
             "hashes": [
-                "sha256:7d73d2a99753107a36ac6b455ee49046802e59d9d076ef8e47b61499fa29afff",
-                "sha256:e96da0d330793e2cb9485e9ddfd918d456036c7149416295932478192f4436a1"
+                "sha256:5941b2b48a20143d2267e95b1c2a7603ce057ee39fd88e7329b0c292aa16869b",
+                "sha256:9f47eda37229f68eee03b24b9748937c7dc3868f906e8ba69fbcbdd3bc5dc3e2"
             ],
             "index": "pypi",
-            "version": "==0.4.3"
+            "version": "==0.4.4"
         },
         "distlib": {
             "hashes": [
-                "sha256:8c09de2c67b3e7deef7184574fc060ab8a793e7adbb183d942c389c8b13c52fb",
-                "sha256:edf6116872c863e1aa9d5bb7cb5e05a022c519a4594dc703843343a9ddd9bff1"
+                "sha256:c8b54e8454e5bf6237cc84c20e8264c3e991e824ef27e8f1e81049867d861e31",
+                "sha256:d982d0751ff6eaaab5e2ec8e691d949ee80eddf01a62eaa96ddb11531fe16b05"
             ],
-            "version": "==0.3.1"
+            "version": "==0.3.3"
         },
         "idna": {
             "hashes": [
-                "sha256:b307872f855b18632ce0c21c5e45be78c0ea7ae4c15c828c20788b26921eb3f6",
-                "sha256:b97d804b1e9b523befed77c48dacec60e6dcb0b5391d57af6a65a312a90648c0"
+                "sha256:84d9dd047ffa80596e0f246e2eab0b391788b0503584e8945f2368256d2735ff",
+                "sha256:9d643ff0a55b762d5cdb124b8eaa99c66322e2157b69160bc32796e824360e6d"
             ],
-            "version": "==2.10"
+            "markers": "python_version >= '3'",
+            "version": "==3.3"
         },
-        "importlib-metadata": {
+        "mypy-extensions": {
             "hashes": [
-                "sha256:90bb658cdbbf6d1735b6341ce708fc7024a3e14e99ffdc5783edea9f9b077f83",
-                "sha256:dc15b2969b4ce36305c51eebe62d418ac7791e9a157911d58bfb1f9ccd8e2070"
+                "sha256:090fedd75945a69ae91ce1303b5824f428daf5a028d2f6ab8a299250a846f15d",
+                "sha256:2d82818f5bb3e369420cb3c4060a7970edba416647068eb4c5343488a6c604a8"
             ],
-            "markers": "python_version < '3.8'",
-            "version": "==1.7.0"
+            "version": "==0.4.3"
         },
         "orderedmultidict": {
             "hashes": [
@@ -126,32 +122,41 @@
         },
         "packaging": {
             "hashes": [
-                "sha256:4357f74f47b9c12db93624a82154e9b120fa8293699949152b22065d556079f8",
-                "sha256:998416ba6962ae7fbd6596850b80e17859a5753ba17c32284f67bfff33784181"
+                "sha256:096d689d78ca690e4cd8a89568ba06d07ca097e3306a4381635073ca91479966",
+                "sha256:14317396d1e8cdb122989b916fa2c7e9ca8e2be9e8060a6eff75b6b7b4d8a7e0"
             ],
             "index": "pypi",
-            "version": "==20.4"
+            "version": "==21.2"
         },
         "pathspec": {
             "hashes": [
-                "sha256:7d91249d21749788d07a2d0f94147accd8f845507400749ea19c1ec9054a12b0",
-                "sha256:da45173eb3a6f2a5a487efba21f050af2b41948be6ab52b6a1e3ff22bb8b7061"
+                "sha256:7d15c4ddb0b5c802d161efc417ec1a2558ea2653c2e8ad9c19098201dc1c993a",
+                "sha256:e564499435a2673d586f6b2130bb5b95f04a3ba06f81b8f895b651a3c76aabb1"
             ],
-            "version": "==0.8.0"
+            "version": "==0.9.0"
         },
         "pep517": {
             "hashes": [
-                "sha256:576c480be81f3e1a70a16182c762311eb80d1f8a7b0d11971e5234967d7a342c",
-                "sha256:8e6199cf1288d48a0c44057f112acf18aa5ebabbf73faa242f598fbe145ba29e"
+                "sha256:931378d93d11b298cf511dd634cf5ea4cb249a28ef84160b3247ee9afb4e8ab0",
+                "sha256:dd884c326898e2c6e11f9e0b64940606a93eb10ea022a2e067959f3a110cf161"
