diff --git a/sequelize/sequelize.d.ts b/sequelize/sequelize.d.ts
index fda6503a59..a7a085e205 100644
--- a/sequelize/sequelize.d.ts
+++ b/sequelize/sequelize.d.ts
@@ -5666,7 +5666,7 @@ declare module "sequelize" {
         /**
          * Validator Interface
          */
-        interface Validator extends IValidatorStatic {
+        interface Validator extends ValidatorJS.ValidatorStatic {
 
             notEmpty( str : string ) : boolean;
             len( str : string, min : number, max : number ) : boolean;
diff --git a/validator/validator-tests.ts b/validator/validator-tests.ts
index c5a55f59c2..8afabc2099 100644
--- a/validator/validator-tests.ts
+++ b/validator/validator-tests.ts
@@ -1,108 +1,190 @@
-/// <reference path="./validator.d.ts" />
+/// <reference path='./validator.d.ts' />
 
-import validator = require("validator");
+import * as validator from 'validator';
 
+let any: any;
 
-validator.extend("isTest", function(str) {
-  return !str;
-});
+/**************
+ * Validators *
+ **************/
 
-validator.equals("abc", "Abc");
+{
+  let result: boolean;
 
-validator.contains("foo", "foobar");
+  result = validator.contains('sample', 'sample');
 
-validator.matches("foobar", "foo/i");
+  result = validator.equals('sample', 'sample');
 
-validator.isEmail("sample");
+  result = validator.isAfter('sample');
+  result = validator.isAfter('sample', new Date());
 
-validator.isURL("sample");
+  result = validator.isAlpha('sample');
 
-validator.isFQDN("sample");
+  result = validator.isAlphanumeric('sample');
 
-validator.isMACAddress("sample");
+  result = validator.isAscii('sample');
 
-validator.isIP("sample");
+  result = validator.isBase64('sample');
 
-validator.isAlpha("sample");
+  result = validator.isBefore('sample');
+  result = validator.isBefore('sample', new Date());
 
-validator.isNumeric("sample");
+  result = validator.isBoolean('sample');
 
-validator.isAlphanumeric("sample");
+  let isByteLengthOptions: ValidatorJS.IsByteLengthOptions;
+  result = validator.isByteLength('sample', isByteLengthOptions);
+  result = validator.isByteLength('sample', 0);
+  result = validator.isByteLength('sample', 0, 42);
 
-validator.isBase64("sample");
+  result = validator.isCreditCard('sample');
 
-validator.isHexadecimal("sample");
+  let isCurrencyOptions: ValidatorJS.IsCurrencyOptions;
+  result = validator.isCurrency('sample');
+  result = validator.isCurrency('sample', isCurrencyOptions);
 
-validator.isHexColor("sample");
+  result = validator.isDate('sample');
 
-validator.isLowercase("sample");
+  result = validator.isDecimal('sample');
 
-validator.isUppercase("sample");
+  result = validator.isDivisibleBy('sample', 2);
 
-validator.isInt("sample");
+  let isEmailOptions: ValidatorJS.IsEmailOptions;
+  result = validator.isEmail('sample');
+  result = validator.isEmail('sample', isEmailOptions);
 
-validator.isFloat("sample");
+  let isFQDNOptions: ValidatorJS.IsFQDNOptions;
+  result = validator.isFQDN('sample');
+  result = validator.isFQDN('sample', isFQDNOptions);
 
-validator.isDivisibleBy("sample", 2);
+  let isFloatOptions: ValidatorJS.IsFloatOptions;
+  result = validator.isFloat('sample');
+  result = validator.isFloat('sample', isFloatOptions);
 
-validator.isNull("sample");
+  result = validator.isFullWidth('sample');
 
-validator.isLength("sample", 3, 5);
+  result = validator.isHalfWidth('sample');
 
-validator.isByteLength("sample", 3);
+  result = validator.isHexColor('sample');
 
-validator.isUUID("sample");
+  result = validator.isHexadecimal('sample');
 
-validator.isDate("sample");
+  result = validator.isIP('sample');
+  result = validator.isIP('sample', 6);
 
