diff --git a/.gitignore b/.gitignore
index c77d2c54..c34db5d4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -20,3 +20,4 @@ VENV/
 *.out
 *.diff
 htmlcov/
+.mypy_cache/
diff --git a/Makefile b/Makefile
index 9a7dd1bf..aa013d46 100644
--- a/Makefile
+++ b/Makefile
@@ -114,6 +114,9 @@ clean_local_testnets:
 	docker-compose -f ./local_test_nodes/docker-compose.yml down
 	rm -fr ./local_test_nodes/*/data
 
+mypy:
+	mypy -p aergo -p tests
+
 ex: ## run all examples in the examples directory
 	pip show aergo-herapy
 	@echo "===============================" > make.ex.out
diff --git a/Pipfile b/Pipfile
index 5cd5ea25..3123c661 100644
--- a/Pipfile
+++ b/Pipfile
@@ -26,6 +26,7 @@ twine = "*"
 Sphinx = "*"
 sphinx_rtd_theme = "*"
 urllib3 = ">=1.24.3"
+mypy = "*"
 
 [requires]
 python_version = "3.7"
diff --git a/Pipfile.lock b/Pipfile.lock
index e9996a0a..22541408 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "1d3e4bfde72ef30453b6373c58b2e3ef06752b99aa6512105d70b714e81f148d"
+            "sha256": "d71372bf3ec060d453a9f3e39acfbad984505a086441e1d0cf4c3e45cee29075"
         },
         "pipfile-spec": 6,
         "requires": {
@@ -18,49 +18,44 @@
     "default": {
         "base58": {
             "hashes": [
-                "sha256:1e42993c0628ed4f898c03b522b26af78fb05115732549b21a028bc4633d19ab",
-                "sha256:6aa0553e477478993588303c54659d15e3c17ae062508c854a8b752d07c716bd",
-                "sha256:9a793c599979c497800eb414c852b80866f28daaed5494703fc129592cc83e60"
+                "sha256:4c7f5687da771b519cf86b3236250e7c3543368c576404c9fe2d992a287666e0",
+                "sha256:c83584a8b917dc52dd634307137f2ad2721a9efb4f1de32fc7eaaaf87844177e"
             ],
             "index": "pypi",
-            "version": "==1.0.3"
+            "version": "==2.0.0"
         },
         "cffi": {
             "hashes": [
-                "sha256:00d890313797d9fe4420506613384b43099ad7d2b905c0752dbcc3a6f14d80fa",
-                "sha256:0cf9e550ac6c5e57b713437e2f4ac2d7fd0cd10336525a27224f5fc1ec2ee59a",
-                "sha256:0ea23c9c0cdd6778146a50d867d6405693ac3b80a68829966c98dd5e1bbae400",
-                "sha256:193697c2918ecdb3865acf6557cddf5076bb39f1f654975e087b67efdff83365",
-                "sha256:1ae14b542bf3b35e5229439c35653d2ef7d8316c1fffb980f9b7647e544baa98",
-                "sha256:1e389e069450609c6ffa37f21f40cce36f9be7643bbe5051ab1de99d5a779526",
-                "sha256:263242b6ace7f9cd4ea401428d2d45066b49a700852334fd55311bde36dcda14",
-                "sha256:33142ae9807665fa6511cfa9857132b2c3ee6ddffb012b3f0933fc11e1e830d5",
-                "sha256:364f8404034ae1b232335d8c7f7b57deac566f148f7222cef78cf8ae28ef764e",
-                "sha256:47368f69fe6529f8f49a5d146ddee713fc9057e31d61e8b6dc86a6a5e38cecc1",
-                "sha256:4895640844f17bec32943995dc8c96989226974dfeb9dd121cc45d36e0d0c434",
-                "sha256:558b3afef987cf4b17abd849e7bedf64ee12b28175d564d05b628a0f9355599b",
-                "sha256:5ba86e1d80d458b338bda676fd9f9d68cb4e7a03819632969cf6d46b01a26730",
-                "sha256:63424daa6955e6b4c70dc2755897f5be1d719eabe71b2625948b222775ed5c43",
-                "sha256:6381a7d8b1ebd0bc27c3bc85bc1bfadbb6e6f756b4d4db0aa1425c3719ba26b4",
-                "sha256:6381ab708158c4e1639da1f2a7679a9bbe3e5a776fc6d1fd808076f0e3145331",
-                "sha256:6fd58366747debfa5e6163ada468a90788411f10c92597d3b0a912d07e580c36",
-                "sha256:728ec653964655d65408949b07f9b2219df78badd601d6c49e28d604efe40599",
-                "sha256:7cfcfda59ef1f95b9f729c56fe8a4041899f96b72685d36ef16a3440a0f85da8",
-                "sha256:819f8d5197c2684524637f940445c06e003c4a541f9983fd30d6deaa2a5487d8",
-                "sha256:825ecffd9574557590e3225560a8a9d751f6ffe4a49e3c40918c9969b93395fa",
-                "sha256:8a2bcae2258d00fcfc96a9bde4a6177bc4274fe033f79311c5dd3d3148c26518",
-                "sha256:9009e917d8f5ef780c2626e29b6bc126f4cb2a4d43ca67aa2b40f2a5d6385e78",
-                "sha256:9c77564a51d4d914ed5af096cd9843d90c45b784b511723bd46a8a9d09cf16fc",
-                "sha256:a19089fa74ed19c4fe96502a291cfdb89223a9705b1d73b3005df4256976142e",
-                "sha256:a40ed527bffa2b7ebe07acc5a3f782da072e262ca994b4f2085100b5a444bbb2",