+            ],
+            "version": "==0.12.0"
+        },
+        "pip": {
+            "hashes": [
+                "sha256:deaf32dcd9ab821e359cd8330786bcd077604b5c5730c0b096eda46f95c24a2d",
+                "sha256:fd11ba3d0fdb4c07fbc5ecbba0b1b719809420f25038f8ee3cd913d3faa3033a"
             ],
-            "version": "==0.8.2"
+            "markers": "python_version >= '3.6'",
+            "version": "==21.3.1"
         },
         "pip-shims": {
             "hashes": [
-                "sha256:39193b8c4aa5e4cb82e250be58df4d5eaebe931a33b0df43b369f4ae92ee5753",
-                "sha256:423978c27d0e24e8ecb3e82b4a6c1f607e2e364153e73d0803c671d48b23195e"
+                "sha256:b6704551be47f9a7b05cbdb51a180b6d68be4c980c255e22d6a6dec7feb8f087",
+                "sha256:c0818a7a9bb49c1184324b2114432c3270ca31d4c5c3b0156ce8bf1826fc155b"
             ],
-            "version": "==0.5.2"
+            "markers": "python_version >= '3.6'",
+            "version": "==0.6.0"
         },
         "pipfile": {
             "hashes": [
@@ -176,84 +181,118 @@
                 "sha256:46402c03e36d6eadddad2a5125990e322dd74f98160c8f2dcd832b2291858a26",
                 "sha256:d6c9b96981b347bddd333910b753b6091a2c1eb2ef85bb373b4a67c9d91dca16"
             ],
+            "markers": "python_version >= '2.6' and python_version not in '3.0, 3.1, 3.2, 3.3'",
             "version": "==0.2.3"
         },
-        "pycodestyle": {
-            "hashes": [
-                "sha256:2295e7b2f6b5bd100585ebcb1f616591b652db8a741695b3d8f5d28bdc934367",
-                "sha256:c58a7d2815e0e8d7972bf1803331fb0152f867bd89adf8a01dfd55085434192e"
-            ],
-            "version": "==2.6.0"
-        },
         "pyparsing": {
             "hashes": [
                 "sha256:c203ec8783bf771a155b207279b9bccb8dea02d8f0c9e5f8ead507bc3246ecc1",
                 "sha256:ef9d7589ef3c200abe66653d3f1ab1033c3c419ae9b9bdb1240a85b024efc88b"
             ],
+            "markers": "python_version >= '2.6' and python_version not in '3.0, 3.1, 3.2'",
             "version": "==2.4.7"
         },
         "python-dateutil": {
             "hashes": [
-                "sha256:73ebfe9dbf22e832286dafa60473e4cd239f8592f699aa5adaf10050e6e1823c",
-                "sha256:75bb3f31ea686f1197762692a9ee6a7550b59fc6ca3a1f4b5d7e32fb98e2da2a"
+                "sha256:0123cacc1627ae19ddf3c27a5de5bd67ee4586fbdd6440d9748f8abb483d3e86",
+                "sha256:961d03dc3453ebbc59dbdea9e4e11c5651520a876d0f4db161e8674aae935da9"
             ],
-            "version": "==2.8.1"
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2'",
+            "version": "==2.8.2"
         },
         "regex": {
             "hashes": [
-                "sha256:08997a37b221a3e27d68ffb601e45abfb0093d39ee770e4257bd2f5115e8cb0a",
-                "sha256:112e34adf95e45158c597feea65d06a8124898bdeac975c9087fe71b572bd938",
-                "sha256:1700419d8a18c26ff396b3b06ace315b5f2a6e780dad387e4c48717a12a22c29",
-                "sha256:2f6f211633ee8d3f7706953e9d3edc7ce63a1d6aad0be5dcee1ece127eea13ae",
-                "sha256:52e1b4bef02f4040b2fd547357a170fc1146e60ab310cdbdd098db86e929b387",
-                "sha256:55b4c25cbb3b29f8d5e63aeed27b49fa0f8476b0d4e1b3171d85db891938cc3a",
-                "sha256:5aaa5928b039ae440d775acea11d01e42ff26e1561c0ffcd3d805750973c6baf",
-                "sha256:654cb773b2792e50151f0e22be0f2b6e1c3a04c5328ff1d9d59c0398d37ef610",
-                "sha256:690f858d9a94d903cf5cada62ce069b5d93b313d7d05456dbcd99420856562d9",
-                "sha256:6ad8663c17db4c5ef438141f99e291c4d4edfeaacc0ce28b5bba2b0bf273d9b5",
