diff --git a/package-lock.json b/package-lock.json
index 3531cb9..56b785b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -37,6 +37,12 @@
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@@ -64,6 +70,24 @@
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@@ -94,12 +118,30 @@
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@@ -146,6 +188,61 @@
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@@ -188,6 +285,41 @@
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@@ -249,6 +381,23 @@
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@@ -377,11 +555,38 @@
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@@ -414,6 +625,12 @@
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@@ -951,6 +1180,47 @@
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@@ -988,6 +1258,18 @@
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@@ -3376,12 +4505,33 @@
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@@ -3423,6 +4573,12 @@
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@@ -3489,6 +4645,48 @@
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@@ -3506,6 +4704,41 @@
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+          "dev": true,
+          "requires": {
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+          "resolved": "https://registry.npmjs.org/set-value/-/set-value-0.4.3.tgz",
+          "integrity": "sha1-fbCPnT0i3H945Trzw79GZuzfzPE=",
+          "dev": true,
+          "requires": {
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     "uniq": {
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       "resolved": "https://registry.npmjs.org/uniq/-/uniq-1.0.1.tgz",
@@ -3522,6 +4755,46 @@
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+    "unset-value": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/unset-value/-/unset-value-1.0.0.tgz",
+      "integrity": "sha1-g3aHP30jNRef+x5vw6jtDfyKtVk=",
+      "dev": true,
+      "requires": {
+        "has-value": "^0.3.1",
+        "isobject": "^3.0.0"
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+      "dependencies": {
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+          "resolved": "https://registry.npmjs.org/has-value/-/has-value-0.3.1.tgz",
+          "integrity": "sha1-ex9YutpiyoJ+wKIHgCVlSEWZXh8=",
+          "dev": true,
+          "requires": {
+            "get-value": "^2.0.3",
+            "has-values": "^0.1.4",
+            "isobject": "^2.0.0"
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+          "dependencies": {
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+              "resolved": "https://registry.npmjs.org/isobject/-/isobject-2.1.0.tgz",
+              "integrity": "sha1-8GVWEJaj8dou9GJy+BXIQNh+DIk=",
+              "dev": true,
+              "requires": {
+                "isarray": "1.0.0"
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+        "has-values": {
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+          "resolved": "https://registry.npmjs.org/has-values/-/has-values-0.1.4.tgz",
+          "integrity": "sha1-bWHeldkd/Km5oCCJrThL/49it3E=",
+          "dev": true
+        }
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       "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.2.2.tgz",
@@ -3531,6 +4804,18 @@
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+    "urix": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/urix/-/urix-0.1.0.tgz",
+      "integrity": "sha1-2pN/emLiH+wf0Y1Js1wpNQZ6bHI=",
+      "dev": true
+    },
+    "use": {
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+      "resolved": "https://registry.npmjs.org/use/-/use-3.1.1.tgz",
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+    },
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       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
@@ -3560,12 +4845,68 @@
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+      "resolved": "https://registry.npmjs.org/which-module/-/which-module-2.0.0.tgz",
+      "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=",
+      "dev": true
+    },
+    "wide-align": {
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+      "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.3.tgz",
+      "integrity": "sha512-QGkOQc8XL6Bt5PwnsExKBPuMKBxnGxWWW3fU55Xt4feHozMUhdUMaBCk290qpm/wG5u/RSKzwdAC4i51YigihA==",
+      "dev": true,
+      "requires": {
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     "wordwrap": {
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       "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
       "integrity": "sha1-J1hIEIkUVqQXHI0CJkQa3pDLyus=",
       "dev": true
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+    "wrap-ansi": {
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+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
+      "integrity": "sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=",
+      "dev": true,
+      "requires": {
+        "string-width": "^1.0.1",
+        "strip-ansi": "^3.0.1"
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+          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-1.0.0.tgz",
+          "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
+          "dev": true,
+          "requires": {
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+        "string-width": {
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+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
+          "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
+          "dev": true,
+          "requires": {
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+            "is-fullwidth-code-point": "^1.0.0",
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+        "strip-ansi": {
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+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+          "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
+          "dev": true,
+          "requires": {
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     "wrappy": {
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       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
@@ -3591,6 +4932,112 @@
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+    },
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+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
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+      "dev": true
+    },
+    "yargs": {
+      "version": "12.0.5",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-12.0.5.tgz",
+      "integrity": "sha512-Lhz8TLaYnxq/2ObqHDql8dX8CJi97oHxrjUcYtzKbbykPtVW9WB+poxI+NM2UIzsMgNCZTIf0AQwsjK5yMAqZw==",
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+        "decamelize": "^1.2.0",
+        "find-up": "^3.0.0",
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+        "os-locale": "^3.0.0",
+        "require-directory": "^2.1.1",
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+        "set-blocking": "^2.0.0",
+        "string-width": "^2.0.0",
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+        "y18n": "^3.2.1 || ^4.0.0",
+        "yargs-parser": "^11.1.1"
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+          "dev": true,
+          "requires": {
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+        "locate-path": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-3.0.0.tgz",
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+      }
     }
   }
 }
diff --git a/package.json b/package.json
index 8adbf58..11004a6 100644
--- a/package.json
+++ b/package.json
@@ -23,7 +23,7 @@
     "chai": "^4.1.2",
     "coveralls": "^3.0.0",
     "istanbul": "^0.4.5",
-    "mocha": "^5.0.0",
+    "mocha": "^6.0.0",
     "n3": "^0.8.5",
     "random-access-memory": "^3.0.0",
     "standard": "^12.0.0",