-                "sha256:b8f09f21544b9899defb09afbdaeb200e6a87a2b8e604892940044cf94444644",
-                "sha256:bb75ba21d5716abc41af16eac1145ab2e471deedde1f22c6f99bd9f995504df0",
-                "sha256:e22a00c0c81ffcecaf07c2bfb3672fa372c50e2bd1024ffee0da191c1b27fc71",
-                "sha256:e55b5a746fb77f10c83e8af081979351722f6ea48facea79d470b3731c7b2891",
-                "sha256:ec2fa3ee81707a5232bf2dfbd6623fdb278e070d596effc7e2d788f2ada71a05",
-                "sha256:fd82eb4694be712fcae03c717ca2e0fc720657ac226b80bbb597e971fc6928c2"
-            ],
-            "version": "==1.13.1"
+                "sha256:001bf3242a1bb04d985d63e138230802c6c8d4db3668fb545fb5005ddf5bb5ff",
+                "sha256:00789914be39dffba161cfc5be31b55775de5ba2235fe49aa28c148236c4e06b",
+                "sha256:028a579fc9aed3af38f4892bdcc7390508adabc30c6af4a6e4f611b0c680e6ac",
+                "sha256:14491a910663bf9f13ddf2bc8f60562d6bc5315c1f09c704937ef17293fb85b0",
+                "sha256:1cae98a7054b5c9391eb3249b86e0e99ab1e02bb0cc0575da191aedadbdf4384",
+                "sha256:2089ed025da3919d2e75a4d963d008330c96751127dd6f73c8dc0c65041b4c26",
+                "sha256:2d384f4a127a15ba701207f7639d94106693b6cd64173d6c8988e2c25f3ac2b6",
+                "sha256:337d448e5a725bba2d8293c48d9353fc68d0e9e4088d62a9571def317797522b",
+                "sha256:399aed636c7d3749bbed55bc907c3288cb43c65c4389964ad5ff849b6370603e",
+                "sha256:3b911c2dbd4f423b4c4fcca138cadde747abdb20d196c4a48708b8a2d32b16dd",
+                "sha256:3d311bcc4a41408cf5854f06ef2c5cab88f9fded37a3b95936c9879c1640d4c2",
+                "sha256:62ae9af2d069ea2698bf536dcfe1e4eed9090211dbaafeeedf5cb6c41b352f66",
+                "sha256:66e41db66b47d0d8672d8ed2708ba91b2f2524ece3dee48b5dfb36be8c2f21dc",
+                "sha256:675686925a9fb403edba0114db74e741d8181683dcf216be697d208857e04ca8",
+                "sha256:7e63cbcf2429a8dbfe48dcc2322d5f2220b77b2e17b7ba023d6166d84655da55",
+                "sha256:8a6c688fefb4e1cd56feb6c511984a6c4f7ec7d2a1ff31a10254f3c817054ae4",
+                "sha256:8c0ffc886aea5df6a1762d0019e9cb05f825d0eec1f520c51be9d198701daee5",
+                "sha256:95cd16d3dee553f882540c1ffe331d085c9e629499ceadfbda4d4fde635f4b7d",
+                "sha256:99f748a7e71ff382613b4e1acc0ac83bf7ad167fb3802e35e90d9763daba4d78",
+                "sha256:b8c78301cefcf5fd914aad35d3c04c2b21ce8629b5e4f4e45ae6812e461910fa",
+                "sha256:c420917b188a5582a56d8b93bdd8e0f6eca08c84ff623a4c16e809152cd35793",
+                "sha256:c43866529f2f06fe0edc6246eb4faa34f03fe88b64a0a9a942561c8e22f4b71f",
+                "sha256:cab50b8c2250b46fe738c77dbd25ce017d5e6fb35d3407606e7a4180656a5a6a",
+                "sha256:cef128cb4d5e0b3493f058f10ce32365972c554572ff821e175dbc6f8ff6924f",
+                "sha256:cf16e3cf6c0a5fdd9bc10c21687e19d29ad1fe863372b5543deaec1039581a30",
+                "sha256:e56c744aa6ff427a607763346e4170629caf7e48ead6921745986db3692f987f",
+                "sha256:e577934fc5f8779c554639376beeaa5657d54349096ef24abe8c74c5d9c117c3",
+                "sha256:f2b0fa0c01d8a0c7483afd9f31d7ecf2d71760ca24499c8697aeb5ca37dc090c"
+            ],
+            "version": "==1.14.0"
         },
         "cryptography": {
             "hashes": [
@@ -91,94 +86,91 @@
         },
         "ecdsa": {
             "hashes": [
-                "sha256:163c80b064a763ea733870feb96f9dd9b92216cfcacd374837af18e4e8ec3d4d",
-                "sha256:9814e700890991abeceeb2242586024d4758c8fc18445b194a49bd62d85861db"
+                "sha256:867ec9cf6df0b03addc8ef66b56359643cb5d0c1dc329df76ba7ecfe256c8061",
+                "sha256:8f12ac317f8a1318efa75757ef0a651abe12e51fc1af8838fb91079445227277"
             ],
             "index": "pypi",
-            "version": "==0.13.3"
+            "version": "==0.15"
         },
         "googleapis-common-protos": {
             "hashes": [
-                "sha256:e61b8ed5e36b976b487c6e7b15f31bb10c7a0ca7bd5c0e837f4afab64b53a0c6"
+                "sha256:013c91704279119150e44ef770086fdbba158c1f978a6402167d47d5409e226e"
             ],
             "index": "pypi",
-            "version": "==1.6.0"
+            "version": "==1.51.0"
         },
         "grpcio": {
             "hashes": [
