diff --git a/package.json b/package.json
index 77abd36..e83c491 100644
--- a/package.json
+++ b/package.json
@@ -5,6 +5,6 @@
   "description": "Default dark theme for interface components",
   "repository": "https://github.com/atom/atom-dark-ui",
   "engines": {
-    "atom": ">26.0"
+    "atom": ">0.40.0"
   }
 }