diff --git a/Package.swift b/Package.swift
index e377c5b1..93d9c899 100644
--- a/Package.swift
+++ b/Package.swift
@@ -17,7 +17,7 @@ let swiftSettings: [SwiftSetting] = [
 
 let package = Package(
     name: "hummingbird",
-    platforms: [.macOS(.v14), .iOS(.v17), .macCatalyst(.v17), .tvOS(.v17), .visionOS(.v1)],
+    platforms: [.macOS(.v11), .iOS(.v15), .macCatalyst(.v15), .tvOS(.v15), .visionOS(.v1)],
     products: [
         .library(name: "Hummingbird", targets: ["Hummingbird"]),
         .library(name: "HummingbirdCore", targets: ["HummingbirdCore"]),
diff --git a/Package@swift-6.0.swift b/Package@swift-6.0.swift
index 32ea7df3..3d6b3bdd 100644
--- a/Package@swift-6.0.swift
+++ b/Package@swift-6.0.swift
@@ -17,7 +17,7 @@ let swiftSettings: [SwiftSetting] = [
 
 let package = Package(
     name: "hummingbird",
-    platforms: [.macOS(.v14), .iOS(.v17), .macCatalyst(.v17), .tvOS(.v17), .visionOS(.v1)],
+    platforms: [.macOS(.v11), .iOS(.v15), .macCatalyst(.v15), .tvOS(.v15), .visionOS(.v1)],
     products: [
         .library(name: "Hummingbird", targets: ["Hummingbird"]),
         .library(name: "HummingbirdCore", targets: ["HummingbirdCore"]),
diff --git a/Package@swift-6.1.swift b/Package@swift-6.1.swift
index 58645c6f..083df979 100644
--- a/Package@swift-6.1.swift
+++ b/Package@swift-6.1.swift
@@ -17,7 +17,7 @@ let swiftSettings: [SwiftSetting] = [
 
 let package = Package(
     name: "hummingbird",
-    platforms: [.macOS(.v14), .iOS(.v17), .macCatalyst(.v17), .tvOS(.v17), .visionOS(.v1)],
+    platforms: [.macOS(.v11), .iOS(.v15), .macCatalyst(.v15), .tvOS(.v15), .visionOS(.v1)],
     products: [
         .library(name: "Hummingbird", targets: ["Hummingbird"]),
         .library(name: "HummingbirdCore", targets: ["HummingbirdCore"]),
diff --git a/Sources/Hummingbird/Application.swift b/Sources/Hummingbird/Application.swift
index da43e737..be8382e6 100644
--- a/Sources/Hummingbird/Application.swift
+++ b/Sources/Hummingbird/Application.swift
@@ -41,6 +41,7 @@ public enum EventLoopGroupProvider {
 }
 
 /// Protocol for an Application. Brings all the components of Hummingbird together
+@available(macOS 14, iOS 17, tvOS 17, *)
 public protocol ApplicationProtocol: Service where Context: InitializableFromSource<ApplicationRequestContextSource> {
     /// Responder that generates a response from a requests and context
     associatedtype Responder: HTTPResponder
@@ -67,11 +68,13 @@ public protocol ApplicationProtocol: Service where Context: InitializableFromSou
     var processesRunBeforeServerStart: [@Sendable () async throws -> Void] { get }
 }
 
+@available(macOS 14, iOS 17, tvOS 17, *)
 extension ApplicationProtocol {
     /// Server channel setup
     public var server: HTTPServerBuilder { .http1() }
 }
 
+@available(macOS 14, iOS 17, tvOS 17, *)
 extension ApplicationProtocol {
     /// Default event loop group used by application
     public var eventLoopGroup: any EventLoopGroup { MultiThreadedEventLoopGroup.singleton }
@@ -88,6 +91,7 @@ extension ApplicationProtocol {
 }
 
 /// Conform to `Service` from `ServiceLifecycle`.
+@available(macOS 14, iOS 17, tvOS 17, *)
 extension ApplicationProtocol {
     /// Construct application and run it
     public func run() async throws {
@@ -175,6 +179,7 @@ extension ApplicationProtocol {
 /// try await app.runService()
 /// ```
 /// Editing the application setup after calling `runService` will produce undefined behaviour.
+@available(macOS 14, iOS 17, tvOS 17, *)
 public struct Application<Responder: HTTPResponder>: ApplicationProtocol
 where Responder.Context: InitializableFromSource<ApplicationRequestContextSource> {
     // MARK: Member variables
@@ -303,6 +308,7 @@ where Responder.Context: InitializableFromSource<ApplicationRequestContextSource
     }
 }
 
+@available(macOS 14, iOS 17, tvOS 17, *)
 extension Application: CustomStringConvertible {
     public var description: String { "Application" }
 }
diff --git a/Sources/Hummingbird/Codable/URLEncodedForm/URLEncodedForm+Request.swift b/Sources/Hummingbird/Codable/URLEncodedForm/URLEncodedForm+Request.swift
index 3b11b9c8..b74eb0c4 100644
--- a/Sources/Hummingbird/Codable/URLEncodedForm/URLEncodedForm+Request.swift
+++ b/Sources/Hummingbird/Codable/URLEncodedForm/URLEncodedForm+Request.swift
@@ -6,6 +6,7 @@
 // SPDX-License-Identifier: Apache-2.0
 //
 
+@available(macOS 14, iOS 17, tvOS 17, *)
 extension URLEncodedFormEncoder: ResponseEncoder {
     /// Extend URLEncodedFormEncoder to support generating a ``HummingbirdCore/Response``. Sets body and header values
     /// - Parameters:
@@ -26,6 +27,7 @@ extension URLEncodedFormEncoder: ResponseEncoder {
     }
 }
 