-validator.isAfter("sample");
+  result = validator.isISBN('sample');
+  result = validator.isISBN('sample', 13);
 
-validator.isBefore("sample");
+  result = validator.isISIN('sample');
 
-validator.isIn("sample", []);
+  result = validator.isISO8601('sample');
 
-validator.isCreditCard("sample");
+  result = validator.isIn('sample', []);
 
-validator.isISBN("sample");
+  let isIntOptions: ValidatorJS.IsIntOptions;
+  result = validator.isInt('sample');
+  result = validator.isInt('sample', isIntOptions);
 
-validator.isJSON("sample");
+  result = validator.isJSON('sample');
 
-validator.isMultibyte("sample");
+  let isLengthOptions: ValidatorJS.IsLengthOptions;
+  result = validator.isLength('sample', isLengthOptions);
+  result = validator.isLength('sample', 3);
+  result = validator.isLength('sample', 3, 5);
 
-validator.isAscii("sample");
+  result = validator.isLowercase('sample');
 
-validator.isFullWidth("sample");
+  result = validator.isMACAddress('sample');
 
-validator.isHalfWidth("sample");
+  result = validator.isMobilePhone('sample', 'en-US');
 
-validator.isVariableWidth("sample");
+  result = validator.isMongoId('sample');
 
-validator.isSurrogatePair("sample");
+  result = validator.isMultibyte('sample');
 
-validator.isMongoId("sample");
+  result = validator.isNull('sample');
 
-validator.toString(123);
+  result = validator.isNumeric('sample');
 
-validator.toDate(1225);
+  result = validator.isSurrogatePair('sample');
 
-validator.toFloat('011');
+  let isURLOptions: ValidatorJS.IsURLOptions;
+  result = validator.isURL('sample');
+  result = validator.isURL('sample', isURLOptions);
 
-validator.toInt('aa');
+  result = validator.isUUID('sample');
+  result = validator.isUUID('sample', 5);
 
-validator.toBoolean('yes!');
+  result = validator.isUppercase('sample');
 
-validator.trim('  triming  ');
+  result = validator.isVariableWidth('sample');
 
-validator.ltrim('  triming  ');
+  result = validator.isWhitelisted('sample', 'abc');
+  result = validator.isWhitelisted('sample', ['a', 'b', 'c']);
 
-validator.rtrim('  triming  ');
+  result = validator.matches('foobar', 'foo/i');
+  result = validator.matches('foobar', 'foo', 'i');
+}
 
-validator.escape('<script>');
+/**************
+ * Sanitizers *
+ **************/
 
-validator.stripLow('\x7Ffoo\x02');
+{
+  let result: string;
 
-validator.whitelist('ab', 'abcdef');
+  result = validator.blacklist('sample', 'abc');
 
-validator.blacklist('abc', 'abcdef');
+  result = validator.escape('sample');
 
-validator.normalizeEmail('!');
+  result = validator.ltrim('sample');
+  result = validator.ltrim('sample', ' ');
+
+  let normalizeEmailOptions: ValidatorJS.NormalizeEmailOptions;
+  result = validator.normalizeEmail('sample');
+  result = validator.normalizeEmail('sample', normalizeEmailOptions);
+
+  result = validator.rtrim('sample');
+  result = validator.rtrim('sample', ' ');
+
+  result = validator.stripLow('sample');
+  result = validator.stripLow('sample', true);
+}
+
+{
+  let result: boolean;
+
+  result = validator.toBoolean(any);
+  result = validator.toBoolean(any, true);
+}
+
+{
+  let result: Date;
+
+  result = validator.toDate(any);
+}
+
+{
+  let result: number;
+
+  result = validator.toFloat(any);
+
+  result = validator.toInt(any);
+  result = validator.toInt(any, 10);
+}
+
+{
+  let result: string;
+
+  result = validator.toString(any);
+
+  result = validator.trim('sample');
+  result = validator.trim('sample', ' ');
+
+  result = validator.whitelist('sample', 'abc');
+}
+
+/**************
+ * Extensions *
+ **************/
+
+validator.extend<(str: string, options: {}) => boolean>('isTest', (str: any, options: {}) => !str);
diff --git a/validator/validator.d.ts b/validator/validator.d.ts
index 2b29efac0c..f590ce849e 100644
--- a/validator/validator.d.ts
+++ b/validator/validator.d.ts
@@ -1,193 +1,292 @@
-// Type definitions for validator.js v3.22.1
+// Type definitions for validator.js v4.5.1
 // Project: https://github.com/chriso/validator.js
-// Definitions by: tgfjt <https://github.com/tgfjt>
+// Definitions by: tgfjt <https://github.com/tgfjt>, Ilya Mochalov <https://github.com/chrootsu>
 // Definitions: https://github.com/borisyankov/DefinitelyTyped
 