-                "sha256:01cb705eafba1108e2a947ba0457da4f6a1e8142c729fc61702b5fdd11009eb1",
-                "sha256:0b5a79e29f167d3cd06faad6b15babbc2661066daaacf79373c3a8e67ca1fca1",
-                "sha256:1097a61a0e97b3580642e6e1460a3a1f1ba1815e2a70d6057173bcc495417076",
-                "sha256:13970e665a4ec4cec7d067d7d3504a0398c657d91d26c581144ad9044e429c9a",
-                "sha256:1557817cea6e0b87fad2a3e20da385170efb03a313db164e8078955add2dfa1b",
-                "sha256:1b0fb036a2f9dd93d9a35c57c26420eeb4b571fcb14b51cddf5b1e73ea5d882b",
-                "sha256:24d9e58d08e8cd545d8a3247a18654aff0e5e60414701696a8098fbb0d792b75",
-                "sha256:2c38b586163d2b91567fe5e6d9e7798f792012365adc838a64b66b22dce3f4d4",
-                "sha256:2df3ab4348507de60e1cbf75196403df1b9b4c4d4dc5bd11ac4eb63c46f691c7",
-                "sha256:32f70f7c90454ea568b868af2e96616743718d9233d23f62407e98caed81dfbf",
-                "sha256:3af2a49d576820045c9c880ff29a5a96d020fe31b35d248519bfc6ccb8be4eac",
-                "sha256:4ff7d63800a63db031ebac6a6f581ae84877c959401c24c28f2cc51fd36c47ad",
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+                "sha256:02aef8ef1a5ac5f0836b543e462eb421df6048a7974211a906148053b8055ea6",
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+                "sha256:25c77692ea8c0929d4ad400ea9c3dcbcc4936cee84e437e0ef80da58fa73d88a",
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+                "sha256:355bd7d7ce5ff2917d217f0e8ddac568cb7403e1ce1639b35a924db7d13a39b6",
+                "sha256:4a0a33ada3f6f94f855f92460896ef08c798dcc5f17d9364d1735c5adc9d7e4a",
+                "sha256:4d3b6e66f32528bf43ca2297caca768280a8e068820b1c3dca0fcf9f03c7d6f1",
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+                "sha256:5ae532b93cf9ce5a2a549b74a2c35e3b690b171ece9358519b3039c7b84c887e",
+                "sha256:5dab393ab96b2ce4012823b2f2ed4ee907150424d2f02b97bd6f8dd8f17cc866",
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+                "sha256:9e9cfe55dc7ac2aa47e0fd3285ff829685f96803197042c9d2f0fb44e4b39b2c",
+                "sha256:a22daaf30037b8e59d6968c76fe0f7ff062c976c7a026e92fbefc4c4bf3fc5a4",
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+                "sha256:a71138366d57901597bfcc52af7f076ab61c046f409c7b429011cd68de8f9fe6",
+                "sha256:b4efde5524579a9ce0459ca35a57a48ca878a4973514b8bb88cb80d7c9d34c85",
+                "sha256:b78af4d42985ab3143d9882d0006f48d12f1bc4ba88e78f23762777c3ee64571",
+                "sha256:bb2987eb3af9bcf46019be39b82c120c3d35639a95bc4ee2d08f36ecdf469345",
+                "sha256:c03ce53690fe492845e14f4ab7e67d5a429a06db99b226b5c7caa23081c1e2bb",
+                "sha256:c59b9280284b791377b3524c8e39ca7b74ae2881ba1a6c51b36f4f1bb94cee49",
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+                "sha256:f3614dabd2cc8741850597b418bcf644d4f60e73615906c3acc407b78ff720b3",
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+                "sha256:fb62996c61eeff56b59ab8abfcaa0859ec2223392c03d6085048b576b567459b"
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             "index": "pypi",
-            "version": "==1.24.3"
+            "version": "==1.27.2"
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         "protobuf": {
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-                "sha256:f99f127909731cafb841c52f9216e447d3e4afb99b17bebfad327a75aee206de"
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+                "sha256:82d7ac987715d8d1eb4068bf997f3053468e0ce0287e2729c30601feb6602fee",
+                "sha256:8eb9c93798b904f141d9de36a0ba9f9b73cc382869e67c9e642c0aba53b0fc07",
+                "sha256:adf0e4d57b33881d0c63bb11e7f9038f98ee0c3e334c221f0858f826e8fb0151",
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+                "sha256:c77c974d1dadf246d789f6dad1c24426137c9091e930dbf50e0a29c1fcf00b1f",
+                "sha256:dd9aa4401c36785ea1b6fff0552c674bdd1b641319cb07ed1fe2392388e9b0d7",
+                "sha256:e11df1ac6905e81b815ab6fd518e79be0a58b5dc427a2cf7208980f30694b956",
+                "sha256:e2f8a75261c26b2f5f3442b0525d50fd79a71aeca04b5ec270fc123536188306",
+                "sha256:e512b7f3a4dd780f59f1bf22c302740e27b10b5c97e858a6061772668cd6f961",