+@available(macOS 14, iOS 17, tvOS 17, *)
 extension URLEncodedFormDecoder: RequestDecoder {
     /// Extend URLEncodedFormDecoder to decode from ``HummingbirdCore/Request``.
     /// - Parameters:
diff --git a/Sources/Hummingbird/Codable/URLEncodedForm/URLEncodedFormDecoder.swift b/Sources/Hummingbird/Codable/URLEncodedForm/URLEncodedFormDecoder.swift
index be7efa2a..1593b50e 100644
--- a/Sources/Hummingbird/Codable/URLEncodedForm/URLEncodedFormDecoder.swift
+++ b/Sources/Hummingbird/Codable/URLEncodedForm/URLEncodedFormDecoder.swift
@@ -9,6 +9,7 @@
 public import Foundation
 
 /// The wrapper struct for decoding URL encoded form data to Codable classes
+@available(macOS 14, iOS 17, tvOS 17, *)
 public struct URLEncodedFormDecoder: Sendable {
     /// The strategy to use for decoding `Date` values.
     public enum DateDecodingStrategy: Sendable {
@@ -75,6 +76,7 @@ public struct URLEncodedFormDecoder: Sendable {
     }
 }
 
+@available(macOS 14, iOS 17, tvOS 17, *)
 private class _URLEncodedFormDecoder: Decoder {
     // MARK: Properties
 
@@ -421,6 +423,7 @@ private class _URLEncodedFormDecoder: Decoder {
     }
 }
 
+@available(macOS 14, iOS 17, tvOS 17, *)
 extension _URLEncodedFormDecoder: SingleValueDecodingContainer {
     func decodeNil() -> Bool {
         (try? self.unboxNil(self.storage.topContainer)) ?? false
@@ -487,6 +490,7 @@ extension _URLEncodedFormDecoder: SingleValueDecodingContainer {
     }
 }
 
+@available(macOS 14, iOS 17, tvOS 17, *)
 extension _URLEncodedFormDecoder {
     func unboxNil(_ node: URLEncodedFormNode) throws -> Bool {
         switch node {
@@ -686,6 +690,7 @@ extension _URLEncodedFormDecoder {
     }
 }
 
+@available(macOS 14, iOS 17, tvOS 17, *)
 private struct URLEncodedFormDecodingStorage {
     /// the container stack
     private var containers: [URLEncodedFormNode] = []
diff --git a/Sources/Hummingbird/Codable/URLEncodedForm/URLEncodedFormEncoder.swift b/Sources/Hummingbird/Codable/URLEncodedForm/URLEncodedFormEncoder.swift
index 2c042a55..cceeff3b 100644
--- a/Sources/Hummingbird/Codable/URLEncodedForm/URLEncodedFormEncoder.swift
+++ b/Sources/Hummingbird/Codable/URLEncodedForm/URLEncodedFormEncoder.swift
@@ -9,6 +9,7 @@
 public import Foundation
 
 /// The wrapper struct for encoding Codable classes to URL encoded form data
+@available(macOS 14, iOS 17, tvOS 17, *)
 public struct URLEncodedFormEncoder: Sendable {
     /// The strategy to use for encoding `Date` values.
     public enum DateEncodingStrategy: Sendable {
@@ -80,6 +81,7 @@ public struct URLEncodedFormEncoder: Sendable {
 }
 
 /// Internal QueryEncoder class. Does all the heavy lifting
+@available(macOS 14, iOS 17, tvOS 17, *)
 private class _URLEncodedFormEncoder: Encoder {
     var codingPath: [any CodingKey]
 
@@ -273,6 +275,7 @@ private class _URLEncodedFormEncoder: Encoder {
     }
 }
 
+@available(macOS 14, iOS 17, tvOS 17, *)
 extension _URLEncodedFormEncoder: SingleValueEncodingContainer {
     func encodeResult(_ value: URLEncodedFormNode) {
         self.storage.push(container: value)
@@ -310,6 +313,7 @@ extension _URLEncodedFormEncoder: SingleValueEncodingContainer {
     }
 }
 
+@available(macOS 14, iOS 17, tvOS 17, *)
 extension _URLEncodedFormEncoder {
     func box(_ date: Date) throws -> URLEncodedFormNode {
         switch self.options.dateEncodingStrategy {
@@ -355,6 +359,7 @@ extension _URLEncodedFormEncoder {
 }
 
 /// storage for Query Encoder. Stores a stack of QueryEncoder containers, plus leaf objects
+@available(macOS 14, iOS 17, tvOS 17, *)
 private struct URLEncodedFormEncoderStorage {
     /// the container stack
     private var containers: [URLEncodedFormNode] = []
diff --git a/Sources/Hummingbird/Codable/URLEncodedForm/URLEncodedFormNode.swift b/Sources/Hummingbird/Codable/URLEncodedForm/URLEncodedFormNode.swift
index e15a7f33..56319bac 100644
--- a/Sources/Hummingbird/Codable/URLEncodedForm/URLEncodedFormNode.swift
+++ b/Sources/Hummingbird/Codable/URLEncodedForm/URLEncodedFormNode.swift
@@ -71,6 +71,7 @@ extension URLEncodedFormError {
     }
 }
 /// Internal representation of URL encoded form data used by both encode and decode
+@available(macOS 14, iOS 17, tvOS 17, *)
 enum URLEncodedFormNode: CustomStringConvertible, Equatable {
     /// holds a value
     case leaf(NodeValue?)
diff --git a/Sources/Hummingbird/HTTP/Cookie.swift b/Sources/Hummingbird/HTTP/Cookie.swift
index e762f1ca..d0093503 100644
--- a/Sources/Hummingbird/HTTP/Cookie.swift
+++ b/Sources/Hummingbird/HTTP/Cookie.swift
@@ -13,6 +13,7 @@ public import Foundation
 #endif
 