-// options for #isURL
-interface IURLoptions {
-  protocols?: string[]
-  require_tld?: boolean
-  require_protocol?: boolean
-  allow_underscores?: boolean
-}
+declare namespace ValidatorJS {
+  interface ValidatorStatic {
 
-// options for isFQDN
-interface IFQDNoptions {
-  require_tld?: boolean
-  allow_underscores?: boolean
-}
+    /**************
+     * Validators *
+     **************/
 
-// options for normalizeEmail
-interface IEmailoptions {
-  lowercase?: boolean
-}
+    // check if the string contains the seed.
+    contains(str: string, elem: any): boolean;
 
-// callback type for #extend
-interface IExtendCallback {
-  (argv: string): any
-}
+    // check if the string matches the comparison.
+    equals(str: string, comparison: any): boolean;
 
-// return function for #extend
-interface IExtendFunc {
-  (argv: string): boolean
-}
+    // check if the string is a date that's after the specified date (defaults to now).
+    isAfter(str: string, date?: Date): boolean;
 
-interface IValidatorStatic {
-  // add your own validators
-  extend(name: string, fn: IExtendCallback): IExtendFunc;
+    // check if the string contains only letters (a-zA-Z).
+    isAlpha(str: string): boolean;
 
-  // check if the string matches the comparison.
-  equals(str: string, comparison: any): boolean;
+    // check if the string contains only letters and numbers.
+    isAlphanumeric(str: string): boolean;
 
-  // check if the string contains the seed.
-  contains(str: string, elem: any): boolean;
+    // check if the string contains ASCII chars only.
+    isAscii(str: string): boolean;
 
-  // check if string matches the pattern.
-  matches(str: string, pattern: any, modifiers?: string): boolean;
+    // check if a string is base64 encoded.
+    isBase64(str: string): boolean;
 
-  // check if the string is an email.
-  isEmail(str: string): boolean;
+    // check if the string is a date that's before the specified date.
+    isBefore(str: string, date?: Date): boolean;
 
-  // check if the string is an URL.
-  isURL(str: string, options?: IURLoptions): boolean;
+    // check if a string is a boolean.
+    isBoolean(str: string): boolean;
 
-  // check if the string is a fully qualified domain name (e.g. domain.com).
-  isFQDN(str: string, options?: IFQDNoptions): boolean;
+    // check if the string's length (in bytes) falls in a range.
+    isByteLength(str: string, options: IsByteLengthOptions): boolean;
+    isByteLength(str: string, min: number, max?: number): boolean;
 
-  // check if the string is a MAC address.
-  isMACAddress(str: string): boolean;
+    // check if the string is a credit card.
+    isCreditCard(str: string): boolean;
 
-  // check if the string is an IP (version 4 or 6).
-  isIP(str: string, version?: number): boolean;
+    // check if the string is a valid currency amount.
+    isCurrency(str: string, options?: IsCurrencyOptions): boolean;
 
-  // check if the string contains only letters (a-zA-Z).
-  isAlpha(str: string): boolean;
+    // check if the string is a date.
+    isDate(str: string): boolean;
 
-  // check if the string contains only numbers.
-  isNumeric(str: string): boolean;
+    // check if the string represents a decimal number, such as 0.1, .3, 1.1, 1.00003, 4.0, etc.
+    isDecimal(str: string): boolean;
 
-  // check if the string contains only letters and numbers.
-  isAlphanumeric(str: string): boolean;
+    // check if the string is a number that's divisible by another.
+    isDivisibleBy(str: string, number: number): boolean;
 
