diff --git a/package-lock.json b/package-lock.json
index 92f4b54..7cc50da 100644
--- a/package-lock.json
+++ b/package-lock.json
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@@ -3919,6 +4184,12 @@
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@@ -4073,6 +4344,18 @@
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@@ -4243,6 +4532,26 @@
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+      "resolved": "https://registry.npmjs.org/string.prototype.trimleft/-/string.prototype.trimleft-2.1.0.tgz",
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+    "string.prototype.trimright": {
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+      "resolved": "https://registry.npmjs.org/string.prototype.trimright/-/string.prototype.trimright-2.1.0.tgz",
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@@ -4357,12 +4666,75 @@
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+          "requires": {
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+        "string-width": {
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+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
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+          "dev": true,
+          "requires": {
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+            "is-fullwidth-code-point": "^2.0.0",
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+        "strip-ansi": {
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+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
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@@ -4378,11 +4750,84 @@
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+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
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       "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=",
       "dev": true
+    },
+    "yargs": {
+      "version": "13.3.0",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.3.0.tgz",
+      "integrity": "sha512-2eehun/8ALW8TLoIl7MVaRUrg+yCnenu8B4kBlRxj3GJGDKU1Og7sMXPNm1BYyM1DOJmTZ4YeN/Nwxv+8XJsUA==",
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+      "requires": {
+        "cliui": "^5.0.0",
+        "find-up": "^3.0.0",
+        "get-caller-file": "^2.0.1",
+        "require-directory": "^2.1.1",
+        "require-main-filename": "^2.0.0",
+        "set-blocking": "^2.0.0",
+        "string-width": "^3.0.0",
+        "which-module": "^2.0.0",
+        "y18n": "^4.0.0",
+        "yargs-parser": "^13.1.1"
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+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.1.tgz",
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+      "requires": {
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+        "decamelize": "^1.2.0"
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+    "yargs-unparser": {
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+      "resolved": "https://registry.npmjs.org/yargs-unparser/-/yargs-unparser-1.6.0.tgz",
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   }
 }
diff --git a/package.json b/package.json
index 6099388..6dfb397 100644
--- a/package.json
+++ b/package.json
@@ -32,7 +32,7 @@
     "eslint-config-sinon": "^1.0.3",
     "eslint-plugin-ie11": "^1.0.0",
     "eslint-plugin-mocha": "^4.11.0",
-    "mocha": "^5.0.0",
+    "mocha": "^6.2.1",
     "nyc": "^11.7.3",
     "rollup": "0.65.2",
     "rollup-plugin-commonjs": "9.1.6"