diff --git a/HaishinKit.xcodeproj/project.pbxproj b/HaishinKit.xcodeproj/project.pbxproj
index 3e2888181..efd0b8e93 100644
--- a/HaishinKit.xcodeproj/project.pbxproj
+++ b/HaishinKit.xcodeproj/project.pbxproj
@@ -29,7 +29,6 @@
 		291619661E7EFB09009FB344 /* Main.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 291619621E7EFA2A009FB344 /* Main.storyboard */; };
 		291619691E7EFEA8009FB344 /* CameraIngestViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 291619671E7EFE4E009FB344 /* CameraIngestViewController.swift */; };
 		2916196A1E7EFF38009FB344 /* Preference.swift in Sources */ = {isa = PBXBuildFile; fileRef = 291468161E581C7D00E619BA /* Preference.swift */; };
-		2916196C1E7F0768009FB344 /* CMFormatDescription+Extension.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2916196B1E7F0768009FB344 /* CMFormatDescription+Extension.swift */; };
 		2917CB662104CA2800F6823A /* AudioSpecificConfigTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2917CB652104CA2800F6823A /* AudioSpecificConfigTests.swift */; };
 		291F4E381CF206E600F59C51 /* Icon.png in Resources */ = {isa = PBXBuildFile; fileRef = 291F4E361CF206E200F59C51 /* Icon.png */; };
 		2923A1F31D63004E0019FBCD /* VisualEffect.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2965436A1D62FEB700734698 /* VisualEffect.swift */; };
@@ -465,7 +464,6 @@
 		2915EC531D85BDF100621092 /* ReplayKit.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = ReplayKit.framework; path = System/Library/Frameworks/ReplayKit.framework; sourceTree = SDKROOT; };
 		291619631E7EFA2A009FB344 /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/Main.storyboard; sourceTree = "<group>"; };
 		291619671E7EFE4E009FB344 /* CameraIngestViewController.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = CameraIngestViewController.swift; sourceTree = "<group>"; };
-		2916196B1E7F0768009FB344 /* CMFormatDescription+Extension.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "CMFormatDescription+Extension.swift"; sourceTree = "<group>"; };
 		2917CB652104CA2800F6823A /* AudioSpecificConfigTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AudioSpecificConfigTests.swift; sourceTree = "<group>"; };
 		291F4E361CF206E200F59C51 /* Icon.png */ = {isa = PBXFileReference; lastKnownFileType = image.png; path = Icon.png; sourceTree = "<group>"; };
 		29205CBD1E461F4E009D3FFF /* Main.storyboard */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = file.storyboard; path = Main.storyboard; sourceTree = "<group>"; };
@@ -1173,7 +1171,6 @@
 				BC2828AE2AA322E400741013 /* AVFrameRateRange+Extension.swift */,
 				29EA87E51E79A2780043A5F8 /* CMAudioFormatDescription+Extension.swift */,
 				29EA87E91E79A3B70043A5F8 /* CMBlockBuffer+Extension.swift */,
-				2916196B1E7F0768009FB344 /* CMFormatDescription+Extension.swift */,
 				29EA87DE1E79A0810043A5F8 /* CMSampleBuffer+Extension.swift */,
 				BC04A2D52AD2D95500C87A3E /* CMTime+Extension.swift */,
 				29EA87E11E79A1E90043A5F8 /* CMVideoFormatDescription+Extension.swift */,
@@ -1886,7 +1883,6 @@
 				BC7C56B7299E579F00C41A9B /* AudioCodecSettings.swift in Sources */,
 				29B876AC1CD70B2800FC07DA /* AMF3Serializer.swift in Sources */,
 				BC31DBD22A653D1600C4DEA3 /* IOAudioMonitor.swift in Sources */,
-				2916196C1E7F0768009FB344 /* CMFormatDescription+Extension.swift in Sources */,
 				BCB976DF26107B5600C9A649 /* TSField.swift in Sources */,
 				BC11024A2925147300D48035 /* IOCaptureUnit.swift in Sources */,
 				29B876921CD70AFE00FC07DA /* IOMixer.swift in Sources */,
diff --git a/README.md b/README.md
index c7a1acd8c..6adb3f495 100644
--- a/README.md
+++ b/README.md
@@ -136,8 +136,8 @@ open HaishinKit.xcodeproj
 ### OS
 |-|iOS|tvOS|macOS|visionOS|watchOS|
 |:----|:----:|:----:|:----:|:----:|:----:|
-|HaishinKit|12.0+|12.0+|10.13+|1.0+|-|
-|SRTHaishinKit|12.0+|-|13.0+|-|-|
+|HaishinKit|13.0+|13.0+|10.15+|1.0+|-|
+|SRTHaishinKit|13.0+|-|13.0+|-|-|
 
 ### Cocoa Keys
 Please contains Info.plist.
