diff --git a/.swift-version b/.swift-version
index 4d54dad..bec3a35 100644
--- a/.swift-version
+++ b/.swift-version
@@ -1 +1 @@
-4.0.2
+system
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 415de90..9c9bcee 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,10 @@
-# 13.1.1
+# v13.1.2
+
+- Fix [#950](https://github.com/socketio/socket.io-client-swift/issues/950)
+- Conforming to `SocketEngineWebsocket` no longer requires conforming to `WebsocketDelegate`
+
+
+# v13.1.1
 
 - Fix [#923](https://github.com/socketio/socket.io-client-swift/issues/923)
 - Fix [#894](https://github.com/socketio/socket.io-client-swift/issues/894)
diff --git a/Cartfile.resolved b/Cartfile.resolved
index 8dff7a8..62b4094 100644
--- a/Cartfile.resolved
+++ b/Cartfile.resolved
@@ -1,3 +1,3 @@
+github "daltoniam/Starscream" "3.0.3"
 github "daltoniam/common-crypto-spm" "1.1.0"
 github "daltoniam/zlib-spm" "1.1.0"
-github "daltoniam/Starscream" "3.0.2"
diff --git a/Source/SocketIO/Ack/SocketAckEmitter.swift b/Source/SocketIO/Ack/SocketAckEmitter.swift
index db8cecf..a7c80be 100644
--- a/Source/SocketIO/Ack/SocketAckEmitter.swift
+++ b/Source/SocketIO/Ack/SocketAckEmitter.swift
@@ -108,7 +108,7 @@ public final class OnAckCallback : NSObject {
 
     /// Completes an emitWithAck. If this isn't called, the emit never happens.
     ///
-    /// - parameter after: The number of seconds before this emit times out if an ack hasn't been received.
+    /// - parameter seconds: The number of seconds before this emit times out if an ack hasn't been received.
     /// - parameter callback: The callback called when an ack is received, or when a timeout happens.
     ///                       To check for timeout, use `SocketAckStatus`'s `noAck` case.
     @objc
@@ -121,9 +121,9 @@ public final class OnAckCallback : NSObject {
         guard seconds != 0 else { return }
 
         socket.manager?.handleQueue.asyncAfter(deadline: DispatchTime.now() + seconds) {[weak socket] in
-            guard let socket = socket, let manager = socket.manager else { return }
+            guard let socket = socket else { return }
 
-            socket.ackHandlers.timeoutAck(self.ackNumber, onQueue: manager.handleQueue)
+            socket.ackHandlers.timeoutAck(self.ackNumber)
         }
     }
 
diff --git a/Source/SocketIO/Ack/SocketAckManager.swift b/Source/SocketIO/Ack/SocketAckManager.swift
index cda3271..4679f37 100644
--- a/Source/SocketIO/Ack/SocketAckManager.swift
+++ b/Source/SocketIO/Ack/SocketAckManager.swift
@@ -58,31 +58,20 @@ private struct SocketAck : Hashable {
     }
 }
 
-struct SocketAckManager {
+class SocketAckManager {
     private var acks = Set<SocketAck>(minimumCapacity: 1)
-    private let ackSemaphore = DispatchSemaphore(value: 1)
 
-    mutating func addAck(_ ack: Int, callback: @escaping AckCallback) {
+    func addAck(_ ack: Int, callback: @escaping AckCallback) {
         acks.insert(SocketAck(ack: ack, callback: callback))
     }
 
     /// Should be called on handle queue
-    mutating func executeAck(_ ack: Int, with items: [Any], onQueue: DispatchQueue) {
-        ackSemaphore.wait()
-        defer { ackSemaphore.signal() }
-        let ack = acks.remove(SocketAck(ack: ack))
-
-        onQueue.async() { ack?.callback(items) }
+    func executeAck(_ ack: Int, with items: [Any]) {
+        acks.remove(SocketAck(ack: ack))?.callback(items)
     }
 
