diff --git a/package.json b/package.json
index 7e6d5733a..a02d163e7 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "mobx",
-  "version": "5.1.1",
+  "version": "5.1.2",
   "description": "Simple, scalable state management.",
   "main": "lib/mobx.js",
   "umd:main": "lib/mobx.umd.js",