diff --git a/bin/evening_detective_server b/bin/evening_detective_server
index f6b86f3..cdb0d8b 100755
Binary files a/bin/evening_detective_server and b/bin/evening_detective_server differ
diff --git a/internal/services/file_service/service.go b/internal/services/file_service/service.go
index 5765c3e..587e7a4 100644
--- a/internal/services/file_service/service.go
+++ b/internal/services/file_service/service.go
@@ -96,6 +96,9 @@ func (s *FileService) UploadFile(
 	// Категория по содержимому (сырой sniff): text/* и octet-stream не
 	// проходят вообще, расширение должно соответствовать категории.
 	sniffed := http.DetectContentType(data)
+	if ext == ".mp3" && isMP3(data) {
+		sniffed = "audio/mpeg"
+	}
 	fileType := contentTypeCategory(sniffed)
 	if fileType == "" || fileType != file_storage.FileType(filename) {
 		return "", "", ErrInvalidContentType
@@ -117,6 +120,13 @@ func (s *FileService) UploadFile(
 	return storedName, fileType, nil
 }
 
+// isMP3 распознаёт MP3 без необязательного ID3-тега по заголовку MPEG-фрейма.
+func isMP3(data []byte) bool {
+	return len(data) >= 4 && data[0] == 0xff && data[1]&0xe0 == 0xe0 &&
+		data[1]&0x18 != 0x08 && data[1]&0x06 != 0 &&
+		data[2]&0xf0 != 0 && data[2]&0xf0 != 0xf0 && data[2]&0x0c != 0x0c
+}
+
 // contentTypeCategory возвращает категорию по sniffed-типу:
 // application/pdf → pdf; image/* → image; audio/* и application/ogg → audio;
 // всё остальное (text/*, application/octet-stream и пр.) → "".
diff --git a/internal/services/file_service/service_test.go b/internal/services/file_service/service_test.go
index 258d4e5..cfae99c 100644
--- a/internal/services/file_service/service_test.go
+++ b/internal/services/file_service/service_test.go
@@ -71,6 +71,7 @@ func TestUploadFileValid(t *testing.T) {
 		{"photo.PNG", []byte("\x89PNG\r\n\x1a\ncontent"), "image", ".png", "image/png"},
 		{"photo.jpg", []byte("\xff\xd8\xff\xe0jpeg-content"), "image", ".jpg", "image/jpeg"},
 		{"audio.mp3", []byte("ID3\x04\x00\x00\x00\x00\x00\x00audio"), "audio", ".mp3", "audio/mpeg"},
+		{"audio-no-id3.mp3", []byte("\xff\xfb\x90\x64audio"), "audio", ".mp3", "audio/mpeg"},
 		{"audio.ogg", []byte("OggS\x00\x02audio"), "audio", ".ogg", "application/ogg"},
 		{"audio.wav", []byte("RIFF\x24\x00\x00\x00WAVEfmt "), "audio", ".wav", "audio/wave"},
 	}
@@ -126,6 +127,7 @@ func TestUploadFileValidation(t *testing.T) {
 		{"base из не-латиницы (!!!.pdf)", "!!!.pdf", pdf, ErrEmptyName},
 		{"html под видом png", "photo.png", []byte("<html>hi</html>"), ErrInvalidContentType},
 		{"octet-stream", "clue.pdf", []byte{0x00, 0x01, 0x02, 0x03}, ErrInvalidContentType},
+		{"ложный mp3 sync", "audio.mp3", []byte{0xff, 0xe0, 0x00, 0x00}, ErrInvalidContentType},
 		{"mismatch pdf+png", "clue.pdf", []byte("\x89PNG\r\n\x1a\ncontent"), ErrInvalidContentType},
 	}
 	for _, c := range cases {