diff --git a/package-lock.json b/package-lock.json
index 53eb214..7d7f178 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -6,10 +6,12 @@
     "": {
       "name": "harmony-sdk-core",
       "license": "MIT",
-      "workspaces": ["packages/*"],
+      "workspaces": [
+        "packages/*"
+      ],
       "dependencies": {
         "@harmony-js/core": "^0.1.36",
-        "tslib": "^1.10.0",
+        "tslib": "^2.4.0",
         "typedoc-plugin-internal-external": "^2.1.1"
       },
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@@ -71,7 +73,7 @@
         "gulp-typedoc": "^2.2.2",
         "husky": "^1.1.2",
         "jest": "^23.4.2",
-        "jest-fetch-mock": "^1.6.6",
+        "jest-fetch-mock": "^3.0.3",
         "jest-json-schema": "^2.0.1",
         "jest-watch-typeahead": "^0.2.0",
         "jsdoc": "^3.6.3",
@@ -82,7 +84,7 @@
         "pretty-quick": "^1.8.0",
         "protobufjs": "^6.8.8",
         "rimraf": "^2.6.2",
-        "rollup": "^0.66.6",
+        "rollup": "1.26.3",
         "rollup-plugin-alias": "^1.4.0",
         "rollup-plugin-babel": "^4.3.2",
         "rollup-plugin-commonjs": "^9.2.0",
@@ -97,7 +99,7 @@
         "terser-webpack-plugin": "^2.1.2",
         "ts-jest": "^23.1.3",
         "ts-node": "^7.0.1",
-        "tslib": "^1.11.1",
+        "tslib": "^2.4.0",
         "tslint": "^5.11.0",
         "tslint-config-prettier": "^1.15.0",
         "typedoc": "^0.17.0-3",
@@ -2476,15 +2478,6 @@
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-      "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-2.6.1.tgz",
-      "integrity": "sha512-V4aYg89jEoVRxRb2fJdAg8FHvI7cEyYdVAh94HH0UIK8oJxUfkjlDQN9RbMx+bEjP7+ggMiFRprSti032Oipxw==",
-      "dev": true,
-      "engines": {
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@@ -3451,15 +3444,6 @@
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-      "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-2.6.1.tgz",
-      "integrity": "sha512-V4aYg89jEoVRxRb2fJdAg8FHvI7cEyYdVAh94HH0UIK8oJxUfkjlDQN9RbMx+bEjP7+ggMiFRprSti032Oipxw==",
-      "dev": true,
-      "engines": {
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-      }
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       "resolved": "https://registry.npmjs.org/universal-user-agent/-/universal-user-agent-5.0.0.tgz",
@@ -3719,6 +3703,16 @@
         "ajv": "^4.11.5"
       }
     },
+    "node_modules/@types/jest-json-schema/node_modules/ajv": {
+      "version": "4.11.8",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-4.11.8.tgz",
+      "integrity": "sha512-I/bSHSNEcFFqXLf91nchoNB9D1Kie3QKcWdchYUaoIg1+1bdWDkdfdlvdIOJbi9U8xR0y+MWc5D+won9v95WlQ==",
+      "dev": true,
+      "dependencies": {
+        "co": "^4.6.0",
+        "json-stable-stringify": "^1.0.1"
+      }
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       "resolved": "https://registry.npmjs.org/@types/json-schema/-/json-schema-7.0.6.tgz",
@@ -4097,18 +4091,6 @@
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-      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.2.tgz",
-      "integrity": "sha512-k+V+hzjm5q/Mr8ef/1Y9goCmlsK4I6Sm74teeyGvFk1XrOsbsKLjEdrvny42CZ+a8sXbk8KWpY/bDwS+FLL2UQ==",
-      "dev": true,
-      "dependencies": {
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-        "fast-json-stable-stringify": "^2.0.0",
-        "json-schema-traverse": "^0.4.1",
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@@ -4281,13 +4263,19 @@
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-      "resolved": "https://registry.npmjs.org/ajv/-/ajv-4.11.8.tgz",
-      "integrity": "sha1-gv+wKynmYq5TvcIK8VlHcGc5xTY=",
+      "version": "6.12.6",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.6.tgz",
+      "integrity": "sha512-j3fVLgvTo527anyYyJOGTYJbG+vnnQYvE0m5mmkc1TK+nxAppkCLMIL0aZ4dblVCNoGShhm+kzE4ZUykBoMg4g==",
       "dev": true,
       "dependencies": {
-        "co": "^4.6.0",
-        "json-stable-stringify": "^1.0.1"
+        "fast-deep-equal": "^3.1.1",
+        "fast-json-stable-stringify": "^2.0.0",
+        "json-schema-traverse": "^0.4.1",
+        "uri-js": "^4.2.2"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/epoberezkin"
       }
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@@ -4300,9 +4288,9 @@
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+      "version": "3.5.2",
+      "resolved": "https://registry.npmjs.org/ajv-keywords/-/ajv-keywords-3.5.2.tgz",
+      "integrity": "sha512-5p6WTN0DdTGVQk6VjcEju19IgaHudalcfabD7yhDGeA6bcQnmL+CpveLJq/3hvfwd1aof6L386Ougkx6RfyMIQ==",