+                "sha256:ef2c2e56aaf9ee914d3dccc3408d42661aaf7d9bb78eaa8f17b2e6282f214481",
+                "sha256:fac513a9dc2a74b99abd2e17109b53945e364649ca03d9f7a0b96aa8d1807d0a",
+                "sha256:fdfb6ad138dbbf92b5dbea3576d7c8ba7463173f7d2cb0ca1bd336ec88ddbd80"
             ],
             "index": "pypi",
-            "version": "==3.10.0"
+            "version": "==3.11.3"
         },
         "pycparser": {
             "hashes": [
@@ -188,10 +180,10 @@
         },
         "six": {
             "hashes": [
-                "sha256:3350809f0555b11f552448330d0b52d5f24c91a322ea4a15ef22629740f3761c",
-                "sha256:d16a0141ec1a18405cd4ce8b4613101da75da0e9a7aec5bdd4fa804d0e0eba73"
+                "sha256:236bdbdce46e6e6a3d61a337c0f8b763ca1e8717c03b369e87a7ec7ce1319c0a",
+                "sha256:8f3cd2e254d8f793e7f3d6d9df77b92252b52637291d0f0da013c76ea2724b6c"
             ],
-            "version": "==1.12.0"
+            "version": "==1.14.0"
         },
         "toml": {
             "hashes": [
@@ -210,12 +202,12 @@
             ],
             "version": "==0.7.12"
         },
-        "atomicwrites": {
+        "appdirs": {
             "hashes": [
-                "sha256:03472c30eb2c5d1ba9227e4c2ca66ab8287fbfbbda3888aa93dc2e28fc6811b4",
-                "sha256:75a9445bac02d8d058d5e1fe689654ba5a6556a1dfd8ce6ec55a0ed79866cfa6"
+                "sha256:9e5896d1372858f8dd3344faf4e5014d21849c756c8d5701f78f8a103b372d92",
+                "sha256:d8b24664561d0d34ddfaec54636d502d7cea6e29c3eaf68f3df6180863e2166e"
             ],
-            "version": "==1.3.0"
+            "version": "==1.4.3"
         },
         "attrs": {
             "hashes": [
@@ -226,24 +218,24 @@
         },
         "babel": {
             "hashes": [
-                "sha256:af92e6106cb7c55286b25b38ad7695f8b4efb36a90ba483d7f7a6628c46158ab",
-                "sha256:e86135ae101e31e2c8ec20a4e0c5220f4eed12487d5cf3f78be7e98d3a57fc28"
+                "sha256:1aac2ae2d0d8ea368fa90906567f5c08463d98ade155c0c4bfedd6a0f7160e38",
+                "sha256:d670ea0b10f8b723672d3a6abeb87b565b244da220d76b4dba1b66269ec152d4"
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-            "version": "==2.7.0"
+            "version": "==2.8.0"
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         "bleach": {
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-                "sha256:213336e49e102af26d9cde77dd2d0397afabc5a6bf2fed985dc35b5d1e285a16",
-                "sha256:3fdf7f77adcf649c9911387df51254b813185e32b2c6619f690b593a617e19fa"
+                "sha256:44f69771e2ac81ff30d929d485b7f9919f3ad6d019b6b20c74f3b8687c3f70df",
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-            "version": "==3.1.0"
+            "version": "==3.1.1"
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-                "sha256:fd7c7c74727ddcf00e9acd26bba8da604ffec95bf1c2144e67aff7a8b50e6cef"
+                "sha256:017c25db2a153ce562900032d5bc68e9f191e44e9a0f762f373977de9df1fbb3",
+                "sha256:25b64c7da4cd7479594d035c08c2d809eb4aab3a26e5a990ea98cc450c320f1f"
             ],
-            "version": "==2019.9.11"
+            "version": "==2019.11.28"
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@@ -260,58 +252,54 @@
             "index": "pypi",
             "version": "==2.0.15"
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-        "colorama": {
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             ],
-            "version": "==0.15.2"
+            "version": "==0.16"
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         "entrypoints": {
             "hashes": [
@@ -337,140 +325,137 @@
         },
         "grpcio": {
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+                "sha256:6965f19a6a2039c7d48bca7dba2473069ff854c36ae6f19d2cde309d998228a1",
+                "sha256:b1f6b5a4eab1f73479a50fb79fcf729514a900c341d8503d62a62dbc4127a2b1"
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-            "version": "==1.1.0"
+            "version": "==1.2.0"
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         "importlib-metadata": {