     /// Should be called on handle queue
-    mutating func timeoutAck(_ ack: Int, onQueue: DispatchQueue) {
-        ackSemaphore.wait()
-        defer { ackSemaphore.signal() }
-        let ack = acks.remove(SocketAck(ack: ack))
-
-        onQueue.async() {
-            ack?.callback?([SocketAckStatus.noAck.rawValue])
-        }
+    func timeoutAck(_ ack: Int) {
+       acks.remove(SocketAck(ack: ack))?.callback?([SocketAckStatus.noAck.rawValue])
     }
 }
diff --git a/Source/SocketIO/Client/SocketIOClient.swift b/Source/SocketIO/Client/SocketIOClient.swift
index 587319c..a8f12f4 100644
--- a/Source/SocketIO/Client/SocketIOClient.swift
+++ b/Source/SocketIO/Client/SocketIOClient.swift
@@ -75,7 +75,7 @@ open class SocketIOClient : NSObject, SocketIOClientSpec {
         }
     }
 
-    var ackHandlers = SocketAckManager()
+    let ackHandlers = SocketAckManager()
 
     private(set) var currentAck = -1
 
@@ -86,7 +86,7 @@ open class SocketIOClient : NSObject, SocketIOClientSpec {
     /// Type safe way to create a new SocketIOClient. `opts` can be omitted.
     ///
     /// - parameter manager: The manager for this socket.
-    /// - parameter socketURL: The url of the socket.io server.
+    /// - parameter nsp: The namespace of the socket.
     @objc
     public init(manager: SocketManagerSpec, nsp: String) {
         self.manager = manager
@@ -115,7 +115,7 @@ open class SocketIOClient : NSObject, SocketIOClientSpec {
     ///
     /// - parameter timeoutAfter: The number of seconds after which if we are not connected we assume the connection
     ///                           has failed. Pass 0 to never timeout.
-    /// - parameter withHandler: The handler to call when the client fails to connect.
+    /// - parameter handler: The handler to call when the client fails to connect.
     @objc
     open func connect(timeoutAfter: Double, withHandler handler: (() -> ())?) {
         assert(timeoutAfter >= 0, "Invalid timeout: \(timeoutAfter)")
@@ -213,7 +213,7 @@ open class SocketIOClient : NSObject, SocketIOClientSpec {
     /// Same as emit, but meant for Objective-C
     ///
     /// - parameter event: The event to send.
-    /// - parameter with: The items to send with this event. Send an empty array to send no data.
+    /// - parameter items: The items to send with this event. Send an empty array to send no data.
     @objc
     open func emit(_ event: String, with items: [Any]) {
         guard status == .connected else {
@@ -270,7 +270,7 @@ open class SocketIOClient : NSObject, SocketIOClientSpec {
     /// ```
     ///
     /// - parameter event: The event to send.
-    /// - parameter with: The items to send with this event. Use `[]` to send nothing.
+    /// - parameter items: The items to send with this event. Use `[]` to send nothing.
     /// - returns: An `OnAckCallback`. You must call the `timingOut(after:)` method before the event will be sent.
     @objc
     open func emitWithAck(_ event: String, with items: [Any]) -> OnAckCallback {
@@ -314,11 +314,11 @@ open class SocketIOClient : NSObject, SocketIOClientSpec {
     /// - parameter data: The data sent back with this ack.
     @objc
     open func handleAck(_ ack: Int, data: [Any]) {
-        guard status == .connected, let manager = self.manager else { return }
+        guard status == .connected else { return }
 
         DefaultSocketLogger.Logger.log("Handling ack: \(ack) with data: \(data)", type: logType)
 
-        ackHandlers.executeAck(ack, with: data, onQueue: manager.handleQueue)
+        ackHandlers.executeAck(ack, with: data)
     }
 
     /// Called on socket.io specific events.
@@ -334,7 +334,7 @@ open class SocketIOClient : NSObject, SocketIOClientSpec {
     /// - parameter event: The name of the event.
     /// - parameter data: The data that was sent with this event.
     /// - parameter isInternalMessage: Whether this event was sent internally. If `true` it is always sent to handlers.
-    /// - parameter withAck: If > 0 then this event expects to get an ack back from the client.
+    /// - parameter ack: If > 0 then this event expects to get an ack back from the client.
     @objc
     open func handleEvent(_ event: String, data: [Any], isInternalMessage: Bool, withAck ack: Int = -1) {
         guard status == .connected || isInternalMessage else { return }
diff --git a/Source/SocketIO/Client/SocketIOClientSpec.swift b/Source/SocketIO/Client/SocketIOClientSpec.swift
index 26e8e60..739c7e9 100644
--- a/Source/SocketIO/Client/SocketIOClientSpec.swift
+++ b/Source/SocketIO/Client/SocketIOClientSpec.swift
@@ -59,7 +59,7 @@ public protocol SocketIOClientSpec : class {
     ///
     /// - parameter timeoutAfter: The number of seconds after which if we are not connected we assume the connection
     ///                           has failed. Pass 0 to never timeout.
-    /// - parameter withHandler: The handler to call when the client fails to connect.
+    /// - parameter handler: The handler to call when the client fails to connect.
     func connect(timeoutAfter: Double, withHandler handler: (() -> ())?)
 