-                "sha256:89cda1a5d3e33ec9e231ece7307afc101b5217523d55ef4dc7fb2abd6de71ba3",
-                "sha256:92d8a043a4241a710c1cf7593f5577fbb832cf6c3a00ff3fc1ff2052aff5dd89",
-                "sha256:95fa7726d073c87141f7bbfb04c284901f8328e2d430eeb71b8ffdd5742a5ded",
-                "sha256:97712e0d0af05febd8ab63d2ef0ab2d0cd9deddf4476f7aa153f76feef4b2754",
-                "sha256:b2ba0f78b3ef375114856cbdaa30559914d081c416b431f2437f83ce4f8b7f2f",
-                "sha256:bae83f2a56ab30d5353b47f9b2a33e4aac4de9401fb582b55c42b132a8ac3868",
-                "sha256:c78e66a922de1c95a208e4ec02e2e5cf0bb83a36ceececc10a72841e53fbf2bd",
-                "sha256:cf59bbf282b627130f5ba68b7fa3abdb96372b24b66bdf72a4920e8153fc7910",
-                "sha256:e3cdc9423808f7e1bb9c2e0bdb1c9dc37b0607b30d646ff6faf0d4e41ee8fee3",
-                "sha256:e9b64e609d37438f7d6e68c2546d2cb8062f3adb27e6336bc129b51be20773ac",
-                "sha256:fbff901c54c22425a5b809b914a3bfaf4b9570eee0e5ce8186ac71eb2025191c"
-            ],
-            "version": "==2020.6.8"
+                "sha256:05b7d6d7e64efe309972adab77fc2af8907bb93217ec60aa9fe12a0dad35874f",
+                "sha256:0617383e2fe465732af4509e61648b77cbe3aee68b6ac8c0b6fe934db90be5cc",
+                "sha256:07856afef5ffcc052e7eccf3213317fbb94e4a5cd8177a2caa69c980657b3cb4",
+                "sha256:162abfd74e88001d20cb73ceaffbfe601469923e875caf9118333b1a4aaafdc4",
+                "sha256:2207ae4f64ad3af399e2d30dde66f0b36ae5c3129b52885f1bffc2f05ec505c8",
+                "sha256:30ab804ea73972049b7a2a5c62d97687d69b5a60a67adca07eb73a0ddbc9e29f",
+                "sha256:3b5df18db1fccd66de15aa59c41e4f853b5df7550723d26aa6cb7f40e5d9da5a",
+                "sha256:3c5fb32cc6077abad3bbf0323067636d93307c9fa93e072771cf9a64d1c0f3ef",
+                "sha256:416c5f1a188c91e3eb41e9c8787288e707f7d2ebe66e0a6563af280d9b68478f",
+                "sha256:432bd15d40ed835a51617521d60d0125867f7b88acf653e4ed994a1f8e4995dc",
+                "sha256:4aaa4e0705ef2b73dd8e36eeb4c868f80f8393f5f4d855e94025ce7ad8525f50",
+                "sha256:537ca6a3586931b16a85ac38c08cc48f10fc870a5b25e51794c74df843e9966d",
+                "sha256:53db2c6be8a2710b359bfd3d3aa17ba38f8aa72a82309a12ae99d3c0c3dcd74d",
+                "sha256:5537f71b6d646f7f5f340562ec4c77b6e1c915f8baae822ea0b7e46c1f09b733",
+                "sha256:6650f16365f1924d6014d2ea770bde8555b4a39dc9576abb95e3cd1ff0263b36",
+                "sha256:666abff54e474d28ff42756d94544cdfd42e2ee97065857413b72e8a2d6a6345",
+                "sha256:68a067c11463de2a37157930d8b153005085e42bcb7ad9ca562d77ba7d1404e0",
+                "sha256:780b48456a0f0ba4d390e8b5f7c661fdd218934388cde1a974010a965e200e12",
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+                "sha256:fff55f3ce50a3ff63ec8e2a8d3dd924f1941b250b0aac3d3d42b687eeff07a8e"
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-                "sha256:fe75cc94a9443b9246fc7049224f75604b113c36acb93f87b80ed42c44cbb898"
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-            "version": "==2.24.0"
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4, 3.5'",
+            "version": "==2.26.0"
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-                "sha256:6acae5ba27c9a1a45d120d74e0b922b202e0c614591880ae060d06c1e77eff66"
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             ],
             "index": "pypi",
-            "version": "==1.5.11"
+            "version": "==1.6.1"
+        },
+        "setuptools": {
+            "hashes": [
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+                "sha256:dae6b934a965c8a59d6d230d3867ec408bb95e73bd538ff77e71fedf1eaca729"
