diff --git a/Source/SocketIO/Client/SocketIOClientSpec.swift b/Source/SocketIO/Client/SocketIOClientSpec.swift
index 5015e44..3835412 100644
--- a/Source/SocketIO/Client/SocketIOClientSpec.swift
+++ b/Source/SocketIO/Client/SocketIOClientSpec.swift
@@ -26,7 +26,7 @@ import Dispatch
 import Foundation
 
 /// Defines the interface for a SocketIOClient.
-public protocol SocketIOClientSpec : class {
+public protocol SocketIOClientSpec : AnyObject {
     // MARK: Properties
 
     /// A handler that will be called on any event.
diff --git a/Source/SocketIO/Manager/SocketManagerSpec.swift b/Source/SocketIO/Manager/SocketManagerSpec.swift
index 79f0e98..4440193 100644
--- a/Source/SocketIO/Manager/SocketManagerSpec.swift
+++ b/Source/SocketIO/Manager/SocketManagerSpec.swift
@@ -46,7 +46,7 @@ import Foundation
 /// or call one of the `disconnectSocket` methods on this class.
 ///
 @objc
-public protocol SocketManagerSpec : class, SocketEngineClient {
+public protocol SocketManagerSpec : AnyObject, SocketEngineClient {
     // MARK: Properties
 
     /// Returns the socket associated with the default namespace ("/").
diff --git a/Source/SocketIO/Parse/SocketParsable.swift b/Source/SocketIO/Parse/SocketParsable.swift
index 35a04b9..aa5e399 100644
--- a/Source/SocketIO/Parse/SocketParsable.swift
+++ b/Source/SocketIO/Parse/SocketParsable.swift
@@ -23,7 +23,7 @@
 import Foundation
 
 /// Defines that a type will be able to parse socket.io-protocol messages.
-public protocol SocketParsable : class {
+public protocol SocketParsable : AnyObject {
     // MARK: Methods
 
     /// Called when the engine has received some binary data that should be attached to a packet.
@@ -57,7 +57,7 @@ public enum SocketParsableError : Error {
 }
 
 /// Says that a type will be able to buffer binary data before all data for an event has come in.
-public protocol SocketDataBufferable : class {
+public protocol SocketDataBufferable : AnyObject {
     // MARK: Properties
 
     /// A list of packets that are waiting for binary data.
diff --git a/Source/SocketIO/Util/SocketLogger.swift b/Source/SocketIO/Util/SocketLogger.swift
index 46e3f1b..69293fb 100644
--- a/Source/SocketIO/Util/SocketLogger.swift
+++ b/Source/SocketIO/Util/SocketLogger.swift
@@ -25,7 +25,7 @@
 import Foundation
 
 /// Represents a class will log client events.
-public protocol SocketLogger : class {
+public protocol SocketLogger : AnyObject {
     // MARK: Properties
 
     /// Whether to log or not