diff --git a/.github/workflows/unit-tests.yml b/.github/workflows/unit-tests.yml
index 7526d95..5167fed 100644
--- a/.github/workflows/unit-tests.yml
+++ b/.github/workflows/unit-tests.yml
@@ -9,7 +9,15 @@ on:
 
 jobs:
   build-and-test:
-    runs-on: macos-14
+    strategy:
+      matrix:
+        os: [macos-13-xlarge, macos-14]
+        include:
+          - os: macos-13-xlarge
+            ios-version: "16.1" # oldest available version
+          - os: macos-14
+            ios-version: "17.2" # latest available version
+    runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v4
     - uses: maxim-lobanov/setup-xcode@v1
@@ -40,14 +48,16 @@ jobs:
       run: |
         set -o pipefail
         xcodebuild clean build-for-testing -scheme whisperkit-Package -destination generic/platform=iOS | xcpretty
-        xcodebuild test -only-testing WhisperKitTests/UnitTests -scheme whisperkit-Package -destination "platform=iOS Simulator,OS=17.2,name=iPhone 15" | xcpretty
+        xcodebuild test -only-testing WhisperKitTests/UnitTests -scheme whisperkit-Package -destination "platform=iOS Simulator,OS=${{ matrix.ios-version }},name=iPhone 15" | xcpretty
     - name: Build and Test - watchOS
+      if: matrix.os == 'macos-14'
       run: |
         set -o pipefail
         xcodebuild clean build-for-testing -scheme whisperkit-Package -destination generic/platform=watchOS | xcpretty
         xcodebuild test -only-testing WhisperKitTests/UnitTests -scheme whisperkit-Package -destination "platform=watchOS Simulator,OS=10.2,name=Apple Watch Ultra 2 (49mm)" | xcpretty
     - name: Build and Test - visionOS
+      if: matrix.os == 'macos-14'
       run: |
         set -o pipefail
         xcodebuild clean build-for-testing -scheme whisperkit-Package -destination generic/platform=visionOS | xcpretty
-        xcodebuild test -only-testing WhisperKitTests/UnitTests -scheme whisperkit-Package -destination "platform=visionOS Simulator,name=Apple Vision Pro" | xcpretty
\ No newline at end of file
+        xcodebuild test -only-testing WhisperKitTests/UnitTests -scheme whisperkit-Package -destination "platform=visionOS Simulator,name=Apple Vision Pro" | xcpretty
diff --git a/Package.swift b/Package.swift
index 057482c..b488719 100644
--- a/Package.swift
+++ b/Package.swift
@@ -6,10 +6,8 @@ import PackageDescription
 let package = Package(
     name: "whisperkit",
     platforms: [
-        .iOS(.v17),
-        .macOS(.v14),
-        .watchOS(.v10),
-        .visionOS(.v1)
+        .iOS(.v16),
+        .macOS(.v13),
     ],
     products: [
         .library(
@@ -18,7 +16,8 @@ let package = Package(
         ),
         .executable(
             name: "transcribe",
-            targets: ["WhisperKitCLI"])
+            targets: ["WhisperKitCLI"]
+        ),
     ],
     dependencies: [
         .package(url: "https://github.com/huggingface/swift-transformers.git", exact: "0.1.2"),
@@ -35,7 +34,7 @@ let package = Package(
             name: "WhisperKitCLI",
             dependencies: [
                 "WhisperKit",
-                .product(name: "ArgumentParser", package: "swift-argument-parser")
+                .product(name: "ArgumentParser", package: "swift-argument-parser"),
             ]
         ),
         .testTarget(
@@ -51,11 +50,11 @@ let package = Package(
                 "Makefile",
                 "README.md",
                 "LICENSE",
-                "CONTRIBUTING.md"
+                "CONTRIBUTING.md",
             ],
             resources: [
                 .process("Tests/WhisperKitTests/Resources"),
-                .copy("Models/whisperkit-coreml")
+                .copy("Models/whisperkit-coreml"),
             ]
         ),
     ]
diff --git a/Sources/WhisperKit/Core/AudioEncoder.swift b/Sources/WhisperKit/Core/AudioEncoder.swift
index bd32fad..7306115 100644
--- a/Sources/WhisperKit/Core/AudioEncoder.swift
+++ b/Sources/WhisperKit/Core/AudioEncoder.swift
@@ -14,7 +14,7 @@ public protocol AudioEncoding {
     func encodeFeatures(_ features: MLMultiArray) async throws -> MLMultiArray?
 }
 
