diff --git a/Pipfile b/Pipfile
index 8e20b8db..47b45bf7 100644
--- a/Pipfile
+++ b/Pipfile
@@ -7,20 +7,20 @@ name = "pypi"
 
 [packages]
 
-cython = "==0.28.5"
-pydocstyle = "==2.1.1"
+cython = "==0.29"
+pydocstyle = "==3.0.0"
 pylint = "==2.1.1"
 mypy-lang = "==0.5.0"
 coverage = "==4.5.1"
-pytest = "==3.7.4"
+pytest = "==3.10.0"
 pytest-pylint = "==0.12.3"
 pytest-mypy = "==0.3.2"
-pytest-cov = "==2.5.1"
+pytest-cov = "==2.6.0"
 pytest-runner = "==4.2"
-coveralls = "==1.5.0"
+coveralls = "==1.5.1"
 
 
 [dev-packages]
 
-sphinx = "==1.7.8"
+sphinx = "==1.8.1"
 ghp-import = "==0.5.5"
diff --git a/Pipfile.lock b/Pipfile.lock
index 1150ade1..ad56155a 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -36,10 +36,10 @@
         },
         "certifi": {
             "hashes": [
-                "sha256:456048c7e371c089d0a77a5212fb37a2c2dce1e24146e3b7e0261736aaeaa22a",
-                "sha256:376690d6f16d32f9d1fe8932551d80b23e9d393a8578c5633a2ed39a64861638"
+                "sha256:339dc09518b07e2fa7eda5450740925974815557727d6bd35d319c1524a04a4c",
+                "sha256:6d58c986d22b038c8c0df30d639f23a3e6d172a05c3583e766f4c0b785c0986a"
             ],
-            "version": "==2018.8.24"
+            "version": "==2018.10.15"
         },
         "chardet": {
             "hashes": [
@@ -91,43 +91,43 @@
         },
         "coveralls": {
             "hashes": [
-                "sha256:aec5a1f5e34224b9089664a1b62217732381c7de361b6ed1b3c394d7187b352a",
-                "sha256:9dee67e78ec17b36c52b778247762851c8e19a893c9a14e921a2fc37f05fac22"
+                "sha256:b2388747e2529fa4c669fb1e3e2756e4e07b6ee56c7d9fce05f35ccccc913aa0",
+                "sha256:ab638e88d38916a6cedbf80a9cd8992d5fa55c77ab755e262e00b36792b7cd6d"
             ],
-            "version": "==1.5.0"
+            "version": "==1.5.1"
         },
         "cython": {
             "hashes": [
-                "sha256:13c73e2ffa93a615851e03fad97591954d143b5b62361b9adef81f46a31cd8ef",
-                "sha256:9ec27681c5b1b457aacb1cbda5db04aa28b76da2af6e1e1fd15f233eafe6a0b0",
-                "sha256:13eab5a2835a84ff62db343035603044c908d2b3b6eec09d67fdf9970acf7ac9",
-                "sha256:022592d419fc754509d0e0461eb2958dbaa45fb60d51c8a61778c58994edbe36",
-                "sha256:ae4784f040a3313c8bd00c8d04934b7ade63dc59692d8f00a5235be8ed72a445",
-                "sha256:e22f21cf92a9f8f007a280e3b3462c886d9068132a6c698dec10ad6125e3ca1e",
-                "sha256:b2ba8310ebd3c0e0b884d5e95bbd99d467d6af922acd1e44fe4b819839b2150e",
-                "sha256:ef86de9299e4ab2ebb129fb84b886bf40b9aced9807c6d6d5f28b46fb905f82c",
-                "sha256:183b35a48f58862c4ec1e821f07bb7b1156c8c8559c85c32ae086f28947474eb",
-                "sha256:693a8619ef066ece055ed065a15cf440f9d3ebd1bca60e87ea19144833756433",
-                "sha256:87e57b5d730cfab225d95e7b23abbc0c6f77598bd66639e93c73ce8afbae6f38",
-                "sha256:07659f4c57582104d9486c071de512fbd7e087a3a630535298442cc0e20a3f5a",
-                "sha256:cdbb917e41220bd3812234dbe59d15391adbc2c5d91ae11a5273aab9e32ba7ec",
-                "sha256:32de8637f5e6c5a76667bc7c8fc644bd9314dc19af36db8ce30a0b92ada0f642",
-                "sha256:660eeb6870687fd3eda91e00ba4e72220545c254c8c4d967fd0c910f4fbb8cbc",
-                "sha256:9400e5db8383346b0694a3e794d8bded18a27b21123516dcdf4b79d7ec28e98b",
-                "sha256:ee7a9614d51fe16e32ca5befe72e0808baff481791728449d0b17c8b0fe29eb9",