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-                "sha256:d5f18a79777f3aa179c145737780282e27b508fc8fd688cb17c7a813e8bd39af"
+                "sha256:06f5b3a99029c7134207dd882428a66992a9de2bef7c2b699b5641f9886c3302",
+                "sha256:b97607a1a18a5100839aec1dc26a1ea17ee0d93b20b0f008d80a5a050afb200b"
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             "markers": "python_version < '3.8'",
-            "version": "==0.23"
+            "version": "==1.5.0"
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         "jinja2": {
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-                "sha256:9fe95f19286cfefaa917656583d020be14e7859c6b0252588391e47db34527de"
+                "sha256:93187ffbc7808079673ef52771baa950426fd664d3aad1d0fa3e95644360e250",
+                "sha256:b0eaf100007721b5c16c1fc1eecb87409464edc10469ddc9a22a27a99123be49"
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-            "version": "==2.10.3"
+            "version": "==2.11.1"
+        },
+        "keyring": {
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+                "sha256:24ae23ab2d6adc59138339e56843e33ec7b0a6b2f06302662477085c6c0aca00"
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+            "version": "==21.1.0"
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@@ -478,13 +463,16 @@
                 "sha256:09027a7803a62ca78792ad89403b1b7a73a01c8cb65909cd876f7fcebd79b161",
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                 "sha256:1027c282dad077d0bae18be6794e6b6b8c91d58ed8a8d89a89d59693b9131db5",
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                 "sha256:535f6fc4d397c1563d08b88e485c3496cf5784e927af890fb3c3aac7f933ec66",
+                "sha256:596510de112c685489095da617b5bcbbac7dd6384aeebeda4df6025d0256a81b",
                 "sha256:62fe6c95e3ec8a7fad637b7f3d372c15ec1caa01ab47926cfdf7a75b40e0eac1",
+                "sha256:6788b695d50a51edb699cb55e35487e430fa21f1ed838122d722e0ff0ac5ba15",
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                 "sha256:79855e1c5b8da654cf486b830bd42c06e8780cea587384cf6545b7d9ac013a0b",
@@ -501,7 +489,9 @@
                 "sha256:ba59edeaa2fc6114428f1637ffff42da1e311e29382d81b339c1817d37ec93c6",
                 "sha256:c8716a48d94b06bb3b2524c2b77e055fb313aeb4ea620c8dd03a105574ba704f",
                 "sha256:cd5df75523866410809ca100dc9681e301e3c27567cf498077e8551b6d20e42f",
-                "sha256:e249096428b3ae81b08327a63a485ad0878de3fb939049038579ac0ef61e17e7"
+                "sha256:cdb132fc825c38e1aeec2c8aa9338310d29d337bebbd7baa06889d09a60a1fa2",
+                "sha256:e249096428b3ae81b08327a63a485ad0878de3fb939049038579ac0ef61e17e7",
+                "sha256:e8313f01ba26fbbe36c7be1966a7b7424942f670f38e666995b88d012765b9be"
             ],
             "version": "==1.1.1"
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@@ -514,17 +504,44 @@
         },
         "more-itertools": {
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-                "sha256:92b8c4b06dac4f0611c0729b2f2ede52b2e1bac1ab48f089c7ddc12e26bb60c4"
+                "sha256:5dd8bcf33e5f9513ffa06d5ad33d78f31e1931ac9a18f33d37e77a180d393a7c",
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-            "version": "==7.2.0"
+            "version": "==8.2.0"
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+        "mypy": {
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+                "sha256:2c35cae79ceb20d47facfad51f952df16c2ae9f45db6cb38405a3da1cf8fc0a7",
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+                "sha256:85baab8d74ec601e86134afe2bcccd87820f79d2f8d5798c889507d1088287bf",
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+                "sha256:a6bd44efee4dc8c3324c13785a9dc3519b3ee3a92cada42d2b57762b7053b49b",
+                "sha256:c6d27bd20c3ba60d5b02f20bd28e20091d6286a699174dfad515636cb09b5a72",
+                "sha256:e2bb577d10d09a2d8822a042a23b8d62bc3b269667c9eb8e60a6edfa000211b1",
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+            ],
+            "index": "pypi",
+            "version": "==0.761"
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+        "mypy-extensions": {
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+                "sha256:2d82818f5bb3e369420cb3c4060a7970edba416647068eb4c5343488a6c604a8"