-  // check if a string is base64 encoded.
-  isBase64(str: string): boolean;
+    // check if the string is an email.
+    isEmail(str: string, options?: IsEmailOptions): boolean;
 
-  // check if the string is a hexadecimal number.
-  isHexadecimal(str: string): boolean;
+    // check if the string is a fully qualified domain name (e.g. domain.com).
+    isFQDN(str: string, options?: IsFQDNOptions): boolean;
 
-  // check if the string is a hexadecimal color.
-  isHexColor(str: string): boolean;
+    // check if the string is a float.
+    isFloat(str: string, options?: IsFloatOptions): boolean;
 
-  // check if the string is lowercase.
-  isLowercase(str: string): boolean;
+    // check if the string contains any full-width chars.
+    isFullWidth(str: string): boolean;
 
-  // check if the string is uppercase.
-  isUppercase(str: string): boolean;
+    // check if the string contains any half-width chars.
+    isHalfWidth(str: string): boolean;
 
-  // check if the string is an integer.
-  isInt(str: string): boolean;
+    // check if the string is a hexadecimal color.
+    isHexColor(str: string): boolean;
 
-  // check if the string is a float.
-  isFloat(str: string): boolean;
+    // check if the string is a hexadecimal number.
+    isHexadecimal(str: string): boolean;
 
-  // check if the string is a number that's divisible by another.
-  isDivisibleBy(str: string, number: number): boolean;
+    // check if the string is an IP (version 4 or 6).
+    isIP(str: string, version?: number): boolean;
 
-  // check if the string is null.
-  isNull(str: string): boolean;
+    // check if the string is an ISBN (version 10 or 13).
+    isISBN(str: string, version?: number): boolean;
 
-  // check if the string's length falls in a range. Note: this function takes into account surrogate pairs.
-  isLength(str: string, min: number, max?: number): boolean;
+    // check if the string is an ISIN (https://en.wikipedia.org/wiki/International_Securities_Identification_Number)
+    // (stock/security identifier).
+    isISIN(str: string): boolean;
 
-  // check if the string's length (in bytes) falls in a range.
-  isByteLength(str: string, min: number, max?: number): boolean;
+    // check if the string is a valid ISO 8601 (https://en.wikipedia.org/wiki/ISO_8601) date.
+    isISO8601(str: string): boolean;
 
-  // check if the string is a UUID (version 3, 4 or 5).
-  isUUID(str: string, version?: number): boolean;
+    // check if the string is in a array of allowed values.
+    isIn(str: string, values: any[]): boolean;
 
-  // check if the string is a date.
-  isDate(str: string): boolean;
+    // check if the string is an integer.
+    isInt(str: string, options?: IsIntOptions): boolean;
 
-  // check if the string is a date that's after the specified date (defaults to now).
-  isAfter(str: string, date?: Date): boolean;
+    // check if the string is valid JSON (note: uses JSON.parse).
+    isJSON(str: string): boolean;
 
-  // check if the string is a date that's before the specified date.
-  isBefore(str: string, date?: Date): boolean;
+    // check if the string's length falls in a range.
+    // Note: this function takes into account surrogate pairs.
+    isLength(str: string, options: IsLengthOptions): boolean;
+    isLength(str: string, min: number, max?: number): boolean;
 
-  // check if the string is in a array of allowed values.
-  isIn(str: string, values: any[]): boolean;
+    // check if the string is lowercase.
+    isLowercase(str: string): boolean;
 
-  // check if the string is a credit card.
-  isCreditCard(str: string): boolean;
+    // check if the string is a MAC address.
+    isMACAddress(str: string): boolean;
 
-  // check if the string is an ISBN (version 10 or 13).
-  isISBN(str: string, version?: number): boolean;
+    // check if the string is a mobile phone number, (locale is one of ['zh-CN', 'zh-TW', 'en-ZA', 'en-AU', 'en-HK',
+    // 'pt-PT', 'fr-FR', 'el-GR', 'en-GB', 'en-US', 'en-ZM', 'ru-RU', 'nb-NO', 'nn-NO', 'vi-VN', 'en-NZ', 'en-IN']).
+    isMobilePhone(str: string, locale: string): boolean;
 
