diff --git a/index.js b/index.js
index c06df9c..f6938d4 100644
--- a/index.js
+++ b/index.js
@@ -10,12 +10,14 @@ try {
 } catch(e) {
   PromiseA = global.Promise;
 }
-var util = require('util');
+if (!PromiseA.promisify) {
+  PromiseA.promisify = require('util');
+}
 function promisifyAllSelf(obj) {
   if (obj.__promisified) { return obj; }
   Object.keys(obj).forEach(function (key) {
     if ('function' === typeof obj[key] && !/Async$/.test(key)) {
-      obj[key + 'Async'] = util.promisify(obj[key]);
+      obj[key + 'Async'] = PromiseA.promisify(obj[key]);
     }
   });
   obj.__promisified = true;
@@ -30,7 +32,7 @@ function promisifyAllStore(obj) {
       // wrap just in case it's synchronous (or improperly throws)
       p = function (opts) { return PromiseA.resolve().then(function () { obj[key](opts); }); };
     } else {
-      p = util.promisify(obj[key]);
+      p = PromiseA.promisify(obj[key]);
     }
     // internal backwards compat
     obj[key + 'Async'] = p;
diff --git a/package-lock.json b/package-lock.json
index 8af3e20..3600942 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "greenlock",
-  "version": "2.7.13",
+  "version": "2.7.14",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -18,9 +18,9 @@
       }
     },
     "acme-v2": {
-      "version": "1.7.5",
-      "resolved": "https://registry.npmjs.org/acme-v2/-/acme-v2-1.7.5.tgz",
-      "integrity": "sha512-jru7mOO/gT/ZfpRJo7m8QDWy2xea7A0xZsR9zlvMfm0+kQsE8DI3DJXOVN/1iMeQOMCHp0sZVqYRqB42XAKAdw==",
+      "version": "1.7.6",
+      "resolved": "https://registry.npmjs.org/acme-v2/-/acme-v2-1.7.6.tgz",
+      "integrity": "sha512-k4ZlTI8txU7AweKny2MK9EAJTSCSu9ueodrv3v91r2NckTuHRu8ELzN3LbP5zlTrb2coNFay4uLcA3u4ona67A==",
       "requires": {
         "@coolaj86/urequest": "^1.3.6",
         "rsa-compat": "^2.0.6"
diff --git a/package.json b/package.json
index de71a13..3fc66fb 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "greenlock",
-  "version": "2.7.13",
+  "version": "2.7.14",
   "description": "Let's Encrypt for node.js on npm",
   "main": "index.js",
   "files": [
@@ -39,7 +39,7 @@
   },
   "dependencies": {
     "acme": "^1.3.0",
-    "acme-v2": "^1.7.5",
+    "acme-v2": "^1.7.6",
     "cert-info": "^1.5.1",
     "keypairs": "^1.2.14",
     "le-challenge-dns": "^3.0.3",