diff --git a/package.json b/package.json
index 6c3176b..de40a73 100644
--- a/package.json
+++ b/package.json
@@ -15,9 +15,6 @@
       "density-buoyancy-common",
       "mobius"
     ],
-    "phet-io": {
-      "compareDesignedAPIChanges": true
-    },
     "preload": [
       "../sherpa/lib/poly-decomp-0.3.0.js",
       "../sherpa/lib/p2-0.7.1.js",