 /// Structure holding a single cookie
+@available(macOS 14, iOS 17, tvOS 17, *)
 public struct Cookie: Sendable, CustomStringConvertible {
     public struct ValidationError: Error {
         enum Reason {
diff --git a/Sources/Hummingbird/HTTP/Cookies.swift b/Sources/Hummingbird/HTTP/Cookies.swift
index 3e06399e..f7d73ad7 100644
--- a/Sources/Hummingbird/HTTP/Cookies.swift
+++ b/Sources/Hummingbird/HTTP/Cookies.swift
@@ -9,6 +9,7 @@
 /// Structure holding an array of cookies
 ///
 /// Cookies can be accessed from request via `Request.cookies`.
+@available(macOS 14, iOS 17, tvOS 17, *)
 public struct Cookies: Sendable {
     /// Construct cookies accessor from `Request`
     /// - Parameter request: request to get cookies from
diff --git a/Sources/Hummingbird/HTTP/Request+Cookies.swift b/Sources/Hummingbird/HTTP/Request+Cookies.swift
index 5b08dd4c..5eb82449 100644
--- a/Sources/Hummingbird/HTTP/Request+Cookies.swift
+++ b/Sources/Hummingbird/HTTP/Request+Cookies.swift
@@ -8,6 +8,7 @@
 
 public import HummingbirdCore
 
+@available(macOS 14, iOS 17, tvOS 17, *)
 extension Request {
     /// access cookies from request. When accessing this for the first time the Cookies struct will be created
     public var cookies: Cookies {
diff --git a/Sources/Hummingbird/HTTP/Response+Cookies.swift b/Sources/Hummingbird/HTTP/Response+Cookies.swift
index 6c5d1ceb..f087576c 100644
--- a/Sources/Hummingbird/HTTP/Response+Cookies.swift
+++ b/Sources/Hummingbird/HTTP/Response+Cookies.swift
@@ -8,6 +8,7 @@
 
 public import HummingbirdCore
 
+@available(macOS 14, iOS 17, tvOS 17, *)
 extension Response {
     /// Set cookie on response
     public mutating func setCookie(_ cookie: Cookie) {
@@ -15,6 +16,7 @@ extension Response {
     }
 }
 
+@available(macOS 14, iOS 17, tvOS 17, *)
 extension EditedResponse {
     /// Set cookie on reponse patch
     ///
diff --git a/Sources/Hummingbird/Middleware/FileMiddleware.swift b/Sources/Hummingbird/Middleware/FileMiddleware.swift
index 593a25fa..815fefdd 100644
--- a/Sources/Hummingbird/Middleware/FileMiddleware.swift
+++ b/Sources/Hummingbird/Middleware/FileMiddleware.swift
@@ -40,6 +40,7 @@ public protocol FileMiddlewareFileAttributes {
 /// "if-modified-since", "if-none-match", "if-range" and 'range" headers. It will output "content-length",
 /// "modified-date", "eTag", "content-type", "cache-control" and "content-range" headers where
 /// they are relevant.
+@available(macOS 14, iOS 17, tvOS 17, *)
 public struct FileMiddleware<Context: RequestContext, Provider: FileProvider>: RouterMiddleware
 where Provider.FileAttributes: FileMiddlewareFileAttributes {
     let cacheControl: CacheControl
@@ -221,6 +222,7 @@ where Provider.FileAttributes: FileMiddlewareFileAttributes {
     }
 }
 
+@available(macOS 14, iOS 17, tvOS 17, *)
 extension FileMiddleware {
     /// Whether to return data from the file or a not modified response
     private enum FileResult {
diff --git a/Sources/Hummingbird/Middleware/MiddlewareGroup.swift b/Sources/Hummingbird/Middleware/MiddlewareGroup.swift
index b74517d5..fbd6d8a2 100644
--- a/Sources/Hummingbird/Middleware/MiddlewareGroup.swift
+++ b/Sources/Hummingbird/Middleware/MiddlewareGroup.swift
@@ -7,6 +7,7 @@
 //
 
 /// Group of middleware that can be used to create a responder chain. Each middleware calls the next one
+@available(macOS 14, iOS 17, tvOS 17, *)
 public final class MiddlewareGroup<Context> {
     var middlewares: [any MiddlewareProtocol<Request, Response, Context>]
 
diff --git a/Sources/Hummingbird/Middleware/TracingMiddleware.swift b/Sources/Hummingbird/Middleware/TracingMiddleware.swift
index e02b5ef0..ea85e76f 100644
--- a/Sources/Hummingbird/Middleware/TracingMiddleware.swift
+++ b/Sources/Hummingbird/Middleware/TracingMiddleware.swift
@@ -28,6 +28,7 @@ import Foundation
 /// Swift-Distributed-Tracing has a flexible backend, which will need to be initialized before any traces are recorded.
 ///
 /// A list of implementations is available in the swift-distributed-tracing repository's README.
+@available(macOS 14, iOS 17, tvOS 17, *)
 public struct TracingMiddleware<Context: RequestContext>: RouterMiddleware {
     private let headerNamesToRecord: Set<RecordingHeader>
     private let queryParametersToRedact: Set<Substring>
@@ -196,6 +197,7 @@ public protocol RemoteAddressRequestContext: RequestContext {
     var remoteAddress: SocketAddress? { get }
 }
 
