diff --git a/package-lock.json b/package-lock.json
index 517b9c6..174d8c9 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -504,9 +504,9 @@
       "dev": true
     },
     "es-abstract": {
-      "version": "1.14.2",
-      "resolved": "https://registry.npmjs.org/es-abstract/-/es-abstract-1.14.2.tgz",
-      "integrity": "sha512-DgoQmbpFNOofkjJtKwr87Ma5EW4Dc8fWhD0R+ndq7Oc456ivUfGOOP6oAZTTKl5/CcNMP+EN+e3/iUzgE0veZg==",
+      "version": "1.15.0",
+      "resolved": "https://registry.npmjs.org/es-abstract/-/es-abstract-1.15.0.tgz",
+      "integrity": "sha512-bhkEqWJ2t2lMeaJDuk7okMkJWI/yqgH/EoGwpcvv0XW9RWQsRspI4wt6xuyuvMvvQE3gg/D9HXppgk21w78GyQ==",
       "dev": true,
       "requires": {
         "es-to-primitive": "^1.2.0",
@@ -517,8 +517,8 @@
         "is-regex": "^1.0.4",
         "object-inspect": "^1.6.0",
         "object-keys": "^1.1.1",
-        "string.prototype.trimleft": "^2.0.0",
-        "string.prototype.trimright": "^2.0.0"
+        "string.prototype.trimleft": "^2.1.0",
+        "string.prototype.trimright": "^2.1.0"
       }
     },
     "es-to-primitive": {
@@ -912,9 +912,9 @@
       }
     },
     "is-buffer": {
-      "version": "2.0.3",
-      "resolved": "https://registry.npmjs.org/is-buffer/-/is-buffer-2.0.3.tgz",
-      "integrity": "sha512-U15Q7MXTuZlrbymiz95PJpZxu8IlipAp4dtS3wOdgPXx3mqBnslrWU14kxfHB+Py/+2PVKSr37dMAgM2A4uArw==",
+      "version": "2.0.4",
+      "resolved": "https://registry.npmjs.org/is-buffer/-/is-buffer-2.0.4.tgz",
+      "integrity": "sha512-Kq1rokWXOPXWuaMAqZiJW4XxsmD9zGx9q4aePabbn3qCRGedtH7Cm+zV8WETitMfu1wdh+Rvd6w5egwSngUX2A==",
       "dev": true
     },
     "is-callable": {
@@ -1250,9 +1250,9 @@
       }
     },
     "mocha": {
-      "version": "6.2.1",
-      "resolved": "https://registry.npmjs.org/mocha/-/mocha-6.2.1.tgz",
-      "integrity": "sha512-VCcWkLHwk79NYQc8cxhkmI8IigTIhsCwZ6RTxQsqK6go4UvEhzJkYuHm8B2YtlSxcYq2fY+ucr4JBwoD6ci80A==",
+      "version": "6.2.2",
+      "resolved": "https://registry.npmjs.org/mocha/-/mocha-6.2.2.tgz",
+      "integrity": "sha512-FgDS9Re79yU1xz5d+C4rv1G7QagNGHZ+iXF81hO8zY35YZZcLEsJVfFolfsqKFWunATEvNzMK0r/CwWd/szO9A==",
       "dev": true,
       "requires": {
         "ansi-colors": "3.2.3",
diff --git a/package.json b/package.json
index a25f2d9..61b5efa 100644
--- a/package.json
+++ b/package.json
@@ -11,7 +11,7 @@
   "author": "Peter Evans",
   "license": "MIT",
   "devDependencies": {
-    "mocha": "6.2.1",
+    "mocha": "6.2.2",
     "istanbul": "0.4.5",
     "coveralls": "3.0.7",
     "stryker": "0.35.1",