diff --git a/package.json b/package.json
index 7a47d3735f51202040c63f5bb4890ac129ee83a6..e9137fb49261403f8957fb48b08ca10748286882 100644
--- a/package.json
+++ b/package.json
@@ -11,6 +11,6 @@
   "engines": {
     "firefox": ">=38.0a1",
     "fennec": ">=38.0a1",
-    "seamonkey": ">=2.0a1"
+    "seamonkey": ">=2.0a1 <=2.46"
   }
 }