-                "sha256:827d3a91b7a7c31ce69e5974496fd9a8ba28eb498b988affb66d0d30de11d934",
-                "sha256:ea5c16c48e561f4a6f6b8c24807494b77a79e156b8133521c400f22ca712101b",
-                "sha256:4172c183ef4fb2ace6a29cdf7fc9200c5a471a7f775ff691975b774bd9ed3ad2",
-                "sha256:c78ad0df75a9fc03ab28ca1b950c893a208c451a18f76796c3e25817d6994001",
-                "sha256:d2223a80c623e2a8e97953ab945dfaa9385750a494438dcb55562eb1ddd9565a",
-                "sha256:553956ec06ecbd731ef0c538eb28a5b46bedea7ab89b18237ff28b4b99d65eee",
-                "sha256:2f526b0887128bf20ab2acc905a975f62b5a04ab2f63ecbe5a30fc28285d0e0c",
-                "sha256:f3e4860f5458a9875caa3de65e255720c0ed2ce71f0bcdab02497b32104f9db8",
-                "sha256:759c799e9ef418f163b5412e295e14c0a48fe3b4dcba9ab8aab69e9f511cfefd",
-                "sha256:fc6c20a8ac22202a779ad4c59756647be0826993d2151a03c015e76d2368ae5f",
-                "sha256:b64575241f64f6ec005a4d4137339fb0ba5e156e826db2fdb5f458060d9979e0"
-            ],
-            "version": "==0.28.5"
+                "sha256:fceb8271bc2fd3477094ca157c824e8ea840a7b393e89e766eea9a3b9ce7e0c6",
+                "sha256:a3e5e5ca325527d312cdb12a4dab8b0459c458cad1c738c6f019d0d8d147081c",
+                "sha256:df428969154a9a4cd9748c7e6efd18432111fbea3d700f7376046c38c5e27081",
+                "sha256:acf10d1054de92af8d5bfc6620bb79b85f04c98214b4da7db77525bfa9fc2a89",
+                "sha256:339f5b985de3662b1d6c69991ab46fdbdc736feb4ac903ef6b8c00e14d87f4d8",
+                "sha256:48b919da89614d201e72fbd8247b5ae8881e296cf968feb5595a015a14c67f1f",
+                "sha256:de46ffb67e723975f5acab101c5235747af1e84fbbc89bf3533e2ea93fb26947",
+                "sha256:501b671b639b9ca17ad303f8807deb1d0ff754d1dab106f2607d14b53cb0ff0b",
+                "sha256:42c53786806e24569571a7a24ebe78ec6b364fe53e79a3f27eddd573cacd398f",
+                "sha256:49906e008eeb91912654a36c200566392bd448b87a529086694053a280f8af2d",
+                "sha256:019008a69e6b7c102f2ed3d733a288d1784363802b437dd2b91e6256b12746da",
+                "sha256:f7a43097d143bd7846ffba6d2d8cd1cc97f233318dbd0f50a235ea01297a096b",
+                "sha256:1441fe19c56c90b8c2159d7b861c31a134d543ef7886fd82a5d267f9f11f35ac",
+                "sha256:5574574142364804423ab4428bd331a05c65f7ecfd31ac97c936f0c720fe6a53",
+                "sha256:1d1a5e9d6ed415e75a676b72200ad67082242ec4d2d76eb7446da255ae72d3f7",
+                "sha256:7dcf2ad14e25b05eda8bdd104f8c03a642a384aeefd25a5b51deac0826e646fa",
+                "sha256:8ca3a99f5a7443a6a8f83a5d8fcc11854b44e6907e92ba8640d8a8f7b9085e21",
+                "sha256:6092239a772b3c6604be9e94b9ab4f0dacb7452e8ad299fd97eae0611355b679",
+                "sha256:3d0afba0aec878639608f013045697fb0969ff60b3aea2daec771ea8d01ad112",
+                "sha256:927da3b5710fb705aab173ad630b45a4a04c78e63dcd89411a065b2fe60e4770",
+                "sha256:f5ebf24b599caf466f9da8c4115398d663b2567b89e92f58a835e9da4f74669f",
+                "sha256:a7716a98f0b9b8f61ddb2bae7997daf546ac8fc594be6ba397f4bde7d76bfc62",
+                "sha256:49fc01a7c9c4e3c1784e9a15d162c2cac3990fcc28728227a6f8f0837aabda7c",
+                "sha256:ff919ceb40259f5332db43803aa6c22ff487e86036ce3921ae04b9185efc99a4",
+                "sha256:f79e45d5c122c4fb1fd54029bf1d475cecc05f4ed5b68136b0d6ec268bae68b6",