     /// Called when the client connects to a namespace. If the client was created with a namespace upfront,
@@ -134,7 +134,7 @@ public protocol SocketIOClientSpec : class {
     /// - parameter event: The name of the event.
     /// - parameter data: The data that was sent with this event.
     /// - parameter isInternalMessage: Whether this event was sent internally. If `true` it is always sent to handlers.
-    /// - parameter withAck: If > 0 then this event expects to get an ack back from the client.
+    /// - parameter ack: If > 0 then this event expects to get an ack back from the client.
     func handleEvent(_ event: String, data: [Any], isInternalMessage: Bool, withAck ack: Int)
 
     /// Causes a client to handle a socket.io packet. The namespace for the packet must match the namespace of the
diff --git a/Source/SocketIO/Engine/SocketEngine.swift b/Source/SocketIO/Engine/SocketEngine.swift
index 6b6df7a..fc1c1ad 100644
--- a/Source/SocketIO/Engine/SocketEngine.swift
+++ b/Source/SocketIO/Engine/SocketEngine.swift
@@ -280,7 +280,6 @@ public final class SocketEngine : NSObject, URLSessionDelegate, SocketEnginePoll
     }
 
     private func createWebSocketAndConnect() {
-        ws?.delegate = nil // TODO this seems a bit defensive, is this really needed?
         var req = URLRequest(url: urlWebSocketWithSid)
 
         addHeaders(to: &req)
@@ -288,10 +287,33 @@ public final class SocketEngine : NSObject, URLSessionDelegate, SocketEnginePoll
         ws = WebSocket(request: req)
         ws?.callbackQueue = engineQueue
         ws?.enableCompression = compress
-        ws?.delegate = self
         ws?.disableSSLCertValidation = selfSigned
         ws?.security = security?.security
 
+        ws?.onConnect = {[weak self] in
+            guard let this = self else { return }
+
+            this.websocketDidConnect()
+        }
+
+        ws?.onDisconnect = {[weak self] error in
+            guard let this = self else { return }
+
+            this.websocketDidDisconnect(error: error)
+        }
+
+        ws?.onData = {[weak self] data in
+            guard let this = self else { return }
+
+            this.parseEngineData(data)
+        }
+
+        ws?.onText = {[weak self] message in
+            guard let this = self else { return }
+
+            this.parseEngineMessage(message)
+        }
+
         ws?.connect()
     }
 
@@ -461,8 +483,6 @@ public final class SocketEngine : NSObject, URLSessionDelegate, SocketEnginePoll
     /// Parses a raw engine.io packet.
     ///
     /// - parameter message: The message to parse.
-    /// - parameter fromPolling: Whether this message is from long-polling.
-    ///                          If `true` we might have to fix utf8 encoding.
     public func parseEngineMessage(_ message: String) {
         DefaultSocketLogger.Logger.log("Got message: \(message)", type: SocketEngine.logType)
 
@@ -586,8 +606,8 @@ public final class SocketEngine : NSObject, URLSessionDelegate, SocketEnginePoll
     /// Writes a message to engine.io, independent of transport.
     ///
     /// - parameter msg: The message to send.
-    /// - parameter withType: The type of this message.
-    /// - parameter withData: Any data that this message has.
+    /// - parameter type: The type of this message.
+    /// - parameter data: Any data that this message has.
     public func write(_ msg: String, withType type: SocketEnginePacketType, withData data: [Data]) {
         engineQueue.async {
             guard self.connected else { return }
@@ -609,10 +629,9 @@ public final class SocketEngine : NSObject, URLSessionDelegate, SocketEnginePoll
         }
     }
 
