diff --git a/.travis.yml b/.travis.yml
index 947bc54..690909a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,8 +1,8 @@
 language: node_js
 node_js:
-  - "6"
   - "8"
   - "10"
+  - "12"
 notifications:
   email: false
 sudo: false
diff --git a/lib/validation/validators.js b/lib/validation/validators.js
index 4ec52b4..a747961 100644
--- a/lib/validation/validators.js
+++ b/lib/validation/validators.js
@@ -23,7 +23,7 @@ let validators = {
     },
 
     email(value) {
-        return value === '' || validators.regex(value, /^[a-z0-9._%+-]+@[a-z0-9.-]+\.[a-z]{2,6}$/i);
+        return value === '' || validators.regex(value, /^[a-z0-9._%+-]+@([a-z0-9]+([a-z0-9-]*[a-z0-9]+)?\.)+[a-z]{2,6}$/i);
     },
 
     minlength(value, length) {
diff --git a/package-lock.json b/package-lock.json
index bb2fdb4..f90aebc 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -87,15 +87,15 @@
       }
     },
     "acorn": {
-      "version": "6.2.1",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.2.1.tgz",
-      "integrity": "sha512-JD0xT5FCRDNyjDda3Lrg/IxFscp9q4tiYtxE1/nOzlKCk7hIRuYjhq1kCNkbPjMRMZuFq20HNQn1I9k8Oj0E+Q==",
+      "version": "7.1.0",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.1.0.tgz",
+      "integrity": "sha512-kL5CuoXA/dgxlBbVrflsflzQ3PAas7RYZB52NOm/6839iVYJgKMJ3cQJD+t2i5+qFa8h3MDpEOJiS64E8JLnSQ==",
       "dev": true
     },
     "acorn-jsx": {
-      "version": "5.0.1",
-      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.0.1.tgz",
-      "integrity": "sha512-HJ7CfNHrfJLlNTzIEUTj43LNWGkqpRLxm3YjAlcD0ACydk9XynzYsCBHxut+iqt+1aBXkx9UP/w/ZqMr13XIzg==",
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.1.0.tgz",
+      "integrity": "sha512-tMUqwBWfLFbJbizRmEcWSLw6HnFzfdJs2sOJEOwwtVPMoH/0Ay+E703oZz78VSXZiiDcZrQ5XKjPIUQixhmgVw==",
       "dev": true
     },
     "ajv": {
@@ -123,10 +123,13 @@
       "dev": true
     },
     "ansi-escapes": {
-      "version": "3.2.0",
-      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-3.2.0.tgz",
-      "integrity": "sha512-cBhpre4ma+U0T1oM5fXg7Dy1Jw7zzwv7lt/GoCpr+hDQJoYnKVPLL4dCvSEFMmQurOQvSrwT7SL/DAlhBI97RQ==",
-      "dev": true
+      "version": "4.3.0",
+      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-4.3.0.tgz",
+      "integrity": "sha512-EiYhwo0v255HUL6eDyuLrXEkTi7WwVCLAw+SeOQ7M7qdun1z1pum4DEm/nuqIVbPvi9RPPc9k9LbyBv6H0DwVg==",
+      "dev": true,
+      "requires": {
+        "type-fest": "^0.8.1"
+      }
     },
     "ansi-regex": {
       "version": "3.0.0",
@@ -332,12 +335,12 @@
       "dev": true
     },
     "cli-cursor": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/cli-cursor/-/cli-cursor-2.1.0.tgz",
-      "integrity": "sha1-s12sN2R5+sw+lHR9QdDQ9SOP/LU=",
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/cli-cursor/-/cli-cursor-3.1.0.tgz",
+      "integrity": "sha512-I/zHAwsKf9FqGoXM4WWRACob9+SNukZTd94DWF57E4toouRulbCxcUh6RKUEOQlYTHJnzkPMySvPNaaSLNfLZw==",
       "dev": true,
       "requires": {
-        "restore-cursor": "^2.0.0"
+        "restore-cursor": "^3.1.0"
       }
     },
     "cli-width": {
@@ -347,22 +350,44 @@
       "dev": true
     },
     "cliui": {
-      "version": "4.1.0",
-      "resolved": "https://registry.npmjs.org/cliui/-/cliui-4.1.0.tgz",
-      "integrity": "sha512-4FG+RSG9DL7uEwRUZXZn3SS34DiDPfzP0VOiEwtUWlE+AR2EIg+hSyvrIgUUfhdgR/UkAeW2QHgeP+hWrXs7jQ==",
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/cliui/-/cliui-5.0.0.tgz",