+            ],
+            "markers": "python_version >= '3.6'",
+            "version": "==58.5.3"
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         "six": {
             "hashes": [
-                "sha256:30639c035cdb23534cd4aa2dd52c3bf48f06e5f4a941509c8bafd8ce11080259",
-                "sha256:8b74bedcbbbaca38ff6d7491d76f2b06b3592611af620f8426e82dddb04a5ced"
+                "sha256:1e61c37477a1626458e36f7b1d82aa5c9b094fa4802892072e49de9c60c4c926",
+                "sha256:8abb2f1d86890a2dfb989f9a77cfcfd3e47c2a354b01111771326f8aa26e0254"
             ],
             "index": "pypi",
-            "version": "==1.15.0"
+            "version": "==1.16.0"
         },
         "toml": {
             "hashes": [
-                "sha256:926b612be1e5ce0634a2ca03470f95169cf16f939018233a670519cb4ac58b0f",
-                "sha256:bda89d5935c2eac546d648028b9901107a595863cb36bae0c73ac804a9b4ce88"
+                "sha256:806143ae5bfb6a3c6e736a764057db0e6a0e05e338b5630894a5f779cabb4f9b",
+                "sha256:b3bda1d108d5dd99f4a20d24d9c348e91c4db7ab1b749200bded2f839ccbe68f"
             ],
-            "version": "==0.10.1"
+            "markers": "python_version >= '2.6' and python_version not in '3.0, 3.1, 3.2'",
+            "version": "==0.10.2"
         },
         "tomli": {
             "hashes": [
@@ -265,53 +304,35 @@
         },
         "tomlkit": {
             "hashes": [
-                "sha256:74f976908030ff164c0aa1edabe3bf83ea004b3daa5b0940b9c86a060c004e9a",
-                "sha256:e5d5f20809c2b09276a6c5d98fb0202325aee441a651db84ac12e0812ab7e569"
+                "sha256:173ad840fa5d2aac140528ca1933c29791b79a374a0861a80347f42ec9328117",
+                "sha256:d7a454f319a7e9bd2e249f239168729327e4dd2d27b17dc68be264ad1ce36754"
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-            "version": "==0.6.0"
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-                "sha256:8c8aaad94455178e3187ab22c8b01a3837f8ee50e09cf31f1ba129eb293ec30b",
-                "sha256:8ce678dbaf790dbdb3eba24056d5364fb45944f33553dd5869b7580cdbb83614",
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-                "sha256:c9e348e02e4d2b4a8b2eedb48210430658df6951fa484e59de33ff773fbd4b41",
-                "sha256:d205b1b46085271b4e15f670058ce182bd1199e56b317bf2ec004b6a44f911f6",
-                "sha256:d43943ef777f9a1c42bf4e552ba23ac77a6351de620aa9acf64ad54933ad4d34",
-                "sha256:d5d33e9e7af3b34a40dc05f498939f0ebf187f07c385fd58d591c533ad8562fe",
-                "sha256:fc0fea399acb12edbf8a628ba8d2312f583bdbdb3335635db062fa98cf71fca4",
-                "sha256:fe460b922ec15dd205595c9b5b99e2f056fd98ae8f9f56b888e7a17dc2b757e7"
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-            "version": "==1.4.1"
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+            "version": "==0.7.2"
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         "typing": {
             "hashes": [
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-                "sha256:f38d83c5a7a7086543a0f649564d661859c5146a85775ab90c0d2f93ffaa9714"
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-            "index": "pypi",
             "markers": "python_version < '3.7'",
-            "version": "==3.7.4.1"
+            "version": "==3.7.4.3"
+        },
+        "typing-extensions": {
+            "hashes": [
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+                "sha256:d8226d10bc02a29bcc81df19a26e56a9647f8b0a6d4a83924139f4a8b01f17b7",
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         "urllib3": {