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         "packaging": {
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-                "sha256:d9551545c6d761f3def1677baf08ab2a3ca17c56879e70fecba2fc4dde4ed108"
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-            "version": "==19.2"
+            "version": "==20.1"
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         "pkginfo": {
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@@ -535,39 +552,41 @@
         },
         "pluggy": {
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-                "sha256:fa5fa1622fa6dd5c030e9cad086fa19ef6a0cf6d7a2d12318e10cb49d6d68f34"
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-            "version": "==0.13.0"
+            "version": "==0.13.1"
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-                "sha256:f99f127909731cafb841c52f9216e447d3e4afb99b17bebfad327a75aee206de"
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+                "sha256:82d7ac987715d8d1eb4068bf997f3053468e0ce0287e2729c30601feb6602fee",
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+                "sha256:c77c974d1dadf246d789f6dad1c24426137c9091e930dbf50e0a29c1fcf00b1f",
+                "sha256:dd9aa4401c36785ea1b6fff0552c674bdd1b641319cb07ed1fe2392388e9b0d7",
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+                "sha256:e2f8a75261c26b2f5f3442b0525d50fd79a71aeca04b5ec270fc123536188306",
+                "sha256:e512b7f3a4dd780f59f1bf22c302740e27b10b5c97e858a6061772668cd6f961",
+                "sha256:ef2c2e56aaf9ee914d3dccc3408d42661aaf7d9bb78eaa8f17b2e6282f214481",
+                "sha256:fac513a9dc2a74b99abd2e17109b53945e364649ca03d9f7a0b96aa8d1807d0a",
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             "index": "pypi",
-            "version": "==3.10.0"
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-                "sha256:dc639b046a6e2cff5bbe40194ad65936d6ba360b52b3c3fe1d08a82dd50b5e53"
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-            "version": "==1.8.0"
+            "version": "==1.8.1"
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         "pycodestyle": {
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@@ -585,25 +604,25 @@
         },
         "pygments": {
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-                "sha256:881c4c157e45f30af185c1ffe8d549d48ac9127433f2c380c24b84572ad66297"
+                "sha256:2a3fe295e54a20164a9df49c75fa58526d3be48e14aceba6d6b1e8ac0bfd6f1b",
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-            "version": "==2.4.2"
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-                "sha256:d9338df12903bbf5d65a0e4e87c2161968b10d2e489652bb47001d82a9b028b4"
+                "sha256:4c830582a84fb022400b85429791bc551f1f4871c33f23e44f353119e92f969f",
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-            "version": "==2.4.2"
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         "pytest": {
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-                "sha256:58cee9e09242937e136dbb3dab466116ba20d6b7828c7620f23947f37eb4dae4"
+                "sha256:0d5fe9189a148acc3c3eb2ac8e1ac0742cb7618c084f3d228baaec0c254b318d",
+                "sha256:ff615c761e25eb25df19edddc0b970302d2a9091fbce0e7213298d85fb61fef6"
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-            "version": "==5.2.2"
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@@ -615,11 +634,11 @@
         },
         "pytest-mock": {
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-                "sha256:b3514caac35fe3f05555923eabd9546abce11571cc2ddf7d8615959d04f2c89e",
-                "sha256:ea502c3891599c26243a3a847ccf0b1d20556678c528f86c98e3cd6d40c5cf11"
+                "sha256:b35eb281e93aafed138db25c8772b95d3756108b601947f89af503f8c629413f",
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-            "version": "==1.11.2"
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         "pytz": {
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@@ -637,10 +656,10 @@
         },
         "requests": {