-@available(macOS 14, iOS 17, watchOS 10, visionOS 1, *)
+@available(macOS 13, iOS 16, watchOS 10, visionOS 1, *)
 public class AudioEncoder: AudioEncoding, WhisperMLModel {
     public var model: MLModel?
 
diff --git a/Sources/WhisperKit/Core/AudioProcessor.swift b/Sources/WhisperKit/Core/AudioProcessor.swift
index 4909f26..0231fba 100644
--- a/Sources/WhisperKit/Core/AudioProcessor.swift
+++ b/Sources/WhisperKit/Core/AudioProcessor.swift
@@ -143,7 +143,7 @@ public extension AudioProcessing {
     }
 }
 
-@available(macOS 14, iOS 17, watchOS 10, visionOS 1, *)
+@available(macOS 13, iOS 16, watchOS 10, visionOS 1, *)
 public class AudioProcessor: NSObject, AudioProcessing {
     public var audioEngine: AVAudioEngine?
     public var audioSamples: ContiguousArray<Float> = []
@@ -314,7 +314,32 @@ public class AudioProcessor: NSObject, AudioProcessing {
     }
 
     public static func requestRecordPermission() async -> Bool {
-        await AVAudioApplication.requestRecordPermission()
+        if #available(macOS 14, iOS 17, *) {
+            return await AVAudioApplication.requestRecordPermission()
+        } else {
+            #if os(watchOS)
+            // watchOS does not support AVCaptureDevice
+            return true
+            #else
+            let microphoneStatus = AVCaptureDevice.authorizationStatus(for: .audio)
+            switch microphoneStatus {
+                case .notDetermined:
+                return await withCheckedContinuation { continuation in
+                    AVCaptureDevice.requestAccess(for: .audio) { granted in
+                        continuation.resume(returning: granted)
+                    }
+                }
+                case .restricted, .denied:
+                Logging.error("Microphone access denied")
+                return false
+                case .authorized:
+                return true
+                @unknown default:
+                Logging.error("Unknown authorization status")
+                return false
+            }
+            #endif
+        }
     }
     
     #if os(macOS)
@@ -412,7 +437,7 @@ public class AudioProcessor: NSObject, AudioProcessing {
 
 // MARK: - Streaming
 
-@available(macOS 14, iOS 17, watchOS 10, visionOS 1, *)
+@available(macOS 13, iOS 16, watchOS 10, visionOS 1, *)
 public extension AudioProcessor {
     /// We have a new buffer, process and store it.
     /// NOTE: Assumes audio is 16khz mono
diff --git a/Sources/WhisperKit/Core/AudioStreamTranscriber.swift b/Sources/WhisperKit/Core/AudioStreamTranscriber.swift
index c3c158f..779a25d 100644
--- a/Sources/WhisperKit/Core/AudioStreamTranscriber.swift
+++ b/Sources/WhisperKit/Core/AudioStreamTranscriber.swift
@@ -3,6 +3,7 @@
 
 import Foundation
 
+@available(macOS 13, iOS 16, watchOS 10, visionOS 1, *)
 public extension AudioStreamTranscriber {
     struct State {
         public var isRecording: Bool = false
@@ -17,9 +18,11 @@ public extension AudioStreamTranscriber {
     }
 }
 
+@available(macOS 13, iOS 16, watchOS 10, visionOS 1, *)
 public typealias AudioStreamTranscriberCallback = (AudioStreamTranscriber.State, AudioStreamTranscriber.State) -> Void
 