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-                "sha256:88206b0eb87e6d677d424843ac5209e3fb9d0190d0ee169599165ec25e9d9115"
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-            "version": "==1.25.9"
+            "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": "==1.26.7"
         },
         "vistir": {
             "hashes": [
@@ -323,93 +344,74 @@
         },
         "wheel": {
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-                "sha256:8788e9155fe14f54164c1b9eb0a319d98ef02c160725587ad60f14ddc57b6f96",
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-                "sha256:c599e4d75c98f6798c509911d08a22e6c021d074469042177c8c86fb92eefd96"
+                "sha256:21014b2bd93c6d0034b6ba5d35e4eb284340e09d63c59aef6fc14b0f346146fd",
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-            "markers": "python_version < '3.8'",
-            "version": "==3.1.0"
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'",
+            "version": "==0.37.0"
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     "develop": {
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-                "sha256:a841dacd6b99318a741b166adb07e19ee71a274450e68237b4650ca1055ab128"
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-                "sha256:f7b7ce16570fe9965acd6d30101a28f62fb4a7f9e926b3bbc9b61f8b04247e72"
+                "sha256:149e90d6d8ac20db7a955ad60cf0e6881a3f20d37096140088356da6c716b0b1",
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-            "version": "==19.3.0"
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'",
+            "version": "==21.2.0"
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         "autopep8": {
             "hashes": [
-                "sha256:60fd8c4341bab59963dafd5d2a566e94f547e660b9b396f772afe67d8481dbf0"
+                "sha256:44f0932855039d2c15c4510d6df665e4730f2b8582704fa48f9c55bd3e17d979",
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-            "index": "pypi",
             "markers": "python_version < '3.6'",
-            "version": "==1.5.3"
+            "version": "==1.6.0"
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         "backports.entry-points-selectable": {
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-                "sha256:a6d9a871cde5e15b4c4a53e3d43ba890cc6861ec1332c9c2428c92f977192acc"
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             ],
             "markers": "python_version >= '2.7'",
-            "version": "==1.1.0"
+            "version": "==1.1.1"
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         "black": {
             "hashes": [
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-                "sha256:c2edb73a08e9e0e6f65a0e6af18b059b8b1cdd5bef997d7a0b181df93dc81539"
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             "index": "pypi",
             "markers": "python_version >= '3.6'",
-            "version": "==19.10b0"
+            "version": "==21.10b0"
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-                "sha256:3a026f1a54135677e7da5ce819b0c690f156f37976f3e30c5430740725203d7f",
-                "sha256:9217a59f14a5682da7c4b8829deadbfc194ac22e9908ccf7c8820234e80a1504"
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-            "version": "==1.5.1"
+            "version": "==1.5.2"
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         "cerberus": {
             "hashes": [
-                "sha256:302e6694f206dd85cb63f13fd5025b31ab6d38c99c50c6d769f8fa0b0f299589"
+                "sha256:d1b21b3954b2498d9a79edf16b3170a3ac1021df88d197dc2ce5928ba519237c"
             ],
-            "version": "==1.3.2"
+            "version": "==1.3.4"