-  // check if the string is valid JSON (note: uses JSON.parse).
-  isJSON(str: string): boolean;
+    // check if the string is a valid hex-encoded representation of a MongoDB ObjectId
+    // (http://docs.mongodb.org/manual/reference/object-id/).
+    isMongoId(str: string): boolean;
 
-  // check if the string contains one or more multibyte chars.
-  isMultibyte(str: string): boolean;
+    // check if the string contains one or more multibyte chars.
+    isMultibyte(str: string): boolean;
 
-  // check if the string contains ASCII chars only.
-  isAscii(str: string): boolean;
+    // check if the string is null.
+    isNull(str: string): boolean;
 
-  // check if the string contains any full-width chars.
-  isFullWidth(str: string): boolean;
+    // check if the string contains only numbers.
+    isNumeric(str: string): boolean;
 
-  // check if the string contains any half-width chars.
-  isHalfWidth(str: string): boolean;
+    // check if the string contains any surrogate pairs chars.
+    isSurrogatePair(str: string): boolean;
 
-  // check if the string contains a mixture of full and half-width chars.
-  isVariableWidth(str: string): boolean;
+    // check if the string is an URL.
+    isURL(str: string, options?: IsURLOptions): boolean;
 
-  // check if the string contains any surrogate pairs chars.
-  isSurrogatePair(str: string): boolean;
+    // check if the string is a UUID (version 3, 4 or 5).
+    isUUID(str: string, version?: number): boolean;
 
-  // check if the string is a valid hex-encoded representation of a MongoDB ObjectId.
-  isMongoId(str: string): boolean;
+    // check if the string is uppercase.
+    isUppercase(str: string): boolean;
 
-  // convert the input to a string.
-  toString(input: any): string;
+    // check if the string contains a mixture of full and half-width chars.
+    isVariableWidth(str: string): boolean;
 
-  // convert the input to a date, or null if the input is not a date.
-  toDate(input: any): any; // Date or null
+    // checks characters if they appear in the whitelist.
+    isWhitelisted(str: string, chars: string|string[]): boolean;
 
-  // convert the input to a float, or NaN if the input is not a float.
-  toFloat(input:any): number; // number or NaN
+    // check if string matches the pattern.
+    matches(str: string, pattern: any, modifiers?: string): boolean;
 
-  // convert the input to an integer, or NaN if the input is not an integer.
-  toInt(input:any, radix?: number): number; // number or NaN
+    /**************
+     * Sanitizers *
+     **************/
 
-  // convert the input to a boolean.
-  toBoolean(input:any, strict?: boolean): boolean;
+    // remove characters that appear in the blacklist. The characters are used in a RegExp and so you will need
+    // to escape some chars, e.g. blacklist(input, '\\[\\]').
+    blacklist(input: string, chars: string): string;
 
-  // trim characters (whitespace by default) from both sides of the input.
-  trim(input: any, chars?: string): string;
+    // replace <, >, &, ', " and / with HTML entities.
+    escape(input: string): string;
 
-  // trim characters from the left-side of the input.
-  ltrim(input: any, chars?: string): string;
+    // trim characters from the left-side of the input.
+    ltrim(input: any, chars?: string): string;
 
-  // trim characters from the right-side of the input.
-  rtrim(input: any, chars?: string): string;
+    // canonicalize an email address.
+    normalizeEmail(email: string, options?: NormalizeEmailOptions): string;
 
-  // replace <, >, &, ' and " with HTML entities.
-  escape(input: string): string;
+    // trim characters from the right-side of the input.
+    rtrim(input: any, chars?: string): string;
 
-  // remove characters with a numerical value < 32 and 127
-  stripLow(input: string, keep_new_lines?: boolean): string;
+    // remove characters with a numerical value < 32 and 127, mostly control characters. If keep_new_lines is true,
+    // newline characters are preserved (\n and \r, hex 0xA and 0xD). Unicode-safe in JavaScript.
+    stripLow(input: string, keep_new_lines?: boolean): string;
 
