diff --git a/README.md b/README.md
index 7d9676d..d892cd5 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,7 @@
 # tasker-lib
 
+[![Greenkeeper badge](https://badges.greenkeeper.io/pnann/tasker-lib.svg)](https://greenkeeper.io/)
+
 > A simple library for defining and executing JavaScript task trees.
 
 [![Build Status](https://travis-ci.org/pnann/tasker-lib.svg)](https://travis-ci.org/pnann/tasker-lib)
diff --git a/package.json b/package.json
index ac5f745..e854c3a 100644
--- a/package.json
+++ b/package.json
@@ -30,11 +30,11 @@
   },
   "typings": "tasker-lib.d.ts",
   "devDependencies": {
-    "@types/jest": "^20.0.7",
-    "coveralls": "^2.13.1",
-    "jest": "^20.0.4",
-    "rollup": "^0.47.6",
-    "ts-jest": "^20.0.10",
+    "@types/jest": "^22.2.3",
+    "coveralls": "^3.0.1",
+    "jest": "^22.4.3",
+    "rollup": "^0.58.2",
+    "ts-jest": "^22.4.5",
     "typescript": "^2.4.2"
   }
 }