       "dev": true,
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@@ -6413,6 +6401,12 @@
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       }
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+    "node_modules/chrome-trace-event/node_modules/tslib": {
+      "version": "1.14.1",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.14.1.tgz",
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+      "dev": true
+    },
     "node_modules/ci-info": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/ci-info/-/ci-info-2.0.0.tgz",
@@ -6738,7 +6732,9 @@
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       "dev": true,
-      "engines": ["node >= 0.8"],
+      "engines": [
+        "node >= 0.8"
+      ],
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@@ -7920,7 +7916,9 @@
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       "dev": true,
-      "engines": ["node >= 6.0"],
+      "engines": [
+        "node >= 6.0"
+      ],
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@@ -8195,13 +8193,11 @@
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-      "resolved": "https://registry.npmjs.org/cross-fetch/-/cross-fetch-2.2.3.tgz",
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-      "dev": true,
+      "version": "3.1.5",
+      "resolved": "https://registry.npmjs.org/cross-fetch/-/cross-fetch-3.1.5.tgz",
+      "integrity": "sha512-lvb1SBsI0Z7GDwmuid+mU3kWVBwTVUbe7S0H52yaaAdQOXq2YktTCZdlAcNKFzE6QtRz0snpw9bNiPeOIkkQvw==",
       "dependencies": {
-        "node-fetch": "2.1.2",
-        "whatwg-fetch": "2.0.4"
+        "node-fetch": "2.6.7"
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@@ -9523,7 +9519,9 @@
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       "integrity": "sha1-lpGEQOMEGnpBT4xS48V06zw+HgU=",
       "dev": true,
-      "engines": ["node >=0.6.0"]
+      "engines": [
+        "node >=0.6.0"
+      ]
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@@ -9934,12 +9932,16 @@
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-      "bundleDependencies": ["node-pre-gyp"],
+      "bundleDependencies": [
+        "node-pre-gyp"
+      ],
       "deprecated": "fsevents 1 will break on node v14+ and could be using insecure binaries. Upgrade to fsevents 2.",
       "dev": true,
       "hasInstallScript": true,
       "optional": true,
-      "os": ["darwin"],
+      "os": [
+        "darwin"
+      ],
       "dependencies": {
         "bindings": "^1.5.0",
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@@ -10680,7 +10682,11 @@
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-      "bundleDependencies": ["source-map-support", "yargs", "ethereumjs-util"],
+      "bundleDependencies": [
+        "source-map-support",
+        "yargs",
+        "ethereumjs-util"
+      ],
       "deprecated": "ganache-cli is now ganache; visit https://trfl.io/g7 for details",
       "dev": true,
       "dependencies": {
@@ -12673,18 +12679,6 @@
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-      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.2.tgz",
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-      "dev": true,
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-        "fast-deep-equal": "^3.1.1",
-        "fast-json-stable-stringify": "^2.0.0",
-        "json-schema-traverse": "^0.4.1",
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@@ -14358,13 +14352,13 @@
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-      "resolved": "https://registry.npmjs.org/jest-fetch-mock/-/jest-fetch-mock-1.7.5.tgz",
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+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/jest-fetch-mock/-/jest-fetch-mock-3.0.3.tgz",
+      "integrity": "sha512-Ux1nWprtLrdrH4XwE7O7InRY6psIi3GOsqNESJgMJ+M5cv4A8Lh7SN9d2V2kKRZ8ebAfcd1LNyZguAOb6JiDqw==",
       "dev": true,
       "dependencies": {
-        "cross-fetch": "^2.2.2",
-        "promise-polyfill": "^7.1.1"
+        "cross-fetch": "^3.0.4",
+        "promise-polyfill": "^8.1.3"
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@@ -14551,18 +14545,6 @@
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-      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.2.tgz",
-      "integrity": "sha512-k+V+hzjm5q/Mr8ef/1Y9goCmlsK4I6Sm74teeyGvFk1XrOsbsKLjEdrvny42CZ+a8sXbk8KWpY/bDwS+FLL2UQ==",
-      "dev": true,
-      "dependencies": {
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-        "fast-json-stable-stringify": "^2.0.0",
-        "json-schema-traverse": "^0.4.1",