-  // remove characters that do not appear in the whitelist.
-  whitelist(input: string, chars: string): string;
+    // convert the input to a boolean. Everything except for '0', 'false' and '' returns true. In strict mode only '1'
+    // and 'true' return true.
+    toBoolean(input: any, strict?: boolean): boolean;
 
-  // remove characters that appear in the blacklist.
-  blacklist(input: string, chars: string): string;
+    // convert the input to a date, or null if the input is not a date.
+    toDate(input: any): Date; // Date or null
 
-  // canonicalize an email address.
-  normalizeEmail(email: string, options?: IEmailoptions): string;
+    // convert the input to a float, or NaN if the input is not a float.
+    toFloat(input: any): number; // number or NaN
+
+    // convert the input to an integer, or NaN if the input is not an integer.
+    toInt(input: any, radix?: number): number; // number or NaN
+
+    // convert the input to a string.
+    toString(input: any): string;
+
+    // trim characters (whitespace by default) from both sides of the input.
+    trim(input: any, chars?: string): string;
+
+    // remove characters that do not appear in the whitelist. The characters are used in a RegExp and so you will
+    // need to escape some chars, e.g. whitelist(input, '\\[\\]').
+    whitelist(input: string, chars: string): string;
+
+    /**************
+     * Extensions *
+     **************/
+
+    // add your own validators.
+    // Note: that the first argument will be automatically coerced to a string.
+    extend<T extends Function>(name: string, fn: T): void;
+  }
+
+  // options for IsByteLength
+  interface IsByteLengthOptions {
+    min?: number;
+    max?: number;
+  }
+
+  // options for IsCurrency
+  interface IsCurrencyOptions {
+    symbol?: string;
+    require_symbol?: boolean;
+    allow_space_after_symbol?: boolean;
+    symbol_after_digits?: boolean;
+    allow_negatives?: boolean;
+    parens_for_negatives?: boolean;
+    negative_sign_before_digits?: boolean;
+    negative_sign_after_digits?: boolean;
+    allow_negative_sign_placeholder?: boolean;
+    thousands_separator?: string;
+    decimal_separator?: string;
+    allow_space_after_digits?: boolean;
+  }
+
+  // options for isEmail
+  interface IsEmailOptions {
+    allow_display_name?: boolean;
+    allow_utf8_local_part?: boolean;
+    require_tld?: boolean;
+  }
+
+  // options for isFQDN
+  interface IsFQDNOptions {
+    require_tld?: boolean;
+    allow_underscores?: boolean;
+    allow_trailing_dot?: boolean;
+  }
+
+  // options for IsFloat
+  interface IsFloatOptions {
+    min?: number;
+    max?: number;
+  }
+
+  // options for IsInt
+  interface IsIntOptions {
+    min?: number;
+    max?: number;
+  }
+
+  // options for IsLength
+  interface IsLengthOptions {
+    min?: number;
+    max?: number;
+  }
+
+  // options for isURL
+  interface IsURLOptions {
+    protocols?: string[];
+    require_tld?: boolean;
+    require_protocol?: boolean;
+    require_valid_protocol?: boolean;
+    allow_underscores?: boolean;
+    host_whitelist?: boolean;
+    host_blacklist?: boolean;
+    allow_trailing_dot?: boolean;
+    allow_protocol_relative_urls?: boolean;
+  }
+
+  // options for normalizeEmail
+  interface NormalizeEmailOptions {
+    lowercase?: boolean;
+    remove_dots?: boolean;
+    remove_extension?: boolean;
+  }
 }
 
 declare module "validator" {
-  var validator: IValidatorStatic;
+  let validator: ValidatorJS.ValidatorStatic;
+  namespace validator {}
   export = validator;
 }
+
+// deprecated interfaces for backward compatibility, please use ValidatorJS.* instead the ones
+interface IValidatorStatic extends ValidatorJS.ValidatorStatic {}
+interface IURLoptions extends ValidatorJS.IsURLOptions {}
+interface IFQDNoptions extends ValidatorJS.IsFQDNOptions {}
+interface IEmailoptions extends ValidatorJS.NormalizeEmailOptions {}