diff --git a/package-lock.json b/package-lock.json
index 53eb214..9115a96 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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         "jest": "^23.4.2",
-        "jest-fetch-mock": "^1.6.6",
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@@ -82,7 +84,7 @@
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@@ -97,7 +99,7 @@
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@@ -2476,15 +2478,6 @@
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-      "dev": true,
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@@ -3451,15 +3444,6 @@
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@@ -6413,6 +6397,12 @@
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+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.14.1.tgz",
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@@ -6738,7 +6728,9 @@
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-      "engines": ["node >= 0.8"],
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-      "engines": ["node >= 6.0"],
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@@ -8195,13 +8189,11 @@
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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,
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-      "os": ["darwin"],
+      "os": [
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@@ -10680,7 +10678,11 @@
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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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@@ -14358,13 +14360,13 @@
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+      "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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@@ -15931,7 +15933,9 @@
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@@ -15954,7 +15958,9 @@
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@@ -17520,12 +17526,22 @@
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-      "integrity": "sha1-q4hOjn5X44qUR1POxwb3iNF2i7U=",
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+      },
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+      },
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+        "encoding": {
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+        }
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@@ -17542,6 +17558,25 @@
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+      "resolved": "https://registry.npmjs.org/tr46/-/tr46-0.0.3.tgz",
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+    },
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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": {
+      "version": "5.0.0",
+      "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 +19169,9 @@
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@@ -20009,16 +20044,17 @@
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-        "@types/estree": "0.0.39",
-        "@types/node": "*"
+        "@types/estree": "*",
+        "@types/node": "*",
+        "acorn": "^7.1.0"
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+        "rollup": "dist/bin/rollup"
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@@ -20348,6 +20384,18 @@
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+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.4.1.tgz",
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+      "dev": true,
+      "bin": {
+        "acorn": "bin/acorn"
+      },
+      "engines": {
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@@ -20399,6 +20447,12 @@
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@@ -22443,9 +22497,9 @@
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+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.14.1.tgz",
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@@ -23899,12 +23967,6 @@
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@@ -24278,7 +24340,7 @@
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@@ -24294,36 +24356,9 @@
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