diff --git a/package-lock.json b/package-lock.json
index f3a8d8e..72cf146 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -305,11 +305,6 @@
         "inherits": "~2.0.0"
       }
     },
-    "bluebird": {
-      "version": "3.5.4",
-      "resolved": "https://registry.npmjs.org/bluebird/-/bluebird-3.5.4.tgz",
-      "integrity": "sha512-FG+nFEZChJrbQ9tIccIfZJBz3J7mLrAhxakAbnrJWn8d7aKOC+LWifa0G+p4ZqKp4y13T7juYvdhq9NzKdsrjw=="
-    },
     "brace-expansion": {
       "version": "1.1.11",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
@@ -554,7 +549,6 @@
       "version": "1.1.3",
       "resolved": "https://registry.npmjs.org/define-properties/-/define-properties-1.1.3.tgz",
       "integrity": "sha512-3MqfYKj2lLzdMSf8ZIZE/V+Zuy+BgD6f164e8K2w7dgnpKArBDerGYpM46IYYcjnkdPNMjPk9A6VFB8+3SKlXQ==",
-      "dev": true,
       "requires": {
         "object-keys": "^1.0.12"
       }
@@ -641,7 +635,6 @@
       "version": "1.13.0",
       "resolved": "https://registry.npmjs.org/es-abstract/-/es-abstract-1.13.0.tgz",
       "integrity": "sha512-vDZfg/ykNxQVwup/8E1BZhVzFfBxs9NqMzGcvIJrqg5k2/5Za2bWo40dK2J1pgLngZ7c+Shh8lwYtLGyrwPutg==",
-      "dev": true,
       "requires": {
         "es-to-primitive": "^1.2.0",
         "function-bind": "^1.1.1",
@@ -655,7 +648,6 @@
       "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==",
-      "dev": true,
       "requires": {
         "is-callable": "^1.1.4",
         "is-date-object": "^1.0.1",
@@ -1168,8 +1160,7 @@
     "function-bind": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/function-bind/-/function-bind-1.1.1.tgz",
-      "integrity": "sha512-yIovAzMX49sF8Yl58fSCWJ5svSLuaibPxXQJFLmBObTuCr0Mf1KiPopGM9NiFjiYBCbfaa2Fh6breQ6ANVTI0A==",
-      "dev": true
+      "integrity": "sha512-yIovAzMX49sF8Yl58fSCWJ5svSLuaibPxXQJFLmBObTuCr0Mf1KiPopGM9NiFjiYBCbfaa2Fh6breQ6ANVTI0A=="
     },
     "functional-red-black-tree": {
       "version": "1.0.1",
@@ -1277,7 +1268,6 @@
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/has/-/has-1.0.3.tgz",
       "integrity": "sha512-f2dvO0VU6Oej7RkWJGrehjbzMAjFp5/VKPp5tTpWIV4JHHZK1/BxbFRtf/siA2SWTe09caDmVtYYzWEIbBS4zw==",
-      "dev": true,
       "requires": {
         "function-bind": "^1.1.1"
       }
@@ -1291,8 +1281,7 @@
     "has-symbols": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/has-symbols/-/has-symbols-1.0.0.tgz",
-      "integrity": "sha1-uhqPGvKg/DllD1yFA2dwQSIGO0Q=",
-      "dev": true
+      "integrity": "sha1-uhqPGvKg/DllD1yFA2dwQSIGO0Q="
     },
     "has-unicode": {
       "version": "2.0.1",
@@ -1452,14 +1441,12 @@
     "is-callable": {
       "version": "1.1.4",
       "resolved": "https://registry.npmjs.org/is-callable/-/is-callable-1.1.4.tgz",
-      "integrity": "sha512-r5p9sxJjYnArLjObpjA4xu5EKI3CuKHkJXMhT7kwbpUyIFD1n5PMAsoPvWnvtZiNz7LjkYDRZhd7FlI0eMijEA==",
-      "dev": true
+      "integrity": "sha512-r5p9sxJjYnArLjObpjA4xu5EKI3CuKHkJXMhT7kwbpUyIFD1n5PMAsoPvWnvtZiNz7LjkYDRZhd7FlI0eMijEA=="
     },
     "is-date-object": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/is-date-object/-/is-date-object-1.0.1.tgz",
-      "integrity": "sha1-mqIOtq7rv/d/vTPnTKAbM1gdOhY=",
-      "dev": true
+      "integrity": "sha1-mqIOtq7rv/d/vTPnTKAbM1gdOhY="
     },
     "is-fullwidth-code-point": {
       "version": "1.0.0",
@@ -1480,7 +1467,6 @@
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/is-regex/-/is-regex-1.0.4.tgz",
       "integrity": "sha1-VRdIm1RwkbCTDglWVM7SXul+lJE=",
-      "dev": true,
       "requires": {
         "has": "^1.0.1"
       }
