diff --git a/plugin/manifest.json b/plugin/manifest.json
index b9be12e..4eb10c3 100644
--- a/plugin/manifest.json
+++ b/plugin/manifest.json
@@ -1,7 +1,7 @@
 {
   "name": "GoogleMeetTimer",
   "version": "1.0.1",
-  "manifest_version": 4,
+  "manifest_version": 3,
   "description": "Timer on Google Meet.",
   "action": {
     "default_popup": "popup.html"