+@available(macOS 14, iOS 17, tvOS 17, *)
 struct RecordingHeader: Hashable {
     let name: HTTPField.Name
     let attributeName: String
diff --git a/Sources/Hummingbird/Router/EndpointResponder.swift b/Sources/Hummingbird/Router/EndpointResponder.swift
index 1fbc74e8..8cdacdc3 100644
--- a/Sources/Hummingbird/Router/EndpointResponder.swift
+++ b/Sources/Hummingbird/Router/EndpointResponder.swift
@@ -9,6 +9,7 @@
 public import HTTPTypes
 
 /// Stores endpoint responders for each HTTP method
+@available(macOS 14, iOS 17, tvOS 17, *)
 @usableFromInline
 struct EndpointResponders<Context>: Sendable {
     init(path: RouterPath) {
diff --git a/Sources/Hummingbird/Router/RouteCollection.swift b/Sources/Hummingbird/Router/RouteCollection.swift
index beb34d5a..46fb98e7 100644
--- a/Sources/Hummingbird/Router/RouteCollection.swift
+++ b/Sources/Hummingbird/Router/RouteCollection.swift
@@ -9,6 +9,7 @@
 public import HTTPTypes
 
 /// Collection of routes
+@available(macOS 14, iOS 17, tvOS 17, *)
 public final class RouteCollection<Context: RequestContext>: RouterMethods {
     /// Initialize RouteCollection
     public init(context: Context.Type = BasicRequestContext.self) {
@@ -52,6 +53,7 @@ public final class RouteCollection<Context: RequestContext>: RouterMethods {
     let middlewares: MiddlewareGroup<Context>
 }
 
+@available(macOS 14, iOS 17, tvOS 17, *)
 extension RouterMethods {
     /// Add route collection to router
     /// - Parameters
diff --git a/Sources/Hummingbird/Router/Router+validation.swift b/Sources/Hummingbird/Router/Router+validation.swift
index b4d30b3d..5ed85202 100644
--- a/Sources/Hummingbird/Router/Router+validation.swift
+++ b/Sources/Hummingbird/Router/Router+validation.swift
@@ -14,6 +14,7 @@ import FoundationEssentials
 import Foundation
 #endif
 
+@available(macOS 14, iOS 17, tvOS 17, *)
 extension Router {
     /// Route description
     public struct RouteDescription: CustomStringConvertible {
diff --git a/Sources/Hummingbird/Router/Router.swift b/Sources/Hummingbird/Router/Router.swift
index a384fb63..0c13b412 100644
--- a/Sources/Hummingbird/Router/Router.swift
+++ b/Sources/Hummingbird/Router/Router.swift
@@ -36,6 +36,7 @@ public import HummingbirdCore
 /// Both of these match routes which start with "/user" and the next path segment being anything.
 /// The second version extracts the path segment out and adds it to `Request.parameters` with the
 /// key "id".
+@available(macOS 14, iOS 17, tvOS 17, *)
 public final class Router<Context: RequestContext>: RouterMethods, HTTPResponderBuilder {
     var trie: RouterPathTrieBuilder<EndpointResponders<Context>>
     public let middlewares: MiddlewareGroup<Context>
diff --git a/Sources/Hummingbird/Router/RouterGroup.swift b/Sources/Hummingbird/Router/RouterGroup.swift
index 2ae7e9f8..a7c045ad 100644
--- a/Sources/Hummingbird/Router/RouterGroup.swift
+++ b/Sources/Hummingbird/Router/RouterGroup.swift
@@ -23,6 +23,7 @@ public import HummingbirdCore
 /// .put(":id", use: todoController.update)
 /// .delete(":id", use: todoController.delete)
 /// ```
+@available(macOS 14, iOS 17, tvOS 17, *)
 public struct RouterGroup<Context: RequestContext>: RouterMethods {
     let path: RouterPath
     let parent: any RouterMethods<Context>
diff --git a/Sources/Hummingbird/Router/RouterMethods.swift b/Sources/Hummingbird/Router/RouterMethods.swift
index 2737f08e..147adb0e 100644
--- a/Sources/Hummingbird/Router/RouterMethods.swift
+++ b/Sources/Hummingbird/Router/RouterMethods.swift
@@ -34,6 +34,7 @@ public protocol RouterMethods<Context>: _HB_SendableMetatype {
     func add(middleware: any MiddlewareProtocol<Request, Response, Context>) -> Self
 }
 
+@available(macOS 14, iOS 17, tvOS 17, *)
 extension RouterMethods {
     /// Add path for async closure
     @discardableResult public func on(
diff --git a/Sources/Hummingbird/Router/RouterResponder.swift b/Sources/Hummingbird/Router/RouterResponder.swift
index c635fff7..eb3a26c9 100644
--- a/Sources/Hummingbird/Router/RouterResponder.swift
+++ b/Sources/Hummingbird/Router/RouterResponder.swift
@@ -8,6 +8,7 @@
 
 import NIOCore
 
+@available(macOS 14, iOS 17, tvOS 17, *)
 public struct RouterResponder<Context: RequestContext>: HTTPResponder {
     @usableFromInline
     let trie: RouterTrie<EndpointResponders<Context>>
diff --git a/Sources/Hummingbird/Server/Request.swift b/Sources/Hummingbird/Server/Request.swift
index 405eef3d..c0efceb8 100644
--- a/Sources/Hummingbird/Server/Request.swift
+++ b/Sources/Hummingbird/Server/Request.swift
@@ -58,6 +58,7 @@ extension Request {
     }
 }
 