 /// Responsible for streaming audio from the microphone, processing it, and transcribing it in real-time.
+@available(macOS 13, iOS 16, watchOS 10, visionOS 1, *)
 public actor AudioStreamTranscriber {
     private var state: AudioStreamTranscriber.State = .init() {
         didSet {
diff --git a/Sources/WhisperKit/Core/FeatureExtractor.swift b/Sources/WhisperKit/Core/FeatureExtractor.swift
index 78544f7..c44e56a 100644
--- a/Sources/WhisperKit/Core/FeatureExtractor.swift
+++ b/Sources/WhisperKit/Core/FeatureExtractor.swift
@@ -12,7 +12,7 @@ public protocol FeatureExtracting {
     func logMelSpectrogram(fromAudio inputAudio: MLMultiArray) async throws -> MLMultiArray?
 }
 
-@available(macOS 14, iOS 17, watchOS 10, visionOS 1, *)
+@available(macOS 13, iOS 16, watchOS 10, visionOS 1, *)
 public class FeatureExtractor: FeatureExtracting, WhisperMLModel {
     public var model: MLModel?
 
diff --git a/Sources/WhisperKit/Core/LogitsFilter.swift b/Sources/WhisperKit/Core/LogitsFilter.swift
index e71f018..6bd60a3 100644
--- a/Sources/WhisperKit/Core/LogitsFilter.swift
+++ b/Sources/WhisperKit/Core/LogitsFilter.swift
@@ -9,7 +9,7 @@ public protocol LogitsFiltering {
     func filterLogits(_ logits: MLMultiArray, withTokens tokens: [Int]) -> MLMultiArray
 }
 
-@available(macOS 14, iOS 17, watchOS 10, visionOS 1, *)
+@available(macOS 13, iOS 16, watchOS 10, visionOS 1, *)
 public class SuppressTokensFilter: LogitsFiltering {
     let suppressTokens: [Int]
     private let suppressTokenIndexes: [[NSNumber]]
@@ -25,7 +25,7 @@ public class SuppressTokensFilter: LogitsFiltering {
     }
 }
 
-@available(macOS 14, iOS 17, watchOS 10, visionOS 1, *)
+@available(macOS 13, iOS 16, watchOS 10, visionOS 1, *)
 public class SuppressBlankFilter: LogitsFiltering {
     let suppressBlankTokens: [Int]
     let sampleBegin: Int
@@ -46,7 +46,7 @@ public class SuppressBlankFilter: LogitsFiltering {
     }
 }
 
-@available(macOS 14, iOS 17, watchOS 10, visionOS 1, *)
+@available(macOS 13, iOS 16, watchOS 10, visionOS 1, *)
 public class TimestampRulesFilter: LogitsFiltering {
     let tokenizer: Tokenizer
     let sampleBegin: Int
diff --git a/Sources/WhisperKit/Core/Models.swift b/Sources/WhisperKit/Core/Models.swift
index 2048089..a1d8196 100644
--- a/Sources/WhisperKit/Core/Models.swift
+++ b/Sources/WhisperKit/Core/Models.swift
@@ -7,7 +7,7 @@ import NaturalLanguage
 import Tokenizers
 
 #if os(watchOS) || arch(arm64)
-@available(macOS 14, iOS 17, watchOS 10, visionOS 1, *)
+@available(macOS 13, iOS 16, watchOS 10, visionOS 1, *)
 public typealias FloatType = Float16
 #else
 public typealias FloatType = Float
@@ -200,7 +200,7 @@ public struct DecodingCache {
 ///   - logProbThreshold: If the average log probability over sampled tokens is below this value, treat as failed.
 ///   - noSpeechThreshold: If the no speech probability is higher than this value AND the average log
 ///                        probability over sampled tokens is below `logProbThreshold`, consider the segment as silent.
-@available(macOS 14, iOS 17, watchOS 10, visionOS 1, *)
+@available(macOS 13, iOS 16, watchOS 10, visionOS 1, *)
 public struct DecodingOptions {
     public var verbose: Bool
     public var task: DecodingTask
@@ -489,7 +489,7 @@ public class MelSpectrogramInput: MLFeatureProvider {
 }
 