+      "integrity": "sha512-PYeGSEmmHM6zvoef2w8TPzlrnNpXIjTipYK780YswmIP9vjxmd6Y2a3CB2Ks6/AU8NHjZugXvo8w3oWM2qnwXA==",
       "dev": true,
       "requires": {
-        "string-width": "^2.1.1",
-        "strip-ansi": "^4.0.0",
-        "wrap-ansi": "^2.0.0"
+        "string-width": "^3.1.0",
+        "strip-ansi": "^5.2.0",
+        "wrap-ansi": "^5.1.0"
+      },
+      "dependencies": {
+        "ansi-regex": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
+          "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
+          "dev": true
+        },
+        "string-width": {
+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
+          "integrity": "sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==",
+          "dev": true,
+          "requires": {
+            "emoji-regex": "^7.0.1",
+            "is-fullwidth-code-point": "^2.0.0",
+            "strip-ansi": "^5.1.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "5.2.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
+          "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^4.1.0"
+          }
+        }
       }
     },
-    "code-point-at": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/code-point-at/-/code-point-at-1.1.0.tgz",
-      "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c=",
-      "dev": true
-    },
     "color-convert": {
       "version": "1.9.3",
       "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-1.9.3.tgz",
@@ -577,33 +602,28 @@
       "integrity": "sha1-rT/0yG7C0CkyL1oCw6mmBslbP1k=",
       "dev": true
     },
-    "end-of-stream": {
-      "version": "1.4.1",
-      "resolved": "https://registry.npmjs.org/end-of-stream/-/end-of-stream-1.4.1.tgz",
-      "integrity": "sha512-1MkrZNvWTKCaigbn+W15elq2BB/L22nqrSY5DKlo3X6+vclJm8Bb5djXJBmEX6fS3+zCh/F4VBK5Z2KxJt4s2Q==",
-      "dev": true,
-      "requires": {
-        "once": "^1.4.0"
-      }
-    },
     "es-abstract": {
-      "version": "1.13.0",
-      "resolved": "https://registry.npmjs.org/es-abstract/-/es-abstract-1.13.0.tgz",
-      "integrity": "sha512-vDZfg/ykNxQVwup/8E1BZhVzFfBxs9NqMzGcvIJrqg5k2/5Za2bWo40dK2J1pgLngZ7c+Shh8lwYtLGyrwPutg==",
+      "version": "1.16.2",
+      "resolved": "https://registry.npmjs.org/es-abstract/-/es-abstract-1.16.2.tgz",
+      "integrity": "sha512-jYo/J8XU2emLXl3OLwfwtuFfuF2w6DYPs+xy9ZfVyPkDcrauu6LYrw/q2TyCtrbc/KUdCiC5e9UajRhgNkVopA==",
       "dev": true,
       "requires": {
-        "es-to-primitive": "^1.2.0",
+        "es-to-primitive": "^1.2.1",
         "function-bind": "^1.1.1",
         "has": "^1.0.3",
+        "has-symbols": "^1.0.1",
         "is-callable": "^1.1.4",
         "is-regex": "^1.0.4",
-        "object-keys": "^1.0.12"
+        "object-inspect": "^1.7.0",
+        "object-keys": "^1.1.1",
+        "string.prototype.trimleft": "^2.1.0",
+        "string.prototype.trimright": "^2.1.0"
       }
     },
     "es-to-primitive": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/es-to-primitive/-/es-to-primitive-1.2.0.tgz",
-      "integrity": "sha512-qZryBOJjV//LaxLTV6UC//WewneB3LcXOL9NP++ozKVXsIIIpm/2c13UDiD9Jp2eThsecw9m3jPqDwTyobcdbg==",
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/es-to-primitive/-/es-to-primitive-1.2.1.tgz",
+      "integrity": "sha512-QCOllgZJtaUo9miYBcLChTUaHNjJF3PYs1VidD7AwiEj1kYxKeQTctLAezAOH5ZKRH0g2IgPn6KwB4IT8iRpvA==",
       "dev": true,
       "requires": {
         "is-callable": "^1.1.4",
@@ -651,47 +671,48 @@
       }
     },
     "eslint": {
-      "version": "5.16.0",
