diff --git a/package.json b/package.json
index 425c9894..1fed3e4a 100644
--- a/package.json
+++ b/package.json
@@ -49,7 +49,7 @@
         "sinon": "9.0.3",
         "tslint": "6.1.3",
         "tslint-config-prettier": "1.18.0",
-        "typechain": "2.0.0",
+        "typechain": "4.0.1",
         "typedoc": "0.19.1",
         "typedoc-plugin-sourcefile-url": "1.0.6",
         "typescript": "4.0.2",
diff --git a/yarn.lock b/yarn.lock
index 9e3478d8..c1bd56cb 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -157,10 +157,10 @@
   resolved "https://registry.yarnpkg.com/@types/node/-/node-10.17.32.tgz#4ef6ff8b842ea0eb3fcbc4331489f4ae64036fa8"
   integrity sha512-EUq+cjH/3KCzQHikGnNbWAGe548IFLSm93Vl8xA7EuYEEATiyOVDyEVuGkowL7c9V69FF/RiZSAOCFPApMs/ig==
 
-"@types/prettier@^1.13.2":
-  version "1.19.1"
-  resolved "https://registry.yarnpkg.com/@types/prettier/-/prettier-1.19.1.tgz#33509849f8e679e4add158959fdb086440e9553f"
-  integrity sha512-5qOlnZscTn4xxM5MeGXAMOsIOIKIbh9e85zJWfBRVPlRMEVawzoPhINYbRGkBZCI8LxvBe7tJCdWiarA99OZfQ==
+"@types/prettier@^2.1.1":
+  version "2.1.6"
+  resolved "https://registry.yarnpkg.com/@types/prettier/-/prettier-2.1.6.tgz#f4b1efa784e8db479cdb8b14403e2144b1e9ff03"
+  integrity sha512-6gOkRe7OIioWAXfnO/2lFiv+SJichKVSys1mSsgyrYHSEjk8Ctv4tSR/Odvnu+HWlH2C8j53dahU03XmQdd5fA==
 
 "@types/resolve@^0.0.8":
   version "0.0.8"
@@ -2990,10 +2990,10 @@ prepend-http@^1.0.1:
   resolved "https://registry.yarnpkg.com/prepend-http/-/prepend-http-1.0.4.tgz#d4f4562b0ce3696e41ac52d0e002e57a635dc6dc"
   integrity sha1-1PRWKwzjaW5BrFLQ4ALlemNdxtw=
 
-prettier@^1.14.2:
-  version "1.19.1"
-  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.19.1.tgz#f7d7f5ff8a9cd872a7be4ca142095956a60797cb"
-  integrity sha512-s7PoyDv/II1ObgQunCbB9PdLmUcBZcnWOcxDh7O0N/UwDEsHyqkW+Qh28jW+mVuCdx7gLB0BotYI1Y6uI9iyew==
+prettier@^2.1.2:
+  version "2.2.1"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-2.2.1.tgz#795a1a78dd52f073da0cd42b21f9c91381923ff5"
+  integrity sha512-PqyhM2yCjg/oKkFPtTGUojv7gnZAoG80ttl45O6x2Ug/rMJw4wcc9k6aaf2hibP7BGVCCM33gZoGjyvt9mm16Q==
 
 process-es6@^0.11.2, process-es6@^0.11.6:
   version "0.11.6"
@@ -3805,23 +3805,23 @@ ts-essentials@^1.0.0:
   resolved "https://registry.yarnpkg.com/ts-essentials/-/ts-essentials-1.0.4.tgz#ce3b5dade5f5d97cf69889c11bf7d2da8555b15a"
   integrity sha512-q3N1xS4vZpRouhYHDPwO0bDW3EZ6SK9CrrDHxi/D6BPReSjpVgWIOpLS2o0gSBZm+7q/wyKp6RVM1AeeW7uyfQ==
 
-ts-essentials@^6.0.3:
-  version "6.0.7"
-  resolved "https://registry.yarnpkg.com/ts-essentials/-/ts-essentials-6.0.7.tgz#5f4880911b7581a873783740ce8b94da163d18a6"
-  integrity sha512-2E4HIIj4tQJlIHuATRHayv0EfMGK3ris/GRk1E3CFnsZzeNV+hUmelbaTZHLtXaZppM5oLhHRtO04gINC4Jusw==
+ts-essentials@^7.0.1:
+  version "7.0.1"
+  resolved "https://registry.yarnpkg.com/ts-essentials/-/ts-essentials-7.0.1.tgz#d205508cae0cdadfb73c89503140cf2228389e2d"
+  integrity sha512-8lwh3QJtIc1UWhkQtr9XuksXu3O0YQdEE5g79guDfhCaU1FWTDIEDZ1ZSx4HTHUmlJZ8L812j3BZQ4a0aOUkSA==
 
-ts-generator@^0.0.8:
-  version "0.0.8"
-  resolved "https://registry.yarnpkg.com/ts-generator/-/ts-generator-0.0.8.tgz#7bd48ca064db026d9520bcb682b69efc20971d6a"
-  integrity sha512-Gi+aZCELpVL7Mqb+GuMgM+n8JZ/arZZib1iD/R9Ok8JDjOCOCrqS9b1lr72ku7J45WeDCFZxyJoRsiQvhokCnw==
+ts-generator@^0.1.1:
+  version "0.1.1"
+  resolved "https://registry.yarnpkg.com/ts-generator/-/ts-generator-0.1.1.tgz#af46f2fb88a6db1f9785977e9590e7bcd79220ab"
+  integrity sha512-N+ahhZxTLYu1HNTQetwWcx3so8hcYbkKBHTr4b4/YgObFTIKkOSSsaa+nal12w8mfrJAyzJfETXawbNjSfP2gQ==
   dependencies:
     "@types/mkdirp" "^0.5.2"
-    "@types/prettier" "^1.13.2"
+    "@types/prettier" "^2.1.1"
     "@types/resolve" "^0.0.8"
     chalk "^2.4.1"
     glob "^7.1.2"
     mkdirp "^0.5.1"
-    prettier "^1.14.2"
+    prettier "^2.1.2"
     resolve "^1.8.1"
     ts-essentials "^1.0.0"
 
@@ -3903,18 +3903,18 @@ type-is@~1.6.17, type-is@~1.6.18:
     media-typer "0.3.0"
     mime-types "~2.1.24"
 
-typechain@2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/typechain/-/typechain-2.0.0.tgz#62143b48cdf8f95a777f1b76617af077b2d44eee"
-  integrity sha512-O+hsAUwtBpqCfoq46Grm52OEdm0GBEu78LxrEzkkGdwUdCoCZpNb2HPzPoNB1MXiRnNhEOGMFyf05UbT2/bUEw==
+typechain@4.0.1:
+  version "4.0.1"
+  resolved "https://registry.yarnpkg.com/typechain/-/typechain-4.0.1.tgz#b40eaf5ede15588d97a4b9a5f85120f7ea1cf262"
+  integrity sha512-H/1VpRmplp1qhCTVLU9PCgzyVCQ7Lth7YvaaI1hTvT31IpWnLLNpDpQD4vXJGr26T9BsZ0ZIceOwieAbcoywXw==
   dependencies:
     command-line-args "^4.0.7"
     debug "^4.1.1"
     fs-extra "^7.0.0"
     js-sha3 "^0.8.0"
     lodash "^4.17.15"
-    ts-essentials "^6.0.3"
-    ts-generator "^0.0.8"
+    ts-essentials "^7.0.1"
+    ts-generator "^0.1.1"
 
 typedarray-to-buffer@^3.1.2:
   version "3.1.5"