+@available(macOS 14, iOS 17, tvOS 17, *)
 extension Request {
     /// Conditional request which will only be processed if the eTag supplied is not in the
     /// `If-None-Match` request header.
diff --git a/Sources/Hummingbird/Server/URI+decodeQuery.swift b/Sources/Hummingbird/Server/URI+decodeQuery.swift
index 8e530a61..da934177 100644
--- a/Sources/Hummingbird/Server/URI+decodeQuery.swift
+++ b/Sources/Hummingbird/Server/URI+decodeQuery.swift
@@ -9,6 +9,7 @@
 public import HummingbirdCore
 import Logging
 
+@available(macOS 14, iOS 17, tvOS 17, *)
 extension URI {
     /// Decode request query using ``Hummingbird/URLEncodedFormDecoder``.
     /// - Parameters
diff --git a/Sources/Hummingbird/Storage/MemoryPersistDriver.swift b/Sources/Hummingbird/Storage/MemoryPersistDriver.swift
index 9401c8e1..759d889c 100644
--- a/Sources/Hummingbird/Storage/MemoryPersistDriver.swift
+++ b/Sources/Hummingbird/Storage/MemoryPersistDriver.swift
@@ -12,6 +12,7 @@ import NIOCore
 import ServiceLifecycle
 
 /// In memory driver for persist system for storing persistent cross request key/value pairs
+@available(macOS 14, iOS 17, tvOS 17, *)
 public actor MemoryPersistDriver<C: Clock>: PersistDriver where C.Duration == Duration {
     public struct Configuration: Sendable {
         /// amount of time between each call to tidy
diff --git a/Sources/Hummingbird/Storage/PersistDriver.swift b/Sources/Hummingbird/Storage/PersistDriver.swift
index 58a3c12f..641c0188 100644
--- a/Sources/Hummingbird/Storage/PersistDriver.swift
+++ b/Sources/Hummingbird/Storage/PersistDriver.swift
@@ -9,6 +9,7 @@
 public import ServiceLifecycle
 
 /// Protocol for driver supporting persistent Key/Value pairs across requests
+@available(macOS 14, iOS 17, tvOS 17, *)
 public protocol PersistDriver: Service {
     /// shutdown driver
     func shutdown() async throws
@@ -40,6 +41,7 @@ public protocol PersistDriver: Service {
     func remove(key: String) async throws
 }
 
+@available(macOS 14, iOS 17, tvOS 17, *)
 extension PersistDriver {
     /// default implemenation of shutdown()
     public func shutdown() async throws {}
diff --git a/Sources/Hummingbird/Utils/DateCache.swift b/Sources/Hummingbird/Utils/DateCache.swift
index d1404f9f..d6a161ea 100644
--- a/Sources/Hummingbird/Utils/DateCache.swift
+++ b/Sources/Hummingbird/Utils/DateCache.swift
@@ -22,6 +22,7 @@ import Foundation
 ///
 /// Getting the current date formatted is an expensive operation. This creates a task that will
 /// update a cached version of the date in the format as detailed in RFC9110 once every second.
+@available(macOS 14, iOS 17, tvOS 17, *)
 final class DateCache: Service {
     final class DateContainer: AtomicReference, Sendable {
         let date: String
diff --git a/Sources/Hummingbird/Utils/HTTPHeaderDateFormatStyle.swift b/Sources/Hummingbird/Utils/HTTPHeaderDateFormatStyle.swift
index 30fd566b..2a759c77 100644
--- a/Sources/Hummingbird/Utils/HTTPHeaderDateFormatStyle.swift
+++ b/Sources/Hummingbird/Utils/HTTPHeaderDateFormatStyle.swift
@@ -18,6 +18,7 @@ import FoundationEssentials
 import Foundation
 #endif
 
+@available(macOS 14, iOS 17, tvOS 17, *)
 extension Date {
     init?(httpHeader: String) {
         try? self.init(httpHeader, strategy: .rfc9110)
@@ -30,6 +31,7 @@ extension Date {
 
 struct HTTPHeaderDateParsingError: Error {}
 
+@available(macOS 14, iOS 17, tvOS 17, *)
 struct HTTPHeaderDateFormatStyle {
     let calendar: Calendar
 
@@ -40,6 +42,7 @@ struct HTTPHeaderDateFormatStyle {
     }
 }
 
+@available(macOS 14, iOS 17, tvOS 17, *)
 extension HTTPHeaderDateFormatStyle: ParseStrategy {
     func parse(_ input: String) throws -> Date {
         guard let components = self.components(from: input) else {
@@ -275,6 +278,7 @@ let timezoneOffsetMap: [[UInt8]: Int] = [
     Array("PDT".utf8): -7 * 60,
 ]
 
+@available(macOS 14, iOS 17, tvOS 17, *)
 extension HTTPHeaderDateFormatStyle: FormatStyle {
     //let calendar: Calendar
 
@@ -319,10 +323,12 @@ extension HTTPHeaderDateFormatStyle: FormatStyle {
     ]
 }
 
+@available(macOS 14, iOS 17, tvOS 17, *)
 extension FormatStyle where Self == HTTPHeaderDateFormatStyle {
     static var rfc9110: Self { .init() }
 }
 
+@available(macOS 14, iOS 17, tvOS 17, *)
 extension ParseStrategy where Self == HTTPHeaderDateFormatStyle {
     static var rfc9110: Self { .init() }
 }
diff --git a/Sources/HummingbirdCore/Server/HTTP/HTTPServerBuilder.swift b/Sources/HummingbirdCore/Server/HTTP/HTTPServerBuilder.swift
index c98884d9..4339e323 100644
--- a/Sources/HummingbirdCore/Server/HTTP/HTTPServerBuilder.swift
+++ b/Sources/HummingbirdCore/Server/HTTP/HTTPServerBuilder.swift
@@ -32,6 +32,7 @@ public struct HTTPServerBuilder: Sendable {
     ///   - responder: HTTP responder
     ///   - onServerRunning: Closure to run once server is up and running
     /// - Returns: Server Service
+    @available(macOS 14, iOS 17, tvOS 17, *)
     public func buildServer(
         configuration: ServerConfiguration,
         eventLoopGroup: any EventLoopGroup,
diff --git a/Sources/HummingbirdCore/Server/Server.swift b/Sources/HummingbirdCore/Server/Server.swift
index ced1fad5..5f4b350c 100644
--- a/Sources/HummingbirdCore/Server/Server.swift
+++ b/Sources/HummingbirdCore/Server/Server.swift
@@ -18,6 +18,7 @@ import NIOTransportServices
 #endif
 
