diff --git a/build/quantities.js b/build/quantities.js
index 16c049d..7acdc98 100644
--- a/build/quantities.js
+++ b/build/quantities.js
@@ -24,7 +24,7 @@ SOFTWARE.
 (function (global, factory) {
   typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
   typeof define === 'function' && define.amd ? define(factory) :
-  (global.Qty = factory());
+  (global = global || self, global.Qty = factory());
 }(this, (function () { 'use strict';
 
   /**
diff --git a/package-lock.json b/package-lock.json
index d43ac4f..b2ececf 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5,118 +5,93 @@
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       "dev": true,
       "requires": {
-        "@babel/highlight": "^7.0.0"
+        "@babel/highlight": "^7.8.3"
       }
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+    "@babel/helper-validator-identifier": {
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+      "dev": true,
+      "requires": {
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+      },
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+          "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.11.0.tgz",
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+          "dev": true
+        }
+      }
+    },
+    "ansi-regex": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.0.tgz",
+      "integrity": "sha512-bY6fj56OUQ0hU1KjFNDQuJFezqKdrAyFdIevADiqrWHwSlbmBNMHp5ak2f40Pm8JTFyM2mqxkG6ngkHO11f/lg==",
       "dev": true
     },
+    "ansi-styles": {
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
+      "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
+      "dev": true,
+      "requires": {
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+      }
+    },
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       "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
@@ -133,18 +108,18 @@
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-      "integrity": "sha1-yz8+PHMtwPAe5wtAPzAuYddwmDg=",
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
+      "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
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-      "integrity": "sha1-Pv/DxQ4ABTH7cg6v+A8K6O8jz1k=",
+      "version": "1.1.11",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
+      "integrity": "sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==",
       "dev": true,
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-        "balanced-match": "^0.4.1",
+        "balanced-match": "^1.0.0",
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@@ -154,6 +129,17 @@
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       "dev": true
     },
+    "chalk": {
+      "version": "2.4.2",
+      "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
+      "integrity": "sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==",
+      "dev": true,
+      "requires": {
+        "ansi-styles": "^3.2.1",
+        "escape-string-regexp": "^1.0.5",
+        "supports-color": "^5.3.0"
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@@ -161,12 +147,12 @@
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-      "integrity": "sha1-s12sN2R5+sw+lHR9QdDQ9SOP/LU=",
+      "version": "3.1.0",
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       "dev": true,
       "requires": {
-        "restore-cursor": "^2.0.0"
+        "restore-cursor": "^3.1.0"
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@@ -217,15 +203,6 @@
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@@ -251,9 +228,9 @@
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+      "version": "8.0.0",
+      "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-8.0.0.tgz",
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@@ -263,9 +240,9 @@
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+      "resolved": "https://registry.npmjs.org/eslint/-/eslint-6.8.0.tgz",
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@@ -275,19 +252,19 @@
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         "doctrine": "^3.0.0",
         "eslint-scope": "^5.0.0",
-        "eslint-utils": "^1.4.2",
+        "eslint-utils": "^1.4.3",
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-        "espree": "^6.1.1",
+        "espree": "^6.1.2",
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         "glob-parent": "^5.0.0",
-        "globals": "^11.7.0",
+        "globals": "^12.1.0",
         "ignore": "^4.0.6",
         "import-fresh": "^3.0.0",
         "imurmurhash": "^0.1.4",
-        "inquirer": "^6.4.1",
+        "inquirer": "^7.0.0",
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@@ -296,7 +273,7 @@
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         "mkdirp": "^0.5.1",
         "natural-compare": "^1.4.0",
-        "optionator": "^0.8.2",
+        "optionator": "^0.8.3",
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@@ -305,86 +282,6 @@
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+    },
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+      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
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@@ -1137,16 +1020,16 @@
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+          "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-7.0.3.tgz",
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@@ -1159,15 +1042,6 @@
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@@ -1183,12 +1057,6 @@
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@@ -1199,9 +1067,9 @@
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-      "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.10.0.tgz",
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+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.11.1.tgz",
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     },
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@@ -1213,6 +1081,12 @@
         "prelude-ls": "~1.1.2"
       }
     },
+    "type-fest": {
+      "version": "0.8.1",
+      "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.8.1.tgz",
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+      "dev": true
+    },
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@@ -1237,10 +1111,10 @@
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-      "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
-      "integrity": "sha1-J1hIEIkUVqQXHI0CJkQa3pDLyus=",
+    "word-wrap": {
+      "version": "1.2.3",
+      "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.3.tgz",
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diff --git a/package.json b/package.json
index c808586..8438862 100644
--- a/package.json
+++ b/package.json
@@ -38,8 +38,8 @@
     "url": "https://github.com/gentooboontoo/js-quantities/issues"
   },
   "devDependencies": {
-    "eslint": "^6.3.0",
-    "jasmine": "3.x",
-    "rollup": "~0.57"
+    "eslint": "^6.8.0",
+    "jasmine": "^3.5.0",
+    "rollup": "2.x"
   }
 }