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-                "sha256:11e007a8a2aa0323f5a921e9e6a2d7e4e67d9877e85773fba9ba6419025cbeb4",
-                "sha256:9cf5292fcd0f598c671cfc1e0d7d1a7f13bb8085e9a590f48c010551dc6c4b31"
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-            "version": "==2.22.0"
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         "requests-toolbelt": {
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@@ -651,10 +670,10 @@
         },
         "six": {
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-                "sha256:d16a0141ec1a18405cd4ce8b4613101da75da0e9a7aec5bdd4fa804d0e0eba73"
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-            "version": "==1.12.0"
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         "snowballstemmer": {
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@@ -665,11 +684,11 @@
         },
         "sphinx": {
             "hashes": [
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-                "sha256:52286a0b9d7caa31efee301ec4300dbdab23c3b05da1c9024b4e84896fb73d79"
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@@ -731,48 +750,82 @@
         },
         "tox": {
             "hashes": [
-                "sha256:0bc216b6a2e6afe764476b4a07edf2c1dab99ed82bb146a1130b2e828f5bff5e",
-                "sha256:c4f6b319c20ba4913dbfe71ebfd14ff95d1853c4231493608182f66e566ecfe1"
+                "sha256:0cbe98369081fa16bd6f1163d3d0b2a62afa29d402ccfad2bd09fb2668be0956",
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-            "version": "==3.14.0"
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         "tqdm": {
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-                "sha256:fca09992116d6dc3ad9789cf601a254081eb40d5c14c1863ab6cd10e15c2cb26"
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-            "version": "==4.37.0"
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-                "sha256:9fe7091715c7576df166df8ef6654e61bada39571783f2fd415bdcba867c6993"
+                "sha256:c1af8ca391e43b0a06bbc155f7f67db0bf0d19d284bfc88d1675da497a946124",
+                "sha256:d561a5e511f70275e5a485a6275ff61851c16ffcb3a95a602189161112d9f160"
             ],
             "index": "pypi",
-            "version": "==2.0.0"
+            "version": "==3.1.1"
+        },
+        "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"
+        },
+        "typing-extensions": {
+            "hashes": [
+                "sha256:091ecc894d5e908ac75209f10d5b4f118fbdb2eb1ede6a63544054bb1edb41f2",
+                "sha256:910f4656f54de5993ad9304959ce9bb903f90aadc7c67a0bef07e678014e892d",
+                "sha256:cf8b63fedea4d89bab840ecbb93e75578af28f76f66c35889bd7065f5af88575"
+            ],
+            "version": "==3.7.4.1"
         },
         "urllib3": {
             "hashes": [
-                "sha256:3de946ffbed6e6746608990594d08faac602528ac7015ac28d33cee6a45b7398",
-                "sha256:9a107b99a5393caf59c7aa3c1249c16e6879447533d0887f4336dde834c7be86"
+                "sha256:2f3db8b19923a873b3e5256dc9c2dedfa883e33d87c690d9c7913e1f40673cdc",
+                "sha256:87716c2d2a7121198ebcb7ce7cccf6ce5e9ba539041cfbaeecfb641dc0bf6acc"
             ],
             "index": "pypi",
-            "version": "==1.25.6"
+            "version": "==1.25.8"
         },
         "virtualenv": {
             "hashes": [
-                "sha256:11cb4608930d5fd3afb545ecf8db83fa50e1f96fc4fca80c94b07d2c83146589",
-                "sha256:d257bb3773e48cac60e475a19b608996c73f4d333b3ba2e4e57d5ac6134e0136"
+                "sha256:08f3623597ce73b85d6854fb26608a6f39ee9d055c81178dc6583803797f8994",
+                "sha256:de2cbdd5926c48d7b84e0300dea9e8f276f61d186e8e49223d71d91250fbaebd"
             ],
-            "version": "==16.7.7"
+            "version": "==20.0.4"
         },
         "wcwidth": {
             "hashes": [
-                "sha256:3df37372226d6e63e1b1e1eda15c594bca98a22d33a23832a90998faa96bc65e",
-                "sha256:f4ebe71925af7b40a864553f761ed559b43544f8f71746c2d756c7fe788ade7c"
+                "sha256:8fd29383f539be45b20bd4df0dc29c20ba48654a41e661925e612311e9f3c603",
+                "sha256:f28b3e8a6483e5d49e7f8949ac1a78314e740333ae305b4ba5defd3e74fb37a8"
             ],
