diff --git a/README.md b/README.md
index cdd3646..b71baf8 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,4 @@
+
+[![Greenkeeper badge](https://badges.greenkeeper.io/michielbdejong/node-letsencrypt.svg)](https://greenkeeper.io/)
+
 Deprecated. I personally use my [get-lets-encrypt-servers](https://www.npmjs.com/package/get-lets-encrypt-servers) npm package nowadays, which is a simple configuration wrapper around @coolaj86's excellent [greenlock](https://www.npmjs.com/package/greenlock) package. For production use, you probably want to use [greenlock](https://www.npmjs.com/package/greenlock) directly.
diff --git a/package.json b/package.json
index 33ad730..d60c311 100644
--- a/package.json
+++ b/package.json
@@ -3,17 +3,17 @@
   "version": "0.0.6",
   "main": "./lib/acme.js",
   "dependencies": {
-    "async": "^1.3.0",
-    "node-forge": "^0.6.34"
+    "async": "^2.6.2",
+    "node-forge": "^0.8.2"
   },
   "optionalDependencies": {
-    "ursa": "^0.8.5"
+    "ursa": "^0.9.4"
   },
   "devDependencies": {
-    "jshint": "2.5.X",
-    "mocha": "1.18.X",
-    "chai": "1.9.X",
-    "supertest": "0.12.X"
+    "jshint": "~2.10.2",
+    "mocha": "~6.1.4",
+    "chai": "~4.2.0",
+    "supertest": "~4.0.2"
   },
   "description": "Automated Certificate Management Environment (ACME)",
   "keywords": [