diff --git a/package-lock.json b/package-lock.json
index 53eb214..0879b32 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -6,10 +6,12 @@
     "": {
       "name": "harmony-sdk-core",
       "license": "MIT",
-      "workspaces": ["packages/*"],
+      "workspaces": [
+        "packages/*"
+      ],
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-        "tslib": "^1.10.0",
+        "tslib": "^2.4.0",
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@@ -71,7 +73,7 @@
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         "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 @@
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         "protobufjs": "^6.8.8",
         "rimraf": "^2.6.2",
-        "rollup": "^0.66.6",
+        "rollup": "1.26.3",
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@@ -97,7 +99,7 @@
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         "ts-node": "^7.0.1",
-        "tslib": "^1.11.1",
+        "tslib": "^2.4.0",
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         "tslint-config-prettier": "^1.15.0",
         "typedoc": "^0.17.0-3",
@@ -2476,15 +2478,6 @@
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@@ -3451,15 +3444,6 @@
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@@ -3719,6 +3703,16 @@
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+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-4.11.8.tgz",
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+      "dev": true,
+      "dependencies": {
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+        "json-stable-stringify": "^1.0.1"
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@@ -4097,18 +4091,6 @@
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@@ -4281,13 +4263,19 @@
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-      "integrity": "sha1-gv+wKynmYq5TvcIK8VlHcGc5xTY=",
+      "version": "6.12.6",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.6.tgz",
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-        "co": "^4.6.0",
-        "json-stable-stringify": "^1.0.1"
+        "fast-deep-equal": "^3.1.1",
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+        "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",
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@@ -6413,6 +6401,12 @@
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+    "node_modules/chrome-trace-event/node_modules/tslib": {
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+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.14.1.tgz",
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+      "dev": true
+    },
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       "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": [
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+      ],
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@@ -6825,37 +6821,6 @@
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@@ -7920,7 +7885,9 @@
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-      "engines": ["node >= 6.0"],
+      "engines": [
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+      ],
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@@ -8195,13 +8162,11 @@
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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 +9488,9 @@
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       "integrity": "sha1-lpGEQOMEGnpBT4xS48V06zw+HgU=",
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-      "engines": ["node >=0.6.0"]
+      "engines": [
+        "node >=0.6.0"
+      ]
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@@ -9934,12 +9901,16 @@
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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"
+      ],
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@@ -10680,7 +10651,11 @@
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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",
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@@ -12673,18 +12648,6 @@
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@@ -14358,13 +14321,13 @@
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+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/jest-fetch-mock/-/jest-fetch-mock-3.0.3.tgz",
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-        "cross-fetch": "^2.2.2",
-        "promise-polyfill": "^7.1.1"
+        "cross-fetch": "^3.0.4",
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@@ -14551,18 +14514,6 @@
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@@ -15931,7 +15882,9 @@
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-      "engines": ["node >= 0.2.0"]
+      "engines": [
+        "node >= 0.2.0"
+      ]
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@@ -15954,7 +15907,9 @@
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-      "engines": ["node >=0.6.0"],
+      "engines": [
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+      ],
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@@ -16438,9 +16393,9 @@
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@@ -17520,12 +17475,22 @@
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+      },
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+      },
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+        "encoding": {
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@@ -17542,6 +17507,25 @@
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+      "resolved": "https://registry.npmjs.org/tr46/-/tr46-0.0.3.tgz",
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+      "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-3.0.1.tgz",
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+    },
+    "node_modules/node-fetch/node_modules/whatwg-url": {
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+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-5.0.0.tgz",
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+        "webidl-conversions": "^3.0.0"
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@@ -19134,9 +19118,9 @@
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@@ -20009,16 +19993,17 @@
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