diff --git a/index.js b/index.js
index 90011f3..f70a7de 100644
--- a/index.js
+++ b/index.js
@@ -8,6 +8,9 @@ try {
   PromiseA = Promise;
 }
 var util = require('util');
+if (!util.promisify) {
+  util.promisify = PromiseA.promisify;
+}
 function promisifyAll(obj) {
   var aobj = {};
   Object.keys(obj).forEach(function (key) {
@@ -15,7 +18,7 @@ function promisifyAll(obj) {
   });
   return aobj;
 }
-var mkdirpAsync = util.promisify(require('mkdirp'));
+var mkdirpAsync = util.promisify(require('@root/mkdirp'));
 var path = require('path');
 var fs = require('fs');
 var readFileAsync = util.promisify(fs.readFile);
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..f727333
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,26 @@
+{
+  "name": "le-store-certbot",
+  "version": "2.2.2",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "@root/mkdirp": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/@root/mkdirp/-/mkdirp-1.0.0.tgz",
+      "integrity": "sha512-hxGAYUx5029VggfG+U9naAhQkoMSXtOeXtbql97m3Hi6/sQSRL/4khKZPyOF6w11glyCOU38WCNLu9nUcSjOfA=="
+    },
+    "pyconf": {
+      "version": "1.1.7",
+      "resolved": "https://registry.npmjs.org/pyconf/-/pyconf-1.1.7.tgz",
+      "integrity": "sha512-v4clh33m68sjtMsh8XMpjhGWb/MQODAYZ1y7ORG5Qv58UK25OddoB+oXyexgDkK8ttFui/lZm2sQDgA2Ftjfkw==",
+      "requires": {
+        "safe-replace": "^1.0.2"
+      }
+    },
+    "safe-replace": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/safe-replace/-/safe-replace-1.1.0.tgz",
+      "integrity": "sha512-9/V2E0CDsKs9DWOOwJH7jYpSl9S3N05uyevNjvsnDauBqRowBPOyot1fIvV5N2IuZAbYyvrTXrYFVG0RZInfFw=="
+    }
+  }
+}
diff --git a/package.json b/package.json
index be52b89..21db50d 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "le-store-certbot",
-  "version": "2.2.2",
+  "version": "2.2.3",
   "description": "The \"certbot\" storage strategy for Greenlock.js",
   "main": "index.js",
   "scripts": {
@@ -27,8 +27,8 @@
     "bluebird": "^3.5.1"
   },
   "dependencies": {
-    "mkdirp": "^0.5.1",
-    "pyconf": "^1.1.5",
-    "safe-replace": "^1.0.3"
+    "@root/mkdirp": "^1.0.0",
+    "pyconf": "^1.1.7",
+    "safe-replace": "^1.1.0"
   }
 }