diff --git a/package-lock.json b/package-lock.json
index bb2be01..83f81fe 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -153,28 +153,17 @@
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@@ -184,6 +173,15 @@
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@@ -1282,6 +1373,16 @@
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+      "integrity": "sha1-uDVx+k2MJbguIxsG46MFXeTKGkc=",
+      "dev": true
+    },
     "to-object-path": {
       "version": "0.3.0",
       "resolved": "https://registry.npmjs.org/to-object-path/-/to-object-path-0.3.0.tgz",
@@ -3573,6 +3773,12 @@
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+    "trim-right": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/trim-right/-/trim-right-1.0.1.tgz",
+      "integrity": "sha1-yy4SAwZ+DI3h9hQJS5/kVwTqYAM=",
+      "dev": true
+    },
     "tslib": {
       "version": "1.9.3",
       "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.9.3.tgz",
@@ -3610,13 +3816,13 @@
       "dev": true
     },
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-      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.4.9.tgz",
-      "integrity": "sha512-8CJsbKOtEbnJsTyv6LE6m6ZKniqMiFWmm9sRbopbkGs3gMPPfd3Fh8iIA4Ykv5MgaTbqHr4BaoGLJLZNhsrW1Q==",
+      "version": "3.5.2",
+      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.5.2.tgz",
+      "integrity": "sha512-imog1WIsi9Yb56yRt5TfYVxGmnWs3WSGU73ieSOlMVFwhJCA9W8fqFFMMj4kgDqiS/80LGdsYnWL7O9UcjEBlg==",
       "dev": true,
       "optional": true,
       "requires": {
-        "commander": "~2.17.1",
+        "commander": "~2.19.0",
         "source-map": "~0.6.1"
       },
       "dependencies": {
@@ -3767,6 +3973,7 @@
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       "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
       "integrity": "sha512-HxJdYWq1MTIQbJ3nw0cqssHoTNU267KlrDuGZ1WYlxDStUtKUhOaJmh112/TZmHxxUfuJqPXSOm7tDyas0OSIQ==",
+      "dev": true,
       "requires": {
         "isexe": "^2.0.0"
       }
@@ -3774,7 +3981,8 @@
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       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/which-module/-/which-module-2.0.0.tgz",
-      "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho="
+      "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=",
+      "dev": true
     },
     "wide-align": {
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@@ -3795,6 +4003,7 @@
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       "resolved": "http://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"
@@ -3803,12 +4012,14 @@
         "ansi-regex": {
           "version": "2.1.1",
           "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
-          "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8="
+          "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
+          "dev": true
         },
         "is-fullwidth-code-point": {
           "version": "1.0.0",
           "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-1.0.0.tgz",
           "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
+          "dev": true,
           "requires": {
             "number-is-nan": "^1.0.0"
           }
@@ -3817,6 +4028,7 @@
           "version": "1.0.2",
           "resolved": "http://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
           "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
+          "dev": true,
           "requires": {
             "code-point-at": "^1.0.0",
             "is-fullwidth-code-point": "^1.0.0",
@@ -3827,6 +4039,7 @@
           "version": "3.0.1",
           "resolved": "http://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
           "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
+          "dev": true,
           "requires": {
             "ansi-regex": "^2.0.0"
           }
@@ -3850,39 +4063,8 @@
     "y18n": {
       "version": "3.2.1",
       "resolved": "https://registry.npmjs.org/y18n/-/y18n-3.2.1.tgz",
-      "integrity": "sha1-bRX7qITAhnnA136I53WegR4H+kE="
-    },
-    "yallist": {
-      "version": "2.1.2",
-      "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
-      "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI="
-    },
-    "yargs": {
-      "version": "11.1.0",
-      "resolved": "http://registry.npmjs.org/yargs/-/yargs-11.1.0.tgz",
-      "integrity": "sha512-NwW69J42EsCSanF8kyn5upxvjp5ds+t3+udGBeTbFnERA+lF541DDpMawzo4z6W/QrzNM18D+BPMiOBibnFV5A==",
-      "requires": {
-        "cliui": "^4.0.0",
-        "decamelize": "^1.1.1",
-        "find-up": "^2.1.0",
-        "get-caller-file": "^1.0.1",
-        "os-locale": "^2.0.0",
-        "require-directory": "^2.1.1",
-        "require-main-filename": "^1.0.1",
-        "set-blocking": "^2.0.0",
-        "string-width": "^2.0.0",
-        "which-module": "^2.0.0",
-        "y18n": "^3.2.1",
-        "yargs-parser": "^9.0.2"
-      }
-    },
-    "yargs-parser": {
-      "version": "9.0.2",
-      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-9.0.2.tgz",
-      "integrity": "sha1-nM9qQ0YP5O1Aqbto9I1DuKaMwHc=",
-      "requires": {
-        "camelcase": "^4.1.0"
-      }
+      "integrity": "sha1-bRX7qITAhnnA136I53WegR4H+kE=",
+      "dev": true
     },
     "yargs-unparser": {
       "version": "1.5.0",
diff --git a/package.json b/package.json
index a3ed25e..3b58acc 100644
--- a/package.json
+++ b/package.json
@@ -27,7 +27,7 @@
     "eslint": "^5.15.3",
     "eslint-plugin-json": "^1.2.0",
     "eslint-plugin-nodeca": "^1.0.3",
-    "istanbul": "^0.4.5",
+    "istanbul": "^1.1.0-alpha.1",
     "mocha": "^6.0.2",
     "semver": "^6.0.0",
     "sinon": "^7.3.1",
@@ -47,7 +47,7 @@
     "bin"
   ],
   "engines": {
-    "node": ">= 4.2.1 < 5"
+    "node": ">= 8"
   },
   "repository": {
     "type": "git",