+                "sha256:71ff5c7632501c4f60edb8a24fd0a772e04c5bdca2856d978d04271b63666ef7",
+                "sha256:35bdf3f48535891fee2eaade70e91d5b2cc1ee9fc2a551847c7ec18bce55a92c",
+                "sha256:94916d1ede67682638d3cc0feb10648ff14dc51fb7a7f147f4fedce78eaaea97"
+            ],
+            "version": "==0.29"
         },
         "docopt": {
             "hashes": [
@@ -193,10 +193,10 @@
         },
         "mypy": {
             "hashes": [
-                "sha256:673ea75fb750289b7d1da1331c125dc62fc1c3a8db9129bb372ae7b7d5bf300a",
-                "sha256:c770605a579fdd4a014e9f0a34b6c7a36ce69b08100ff728e96e27445cef3b3c"
+                "sha256:fb90c804b84cfd8133d3ddfbd630252694d11ccc1eb0166a1b2efb5da37ecab2",
+                "sha256:8e071ec32cc226e948a34bbb3d196eb0fd96f3ac69b6843a5aff9bd4efa14455"
             ],
-            "version": "==0.620"
+            "version": "==0.641"
         },
         "mypy-lang": {
             "hashes": [
@@ -206,32 +206,32 @@
         },
         "psutil": {
             "hashes": [
-                "sha256:b34611280a2d0697f1c499e15e936d88109170194b390599c98bab8072a71f05",
-                "sha256:a890c3e490493f21da2817ffc92822693bc0d6bcac9999caa04ffce8dd4e7132",
-                "sha256:1914bacbd2fc2af8f795daa44b9d2e0649a147460cfd21b1a70a124472f66d40",
-                "sha256:d081707ef0081920533db30200a2d30d5c0ea9cf6afa7cf8881ae4516cc69c48",
-                "sha256:0d8da7333549a998556c18eb2af3ce902c28d66ceb947505c008f91e9f988abd",
-                "sha256:cea2557ee6a9faa2c100947637ded68414e12b851633c4ce26e0311b2a2ed539",
-                "sha256:215d61a901e67b1a35e14c6aedef317f7fa7e6075a20c150fd11bd2c906d2c83",
-                "sha256:51057c03aea251ad6667c2bba259bc7ed3210222d3a74152c84e3ab06e1da0ba",
-                "sha256:5b6322b167a5ba0c5463b4d30dfd379cd4ce245a1162ebf8fc7ab5c5ffae4f3b"
+                "sha256:809c9cef0402e3e48b5a1dddc390a8a6ff58b15362ea5714494073fa46c3d293",
+                "sha256:3b7a4daf4223dae171a67a89314ac5ca0738e94064a78d99cfd751c55d05f315",
+                "sha256:bbffac64cfd01c6bcf90eb1bedc6c80501c4dae8aef4ad6d6dd49f8f05f6fc5a",
+                "sha256:b4d1b735bf5b120813f4c89db8ac22d89162c558cbd7fdd298866125fe906219",
+                "sha256:3e19be3441134445347af3767fa7770137d472a484070840eee6653b94ac5576",
+                "sha256:1c19957883e0b93d081d41687089ad630e370e26dc49fd9df6951d6c891c4736",
+                "sha256:bfcea4f189177b2d2ce4a34b03c4ac32c5b4c22e21f5b093d9d315e6e253cd81",
+                "sha256:1c71b9716790e202a00ab0931a6d1e25db1aa1198bcacaea2f5329f75d257fff",
+                "sha256:6e265c8f3da00b015d24b842bfeb111f856b13d24f2c57036582568dc650d6c3"
             ],
-            "version": "==5.4.7"
+            "version": "==5.4.8"
         },
         "py": {
             "hashes": [
-                "sha256:50402e9d1c9005d759426988a492e0edaadb7f4e68bcddfea586bc7432d009c6",
-                "sha256:06a30435d058473046be836d3fc4f27167fd84c45b99704f2fb5509ef61f9af1"
+                "sha256:e76826342cefe3c3d5f7e8ee4316b80d1dd8a300781612ddbc765c17ba25a6c6",
+                "sha256:bf92637198836372b520efcba9e020c330123be8ce527e535d185ed4b6f45694"
             ],
-            "version": "==1.6.0"
+            "version": "==1.7.0"
         },
         "pydocstyle": {
             "hashes": [
-                "sha256:08a870edc94508264ed90510db466c6357c7192e0e866561d740624a8fc7d90c",
