diff --git a/src/manifest.json b/src/manifest.json
index af590e9..e14bd21 100644
--- a/src/manifest.json
+++ b/src/manifest.json
@@ -2,7 +2,7 @@
   "manifest_version": 2,
   "name": "Ultrawidify",
   "description": "Aspect ratio fixer for Youtube, Netflix and possibly more. Supports automatic aspect ratio detection on certain sites.",
-  "version": "4.0.0",
+  "version": "4.0.1a1",
   "applications": {
     "gecko": {
       "id": "{cf02b1a7-a01a-4e37-a609-516a283f1ed3}"