 /// HTTP server class
+@available(macOS 14, iOS 17, tvOS 17, *)
 public actor Server<ChildChannel: ServerChildChannel>: Service {
     public typealias AsyncChildChannel = ChildChannel.Value
     public typealias AsyncServerChannel = NIOAsyncChannel<AsyncChildChannel, Never>
@@ -88,6 +89,7 @@ public actor Server<ChildChannel: ServerChildChannel>: Service {
         self.logger = logger
     }
 
+    @available(macOS 14, iOS 17, tvOS 17, *)
     public func run() async throws {
         switch self.state {
         case .initial(let childChannelSetup, let configuration, let onServerRunning):
@@ -361,6 +363,7 @@ extension NIOTSListenerBootstrap: ServerBootstrapProtocol {
 }
 #endif
 
+@available(macOS 14, iOS 17, tvOS 17, *)
 extension Server: CustomStringConvertible {
     public nonisolated var description: String {
         "Hummingbird"
diff --git a/Sources/HummingbirdCore/Server/ServerChildChannel.swift b/Sources/HummingbirdCore/Server/ServerChildChannel.swift
index e556eded..9b9ffaab 100644
--- a/Sources/HummingbirdCore/Server/ServerChildChannel.swift
+++ b/Sources/HummingbirdCore/Server/ServerChildChannel.swift
@@ -34,6 +34,7 @@ public protocol ServerChildChannel: Sendable {
     func handle(value: Value, logger: Logger) async
 }
 
+@available(macOS 14, iOS 17, tvOS 17, *)
 extension ServerChildChannel {
     /// Build existential ``Server`` from existential `ServerChildChannel`
     ///
diff --git a/Sources/HummingbirdHTTP2/HTTP2Channel.swift b/Sources/HummingbirdHTTP2/HTTP2Channel.swift
index 711c5ca7..27234559 100644
--- a/Sources/HummingbirdHTTP2/HTTP2Channel.swift
+++ b/Sources/HummingbirdHTTP2/HTTP2Channel.swift
@@ -15,6 +15,7 @@ import NIOHTTPTypesHTTP2
 import NIOSSL
 
 /// HTTP2 configuration
+@available(macOS 14, iOS 17, tvOS 17, *)
 public struct HTTP2ChannelConfiguration: Sendable {
     /// Idle timeout, how long connection is kept idle before closing
     public var idleTimeout: Duration?
@@ -44,6 +45,7 @@ public struct HTTP2ChannelConfiguration: Sendable {
 }
 
 /// Child channel for processing HTTP2
+@available(macOS 14, iOS 17, tvOS 17, *)
 public struct HTTP2Channel: ServerChildChannel {
     public typealias Configuration = HTTP2ChannelConfiguration
     typealias HTTP2Connection = NIOHTTP2Handler.AsyncStreamMultiplexer<HTTP2StreamChannel.Value>
diff --git a/Sources/HummingbirdHTTP2/HTTP2ServerConnectionManager+StateMachine.swift b/Sources/HummingbirdHTTP2/HTTP2ServerConnectionManager+StateMachine.swift
index def8b863..be6350df 100644
--- a/Sources/HummingbirdHTTP2/HTTP2ServerConnectionManager+StateMachine.swift
+++ b/Sources/HummingbirdHTTP2/HTTP2ServerConnectionManager+StateMachine.swift
@@ -9,6 +9,7 @@
 import NIOCore
 import NIOHTTP2
 
+@available(macOS 14, iOS 17, tvOS 17, *)
 extension HTTP2ServerConnectionManager {
     struct StateMachine: ~Copyable {
         var state: State
@@ -196,6 +197,7 @@ extension HTTP2ServerConnectionManager {
     }
 }
 
+@available(macOS 14, iOS 17, tvOS 17, *)
 extension HTTP2ServerConnectionManager.StateMachine {
     enum State: ~Copyable {
         struct ActiveState {
@@ -232,6 +234,7 @@ extension HTTP2ServerConnectionManager.StateMachine {
     }
 }
 
+@available(macOS 14, iOS 17, tvOS 17, *)
 extension HTTP2ServerConnectionManager.StateMachine {
     struct Keepalive {
         /// Allow the client to send keep alive pings when there are no active calls.
@@ -303,6 +306,7 @@ extension HTTP2ServerConnectionManager.StateMachine {
     }
 }
 
+@available(macOS 14, iOS 17, tvOS 17, *)
 extension HTTP2ServerConnectionManager.StateMachine {
     //     case active(ActiveState)
     //     case closing(ClosingState)
diff --git a/Sources/HummingbirdHTTP2/HTTP2ServerConnectionManager.swift b/Sources/HummingbirdHTTP2/HTTP2ServerConnectionManager.swift
index d867d2f8..807e790a 100644
--- a/Sources/HummingbirdHTTP2/HTTP2ServerConnectionManager.swift
+++ b/Sources/HummingbirdHTTP2/HTTP2ServerConnectionManager.swift
@@ -12,6 +12,7 @@ import NIOHTTP2
 /// HTTP2 server connection manager
 ///
 /// This is heavily based off the ServerConnectionManagementHandler from https://github.com/grpc/grpc-swift-nio-transport
+@available(macOS 14, iOS 17, tvOS 17, *)
 final class HTTP2ServerConnectionManager: ChannelDuplexHandler {
     package typealias InboundIn = HTTP2Frame
     package typealias InboundOut = HTTP2Frame
@@ -225,6 +226,7 @@ final class HTTP2ServerConnectionManager: ChannelDuplexHandler {
     }
 }
 