-      "resolved": "https://registry.npmjs.org/eslint/-/eslint-5.16.0.tgz",
-      "integrity": "sha512-S3Rz11i7c8AA5JPv7xAH+dOyq/Cu/VXHiHXBPOU1k/JAM5dXqQPt3qcrhpHSorXmrpu2g0gkIBVXAqCpzfoZIg==",
+      "version": "6.7.1",
+      "resolved": "https://registry.npmjs.org/eslint/-/eslint-6.7.1.tgz",
+      "integrity": "sha512-UWzBS79pNcsDSxgxbdjkmzn/B6BhsXMfUaOHnNwyE8nD+Q6pyT96ow2MccVayUTV4yMid4qLhMiQaywctRkBLA==",
       "dev": true,
       "requires": {
         "@babel/code-frame": "^7.0.0",
-        "ajv": "^6.9.1",
+        "ajv": "^6.10.0",
         "chalk": "^2.1.0",
         "cross-spawn": "^6.0.5",
         "debug": "^4.0.1",
         "doctrine": "^3.0.0",
-        "eslint-scope": "^4.0.3",
-        "eslint-utils": "^1.3.1",
-        "eslint-visitor-keys": "^1.0.0",
-        "espree": "^5.0.1",
+        "eslint-scope": "^5.0.0",
+        "eslint-utils": "^1.4.3",
+        "eslint-visitor-keys": "^1.1.0",
+        "espree": "^6.1.2",
         "esquery": "^1.0.1",
         "esutils": "^2.0.2",
         "file-entry-cache": "^5.0.1",
         "functional-red-black-tree": "^1.0.1",
-        "glob": "^7.1.2",
-        "globals": "^11.7.0",
+        "glob-parent": "^5.0.0",
+        "globals": "^12.1.0",
         "ignore": "^4.0.6",
         "import-fresh": "^3.0.0",
         "imurmurhash": "^0.1.4",
-        "inquirer": "^6.2.2",
-        "js-yaml": "^3.13.0",
+        "inquirer": "^7.0.0",
+        "is-glob": "^4.0.0",
+        "js-yaml": "^3.13.1",
         "json-stable-stringify-without-jsonify": "^1.0.1",
         "levn": "^0.3.0",
-        "lodash": "^4.17.11",
+        "lodash": "^4.17.14",
         "minimatch": "^3.0.4",
         "mkdirp": "^0.5.1",
         "natural-compare": "^1.4.0",
-        "optionator": "^0.8.2",
-        "path-is-inside": "^1.0.2",
+        "optionator": "^0.8.3",
         "progress": "^2.0.0",
         "regexpp": "^2.0.1",
-        "semver": "^5.5.1",
-        "strip-ansi": "^4.0.0",
-        "strip-json-comments": "^2.0.1",
+        "semver": "^6.1.2",
+        "strip-ansi": "^5.2.0",
+        "strip-json-comments": "^3.0.1",
         "table": "^5.2.3",
-        "text-table": "^0.2.0"
+        "text-table": "^0.2.0",
+        "v8-compile-cache": "^2.0.3"
       },
       "dependencies": {
         "ajv": {
@@ -705,13 +726,54 @@
             "json-schema-traverse": "^0.4.1",
             "uri-js": "^4.2.2"
           }
+        },
+        "ansi-regex": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
+          "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
+          "dev": true
+        },
+        "optionator": {
+          "version": "0.8.3",
+          "resolved": "https://registry.npmjs.org/optionator/-/optionator-0.8.3.tgz",
+          "integrity": "sha512-+IW9pACdk3XWmmTXG8m3upGUJst5XRGzxMRjXzAuJ1XnIFNvfhjjIuYkDvysnPQ7qzqVzLt78BCruntqRhWQbA==",
+          "dev": true,
+          "requires": {
+            "deep-is": "~0.1.3",
+            "fast-levenshtein": "~2.0.6",
+            "levn": "~0.3.0",
+            "prelude-ls": "~1.1.2",
+            "type-check": "~0.3.2",
+            "word-wrap": "~1.2.3"
+          }
+        },
+        "semver": {
+          "version": "6.3.0",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.0.tgz",
+          "integrity": "sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==",
+          "dev": true
+        },
+        "strip-ansi": {
+          "version": "5.2.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