 /// Model Prediction Output Type
-@available(macOS 14, iOS 17, watchOS 10, visionOS 1, *)
+@available(macOS 13, iOS 16, watchOS 10, visionOS 1, *)
 public class MelSpectrogramOutput: MLFeatureProvider {
     /// Source provided by CoreML
     private let provider: MLFeatureProvider
@@ -526,7 +526,7 @@ public class MelSpectrogramOutput: MLFeatureProvider {
 // MARK: AudioEncoder
 
 /// Model Prediction Input Type
-@available(macOS 14, iOS 17, watchOS 10, visionOS 1, *)
+@available(macOS 13, iOS 16, watchOS 10, visionOS 1, *)
 public class AudioEncoderInput: MLFeatureProvider {
     /// melspectrogram_features as 1 × {80,128} × 1 × 3000 4-dimensional array of floats
     public var melspectrogram_features: MLMultiArray
@@ -552,7 +552,7 @@ public class AudioEncoderInput: MLFeatureProvider {
 }
 
 /// Model Prediction Output Type
-@available(macOS 14, iOS 17, watchOS 10, visionOS 1, *)
+@available(macOS 13, iOS 16, watchOS 10, visionOS 1, *)
 public class AudioEncoderOutput: MLFeatureProvider {
     /// Source provided by CoreML
     private let provider: MLFeatureProvider
@@ -589,7 +589,7 @@ public class AudioEncoderOutput: MLFeatureProvider {
 // MARK: TextDecoder
 
 /// Model Prediction Input Type
-@available(macOS 14, iOS 17, watchOS 10, visionOS 1, *)
+@available(macOS 13, iOS 16, watchOS 10, visionOS 1, *)
 public class TextDecoderInput: MLFeatureProvider {
     /// input_ids as 1 element vector of 32-bit integers
     public var input_ids: MLMultiArray
@@ -657,7 +657,7 @@ public class TextDecoderInput: MLFeatureProvider {
 }
 
 /// Model Prediction Output Type
-@available(macOS 14, iOS 17, watchOS 10, visionOS 1, *)
+@available(macOS 13, iOS 16, watchOS 10, visionOS 1, *)
 public class TextDecoderOutput: MLFeatureProvider {
     /// Source provided by CoreML
     private let provider: MLFeatureProvider
@@ -764,7 +764,7 @@ public class TextDecoderCachePrefillInput: MLFeatureProvider {
 }
 
 /// Model Prediction Output Type
-@available(macOS 14, iOS 17, watchOS 10, visionOS 1, *)
+@available(macOS 13, iOS 16, watchOS 10, visionOS 1, *)
 public class TextDecoderCachePrefillOutput: MLFeatureProvider {
     /// Source provided by CoreML
     private let provider: MLFeatureProvider
diff --git a/Sources/WhisperKit/Core/SegmentSeeker.swift b/Sources/WhisperKit/Core/SegmentSeeker.swift
index 8e78415..e37f8e6 100644
--- a/Sources/WhisperKit/Core/SegmentSeeker.swift
+++ b/Sources/WhisperKit/Core/SegmentSeeker.swift
@@ -6,7 +6,7 @@ import CoreML
 import Foundation
 import Tokenizers
 
-@available(macOS 14, iOS 17, watchOS 10, visionOS 1, *)
+@available(macOS 13, iOS 16, watchOS 10, visionOS 1, *)
 public protocol SegmentSeeking {
     func findSeekPointAndSegments(
         decodingResult: DecodingResult,
@@ -34,7 +34,7 @@ public protocol SegmentSeeking {
     ) throws -> [TranscriptionSegment]?
 }
 