diff --git a/Sources/Codec/VideoCodec.swift b/Sources/Codec/VideoCodec.swift
index c183aec6a..1e43a1da2 100644
--- a/Sources/Codec/VideoCodec.swift
+++ b/Sources/Codec/VideoCodec.swift
@@ -160,7 +160,7 @@ final class VideoCodec<T: VideoCodecDelegate> {
             var attributes: [NSString: AnyObject] = [:]
             if let inputFormat {
                 // Specify the pixel format of the uncompressed video.
-                attributes[kCVPixelBufferPixelFormatTypeKey] = inputFormat._mediaSubType as CFNumber
+                attributes[kCVPixelBufferPixelFormatTypeKey] = inputFormat.mediaType.rawValue as CFNumber
             }
             return attributes.isEmpty ? nil : attributes
         case .decompression:
diff --git a/Sources/Extension/AVCaptureDevice.Format+Extension.swift b/Sources/Extension/AVCaptureDevice.Format+Extension.swift
index 72528f3f2..0ca556de5 100644
--- a/Sources/Extension/AVCaptureDevice.Format+Extension.swift
+++ b/Sources/Extension/AVCaptureDevice.Format+Extension.swift
@@ -1,14 +1,7 @@
 import AVFoundation
 import Foundation
 
-#if os(iOS)
-extension AVCaptureDevice.Format {
-    @available(iOS, obsoleted: 13.0)
-    var isMultiCamSupported: Bool {
-        return false
-    }
-}
-#elseif os(macOS)
+#if os(macOS)
 extension AVCaptureDevice.Format {
     var isMultiCamSupported: Bool {
         return true
diff --git a/Sources/Extension/CMFormatDescription+Extension.swift b/Sources/Extension/CMFormatDescription+Extension.swift
deleted file mode 100644
index fd8f5d35a..000000000
--- a/Sources/Extension/CMFormatDescription+Extension.swift
+++ /dev/null
@@ -1,12 +0,0 @@
-import CoreMedia
-import Foundation
-
-extension CMFormatDescription {
-    var _mediaType: CMMediaType {
-        CMFormatDescriptionGetMediaType(self)
-    }
-
-    var _mediaSubType: FourCharCode {
-        CMFormatDescriptionGetMediaSubType(self)
-    }
-}
diff --git a/Sources/IO/IOStream.swift b/Sources/IO/IOStream.swift
index 2afe1356c..db255d200 100644
--- a/Sources/IO/IOStream.swift
+++ b/Sources/IO/IOStream.swift
@@ -364,12 +364,12 @@ open class IOStream: NSObject {
     /// Append a CMSampleBuffer.
     /// - Warning: This method can't use attachCamera or attachAudio method at the same time.
     public func append(_ sampleBuffer: CMSampleBuffer, channel: UInt8 = 0) {
-        switch sampleBuffer.formatDescription?._mediaType {
-        case kCMMediaType_Audio:
+        switch sampleBuffer.formatDescription?.mediaType {
+        case .audio?:
             mixer.audioIO.lockQueue.async {
                 self.mixer.audioIO.append(sampleBuffer, channel: channel)
             }
-        case kCMMediaType_Video:
+        case .video?:
             mixer.videoIO.lockQueue.async {
                 self.mixer.videoIO.append(sampleBuffer, channel: channel)
             }
diff --git a/Sources/IO/IOStreamRecorder.swift b/Sources/IO/IOStreamRecorder.swift
index 34268e035..a0f66d049 100644
--- a/Sources/IO/IOStreamRecorder.swift
+++ b/Sources/IO/IOStreamRecorder.swift
@@ -76,7 +76,7 @@ public final class IOStreamRecorder {
         guard isRunning.value else {
             return
         }
-        let mediaType: AVMediaType = (sampleBuffer.formatDescription?._mediaType == kCMMediaType_Video) ? .video : .audio
+        let mediaType: AVMediaType = (sampleBuffer.formatDescription?.mediaType == .video) ? .video : .audio
         lockQueue.async {
             guard
                 let writer = self.writer,