+          "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^4.1.0"
+          }
+        },
+        "strip-json-comments": {
+          "version": "3.0.1",
+          "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-3.0.1.tgz",
+          "integrity": "sha512-VTyMAUfdm047mwKl+u79WIdrZxtFtn+nBxHeb844XBQ9uMNTuTHdx2hc5RiAJYqwTj3wc/xe5HLSdJSkJ+WfZw==",
+          "dev": true
         }
       }
     },
     "eslint-scope": {
-      "version": "4.0.3",
-      "resolved": "https://registry.npmjs.org/eslint-scope/-/eslint-scope-4.0.3.tgz",
-      "integrity": "sha512-p7VutNr1O/QrxysMo3E45FjYDTeXBy0iTltPFNSqKAIfjDSXC+4dj+qfyuD8bfAXrW/y6lW3O76VaYNPKfpKrg==",
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/eslint-scope/-/eslint-scope-5.0.0.tgz",
+      "integrity": "sha512-oYrhJW7S0bxAFDvWqzvMPRm6pcgcnWc4QnofCAqRTRfQC0JcwenzGglTtsLyIuuWFfkqDG9vz67cnttSd53djw==",
       "dev": true,
       "requires": {
         "esrecurse": "^4.1.0",
@@ -719,29 +781,29 @@
       }
     },
     "eslint-utils": {
-      "version": "1.4.0",
-      "resolved": "https://registry.npmjs.org/eslint-utils/-/eslint-utils-1.4.0.tgz",
-      "integrity": "sha512-7ehnzPaP5IIEh1r1tkjuIrxqhNkzUJa9z3R92tLJdZIVdWaczEhr3EbhGtsMrVxi1KeR8qA7Off6SWc5WNQqyQ==",
+      "version": "1.4.3",
+      "resolved": "https://registry.npmjs.org/eslint-utils/-/eslint-utils-1.4.3.tgz",
+      "integrity": "sha512-fbBN5W2xdY45KulGXmLHZ3c3FHfVYmKg0IrAKGOkT/464PQsx2UeIzfz1RmEci+KLm1bBaAzZAh8+/E+XAeZ8Q==",
       "dev": true,
       "requires": {
-        "eslint-visitor-keys": "^1.0.0"
+        "eslint-visitor-keys": "^1.1.0"
       }
     },
     "eslint-visitor-keys": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/eslint-visitor-keys/-/eslint-visitor-keys-1.0.0.tgz",
-      "integrity": "sha512-qzm/XxIbxm/FHyH341ZrbnMUpe+5Bocte9xkmFMzPMjRaZMcXww+MpBptFvtU+79L362nqiLhekCxCxDPaUMBQ==",
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/eslint-visitor-keys/-/eslint-visitor-keys-1.1.0.tgz",
+      "integrity": "sha512-8y9YjtM1JBJU/A9Kc+SbaOV4y29sSWckBwMHa+FGtVj5gN/sbnKDf6xJUl+8g7FAij9LVaP8C24DUiH/f/2Z9A==",
       "dev": true
     },
     "espree": {
-      "version": "5.0.1",
-      "resolved": "https://registry.npmjs.org/espree/-/espree-5.0.1.tgz",
-      "integrity": "sha512-qWAZcWh4XE/RwzLJejfcofscgMc9CamR6Tn1+XRXNzrvUSSbiAjGOI/fggztjIi7y9VLPqnICMIPiGyr8JaZ0A==",
+      "version": "6.1.2",
+      "resolved": "https://registry.npmjs.org/espree/-/espree-6.1.2.tgz",
+      "integrity": "sha512-2iUPuuPP+yW1PZaMSDM9eyVf8D5P0Hi8h83YtZ5bPc/zHYjII5khoixIUTMO794NOY8F/ThF1Bo8ncZILarUTA==",
       "dev": true,
       "requires": {
-        "acorn": "^6.0.7",
-        "acorn-jsx": "^5.0.0",
-        "eslint-visitor-keys": "^1.0.0"
+        "acorn": "^7.1.0",
+        "acorn-jsx": "^5.1.0",
+        "eslint-visitor-keys": "^1.1.0"
       }
     },
     "esprima": {
@@ -769,9 +831,9 @@
       }
     },
     "estraverse": {
-      "version": "4.2.0",
-      "resolved": "https://registry.npmjs.org/estraverse/-/estraverse-4.2.0.tgz",
-      "integrity": "sha1-De4/7TH81GlhjOc0IJn8GvoL2xM=",
+      "version": "4.3.0",
+      "resolved": "https://registry.npmjs.org/estraverse/-/estraverse-4.3.0.tgz",
+      "integrity": "sha512-39nnKffWz8xN1BU/2c79n9nB9HDzo0niYUqx6xyqUnyoAnQyyWpOTdZEeiCch8BBu515t4wp9ZmgVfVhn9EBpw==",
       "dev": true
     },
     "esutils": {
@@ -786,21 +848,6 @@
       "integrity": "sha1-Qa4u62XvpiJorr/qg6x9eSmbCIc=",
       "dev": true
     },