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         "certifi": {
             "hashes": [
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-                "sha256:8fc0819f1f30ba15bdb34cceffb9ef04d99f420f68eb75d901e9560b8749fc41"
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             ],
-            "version": "==2020.6.20"
+            "version": "==2021.10.8"
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         "chardet": {
             "hashes": [
-                "sha256:84ab92ed1c4d4f16916e05906b6b75a6c0fb5db821cc65e70cbd64a3e2a5eaae",
-                "sha256:fc323ffcaeaed0e0a02bf4d117757b98aed530d9ed4531e3e15460124c106691"
+                "sha256:0d6f53a15db4120f2b08c94f11e7d93d2c911ee118b6b30a04ec3ee8310179fa",
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-            "version": "==3.0.4"
+            "index": "pypi",
+            "version": "==4.0.0"
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         "charset-normalizer": {
             "hashes": [
@@ -421,117 +423,141 @@
         },
         "click": {
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-                "sha256:d2b5255c7c6349bc1bd1e59e08cd12acbbd63ce649f2588755783aa94dfb6b1a",
-                "sha256:dacca89f4bfadd5de3d7489b7c8a566eee0d3676333fbb50030263894c38c0dc"
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-            "version": "==7.1.2"
+            "markers": "python_version >= '3.6'",
+            "version": "==8.0.3"
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         "colorama": {
             "hashes": [
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@@ -549,32 +575,41 @@
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@@ -603,52 +638,56 @@
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@@ -660,90 +699,129 @@
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@@ -755,76 +833,51 @@
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         "tox": {
             "hashes": [
-                "sha256:a0d36849e59ac4a28664e80951a634b0e920d88047ce3fa8fa7b45216e573f30",
-                "sha256:db12b48359ba2cbc8c8f7ab712706ee67d59f8f9e8e0c795dcc45349b8784e48"
+                "sha256:5e274227a53dc9ef856767c21867377ba395992549f02ce55eb549f9fb9a8d10",
+                "sha256:c30b57fa2477f1fb7c36aa1d83292d5c2336cd0018119e1b1c17340e2c2708ca"
             ],
             "index": "pypi",
-            "version": "==3.16.0"
-        },
-        "typed-ast": {
-            "hashes": [
-                "sha256:0666aa36131496aed8f7be0410ff974562ab7eeac11ef351def9ea6fa28f6355",
-                "sha256:0c2c07682d61a629b68433afb159376e24e5b2fd4641d35424e462169c0a7919",
-                "sha256:249862707802d40f7f29f6e1aad8d84b5aa9e44552d2cc17384b209f091276aa",
-                "sha256:24995c843eb0ad11a4527b026b4dde3da70e1f2d8806c99b7b4a7cf491612652",
-                "sha256:269151951236b0f9a6f04015a9004084a5ab0d5f19b57de779f908621e7d8b75",
-                "sha256:4083861b0aa07990b619bd7ddc365eb7fa4b817e99cf5f8d9cf21a42780f6e01",
-                "sha256:498b0f36cc7054c1fead3d7fc59d2150f4d5c6c56ba7fb150c013fbc683a8d2d",
-                "sha256:4e3e5da80ccbebfff202a67bf900d081906c358ccc3d5e3c8aea42fdfdfd51c1",
-                "sha256:6daac9731f172c2a22ade6ed0c00197ee7cc1221aa84cfdf9c31defeb059a907",
-                "sha256:715ff2f2df46121071622063fc7543d9b1fd19ebfc4f5c8895af64a77a8c852c",
-                "sha256:73d785a950fc82dd2a25897d525d003f6378d1cb23ab305578394694202a58c3",
-                "sha256:8c8aaad94455178e3187ab22c8b01a3837f8ee50e09cf31f1ba129eb293ec30b",
-                "sha256:8ce678dbaf790dbdb3eba24056d5364fb45944f33553dd5869b7580cdbb83614",
