diff --git a/dynamic-theme/manifest.json b/dynamic-theme/manifest.json
index f98a0027..a5ae5b45 100644
--- a/dynamic-theme/manifest.json
+++ b/dynamic-theme/manifest.json
@@ -11,7 +11,9 @@
     "scripts": ["background.js"]
   },
   "version": "1.0",
-  "gecko": {
+  "applications": {
+    "gecko": {
       "strict_min_version": "55.0a2"
+    }
   }
 }