-    // MARK: Starscream delegate conformance
+    // WebSocket Methods
 
-    /// Delegate method for connection.
-    public func websocketDidConnect(socket: WebSocketClient) {
+    private func websocketDidConnect() {
         if !forceWebsockets {
             probing = true
             probeWebSocket()
@@ -623,8 +642,7 @@ public final class SocketEngine : NSObject, URLSessionDelegate, SocketEnginePoll
         }
     }
 
-    /// Delegate method for disconnection.
-    public func websocketDidDisconnect(socket: WebSocketClient, error: Error?) {
+    private func websocketDidDisconnect(error: Error?) {
         probing = false
 
         if closed {
diff --git a/Source/SocketIO/Engine/SocketEngineSpec.swift b/Source/SocketIO/Engine/SocketEngineSpec.swift
index 59ba6b6..fa08519 100644
--- a/Source/SocketIO/Engine/SocketEngineSpec.swift
+++ b/Source/SocketIO/Engine/SocketEngineSpec.swift
@@ -130,15 +130,13 @@ import Starscream
     /// Parses a raw engine.io packet.
     ///
     /// - parameter message: The message to parse.
-    /// - parameter fromPolling: Whether this message is from long-polling.
-    ///                          If `true` we might have to fix utf8 encoding.
     func parseEngineMessage(_ message: String)
 
     /// Writes a message to engine.io, independent of transport.
     ///
     /// - parameter msg: The message to send.
-    /// - parameter withType: The type of this message.
-    /// - parameter withData: Any data that this message has.
+    /// - parameter type: The type of this message.
+    /// - parameter data: Any data that this message has.
     func write(_ msg: String, withType type: SocketEnginePacketType, withData data: [Data])
 }
 
diff --git a/Source/SocketIO/Engine/SocketEngineWebsocket.swift b/Source/SocketIO/Engine/SocketEngineWebsocket.swift
index 97a4a72..6dc11ac 100644
--- a/Source/SocketIO/Engine/SocketEngineWebsocket.swift
+++ b/Source/SocketIO/Engine/SocketEngineWebsocket.swift
@@ -27,7 +27,7 @@ import Foundation
 import Starscream
 
 /// Protocol that is used to implement socket.io WebSocket support
-public protocol SocketEngineWebsocket : SocketEngineSpec, WebSocketDelegate {
+public protocol SocketEngineWebsocket : SocketEngineSpec {
     // MARK: Methods
 
     /// Sends an engine.io message through the WebSocket transport.
@@ -66,16 +66,4 @@ extension SocketEngineWebsocket {
             }
         }
     }
-
-    // MARK: Starscream delegate methods
-
-    /// Delegate method for when a message is received.
-    public func websocketDidReceiveMessage(socket: WebSocketClient, text: String) {
-        parseEngineMessage(text)
-    }
-
-    /// Delegate method for when binary is received.
-    public func websocketDidReceiveData(socket: WebSocketClient, data: Data) {
-        parseEngineData(data)
-    }
 }
diff --git a/Source/SocketIO/Manager/SocketManager.swift b/Source/SocketIO/Manager/SocketManager.swift
index 9d04d1e..e4fbf7d 100644
--- a/Source/SocketIO/Manager/SocketManager.swift
+++ b/Source/SocketIO/Manager/SocketManager.swift
@@ -241,7 +241,7 @@ open class SocketManager : NSObject, SocketManagerSpec, SocketParsable, SocketDa
     /// This will remove the socket for the manager's control, and make the socket instance useless and ready for
     /// releasing.
     ///
-    /// - parameter forNamespace: The namespace to disconnect from.
+    /// - parameter nsp: The namespace to disconnect from.
     open func disconnectSocket(forNamespace nsp: String) {
         guard let socket = nsps.removeValue(forKey: nsp) else {
             DefaultSocketLogger.Logger.log("Could not find socket for \(nsp) to disconnect",
@@ -282,7 +282,7 @@ open class SocketManager : NSObject, SocketManagerSpec, SocketParsable, SocketDa
     /// Same as `emitAll(_:_:)`, but meant for Objective-C.
     ///
     /// - parameter event: The event to send.
-    /// - parameter withItems: The data to send with this event.
+    /// - parameter items: The data to send with this event.
     open func emitAll(_ event: String, withItems items: [Any]) {
         forAll {socket in
             socket.emit(event, with: items)
@@ -508,7 +508,7 @@ open class SocketManager : NSObject, SocketManagerSpec, SocketParsable, SocketDa
     /// Call one of the `disconnectSocket` methods on this class to remove the socket from manager control.
     /// Or call `SocketIOClient.disconnect()` on the client.
     ///
-    /// - parameter forNamespace: The namespace for the socket.
+    /// - parameter nsp: The namespace for the socket.
     /// - returns: A `SocketIOClient` for the given namespace.
     open func socket(forNamespace nsp: String) -> SocketIOClient {
         assert(nsp.hasPrefix("/"), "forNamespace must have a leading /")
diff --git a/Source/SocketIO/Manager/SocketManagerSpec.swift b/Source/SocketIO/Manager/SocketManagerSpec.swift
index 52bdcab..79f0e98 100644
--- a/Source/SocketIO/Manager/SocketManagerSpec.swift
+++ b/Source/SocketIO/Manager/SocketManagerSpec.swift
@@ -103,13 +103,13 @@ public protocol SocketManagerSpec : class, SocketEngineClient {
 
