diff --git a/project/bgms/theme.mp3 b/project/bgms/theme.mp3
new file mode 100644
index 0000000..3d4eeb3
Binary files /dev/null and b/project/bgms/theme.mp3 differ
diff --git a/project/bgms/theme.opus b/project/bgms/theme.opus
deleted file mode 100644
index 00b2488..0000000
Binary files a/project/bgms/theme.opus and /dev/null differ
diff --git a/project/data.js b/project/data.js
index b277d60..1100d93 100644
--- a/project/data.js
+++ b/project/data.js
@@ -905,7 +905,7 @@ var data_a1e2fb4a_e986_4524_b0da_9b7ba7c0874d =
 			"Halbmond.opus",
 			"ed.opus",
 			"op.opus",
-			"theme.opus"
+			"theme.mp3"
 		],
 		"sounds": [
 			"aiy010000010.opus",
@@ -1061,7 +1061,7 @@ var data_a1e2fb4a_e986_4524_b0da_9b7ba7c0874d =
 			"饰品",
 			"饰品"
 		],
-		"startBgm": "theme.opus",
+		"startBgm": "theme.mp3",
 		"styles": {
 			"startBackground": "project/images/background.webp",
 			"startVerticalBackground": "project/images/backgroundvertical.webp",