-                "sha256:af9fcccb303899b83bec82dc9a1d56c60fc369973223a5e80c3dfa9bdf984405",
-                "sha256:4d5bcde961107873bae621f3d580c3e35a426d3687ffc6f8fb356f6628da5a97"
+                "sha256:2258f9b0df68b97bf3a6c29003edc5238ff8879f1efb6f1999988d934e432bd8",
+                "sha256:ed79d4ec5e92655eccc21eb0c6cf512e69512b4a97d215ace46d17e4990f2039",
+                "sha256:5741c85e408f9e0ddf873611085e819b809fca90b619f5fd7f34bd4959da3dd4"
             ],
-            "version": "==2.1.1"
+            "version": "==3.0.0"
         },
         "pylint": {
             "hashes": [
@@ -242,17 +242,17 @@
         },
         "pytest": {
             "hashes": [
-                "sha256:ad0c7db7b5d4081631e0155f5c61b80ad76ce148551aaafe3a718d65a7508b18",
-                "sha256:2d7c49e931316cc7d1638a3e5f54f5d7b4e5225972b3c9838f3584788d27f349"
+                "sha256:630ff1dbe04f469ee78faa5660f712e58b953da7df22ea5d828c9012e134da43",
+                "sha256:a2b5232735dd0b736cbea9c0f09e5070d78fcaba2823a4f6f09d9a81bd19415c"
             ],
-            "version": "==3.7.4"
+            "version": "==3.10.0"
         },
         "pytest-cov": {
             "hashes": [
-                "sha256:890fe5565400902b0c78b5357004aab1c814115894f4f21370e2433256a3eeec",
-                "sha256:03aa752cf11db41d281ea1d807d954c4eda35cfa1b21d6971966cc041bbf6e2d"
+                "sha256:513c425e931a0344944f84ea47f3956be0e416d95acbd897a44970c8d926d5d7",
+                "sha256:e360f048b7dae3f2f2a9a4d067b2dd6b6a015d384d1577c994a43f3f7cbad762"
             ],
-            "version": "==2.5.1"
+            "version": "==2.6.0"
         },
         "pytest-mypy": {
             "hashes": [
@@ -278,10 +278,10 @@
         },
         "requests": {
             "hashes": [
-                "sha256:63b52e3c866428a224f97cab011de738c36aec0185aa91cfacd418b5d58911d1",
-                "sha256:ec22d826a36ed72a7358ff3fe56cbd4ba69dd7a6718ffd450ff0e9df7a47ce6a"
+                "sha256:a84b8c9ab6239b578f22d1c21d51b696dcfe004032bb80ea832398d6909d7279",
+                "sha256:99dcfdaaeb17caf6e526f32b6a7b780461512ab3f1d992187801694cba42770c"
             ],
-            "version": "==2.19.1"
+            "version": "==2.20.0"
         },
         "six": {
             "hashes": [
@@ -322,10 +322,10 @@
         },
         "urllib3": {
             "hashes": [
-                "sha256:06330f386d6e4b195fbfc736b297f58c5a892e4440e54d294d7004e3a9bbea1b",
-                "sha256:cc44da8e1145637334317feebd728bd869a35285b93cbb4cca2577da7e62db4f"
+                "sha256:61bf29cada3fc2fbefad4fdf059ea4bd1b4a86d2b6d15e1c7c0b582b9752fe39",
+                "sha256:de9529817c93f27c8ccbfead6985011db27bd0ddfcdb2d86f3f663385c6a9c22"
             ],
-            "version": "==1.22"
+            "version": "==1.24.1"
         },
         "wrapt": {
             "hashes": [
@@ -337,10 +337,10 @@
     "develop": {
         "alabaster": {
             "hashes": [
-                "sha256:674bb3bab080f598371f4443c5008cbfeb1a5e622dd312395d2d82af2c54c456",
-                "sha256:b63b1f4dc77c074d386752ec4a8a7517600f6c0db8cd42980cae17ab7b3275d7"
+                "sha256:446438bdcca0e05bd45ea2de1668c1d9b032e1a9154c2c259092d77031ddd359",
+                "sha256:a661d72d58e6ea8a57f7a86e37d86716863ee5e92788398526d58b26a4e4dc02"
             ],
-            "version": "==0.7.11"
+            "version": "==0.7.12"
         },
