diff --git a/package.json b/package.json
index 581d1a2..6bb0e1d 100644
--- a/package.json
+++ b/package.json
@@ -7,7 +7,7 @@
     "test": "test"
   },
   "optionalDependencies": {
-    "pngquant-bin": "=0.1.7"
+    "pngquant-bin": "=2.0.0"
   },
   "devDependencies": {
     "mocha": "=1.7.3",