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@@ -15931,7 +15913,9 @@
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       "integrity": "sha1-P02uSpH6wxX3EGL4UhzCOfE2YoA=",
       "dev": true,
-      "engines": ["node >= 0.2.0"]
+      "engines": [
+        "node >= 0.2.0"
+      ]
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     "node_modules/JSONStream": {
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@@ -15954,7 +15938,9 @@
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-      "engines": ["node >=0.6.0"],
+      "engines": [
+        "node >=0.6.0"
+      ],
       "dependencies": {
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@@ -17520,12 +17506,22 @@
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-      "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-2.1.2.tgz",
-      "integrity": "sha1-q4hOjn5X44qUR1POxwb3iNF2i7U=",
-      "dev": true,
+      "version": "2.6.7",
+      "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-2.6.7.tgz",
+      "integrity": "sha512-ZjMPFEfVx5j+y2yF35Kzx5sF7kDzxuDj6ziH4FFbOp87zKDZNx8yExJIb05OGF4Nlt9IHFIMBkRl41VdvcNdbQ==",
+      "dependencies": {
+        "whatwg-url": "^5.0.0"
+      },
       "engines": {
         "node": "4.x || >=6.0.0"
+      },
+      "peerDependencies": {
+        "encoding": "^0.1.0"
+      },
+      "peerDependenciesMeta": {
+        "encoding": {
+          "optional": true
+        }
       }
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     "node_modules/node-fetch-npm": {
@@ -17542,6 +17538,25 @@
         "node": ">=4"
       }
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+    "node_modules/node-fetch/node_modules/tr46": {
+      "version": "0.0.3",
+      "resolved": "https://registry.npmjs.org/tr46/-/tr46-0.0.3.tgz",
+      "integrity": "sha512-N3WMsuqV66lT30CrXNbEjx4GEwlow3v6rr4mCcv6prnfwhS01rkgyFdjPNBYd9br7LpXV1+Emh01fHnq2Gdgrw=="
+    },
+    "node_modules/node-fetch/node_modules/webidl-conversions": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-3.0.1.tgz",
+      "integrity": "sha512-2JAn3z8AR6rjK8Sm8orRC0h/bcl/DqL7tRPdGZ4I1CjdF+EaMLmYxBHyXuKL849eucPFhvBoxMsflfOb8kxaeQ=="
+    },
+    "node_modules/node-fetch/node_modules/whatwg-url": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-5.0.0.tgz",
+      "integrity": "sha512-saE57nupxk6v3HY35+jzBwYa0rKSy0XR8JSxZPwgLr7ys0IBzhGviA1/TUGJLmSVqs8pb9AnvICXEuOHLprYTw==",
+      "dependencies": {
+        "tr46": "~0.0.3",
+        "webidl-conversions": "^3.0.0"
+      }
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@@ -19134,9 +19149,9 @@
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+      "version": "8.2.3",
+      "resolved": "https://registry.npmjs.org/promise-polyfill/-/promise-polyfill-8.2.3.tgz",
+      "integrity": "sha512-Og0+jCRQetV84U8wVjMNccfGCnMQ9mGs9Hv78QFe+pSDD3gWTpz0y+1QCuxy5d/vBFuZ3iwP2eycAkvqIMPmWg==",
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@@ -19300,9 +19315,9 @@
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+      "resolved": "https://registry.npmjs.org/qs/-/qs-6.5.3.tgz",
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@@ -20009,16 +20024,17 @@
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-      "resolved": "https://registry.npmjs.org/rollup/-/rollup-0.66.6.tgz",
-      "integrity": "sha512-J7/SWanrcb83vfIHqa8+aVVGzy457GcjA6GVZEnD0x2u4OnOd0Q1pCrEoNe8yLwM6z6LZP02zBT2uW0yh5TqOw==",
+      "version": "1.26.3",
+      "resolved": "https://registry.npmjs.org/rollup/-/rollup-1.26.3.tgz",
+      "integrity": "sha512-8MhY/M8gnv3Q/pQQSWYWzbeJ5J1C5anCNY5BK1kV8Yzw9RFS0FF4lbLt+uyPO3wLKWXSXrhAL5pWL85TZAh+Sw==",
       "dev": true,
       "dependencies": {
-        "@types/estree": "0.0.39",
-        "@types/node": "*"
+        "@types/estree": "*",
+        "@types/node": "*",
+        "acorn": "^7.1.0"
       },
       "bin": {
-        "rollup": "bin/rollup"
+        "rollup": "dist/bin/rollup"
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     "node_modules/rollup-plugin-alias": {
@@ -20348,6 +20364,18 @@
         "estree-walker": "^0.6.1"
       }
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+    "node_modules/rollup/node_modules/acorn": {
+      "version": "7.4.1",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.4.1.tgz",
+      "integrity": "sha512-nQyp0o1/mNdbTO1PO6kHkwSrmgZ0MT/jCCpNiwbUjGoRN4dlBhqJtoQuCnEOKzgTVwg0ZWiCoQy6SxMebQVh8A==",
+      "dev": true,
+      "bin": {
+        "acorn": "bin/acorn"
+      },
+      "engines": {
+        "node": ">=0.4.0"
+      }
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