-    "execa": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/execa/-/execa-1.0.0.tgz",
-      "integrity": "sha512-adbxcyWV46qiHyvSp50TKt05tB4tK3HcmF7/nxfAdhnox83seTDbwnaqKO4sXRy7roHAIFqJP/Rw/AuEbX61LA==",
-      "dev": true,
-      "requires": {
-        "cross-spawn": "^6.0.0",
-        "get-stream": "^4.0.0",
-        "is-stream": "^1.1.0",
-        "npm-run-path": "^2.0.0",
-        "p-finally": "^1.0.0",
-        "signal-exit": "^3.0.0",
-        "strip-eof": "^1.0.0"
-      }
-    },
     "express": {
       "version": "4.17.1",
       "resolved": "https://registry.npmjs.org/express/-/express-4.17.1.tgz",
@@ -899,9 +946,9 @@
       "dev": true
     },
     "figures": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/figures/-/figures-2.0.0.tgz",
-      "integrity": "sha1-OrGi0qYsi/tDGgyUy3l6L84nyWI=",
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/figures/-/figures-3.1.0.tgz",
+      "integrity": "sha512-ravh8VRXqHuMvZt/d8GblBeqDMkdJMBdv/2KntFH+ra5MXkO7nxNKpzQ3n6QD/2da1kH0aWmNISdvhM7gl2gVg==",
       "dev": true,
       "requires": {
         "escape-string-regexp": "^1.0.5"
@@ -1043,15 +1090,6 @@
       "integrity": "sha1-6td0q+5y4gQJQzoGY2YCPdaIekE=",
       "dev": true
     },
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-      "version": "13.2.2",
-      "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.2.2.tgz",
-      "integrity": "sha512-WyEoxgyTD3w5XRpAQNYUB9ycVH/PQrToaTXdYXRdOXvEy1l19br+VJsc0vcO8PTGg5ro/l/GY7F/JMEBmI0BxA==",
+      "version": "13.3.0",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.3.0.tgz",
+      "integrity": "sha512-2eehun/8ALW8TLoIl7MVaRUrg+yCnenu8B4kBlRxj3GJGDKU1Og7sMXPNm1BYyM1DOJmTZ4YeN/Nwxv+8XJsUA==",
       "dev": true,
       "requires": {
-        "cliui": "^4.0.0",
+        "cliui": "^5.0.0",
         "find-up": "^3.0.0",
         "get-caller-file": "^2.0.1",
-        "os-locale": "^3.1.0",
         "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": "^13.0.0"
+        "yargs-parser": "^13.1.1"
       },
       "dependencies": {
         "ansi-regex": {
@@ -2983,9 +3010,9 @@
       }
     },
     "yargs-parser": {
-      "version": "13.0.0",
-      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.0.0.tgz",
-      "integrity": "sha512-w2LXjoL8oRdRQN+hOyppuXs+V/fVAYtpcrRxZuF7Kt/Oc+Jr2uAcVntaUTNT6w5ihoWfFDpNY8CPx1QskxZ/pw==",
+      "version": "13.1.1",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.1.tgz",
+      "integrity": "sha512-oVAVsHz6uFrg3XQheFII8ESO2ssAf9luWuAd6Wexsu4F3OtIW0o8IribPXYrD4WC24LWtPrJlGy87y5udK+dxQ==",
       "dev": true,
       "requires": {
         "camelcase": "^5.0.0",
@@ -2993,58 +3020,14 @@
       }
     },
     "yargs-unparser": {
-      "version": "1.5.0",
-      "resolved": "https://registry.npmjs.org/yargs-unparser/-/yargs-unparser-1.5.0.tgz",
-      "integrity": "sha512-HK25qidFTCVuj/D1VfNiEndpLIeJN78aqgR23nL3y4N0U/91cOAzqfHlF8n2BvoNDcZmJKin3ddNSvOxSr8flw==",
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/yargs-unparser/-/yargs-unparser-1.6.0.tgz",
+      "integrity": "sha512-W9tKgmSn0DpSatfri0nx52Joq5hVXgeLiqR/5G0sZNDoLZFOr/xjBUDcShCOGNsBnEMNo1KAMBkTej1Hm62HTw==",
       "dev": true,
       "requires": {
         "flat": "^4.1.0",
-        "lodash": "^4.17.11",
-        "yargs": "^12.0.5"
-      },
-      "dependencies": {
-        "get-caller-file": {
-          "version": "1.0.3",
-          "resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-1.0.3.tgz",