-            "version": "==0.1.7"
+            "version": "==0.1.8"
         },
         "webencodings": {
             "hashes": [
@@ -783,18 +836,18 @@
         },
         "wheel": {
             "hashes": [
-                "sha256:10c9da68765315ed98850f8e048347c3eb06dd81822dc2ab1d4fde9dc9702646",
-                "sha256:f4da1763d3becf2e2cd92a14a7c920f0f00eca30fdde9ea992c836685b9faf28"
+                "sha256:8788e9155fe14f54164c1b9eb0a319d98ef02c160725587ad60f14ddc57b6f96",
+                "sha256:df277cb51e61359aba502208d680f90c0493adec6f0e848af94948778aed386e"
             ],
             "index": "pypi",
-            "version": "==0.33.6"
+            "version": "==0.34.2"
         },
         "zipp": {
             "hashes": [
-                "sha256:3718b1cbcd963c7d4c5511a8240812904164b7f381b647143a89d3b98f9bcd8e",
-                "sha256:f06903e9f1f43b12d371004b4ac7b06ab39a44adc747266928ae6debfa7b3335"
+                "sha256:12248a63bbdf7548f89cb4c7cda4681e537031eda29c02ea29674bc6854460c2",
+                "sha256:7c0f8e91abc0dc07a5068f315c52cb30c66bfbc581e5b50704c8a2f6ebae794a"
             ],
-            "version": "==0.6.0"
+            "version": "==3.0.0"
         }
     }
 }
diff --git a/mypy.ini b/mypy.ini
new file mode 100644
index 00000000..20f8712e
--- /dev/null
+++ b/mypy.ini
@@ -0,0 +1,25 @@
+[mypy]
+
+[mypy-aergo.herapy.grpc.*]
+ignore_errors = True
+
+[mypy-grpc]
+ignore_missing_imports = True
+[mypy-grpc._channel]
+ignore_missing_imports = True
+
+[mypy-pytest]
+ignore_missing_imports = True
+
+[mypy-ecdsa]
+ignore_missing_imports = True
+[mypy-ecdsa.ecdsa]
+ignore_missing_imports = True
+[mypy-ecdsa.util]
+ignore_missing_imports = True
+
+# https://github.com/python/typeshed/issues/2521
+# aergo/herapy/obj/change_conf_info.py:15: error: Argument 1 to "Value" of "EnumTypeWrapper" has incompatible type "str"; expected "bytes"
+# error seems to be raised due to protobuf
+[mypy-aergo.herapy.obj.change_conf_info]
+ignore_errors = True
\ No newline at end of file
diff --git a/requirements.txt b/requirements.txt
index adc98b06..4c5f2b94 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,11 +1,10 @@
-asn1crypto==1.3.0
 base58==2.0.0
-cffi==1.13.2
+cffi==1.14.0
 cryptography==2.8
 ecdsa==0.15
-googleapis-common-protos==1.6.0
-grpcio==1.26.0
-protobuf==3.11.2
+googleapis-common-protos==1.51.0
+grpcio==1.27.2
+protobuf==3.11.3
 pycparser==2.19
 six==1.14.0
 toml==0.10.0
diff --git a/requirements_dev.txt b/requirements_dev.txt
index c2ab47d1..09c63663 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -1,52 +1,49 @@
 alabaster==0.7.12
-asn1crypto==1.3.0
-atomicwrites==1.3.0
+appdirs==1.4.3
 attrs==19.3.0
-Babel==2.8.0
-base58==2.0.0
-bleach==3.1.0
+babel==2.8.0
+bleach==3.1.1
 certifi==2019.11.28
-cffi==1.13.2
 chardet==3.0.4
 codecov==2.0.15
 coverage==5.0.3
-cryptography==2.8
+distlib==0.3.0
 docutils==0.16
-ecdsa==0.15
 entrypoints==0.3
 filelock==3.0.12
 flake8==3.7.9
-googleapis-common-protos==1.6.0
-grpcio==1.26.0
-grpcio-tools==1.26.0
-idna==2.8
+grpcio-tools==1.27.2
+grpcio==1.27.2
+idna==2.9
 imagesize==1.2.0
-importlib-metadata==1.5.0
-Jinja2==2.11.1
-MarkupSafe==1.1.1
+importlib-metadata==1.5.0 ; python_version < '3.8'
+jinja2==2.11.1
+keyring==21.1.0
+markupsafe==1.1.1
 mccabe==0.6.1
 more-itertools==8.2.0
+mypy-extensions==0.4.3
+mypy==0.761
 packaging==20.1
 pkginfo==1.5.0.1
 pluggy==0.13.1
-protobuf==3.11.2
+protobuf==3.11.3
 py==1.8.1
 pycodestyle==2.5.0
-pycparser==2.19
 pyflakes==2.1.1
-Pygments==2.5.2
+pygments==2.5.2
 pyparsing==2.4.6
-pytest==5.3.5
 pytest-cov==2.8.1
 pytest-mock==2.0.0
+pytest==5.3.5
 pytz==2019.3
 readme-renderer==24.0
-requests==2.22.0
 requests-toolbelt==0.9.1
+requests==2.23.0
 six==1.14.0
 snowballstemmer==2.0.0
-Sphinx==2.3.1
 sphinx-rtd-theme==0.4.3
+sphinx==2.4.2
 sphinxcontrib-applehelp==1.0.1
 sphinxcontrib-devhelp==1.0.1
 sphinxcontrib-htmlhelp==1.0.2
@@ -54,11 +51,14 @@ sphinxcontrib-jsmath==1.0.1
 sphinxcontrib-qthelp==1.0.2
 sphinxcontrib-serializinghtml==1.1.3
 toml==0.10.0
-tox==3.14.3
-tqdm==4.42.0
+tox==3.14.5
+tqdm==4.43.0
 twine==3.1.1
+typed-ast==1.4.1
+typing-extensions==3.7.4.1
 urllib3==1.25.8
-virtualenv==16.7.9
+virtualenv==20.0.4
 wcwidth==0.1.8
 webencodings==0.5.1
-zipp==2.1.0
+wheel==0.34.2
+zipp==3.0.0