diff --git a/package.json b/package.json
index dc159998..6da5aff5 100644
--- a/package.json
+++ b/package.json
@@ -57,7 +57,7 @@
   "devDependencies": {
     "async": "^1.5.0",
     "coveralls": "^2.11.4",
-    "exif-reader": "1.0.0",
+    "exif-reader": "^1.0.0",
     "icc": "^0.0.2",
     "istanbul": "^0.4.0",
     "mocha": "^2.3.4",
diff --git a/test/bench/package.json b/test/bench/package.json
index 7c5e1ddf..76075b22 100644
--- a/test/bench/package.json
+++ b/test/bench/package.json
@@ -12,10 +12,10 @@
     "benchmark": "^1.0.0",
     "gm": "^1.21.0",
     "imagemagick": "^0.1.3",
-    "imagemagick-native": "^1.8.0",
+    "imagemagick-native": "elad/node-imagemagick-native",
     "jimp": "^0.2.19",
     "lwip": "^0.0.8",
-    "semver": "^5.0.3"
+    "semver": "^5.1.0"
   },
   "license": "Apache-2.0",
   "engines": {
diff --git a/test/bench/parallel.js b/test/bench/parallel.js
index 0c6725d4..d0543e31 100644
--- a/test/bench/parallel.js
+++ b/test/bench/parallel.js
@@ -1,5 +1,7 @@
 'use strict';
 
+process.env.UV_THREADPOOL_SIZE = 64;
+
 var assert = require('assert');
 var async = require('async');
 
@@ -15,7 +17,7 @@ var timer = setInterval(function() {
   console.dir(sharp.counters());
 }, 100);
 
-async.mapSeries([1, 1, 2, 4, 8, 16, 32, 64, 128], function(parallelism, next) {
+async.mapSeries([1, 1, 2, 4, 8, 16, 32, 64], function(parallelism, next) {
   var start = new Date().getTime();
   async.times(parallelism,
     function(id, callback) {