-                "sha256:aaee9905aee35ba5905cfb3c62f3e83b3bec7b39413f0a7f19be4e547ea01ebb",
-                "sha256:bcd3b13b56ea479b3650b82cabd6b5343a625b0ced5429e4ccad28a8973f301b",
-                "sha256:c9e348e02e4d2b4a8b2eedb48210430658df6951fa484e59de33ff773fbd4b41",
-                "sha256:d205b1b46085271b4e15f670058ce182bd1199e56b317bf2ec004b6a44f911f6",
-                "sha256:d43943ef777f9a1c42bf4e552ba23ac77a6351de620aa9acf64ad54933ad4d34",
-                "sha256:d5d33e9e7af3b34a40dc05f498939f0ebf187f07c385fd58d591c533ad8562fe",
-                "sha256:fc0fea399acb12edbf8a628ba8d2312f583bdbdb3335635db062fa98cf71fca4",
-                "sha256:fe460b922ec15dd205595c9b5b99e2f056fd98ae8f9f56b888e7a17dc2b757e7"
-            ],
-            "version": "==1.4.1"
+            "version": "==3.24.4"
         },
         "typing": {
             "hashes": [
-                "sha256:91dfe6f3f706ee8cc32d38edbbf304e9b7583fb37108fef38229617f8b3eba23",
-                "sha256:c8cabb5ab8945cd2f54917be357d134db9cc1eb039e59d1606dc1e60cb1d9d36",
-                "sha256:f38d83c5a7a7086543a0f649564d661859c5146a85775ab90c0d2f93ffaa9714"
+                "sha256:1187fb9c82fd670d10aa07bbb6cfcfe4bdda42d6fab8d5134f04e8c4d0b71cc9",
+                "sha256:283d868f5071ab9ad873e5e52268d611e851c870a2ba354193026f2dfb29d8b5"
             ],
-            "index": "pypi",
             "markers": "python_version < '3.7'",
-            "version": "==3.7.4.1"
+            "version": "==3.7.4.3"
         },
         "typing-extensions": {
             "hashes": [
-                "sha256:6e95524d8a547a91e08f404ae485bbb71962de46967e1b71a0cb89af24e761c5",
-                "sha256:79ee589a3caca649a9bfd2a8de4709837400dfa00b6cc81962a1e6a1815969ae",
-                "sha256:f8d2bd89d25bc39dabe7d23df520442fa1d8969b82544370e03d88b5a591c392"
+                "sha256:49f75d16ff11f1cd258e1b988ccff82a3ca5570217d7ad8c5f48205dd99a677e",
+                "sha256:d8226d10bc02a29bcc81df19a26e56a9647f8b0a6d4a83924139f4a8b01f17b7",
+                "sha256:f1d25edafde516b146ecd0613dabcc61409817af4766fbbcfb8d1ad4ec441a34"
             ],
-            "version": "==3.7.4.2"
+            "version": "==3.10.0.2"
         },
         "urllib3": {
             "hashes": [
-                "sha256:3018294ebefce6572a474f0604c2021e33b3fd8006ecd11d62107a5d2a963527",
-                "sha256:88206b0eb87e6d677d424843ac5209e3fb9d0190d0ee169599165ec25e9d9115"
+                "sha256:4987c65554f7a2dbf30c18fd48778ef124af6fab771a377103da0585e2336ece",
+                "sha256:c4fdf4019605b6e5423637e01bc9fe4daef873709a7973e195ceba0a62bbc844"
             ],
-            "version": "==1.25.9"
+            "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": "==1.26.7"
         },
         "virtualenv": {
             "hashes": [
-                "sha256:f332ba0b2dfbac9f6b1da9f11224f0036b05cdb4df23b228527c2a2d5504aeed",
-                "sha256:ffffcb3c78a671bb3d590ac3bc67c081ea2188befeeb058870cba13e7f82911b"
+                "sha256:4b02e52a624336eece99c96e3ab7111f469c24ba226a53ec474e8e787b365814",
+                "sha256:576d05b46eace16a9c348085f7d0dc8ef28713a2cabaa1cf0aea41e8f12c9218"
             ],
-            "version": "==20.0.25"
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'",
+            "version": "==20.10.0"
         },
         "vistir": {
             "hashes": [
@@ -834,27 +887,13 @@
             "index": "pypi",
             "version": "==0.5.2"
         },
-        "wcwidth": {
-            "hashes": [
-                "sha256:beb4802a9cebb9144e99086eff703a642a13d6a0052920003a230f3294bbe784",
-                "sha256:c4d647b99872929fdb7bdcaa4fbe7f01413ed3d98077df798530e5b04f116c83"