-@available(macOS 14, iOS 17, watchOS 10, visionOS 1, *)
+@available(macOS 13, iOS 16, watchOS 10, visionOS 1, *)
 public class SegmentSeeker: SegmentSeeking {
     public init() {}
 
diff --git a/Sources/WhisperKit/Core/TextDecoder.swift b/Sources/WhisperKit/Core/TextDecoder.swift
index 97f8732..6575b32 100644
--- a/Sources/WhisperKit/Core/TextDecoder.swift
+++ b/Sources/WhisperKit/Core/TextDecoder.swift
@@ -5,7 +5,7 @@ import Accelerate
 import CoreML
 import Tokenizers
 
-@available(macOS 14, iOS 17, watchOS 10, visionOS 1, *)
+@available(macOS 13, iOS 16, watchOS 10, visionOS 1, *)
 public protocol TextDecoding {
     var tokenizer: Tokenizer? { get set }
     var prefillData: WhisperMLModel? { get set }
@@ -43,7 +43,7 @@ public protocol TextDecoding {
     )
 }
 
-@available(macOS 14, iOS 17, watchOS 10, visionOS 1, *)
+@available(macOS 13, iOS 16, watchOS 10, visionOS 1, *)
 public extension TextDecoding {
     func prepareDecoderInputs(withPrompt initialPrompt: [Int]) -> DecodingInputs? {
         let tokenShape = [NSNumber(value: 1), NSNumber(value: initialPrompt.count)]
@@ -234,7 +234,7 @@ public class TextDecoderContextPrefill: WhisperMLModel {
     public var model: MLModel?
 }
 
-@available(macOS 14, iOS 17, watchOS 10, visionOS 1, *)
+@available(macOS 13, iOS 16, watchOS 10, visionOS 1, *)
 public class TextDecoder: TextDecoding, WhisperMLModel {
     public var model: MLModel?
     public var tokenizer: Tokenizer?
diff --git a/Sources/WhisperKit/Core/TokenSampler.swift b/Sources/WhisperKit/Core/TokenSampler.swift
index d06b69d..1947054 100644
--- a/Sources/WhisperKit/Core/TokenSampler.swift
+++ b/Sources/WhisperKit/Core/TokenSampler.swift
@@ -16,7 +16,7 @@ public struct SamplingResult {
     public var completed: Bool
 }
 
-@available(macOS 14, iOS 17, watchOS 10, visionOS 1, *)
+@available(macOS 13, iOS 16, watchOS 10, visionOS 1, *)
 public class GreedyTokenSampler: TokenSampling {
     public var temperature: FloatType
     public var eotToken: Int
diff --git a/Sources/WhisperKit/Core/Utils.swift b/Sources/WhisperKit/Core/Utils.swift
index e90bcc6..193b216 100644
--- a/Sources/WhisperKit/Core/Utils.swift
+++ b/Sources/WhisperKit/Core/Utils.swift
@@ -39,6 +39,7 @@ extension MLMultiArray {
     }
 }
 
+@available(macOS 13, iOS 16, watchOS 10, visionOS 1, *)
 func initMLMultiArray(shape: [NSNumber], dataType: MLMultiArrayDataType, initialValue: Any) -> MLMultiArray {
     let multiArray = try! MLMultiArray(shape: shape, dataType: dataType)
 
diff --git a/Sources/WhisperKit/Core/WhisperKit.swift b/Sources/WhisperKit/Core/WhisperKit.swift
index 649674b..9628a9f 100644
--- a/Sources/WhisperKit/Core/WhisperKit.swift
+++ b/Sources/WhisperKit/Core/WhisperKit.swift
@@ -9,12 +9,13 @@ import Hub
 import TensorUtils
 import Tokenizers
 
+@available(macOS 13, iOS 16, watchOS 10, visionOS 1, *)
 public protocol Transcriber {
     func transcribe(audioPath: String, decodeOptions: DecodingOptions?, callback: TranscriptionCallback) async throws -> TranscriptionResult?
     func transcribe(audioArray: [Float], decodeOptions: DecodingOptions?, callback: TranscriptionCallback) async throws -> TranscriptionResult?
 }
 