     /// Disconnects the socket associated with `forNamespace`.
     ///
-    /// - parameter forNamespace: The namespace to disconnect from.
+    /// - parameter nsp: The namespace to disconnect from.
     func disconnectSocket(forNamespace nsp: String)
 
     /// Sends an event to the server on all namespaces in this manager.
     ///
     /// - parameter event: The event to send.
-    /// - parameter withItems: The data to send with this event.
+    /// - parameter items: The data to send with this event.
     func emitAll(_ event: String, withItems items: [Any])
 
     /// Tries to reconnect to the server.
@@ -133,7 +133,7 @@ public protocol SocketManagerSpec : class, SocketEngineClient {
     /// Call one of the `disconnectSocket` methods on the implementing class to remove the socket from manager control.
     /// Or call `SocketIOClient.disconnect()` on the client.
     ///
-    /// - parameter forNamespace: The namespace for the socket.
+    /// - parameter nsp: The namespace for the socket.
     /// - returns: A `SocketIOClient` for the given namespace.
     func socket(forNamespace nsp: String) -> SocketIOClient
 }
diff --git a/Tests/TestSocketIO/SocketAckManagerTest.swift b/Tests/TestSocketIO/SocketAckManagerTest.swift
index 455c5b9..b4f7b5d 100644
--- a/Tests/TestSocketIO/SocketAckManagerTest.swift
+++ b/Tests/TestSocketIO/SocketAckManagerTest.swift
@@ -21,7 +21,7 @@ class SocketAckManagerTest : XCTestCase {
         }
 
         ackManager.addAck(1, callback: callback)
-        ackManager.executeAck(1, with: itemsArray, onQueue: DispatchQueue.main)
+        ackManager.executeAck(1, with: itemsArray)
 
         waitForExpectations(timeout: 3.0, handler: nil)
     }
@@ -44,7 +44,7 @@ class SocketAckManagerTest : XCTestCase {
         }
 
         ackManager.addAck(1, callback: callback)
-        ackManager.timeoutAck(1, onQueue: DispatchQueue.main)
+        ackManager.timeoutAck(1)
 
         waitForExpectations(timeout: 0.2, handler: nil)
     }
diff --git a/Tests/TestSocketIO/SocketSideEffectTest.swift b/Tests/TestSocketIO/SocketSideEffectTest.swift
index 156fe4d..5c8a77d 100644
--- a/Tests/TestSocketIO/SocketSideEffectTest.swift
+++ b/Tests/TestSocketIO/SocketSideEffectTest.swift
@@ -38,6 +38,19 @@ class SocketSideEffectTest: XCTestCase {
         waitForExpectations(timeout: 3, handler: nil)
     }
 
+    func testHandleAckWithAckEmit() {
+        let expect = expectation(description: "handled ack")
+        socket.emitWithAck("test").timingOut(after: 0) {data in
+            XCTAssertEqual(data[0] as? String, "hello world")
+
+            self.socket.emitWithAck("test").timingOut(after: 0) {data in}
+            expect.fulfill()
+        }
+
+        manager.parseEngineMessage("30[\"hello world\"]")
+        waitForExpectations(timeout: 3, handler: nil)
+    }
+
     func testHandleAck2() {
         let expect = expectation(description: "handled ack2")
         socket.emitWithAck("test").timingOut(after: 0) {data in