-            ],
-            "version": "==0.2.5"
-        },
         "wheel": {
             "hashes": [
-                "sha256:8788e9155fe14f54164c1b9eb0a319d98ef02c160725587ad60f14ddc57b6f96",
-                "sha256:df277cb51e61359aba502208d680f90c0493adec6f0e848af94948778aed386e"
-            ],
-            "version": "==0.34.2"
-        },
-        "zipp": {
-            "hashes": [
-                "sha256:aa36550ff0c0b7ef7fa639055d797116ee891440eac1a56f378e2d3179e0320b",
-                "sha256:c599e4d75c98f6798c509911d08a22e6c021d074469042177c8c86fb92eefd96"
+                "sha256:21014b2bd93c6d0034b6ba5d35e4eb284340e09d63c59aef6fc14b0f346146fd",
+                "sha256:e2ef7239991699e3355d54f8e968a21bb940a1dbf34a4d226741e64462516fad"
             ],
-            "markers": "python_version < '3.8'",
-            "version": "==3.1.0"
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'",
+            "version": "==0.37.0"
         }
     }
 }
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..b0471b7
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,3 @@
+[build-system]
+requires = ["setuptools", "wheel"]
+build-backend = "setuptools.build_meta:__legacy__"
\ No newline at end of file
diff --git a/setup.py b/setup.py
index fdee655..8b0d544 100644
--- a/setup.py
+++ b/setup.py
@@ -42,7 +42,7 @@
     # For a discussion on single-sourcing the version across setup.py and the
     # project code, see
     # https://packaging.python.org/en/latest/single_source_version.html
-    version="3.1.2",  # Required
+    version="3.1.1",  # Required
     # This is a one-line description or tagline of what your project does. This
     # corresponds to the "Summary" metadata field:
     # https://packaging.python.org/specifications/core-metadata/#summary
@@ -102,6 +102,7 @@
         "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
+        "Programming Language :: Python :: 3.9",
     ],
     # This field adds keywords for your project which will appear on the
     # project page. What does your project relate to?
@@ -136,26 +137,26 @@
     # https://packaging.python.org/en/latest/requirements.html
     extras_require={
         "dev": [
-            "pytest~=5.2; python_version >= '3.6'",
-            "pytest-mypy~=0.3; python_version >= '3.5'",
-            "pytest-cov~=2.7",
-            "pytest-datadir~=1.3",
-            "pytest-xdist~=1.29",
-            "tox~=3.14",
-            "autopep8~=1.4",
+            "pytest",
+            "pytest-mypy",
+            "pytest-cov",
+            "pytest-datadir",
+            "pytest-xdist",
+            "tox",
+            "autopep8",
         ]
     },
     install_requires=[
-        "pipfile~=0.0",
-        "black==19.10b0; python_version >= '3.6'",
-        "colorama~=0.4",
-        "packaging~=20.0",
-        "requirementslib~=1.5",
-        "vistir~=0.4",
-        "autopep8~=1.4; python_version < '3.6'",
-        "six~=1.12",
-        "typing~=3.7; python_version < '3.7'",
-        "chardet>=3.0.0,<=5.0.0",
+        "pipfile",
+        "black>=19.10b0; python_version >= '3.6'",
+        "colorama",
+        "packaging",
+        "requirementslib",
+        "vistir",
+        "autopep8; python_version < '3.6'",
+        "six",
+        "typing; python_version < '3.7'",
+        "chardet",
     ],  # Optional
     entry_points={
         "console_scripts": ["pipenv-setup=pipenv_setup.main:cmd"]
diff --git a/tox.ini b/tox.ini
index ac17654..d7c8e50 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py27, py35, py36, py37, py38
+envlist = py27, py35, py36, py37, py38, py39
 skip_missing_interpreters=true
 
 [testenv]