diff --git a/README.md b/README.md
index 0d9c453..e358da2 100644
--- a/README.md
+++ b/README.md
@@ -111,7 +111,7 @@ sign({
 })
 ```
 
-From release v0.4.0-beta, [Bluebird] promises are introduced for better async method calls; the following is also available for use.
+From release v0.4.0-beta, Promises are introduced for better async method calls; the following is also available for use.
 
 ```javascript
 var signAsync = require('electron-osx-sign').signAsync
@@ -306,7 +306,7 @@ flat({
 })
 ```
 
-From release v0.4.0-beta, [Bluebird] promises are introduced for better async method calls; the following is also available for use.
+From release v0.4.0-beta, Promises are introduced for better async method calls; the following is also available for use.
 
 ```javascript
 var flatAsync = require('electron-osx-sign').flatAsync
@@ -441,7 +441,6 @@ ok 10 app signed
 - [electron-packager] - Package your electron app in OS executables (.app, .exe, etc) via JS or CLI
 - [electron-builder] - A complete solution to package and build a ready for distribution Electron app with “auto update” support out of the box
 
-[Bluebird]: https://github.com/petkaantonov/bluebird
 [Electron]: https://github.com/electron/electron
 [electron-builder]: https://github.com/electron-userland/electron-builder
 [electron-packager]: https://github.com/electron-userland/electron-packager
diff --git a/package.json b/package.json
index f2941f4..5d30a48 100644
--- a/package.json
+++ b/package.json
@@ -18,7 +18,6 @@
   },
   "homepage": "https://github.com/electron-userland/electron-osx-sign",
   "dependencies": {
-    "bluebird": "^3.5.0",
     "compare-version": "^0.1.2",
     "debug": "^4.1.1",
     "isbinaryfile": "^4.0.6",
diff --git a/util.js b/util.js
index 1e50834..d5292a0 100644
--- a/util.js
+++ b/util.js
@@ -5,12 +5,10 @@
 'use strict'
 
 const child = require('child_process')
-const { promises: fs } = require('fs')
-const path = require('path')
-
-const Promise = require('bluebird')
 const debug = require('debug')
 const { isBinaryFile } = require('isbinaryfile')
+const { promises: fs } = require('fs')
+const path = require('path')
 
 /**
  * This callback is used across signing and flattening.
diff --git a/yarn.lock b/yarn.lock
index bf2d655..b8c2571 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -177,11 +177,6 @@ bcrypt-pbkdf@^1.0.0:
   dependencies:
     tweetnacl "^0.14.3"
 
-bluebird@^3.5.0:
-  version "3.5.5"
-  resolved "https://registry.yarnpkg.com/bluebird/-/bluebird-3.5.5.tgz#a8d0afd73251effbbd5fe384a77d73003c17a71f"
-  integrity sha512-5am6HnnfN+urzt4yfg7IgTbotDjIT/u8AJpEt0sIU9FtXfVeezXAPKswrG+xKUCOYAINpSdgZVDU6QFh+cuH3w==
-
 brace-expansion@^1.1.7:
   version "1.1.11"
   resolved "https://registry.yarnpkg.com/brace-expansion/-/brace-expansion-1.1.11.tgz#3c7fcbf529d87226f3d2f52b966ff5271eb441dd"