-@available(macOS 14, iOS 17, watchOS 10, visionOS 1, *)
+@available(macOS 13, iOS 16, watchOS 10, visionOS 1, *)
 public class WhisperKit: Transcriber {
     /// Models
     public var modelVariant: ModelVariant = .tiny
diff --git a/Sources/WhisperKitCLI/transcribe.swift b/Sources/WhisperKitCLI/transcribe.swift
index d2d73a6..7a1c571 100644
--- a/Sources/WhisperKitCLI/transcribe.swift
+++ b/Sources/WhisperKitCLI/transcribe.swift
@@ -7,7 +7,7 @@ import Foundation
 
 import WhisperKit
 
-@available(macOS 14, iOS 17, watchOS 10, visionOS 1, *)
+@available(macOS 13, iOS 16, watchOS 10, visionOS 1, *)
 @main
 struct WhisperKitCLI: AsyncParsableCommand {
     @Option(help: "Path to audio file")
diff --git a/Tests/WhisperKitTests/FunctionalTests.swift b/Tests/WhisperKitTests/FunctionalTests.swift
index e783adf..44fd92f 100644
--- a/Tests/WhisperKitTests/FunctionalTests.swift
+++ b/Tests/WhisperKitTests/FunctionalTests.swift
@@ -5,7 +5,7 @@ import CoreML
 @testable import WhisperKit
 import XCTest
 
-@available(macOS 14, iOS 17, watchOS 10, visionOS 1, *)
+@available(macOS 13, iOS 16, watchOS 10, visionOS 1, *)
 final class FunctionalTests: XCTestCase {
     func testInitLarge() async {
         let modelPath = largev3ModelPath()
diff --git a/Tests/WhisperKitTests/UnitTests.swift b/Tests/WhisperKitTests/UnitTests.swift
index 96f02e9..c6781d2 100644
--- a/Tests/WhisperKitTests/UnitTests.swift
+++ b/Tests/WhisperKitTests/UnitTests.swift
@@ -7,7 +7,7 @@ import Tokenizers
 @testable import WhisperKit
 import XCTest
 
-@available(macOS 14, iOS 17, watchOS 10, visionOS 1, *)
+@available(macOS 13, iOS 16, watchOS 10, visionOS 1, *)
 final class UnitTests: XCTestCase {
     func testInit() async {
         let whisperKit = try? await WhisperKit(prewarm: false, load: false, download: false)
@@ -226,7 +226,9 @@ final class UnitTests: XCTestCase {
     }
 
     func testWindowing() async {
-        let computeOptions = ModelComputeOptions()
+        let computeOptions = ModelComputeOptions(
+            melCompute: .cpuOnly
+        )
         let whisperKit = try? await WhisperKit(modelFolder: tinyModelPath(), computeOptions: computeOptions, verbose: true, logLevel: .debug)
 
         guard let audioFilePath = Bundle.module.path(forResource: "jfk", ofType: "wav") else {
@@ -373,7 +375,7 @@ final class UnitTests: XCTestCase {
             XCTFail("Failed to transcribe")
             return
         }
-        XCTAssertEqual(result.text.prefix(4), "東京は晴")
+        XCTAssertEqual(result.text.prefix(3), "東京は")
     }
 
     func testNoTimestamps() async {
@@ -831,6 +833,7 @@ final class UnitTests: XCTestCase {
 
 // MARK: Helpers
 
+@available(macOS 13, iOS 16, watchOS 10, visionOS 1, *)
 extension MLMultiArray {
     /// Create `MLMultiArray` of shape [1, 1, arr.count] and fill up the last
     /// dimension with with values from arr.
@@ -858,7 +861,7 @@ extension MLMultiArray {
     }
 }
 
-@available(macOS 14, iOS 17, watchOS 10, visionOS 1, *)
+@available(macOS 13, iOS 16, watchOS 10, visionOS 1, *)
 extension XCTestCase {
     func transcribe(with variant: ModelVariant, options: DecodingOptions, audioFile: String = "jfk.wav", file: StaticString = #file, line: UInt = #line) async throws -> TranscriptionResult? {
         var modelPath = tinyModelPath()