+@available(macOS 14, iOS 17, tvOS 17, *)
 extension HTTP2ServerConnectionManager {
     struct LoopBoundHandler: @unchecked Sendable {
         let handler: HTTP2ServerConnectionManager
@@ -240,6 +242,7 @@ extension HTTP2ServerConnectionManager {
     }
 }
 
+@available(macOS 14, iOS 17, tvOS 17, *)
 extension HTTP2ServerConnectionManager {
     /// Stream delegate
     struct HTTP2StreamDelegate: NIOHTTP2StreamDelegate, @unchecked Sendable {
diff --git a/Sources/HummingbirdHTTP2/HTTP2UpgradeChannel.swift b/Sources/HummingbirdHTTP2/HTTP2UpgradeChannel.swift
index 49d05681..c2151e28 100644
--- a/Sources/HummingbirdHTTP2/HTTP2UpgradeChannel.swift
+++ b/Sources/HummingbirdHTTP2/HTTP2UpgradeChannel.swift
@@ -17,6 +17,7 @@ import NIOSSL
 import NIOTLS
 
 /// Child channel for processing HTTP1 with the option of upgrading to HTTP2 via ALPN
+@available(macOS 14, iOS 17, tvOS 17, *)
 public struct HTTP2UpgradeChannel: HTTPChannelHandler {
     public typealias Configuration = HTTP2ChannelConfiguration
     typealias HTTP1Connection = HTTP1Channel.Value
diff --git a/Sources/HummingbirdHTTP2/HTTPServerBuilder+http2.swift b/Sources/HummingbirdHTTP2/HTTPServerBuilder+http2.swift
index 2bc1d0f2..c42c3030 100644
--- a/Sources/HummingbirdHTTP2/HTTPServerBuilder+http2.swift
+++ b/Sources/HummingbirdHTTP2/HTTPServerBuilder+http2.swift
@@ -10,6 +10,7 @@ import HummingbirdCore
 import NIOCore
 import NIOSSL
 
+@available(macOS 14, iOS 17, tvOS 17, *)
 extension HTTPServerBuilder {
     /// Build HTTP channel with HTTP2 upgrade
     ///
diff --git a/Sources/HummingbirdTesting/Application+Test.swift b/Sources/HummingbirdTesting/Application+Test.swift
index e9fb7462..b6f9f9c8 100644
--- a/Sources/HummingbirdTesting/Application+Test.swift
+++ b/Sources/HummingbirdTesting/Application+Test.swift
@@ -36,6 +36,7 @@ public struct TestingSetup {
 }
 
 /// Extends `ApplicationProtocol` to support testing of applications
+@available(macOS 14, iOS 17, tvOS 17, *)
 extension ApplicationProtocol {
     // MARK: Initialization
 
diff --git a/Sources/HummingbirdTesting/AsyncHTTPClientTestFramework.swift b/Sources/HummingbirdTesting/AsyncHTTPClientTestFramework.swift
index 3388a653..02667f27 100644
--- a/Sources/HummingbirdTesting/AsyncHTTPClientTestFramework.swift
+++ b/Sources/HummingbirdTesting/AsyncHTTPClientTestFramework.swift
@@ -19,6 +19,7 @@ import ServiceLifecycle
 import UnixSignals
 
 /// Test using a live server and AsyncHTTPClient as a client
+@available(macOS 14, iOS 17, tvOS 17, *)
 final class AsyncHTTPClientTestFramework<App: ApplicationProtocol>: ApplicationTestFramework {
     struct Client: TestClientProtocol {
         let client: HTTPClient
diff --git a/Sources/HummingbirdTesting/LiveTestFramework.swift b/Sources/HummingbirdTesting/LiveTestFramework.swift
index dacf3d64..d9c657d4 100644
--- a/Sources/HummingbirdTesting/LiveTestFramework.swift
+++ b/Sources/HummingbirdTesting/LiveTestFramework.swift
@@ -16,6 +16,7 @@ import ServiceLifecycle
 import UnixSignals
 
 /// Test using a live server
+@available(macOS 14, iOS 17, tvOS 17, *)
 final class LiveTestFramework<App: ApplicationProtocol>: ApplicationTestFramework {
     struct Client: TestClientProtocol {
         let client: TestClient
diff --git a/Sources/HummingbirdTesting/RouterTestFramework.swift b/Sources/HummingbirdTesting/RouterTestFramework.swift
index a028fea5..feb709b6 100644
--- a/Sources/HummingbirdTesting/RouterTestFramework.swift
+++ b/Sources/HummingbirdTesting/RouterTestFramework.swift
@@ -20,6 +20,7 @@ import ServiceLifecycle
 import UnixSignals
 