         "babel": {
             "hashes": [
@@ -351,10 +351,10 @@
         },
         "certifi": {
             "hashes": [
-                "sha256:456048c7e371c089d0a77a5212fb37a2c2dce1e24146e3b7e0261736aaeaa22a",
-                "sha256:376690d6f16d32f9d1fe8932551d80b23e9d393a8578c5633a2ed39a64861638"
+                "sha256:339dc09518b07e2fa7eda5450740925974815557727d6bd35d319c1524a04a4c",
+                "sha256:6d58c986d22b038c8c0df30d639f23a3e6d172a05c3583e766f4c0b785c0986a"
             ],
-            "version": "==2018.8.24"
+            "version": "==2018.10.15"
         },
         "chardet": {
             "hashes": [
@@ -400,9 +400,36 @@
         },
         "markupsafe": {
             "hashes": [
-                "sha256:a6be69091dac236ea9c6bc7d012beab42010fa914c459791d627dad4910eb665"
+                "sha256:efdc45ef1afc238db84cb4963aa689c0408912a0239b0721cb172b4016eb31d6",
+                "sha256:52ccb45e77a1085ec5461cde794e1aa037df79f473cbc69b974e73940655c8d7",
+                "sha256:525396ee324ee2da82919f2ee9c9e73b012f23e7640131dd1b53a90206a0f09c",
+                "sha256:5c3fbebd7de20ce93103cb3183b47671f2885307df4a17a0ad56a1dd51273d36",
+                "sha256:f82e347a72f955b7017a39708a3667f106e6ad4d10b25f237396a7115d8ed5fd",
+                "sha256:31cbb1359e8c25f9f48e156e59e2eaad51cd5242c05ed18a8de6dbe85184e4b7",
+                "sha256:edce2ea7f3dfc981c4ddc97add8a61381d9642dc3273737e756517cc03e84dd6",
+                "sha256:19f637c2ac5ae9da8bfd98cef74d64b7e1bb8a63038a3505cd182c3fac5eb4d9",
+                "sha256:98e439297f78fca3a6169fd330fbe88d78b3bb72f967ad9961bcac0d7fdd1550",
+                "sha256:fb7c206e01ad85ce57feeaaa0bf784b97fa3cad0d4a5737bc5295785f5c613a1",
+                "sha256:1fa6058938190ebe8290e5cae6c351e14e7bb44505c4a7624555ce57fbbeba0d",
+                "sha256:e982fe07ede9fada6ff6705af70514a52beb1b2c3d25d4e873e82114cf3c5401",
+                "sha256:5e5851969aea17660e55f6a3be00037a25b96a9b44d2083651812c99d53b14d1",
+                "sha256:f137c02498f8b935892d5c0172560d7ab54bc45039de8805075e19079c639a9c",
+                "sha256:3e835d8841ae7863f64e40e19477f7eb398674da6a47f09871673742531e6f4b",
+                "sha256:5edfa27b2d3eefa2210fb2f5d539fbed81722b49f083b2c6566455eb7422fd7e",
+                "sha256:857eebb2c1dc60e4219ec8e98dfa19553dae33608237e107db9c6078b1167856",
+                "sha256:bf54103892a83c64db58125b3f2a43df6d2cb2d28889f14c78519394feb41492",
+                "sha256:048ef924c1623740e70204aa7143ec592504045ae4429b59c30054cb31e3c432",
+                "sha256:83381342bfc22b3c8c06f2dd93a505413888694302de25add756254beee8449c",
+                "sha256:130f844e7f5bdd8e9f3f42e7102ef1d49b2e6fdf0d7526df3f87281a532d8c8b",
+                "sha256:52b07fbc32032c21ad4ab060fec137b76eb804c4b9a1c7c7dc562549306afad2",
+                "sha256:1f19ef5d3908110e1e891deefb5586aae1b49a7440db952454b4e281b41620cd",
+                "sha256:1b8a7a87ad1b92bd887568ce54b23565f3fd7018c4180136e1cf412b405a47af",
+                "sha256:d9ac82be533394d341b41d78aca7ed0e0f4ba5a2231602e2f05aa87f25c51672",
+                "sha256:1c25694ca680b6919de53a4bb3bdd0602beafc63ff001fea2f2fc16ec3a11834",
+                "sha256:7d263e5770efddf465a9e31b78362d84d015cc894ca2c131901a4445eaa61ee1",
+                "sha256:4e97332c9ce444b0c2c38dd22ddc61c743eb208d916e4265a2a3b575bdccb1d3"
             ],