-          "integrity": "sha512-3t6rVToeoZfYSGd8YoLFR2DJkiQrIiUrGcjvFX2mDw3bn6k2OtwHN0TNCLbBO+w8qTvimhDkv+LSscbJY1vE6w==",
-          "dev": true
-        },
-        "require-main-filename": {
-          "version": "1.0.1",
-          "resolved": "https://registry.npmjs.org/require-main-filename/-/require-main-filename-1.0.1.tgz",
-          "integrity": "sha1-l/cXtp1IeE9fUmpsWqj/3aBVpNE=",
-          "dev": true
-        },
-        "yargs": {
-          "version": "12.0.5",
-          "resolved": "https://registry.npmjs.org/yargs/-/yargs-12.0.5.tgz",
-          "integrity": "sha512-Lhz8TLaYnxq/2ObqHDql8dX8CJi97oHxrjUcYtzKbbykPtVW9WB+poxI+NM2UIzsMgNCZTIf0AQwsjK5yMAqZw==",
-          "dev": true,
-          "requires": {
-            "cliui": "^4.0.0",
-            "decamelize": "^1.2.0",
-            "find-up": "^3.0.0",
-            "get-caller-file": "^1.0.1",
-            "os-locale": "^3.0.0",
-            "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 || ^4.0.0",
-            "yargs-parser": "^11.1.1"
-          }
-        },
-        "yargs-parser": {
-          "version": "11.1.1",
-          "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-11.1.1.tgz",
-          "integrity": "sha512-C6kB/WJDiaxONLJQnF8ccx9SEeoTTLek8RVbaOIsrAUS8VrBEXfmeSnCZxygc+XC2sNMBIwOOnfcxiynjHsVSQ==",
-          "dev": true,
-          "requires": {
-            "camelcase": "^5.0.0",
-            "decamelize": "^1.2.0"
-          }
-        }
+        "lodash": "^4.17.15",
+        "yargs": "^13.3.0"
       }
     }
   }
diff --git a/package.json b/package.json
index 9c39b08..8bb1877 100644
--- a/package.json
+++ b/package.json
@@ -16,7 +16,7 @@
   "author": "HMPO",
   "license": "MIT",
   "engines": {
-    "node": ">=4"
+    "node": ">=8"
   },
   "bugs": {
     "url": "https://github.com/UKHomeOffice/passports-form-wizard/issues"
@@ -28,7 +28,7 @@
     "debug": "^4.1.1",
     "deep-clone-merge": "^1.3.0",
     "hmpo-model": "^2.1.3",
-    "json5": "^2.1.0",
+    "json5": "^2.1.1",
     "moment": "^2.17.1",
     "underscore": "^1.8.2"
   },
@@ -37,13 +37,13 @@
   },
   "devDependencies": {
     "chai": "^4.1.2",
-    "eslint": "^5.16.0",
+    "eslint": "^6.7.1",
     "express": "^4.17.1",
     "istanbul": "^0.4.3",
-    "mocha": "^6.2.0",
-    "proxyquire": "^2.1.1",
+    "mocha": "^6.2.2",
+    "proxyquire": "^2.1.3",
     "reqres": "^2.0.0",
-    "sinon": "^7.4.0",
+    "sinon": "^7.5.0",
     "sinon-chai": "^3.0.0"
   }
 }
diff --git a/test/validation/spec.validators.js b/test/validation/spec.validators.js
index b6ca55e..c0809d1 100644
--- a/test/validation/spec.validators.js
+++ b/test/validation/spec.validators.js
@@ -69,7 +69,10 @@ describe('validators', () => {
                 '@.com',
                 '@com.',
                 'test.com@',
-                'test@test@test.com'
+                'test@test@test.com',
+                'test@.example.com',
+                'test@example-.com',
+                'test@-.com'
             ];
             _.each(inputs, i => {
                 it(testName(i), () => {
@@ -85,7 +88,8 @@ describe('validators', () => {
                 'test@example.com',
                 'test+suffix@gmail.com',
                 'test+suffix@digital.cabinet-office.gov.uk',
-                'test.suffix@digital.cabinet-office.gov.uk'
+                'test.suffix@digital.cabinet-office.gov.uk',
+                'test@0-0-0-0.0-0-0.com'
             ];
             _.each(inputs, i => {
                 it(testName(i), () => {