diff --git a/internal/api/client/instance/instancepatch_test.go b/internal/api/client/instance/instancepatch_test.go
index 5c7923adc..504fd7eb9 100644
--- a/internal/api/client/instance/instancepatch_test.go
+++ b/internal/api/client/instance/instancepatch_test.go
@@ -120,7 +120,7 @@ func (suite *InstancePatchTestSuite) TestInstancePatch1() {
         "image/apng",
         "audio/ogg",
         "video/ogg",
-        "audio/x-m4a",
+        "audio/mp4",
         "video/mp4",
         "video/quicktime",
         "audio/x-ms-wma",
@@ -261,7 +261,7 @@ func (suite *InstancePatchTestSuite) TestInstancePatch2() {
         "image/apng",
         "audio/ogg",
         "video/ogg",
-        "audio/x-m4a",
+        "audio/mp4",
         "video/mp4",
         "video/quicktime",
         "audio/x-ms-wma",
@@ -402,7 +402,7 @@ func (suite *InstancePatchTestSuite) TestInstancePatch3() {
         "image/apng",
         "audio/ogg",
         "video/ogg",
-        "audio/x-m4a",
+        "audio/mp4",
         "video/mp4",
         "video/quicktime",
         "audio/x-ms-wma",
@@ -594,7 +594,7 @@ func (suite *InstancePatchTestSuite) TestInstancePatch6() {
         "image/apng",
         "audio/ogg",
         "video/ogg",
-        "audio/x-m4a",
+        "audio/mp4",
         "video/mp4",
         "video/quicktime",
         "audio/x-ms-wma",
@@ -757,7 +757,7 @@ func (suite *InstancePatchTestSuite) TestInstancePatch8() {
         "image/apng",
         "audio/ogg",
         "video/ogg",
-        "audio/x-m4a",
+        "audio/mp4",
         "video/mp4",
         "video/quicktime",
         "audio/x-ms-wma",
@@ -939,7 +939,7 @@ func (suite *InstancePatchTestSuite) TestInstancePatch9() {
         "image/apng",
         "audio/ogg",
         "video/ogg",
-        "audio/x-m4a",
+        "audio/mp4",
         "video/mp4",
         "video/quicktime",
         "audio/x-ms-wma",
diff --git a/internal/media/manager_test.go b/internal/media/manager_test.go
index c281b1000..e175369f5 100644
--- a/internal/media/manager_test.go
+++ b/internal/media/manager_test.go
@@ -664,7 +664,7 @@ func (suite *ManagerTestSuite) TestOpusProcess() {
 		Duration: util.Ptr(float32(122.10006)),
 		Bitrate:  util.Ptr(uint64(116426)),
 	}, attachment.FileMeta.Original)
-	suite.Equal("audio/ogg", attachment.File.ContentType)
+	suite.Equal("audio/opus", attachment.File.ContentType)
 	suite.Equal(1776956, attachment.File.FileSize)
 	suite.Empty(attachment.Blurhash)
 
diff --git a/internal/typeutils/internaltofrontend_test.go b/internal/typeutils/internaltofrontend_test.go
index a01060ebc..cf11655ca 100644
--- a/internal/typeutils/internaltofrontend_test.go
+++ b/internal/typeutils/internaltofrontend_test.go
@@ -1958,7 +1958,7 @@ func (suite *InternalToFrontendTestSuite) TestInstanceV1ToFrontend() {
         "image/apng",
         "audio/ogg",
         "video/ogg",
-        "audio/x-m4a",
+        "audio/mp4",
         "video/mp4",
         "video/quicktime",
         "audio/x-ms-wma",
@@ -2103,7 +2103,7 @@ func (suite *InternalToFrontendTestSuite) TestInstanceV2ToFrontend() {
         "image/apng",
         "audio/ogg",
         "video/ogg",
-        "audio/x-m4a",
+        "audio/mp4",
         "video/mp4",
         "video/quicktime",
         "audio/x-ms-wma",