diff --git a/types/koa-passport/index.d.ts b/types/koa-passport/index.d.ts
index d7d63cee96..0a011a06d5 100644
--- a/types/koa-passport/index.d.ts
+++ b/types/koa-passport/index.d.ts
@@ -1,6 +1,7 @@
-// Type definitions for koa-passport 2.x
+// Type definitions for koa-passport 4.0
 // Project: https://github.com/rkusa/koa-passport
 // Definitions by: horiuchi <https://github.com/horiuchi>
+//                 Tomek Łaziuk <https://github.com/tlaziuk>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.3
 
@@ -12,52 +13,51 @@
 
  =============================================== */
 
-import * as Koa from "koa";
+import {
+    Middleware,
+} from "koa";
+
+import * as passport from "passport";
+
 declare module "koa" {
     interface Context {
-        authInfo?: any;
-        user?: any;
-
-        login(user: any): Promise<void>;
-        login(user: any, options: Object): Promise<void>;
-        logIn(user: any): Promise<void>;
-        logIn(user: any, options: Object): Promise<void>;
+        login(user: any, options?: any): Promise<void>;
+        logIn: Context["login"];
 
         logout(): void;
-        logOut(): void;
+        logOut: Context["logout"];
 
         isAuthenticated(): boolean;
         isUnauthenticated(): boolean;
     }
 }
 
-import * as passport from "passport";
-
-interface KoaPassport {
-    use(strategy: passport.Strategy): this;
-    use(name: string, strategy: passport.Strategy): this;
-    unuse(name: string): this;
-    framework(fw: passport.Framework): this;
-    initialize(options?: { userProperty: string; }): Koa.Middleware;
-    session(options?: { pauseStream: boolean; }): Koa.Middleware;
-
-    authenticate(strategy: string, callback?: Function): Koa.Middleware;
-    authenticate(strategy: string, options: Object, callback?: Function): Koa.Middleware;
-    authenticate(strategies: string[], callback?: Function): Koa.Middleware;
-    authenticate(strategies: string[], options: Object, callback?: Function): Koa.Middleware;
-    authorize(strategy: string, callback?: Function): Koa.Middleware;
-    authorize(strategy: string, options: Object, callback?: Function): Koa.Middleware;
-    authorize(strategies: string[], callback?: Function): Koa.Middleware;
-    authorize(strategies: string[], options: Object, callback?: Function): Koa.Middleware;
-    serializeUser(fn: (user: any, done: (err: any, id: any) => void) => void): void;
-    deserializeUser(fn: (id: any, done: (err: any, user: any) => void) => void): void;
-    transformAuthInfo(fn: (info: any, done: (err: any, info: any) => void) => void): void;
-}
-declare const koaPassport: KoaPassport;
-
 declare namespace KoaPassport {
-    interface Profile extends passport.Profile { }
-    interface Framework extends passport.Framework { }
+    class KoaPassport {
+        use(strategy: passport.Strategy): this;
+        use(name: string, strategy: passport.Strategy): this;
+        unuse(name: string): this;
+        framework(fw: passport.Framework): this;
+        initialize(options?: { userProperty: string; }): Middleware;
+        session(options?: { pauseStream: boolean; }): Middleware;
+
+        authenticate(strategy: string | string[], callback?: (...args: any[]) => any): Middleware;
+        authenticate(strategy: string | string[], options: passport.AuthenticateOptions, callback?: (...args: any[]) => any): Middleware;
+        authorize(strategy: string | string[], callback?: (...args: any[]) => any): Middleware;
+        authorize(strategy: string | string[], options: any, callback?: (...args: any[]) => any): Middleware;
+
+        serializeUser: passport.Passport["serializeUser"];
+        deserializeUser: passport.Passport["deserializeUser"];
+        transformAuthInfo: passport.Passport["transformAuthInfo"];
+    }
+
+    interface Static extends KoaPassport {
+        KoaPassport: typeof KoaPassport;
+        Passport: typeof passport.Passport;
+        Authenticator: Static["Passport"];
+    }
 }
 