-            "version": "==1.0"
+            "version": "==1.1.0"
         },
         "pygments": {
             "hashes": [
@@ -413,17 +440,17 @@
         },
         "pytz": {
             "hashes": [
-                "sha256:a061aa0a9e06881eb8b3b2b43f05b9439d6583c206d0a6c340ff72a7b6669053",
-                "sha256:ffb9ef1de172603304d9d2819af6f5ece76f2e85ec10692a524dd876e72bf277"
+                "sha256:8e0f8568c118d3077b46be7d654cc8167fa916092e28320cde048e54bfc9f1e6",
+                "sha256:31cb35c89bd7d333cd32c5f278fca91b523b0834369e757f4c5641ea252236ca"
             ],
-            "version": "==2018.5"
+            "version": "==2018.7"
         },
         "requests": {
             "hashes": [
-                "sha256:63b52e3c866428a224f97cab011de738c36aec0185aa91cfacd418b5d58911d1",
-                "sha256:ec22d826a36ed72a7358ff3fe56cbd4ba69dd7a6718ffd450ff0e9df7a47ce6a"
+                "sha256:a84b8c9ab6239b578f22d1c21d51b696dcfe004032bb80ea832398d6909d7279",
+                "sha256:99dcfdaaeb17caf6e526f32b6a7b780461512ab3f1d992187801694cba42770c"
             ],
-            "version": "==2.19.1"
+            "version": "==2.20.0"
         },
         "six": {
             "hashes": [
@@ -441,10 +468,10 @@
         },
         "sphinx": {
             "hashes": [
-                "sha256:d719de667218d763e8fd144b7fcfeefd8d434a6201f76bf9f0f0c1fa6f47fcdb",
-                "sha256:a07050845cc9a2f4026a6035cc8ed795a5ce7be6528bbc82032385c10807dfe7"
+                "sha256:d222626d8356de702431e813a05c68a35967e3d66c6cd1c2c89539bb179a7464",
+                "sha256:652eb8c566f18823a022bb4b6dbc868d366df332a11a0226b5bc3a798a479f17"
             ],
-            "version": "==1.7.8"
+            "version": "==1.8.1"
         },
         "sphinxcontrib-websupport": {
             "hashes": [
@@ -455,10 +482,10 @@
         },
         "urllib3": {
             "hashes": [
-                "sha256:06330f386d6e4b195fbfc736b297f58c5a892e4440e54d294d7004e3a9bbea1b",
-                "sha256:cc44da8e1145637334317feebd728bd869a35285b93cbb4cca2577da7e62db4f"
+                "sha256:61bf29cada3fc2fbefad4fdf059ea4bd1b4a86d2b6d15e1c7c0b582b9752fe39",
+                "sha256:de9529817c93f27c8ccbfead6985011db27bd0ddfcdb2d86f3f663385c6a9c22"
             ],
-            "version": "==1.22"
+            "version": "==1.24.1"
         }
     }
 }
diff --git a/requirements-docs.txt b/requirements-docs.txt
index 6b94d118..93085789 100644
--- a/requirements-docs.txt
+++ b/requirements-docs.txt
@@ -1,2 +1,2 @@
-sphinx==1.7.8
+sphinx==1.8.1
 ghp-import==0.5.5
diff --git a/requirements.txt b/requirements.txt
index 890a65f0..30818208 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,23 +1,23 @@
 # pip
 # wheel
 
-cython==0.28.5
+cython==0.29
 
 # key components for improving Python project
 # we will install them on "Testing" section
 # but let's lock version here and use bot to trigger each version update
-pydocstyle==2.1.1
+pydocstyle==3.0.0
 pylint==2.1.1
 # flake8==3.4.1
 mypy-lang==0.5.0
 coverage==4.5.1
 
 # Testing
-pytest==3.7.4
+pytest==3.10.0
 # pytest-flake8==0.8.1  # pytest plugin of flake8
 pytest-pylint==0.12.3    # pytest plugin of pylint
 pytest-mypy==0.3.2      # pytest plugin of mypy
-pytest-cov==2.5.1       # testing coverage
+pytest-cov==2.6.0       # testing coverage
 pytest-runner==4.2   # add setup.py test support for pytest
 
-coveralls==1.5.0
+coveralls==1.5.1