diff --git a/package.json b/package.json
index dbd9ccc..9eb4940 100644
--- a/package.json
+++ b/package.json
@@ -50,10 +50,10 @@
     "url": "https://github.com/lukeapage/pngjs2/issues"
   },
   "devDependencies": {
-    "buffer-equal": "0.0.1",
+    "buffer-equal": "1.0.0",
     "connect": "^3.4.0",
     "eslint": "^1.0.0",
-    "istanbul": "^0.3.17",
+    "istanbul": "^0.4.1",
     "phantomjs": "^1.9.17",
     "serve-static": "^1.10.0",
     "tap-dot": "^1.0.0",