+declare const koaPassport: KoaPassport.Static;
+
 export = koaPassport;
diff --git a/types/koa-passport/koa-passport-tests.ts b/types/koa-passport/koa-passport-tests.ts
index eebb67a3b1..42827a85ba 100644
--- a/types/koa-passport/koa-passport-tests.ts
+++ b/types/koa-passport/koa-passport-tests.ts
@@ -2,13 +2,11 @@ import * as Koa from 'koa';
 import * as passport from 'koa-passport';
 
 const app = new Koa();
-let ctx: Koa.Context;
-
 
 app.use(passport.initialize());
 app.use(passport.session());
 
-app.use(async (ctx: Koa.Context): Promise<void> => {
+app.use(async (ctx): Promise<void> => {
     ctx.isAuthenticated();
     ctx.isUnauthenticated();
     ctx.login({});
@@ -16,8 +14,7 @@ app.use(async (ctx: Koa.Context): Promise<void> => {
     ctx.state.user;
 });
 
-
-app.use(async (ctx: Koa.Context, next: () => Promise<any>) => {
+app.use(async (ctx, next) => {
     return passport.authenticate('local', (user: any, info: any, status: any) => {
         if (user === false) {
             ctx.status = 401;
@@ -36,3 +33,4 @@ app.use(
     })
 );
 
+class KoaPasspordChild extends passport.KoaPassport { }
diff --git a/types/koa-passport/tslint.json b/types/koa-passport/tslint.json
index a41bf5d19a..f93cf8562a 100644
--- a/types/koa-passport/tslint.json
+++ b/types/koa-passport/tslint.json
@@ -1,79 +1,3 @@
 {
-    "extends": "dtslint/dt.json",
-    "rules": {
-        "adjacent-overload-signatures": false,
-        "array-type": false,
-        "arrow-return-shorthand": false,
-        "ban-types": false,
-        "callable-types": false,
-        "comment-format": false,
-        "dt-header": false,
-        "eofline": false,
-        "export-just-namespace": false,
-        "import-spacing": false,
-        "interface-name": false,
-        "interface-over-type-literal": false,
-        "jsdoc-format": false,
-        "max-line-length": false,
-        "member-access": false,
-        "new-parens": false,
-        "no-any-union": false,
-        "no-boolean-literal-compare": false,
-        "no-conditional-assignment": false,
-        "no-consecutive-blank-lines": false,
-        "no-construct": false,
-        "no-declare-current-package": false,
-        "no-duplicate-imports": false,
-        "no-duplicate-variable": false,
-        "no-empty-interface": false,
-        "no-for-in-array": false,
-        "no-inferrable-types": false,
-        "no-internal-module": false,
-        "no-irregular-whitespace": false,
-        "no-mergeable-namespace": false,
-        "no-misused-new": false,
-        "no-namespace": false,
-        "no-object-literal-type-assertion": false,
-        "no-padding": false,
-        "no-redundant-jsdoc": false,
-        "no-redundant-jsdoc-2": false,
-        "no-redundant-undefined": false,
-        "no-reference-import": false,
-        "no-relative-import-in-test": false,
-        "no-self-import": false,
-        "no-single-declare-module": false,
-        "no-string-throw": false,
-        "no-unnecessary-callback-wrapper": false,
-        "no-unnecessary-class": false,
-        "no-unnecessary-generics": false,
-        "no-unnecessary-qualifier": false,
-        "no-unnecessary-type-assertion": false,
-        "no-useless-files": false,
-        "no-var-keyword": false,
-        "no-var-requires": false,
-        "no-void-expression": false,
-        "no-trailing-whitespace": false,
-        "object-literal-key-quotes": false,
-        "object-literal-shorthand": false,
-        "one-line": false,
-        "one-variable-per-declaration": false,
-        "only-arrow-functions": false,
-        "prefer-conditional-expression": false,
-        "prefer-const": false,
-        "prefer-declare-function": false,
-        "prefer-for-of": false,
-        "prefer-method-signature": false,
-        "prefer-template": false,
-        "radix": false,
-        "semicolon": false,
-        "space-before-function-paren": false,
-        "space-within-parens": false,
-        "strict-export-declare-modifiers": false,
-        "trim-file": false,
-        "triple-equals": false,
-        "typedef-whitespace": false,
-        "unified-signatures": false,
-        "void-return": false,
-        "whitespace": false
-    }
+    "extends": "dtslint/dt.json"
 }