@@ -1495,7 +1481,6 @@
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/is-symbol/-/is-symbol-1.0.2.tgz",
       "integrity": "sha512-HS8bZ9ox60yCJLH9snBpIwv9pYUAkcuLhSA1oero1UB5y9aiQpRA8y2ex945AOtCZL1lJDeIk3G5LthswI46Lw==",
-      "dev": true,
       "requires": {
         "has-symbols": "^1.0.0"
       }
@@ -1874,8 +1859,7 @@
     "object-keys": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/object-keys/-/object-keys-1.1.1.tgz",
-      "integrity": "sha512-NuAESUOUMrlIXOfHKzD6bpPu3tYt3xvjNdRIQ+FeT0lNb4K8WR70CaDxhuNguS2XG+GjkyMwOzsN5ZktImfhLA==",
-      "dev": true
+      "integrity": "sha512-NuAESUOUMrlIXOfHKzD6bpPu3tYt3xvjNdRIQ+FeT0lNb4K8WR70CaDxhuNguS2XG+GjkyMwOzsN5ZktImfhLA=="
     },
     "object.assign": {
       "version": "4.1.0",
@@ -1913,6 +1897,15 @@
         "has": "^1.0.1"
       }
     },
+    "object.getownpropertydescriptors": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/object.getownpropertydescriptors/-/object.getownpropertydescriptors-2.0.3.tgz",
+      "integrity": "sha1-h1jIRvW0B62rDyNuCYbxSwUcqhY=",
+      "requires": {
+        "define-properties": "^1.1.2",
+        "es-abstract": "^1.5.1"
+      }
+    },
     "once": {
       "version": "1.4.0",
       "resolved": "https://registry.npmjs.org/once/-/once-1.4.0.tgz",
@@ -2817,6 +2810,15 @@
       "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
       "dev": true
     },
+    "util.promisify": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/util.promisify/-/util.promisify-1.0.0.tgz",
+      "integrity": "sha512-i+6qA2MPhvoKLuxnJNpXAGhg7HphQOSUq2LKMZD0m15EiskXUkMvKdF4Uui0WYeCUGea+o2cw/ZuwehtfsrNkA==",
+      "requires": {
+        "define-properties": "^1.1.2",
+        "object.getownpropertydescriptors": "^2.0.3"
+      }
+    },
     "uuid": {
       "version": "3.3.2",
       "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.2.tgz",
diff --git a/package.json b/package.json
index 7a8f49e..71dfc1f 100644
--- a/package.json
+++ b/package.json
@@ -23,9 +23,9 @@
   },
   "homepage": "https://github.com/linonetwo/zazu-firefox-bookmarks#readme",
   "dependencies": {
-    "bluebird": "^3.5.4",
     "fast-fuzzy": "^1.8.5",
-    "traverse": "^0.6.6"
+    "traverse": "^0.6.6",
+    "util.promisify": "^1.0.0"
   },
   "devDependencies": {
     "@types/node": "^12.0.0",
diff --git a/src/bookmarkParser/index.js b/src/bookmarkParser/index.js
index e8556e4..8d3e3e9 100644
--- a/src/bookmarkParser/index.js
+++ b/src/bookmarkParser/index.js
@@ -1,12 +1,12 @@
 // @ts-check
-const Promise = require('bluebird');
+const promisify = require('util.promisify');
 const os = require('os');
 const fs = require('fs');
 const path = require('path');
 const { exec } = require('child_process');
 
-const readdirAsync = Promise.promisify(fs.readdir);
-const execAsync = Promise.promisify(exec);
+const readdirAsync = promisify(fs.readdir);
+const execAsync = promisify(exec);
 
 function bookmarkParser(version = 'default', pluginContext) {
   let filePath;
@@ -36,6 +36,13 @@ function bookmarkParser(version = 'default', pluginContext) {
             shellCommandToReadData,
           });
           return execAsync(shellCommandToReadData)
+            .then(({ stdout }) => {
+              if (!stdout) throw new Error('No stdout after exec');
+              if (typeof stdout === 'string') {
+                return stdout;
+              }
+              throw new Error(`Bad stdout type ${typeof stdout}`);
+            })
             .then(JSON.parse)
             .then(content => ({ filename, content }));
         });