 /// Test sending requests directly to router. This does not setup a live server
+@available(macOS 14, iOS 17, tvOS 17, *)
 struct RouterTestFramework<Responder: HTTPResponder>: ApplicationTestFramework where Responder.Context: InitializableFromSource {
     let responder: Responder
     let makeContext: @Sendable (Logger) -> Responder.Context
diff --git a/Sources/HummingbirdTesting/TestApplication.swift b/Sources/HummingbirdTesting/TestApplication.swift
index 0d812210..b2f47bbe 100644
--- a/Sources/HummingbirdTesting/TestApplication.swift
+++ b/Sources/HummingbirdTesting/TestApplication.swift
@@ -16,6 +16,7 @@ import ServiceLifecycle
 /// TestApplication used to wrap Application being tested.
 ///
 /// This is needed to override the `onServerRunning` function
+@available(macOS 14, iOS 17, tvOS 17, *)
 internal struct TestApplication<BaseApp: ApplicationProtocol>: ApplicationProtocol, Service {
     typealias Responder = BaseApp.Responder
 
diff --git a/Sources/HummingbirdTesting/TestClient+types.swift b/Sources/HummingbirdTesting/TestClient+types.swift
index 1d015cfa..904c9308 100644
--- a/Sources/HummingbirdTesting/TestClient+types.swift
+++ b/Sources/HummingbirdTesting/TestClient+types.swift
@@ -10,6 +10,7 @@ public import HTTPTypes
 public import NIOCore
 
 /// HTTP client types
+@available(macOS 14, iOS 17, tvOS 17, *)
 extension TestClient {
     public enum Error: Swift.Error {
         case invalidURL
diff --git a/Sources/HummingbirdTesting/TestClient.swift b/Sources/HummingbirdTesting/TestClient.swift
index 9e896b64..cb079555 100644
--- a/Sources/HummingbirdTesting/TestClient.swift
+++ b/Sources/HummingbirdTesting/TestClient.swift
@@ -18,6 +18,7 @@ public import NIOSSL
 ///
 /// This HTTP client is used for internal testing of Hummingbird and is also
 /// the client used by `.live` testing framework.
+@available(macOS 14, iOS 17, tvOS 17, *)
 public struct TestClient: Sendable {
     public let channelPromise: EventLoopPromise<any Channel>
     let eventLoopGroup: any EventLoopGroup
diff --git a/Sources/PerformanceTest/main.swift b/Sources/PerformanceTest/main.swift
index 35cb80a2..6dac7c57 100644
--- a/Sources/PerformanceTest/main.swift
+++ b/Sources/PerformanceTest/main.swift
@@ -11,58 +11,62 @@ import Logging
 import NIOCore
 import NIOPosix
 
-// get environment
-let env = Environment()
-let hostname = env.get("SERVER_HOSTNAME") ?? "127.0.0.1"
-let port = env.get("SERVER_PORT", as: Int.self) ?? 8080
+if #available(macOS 14, iOS 17, tvOS 17, *) {
+    // get environment
+    let env = Environment()
+    let hostname = env.get("SERVER_HOSTNAME") ?? "127.0.0.1"
+    let port = env.get("SERVER_PORT", as: Int.self) ?? 8080
 
-// create app
-let elg = MultiThreadedEventLoopGroup(numberOfThreads: 4)
-var router = Router()
-router.addMiddleware {
-    FileMiddleware()
-}
+    // create app
+    let elg = MultiThreadedEventLoopGroup(numberOfThreads: 4)
+    var router = Router()
+    router.addMiddleware {
+        FileMiddleware()
+    }
 
-// number of raw requests
-// ./wrk -c 128 -d 15s -t 8 http://localhost:8080
-router.get { _, _ in
-    "Hello, world"
-}
+    // number of raw requests
+    // ./wrk -c 128 -d 15s -t 8 http://localhost:8080
+    router.get { _, _ in
+        "Hello, world"
+    }
 
-// request with a body
-// ./wrk -c 128 -d 15s -t 8 -s scripts/post.lua http://localhost:8080
-router.post { request, _ in
-    Response(status: .ok, body: .init(asyncSequence: request.body))
-}
+    // request with a body
+    // ./wrk -c 128 -d 15s -t 8 -s scripts/post.lua http://localhost:8080
+    router.post { request, _ in
+        Response(status: .ok, body: .init(asyncSequence: request.body))
+    }
 
-struct Object: ResponseEncodable {
-    let message: String
-}
+    struct Object: ResponseEncodable {
+        let message: String
+    }
 
-// return JSON
-// ./wrk -c 128 -d 15s -t 8 http://localhost:8080/json
-router.get("json") { _, _ in
-    Object(message: "Hello, world")
-}
+    // return JSON
+    // ./wrk -c 128 -d 15s -t 8 http://localhost:8080/json
+    router.get("json") { _, _ in
+        Object(message: "Hello, world")
+    }
 
-// return JSON
-// ./wrk -c 128 -d 15s -t 8 http://localhost:8080/json
-router.get("wait") { _, _ in
-    try await Task.sleep(for: .seconds(8))
-    return "I waited"
-}
+    // return JSON
+    // ./wrk -c 128 -d 15s -t 8 http://localhost:8080/json
+    router.get("wait") { _, _ in
+        try await Task.sleep(for: .seconds(8))
+        return "I waited"
+    }
 
-var app = Application(
-    responder: router.buildResponder(),
-    configuration: .init(
-        address: .hostname(hostname, port: port),
-        serverName: "Hummingbird"
-    ),
-    eventLoopGroupProvider: .shared(elg)
-)
-app.logger.logLevel = .debug
+    var app = Application(
+        responder: router.buildResponder(),
+        configuration: .init(
+            address: .hostname(hostname, port: port),
+            serverName: "Hummingbird"
+        ),
+        eventLoopGroupProvider: .shared(elg)
+    )
+    app.logger.logLevel = .debug
 
-// configure app
+    // configure app
 
-// run app
-try await app.runService()
+    // run app
+    try await app.runService()
+} else {
+    fatalError("Hummingbird requires macOS 14, iOS 17 or tvOS 17")
+}