diff --git a/README.md b/README.md
index 960e84b..3aa06ea 100644
--- a/README.md
+++ b/README.md
@@ -90,21 +90,21 @@ Carthage
 -----------------
 Add this line to your `Cartfile`:
 ```
-github "socketio/socket.io-client-swift" ~> 6.1.5 # Or latest version
+github "socketio/socket.io-client-swift" ~> 6.1.6 # Or latest version
 ```
 
 Run `carthage update --platform ios,macosx`.
 
-CocoaPods 0.36.0 or later (iOS 8+)
+CocoaPods 1.0.0 or later
 ------------------
 Create `Podfile` and add `pod 'Socket.IO-Client-Swift'`:
 
 ```ruby
-source 'https://github.com/CocoaPods/Specs.git'
-platform :ios, '8.0'
 use_frameworks!
 
-pod 'Socket.IO-Client-Swift', '~> 6.1.5' # Or latest version
+target 'YourApp' do
+    pod 'Socket.IO-Client-Swift', '~> 6.1.6' # Or latest version
+end
 ```
 
 Install pods:
@@ -123,7 +123,7 @@ import SocketIOClientSwift
 Objective-C:
 
 ```Objective-C
-#import <SocketIOClientSwift/SocketIOClientSwift-Swift.h>
+@import SocketIOClientSwift;
 ```
 
 CocoaSeeds
@@ -132,7 +132,7 @@ CocoaSeeds
 Add this line to your `Seedfile`:
 
 ```
-github "socketio/socket.io-client-swift", "v6.1.5", :files => "Source/*.swift" # Or latest version
+github "socketio/socket.io-client-swift", "v6.1.6", :files => "Source/*.swift" # Or latest version
 ```
 
 Run `seed install`.
diff --git a/Socket.IO-Client-Swift.podspec b/Socket.IO-Client-Swift.podspec
index 6e768c1..ae9890b 100644
--- a/Socket.IO-Client-Swift.podspec
+++ b/Socket.IO-Client-Swift.podspec
@@ -1,7 +1,7 @@
 Pod::Spec.new do |s|
   s.name         = "Socket.IO-Client-Swift"
   s.module_name  = "SocketIOClientSwift"
-  s.version      = "6.1.5"
+  s.version      = "6.1.6"
   s.summary      = "Socket.IO-client for iOS and OS X"
   s.description  = <<-DESC
                    Socket.IO-client for iOS and OS X.
@@ -14,7 +14,7 @@ Pod::Spec.new do |s|
   s.ios.deployment_target = '8.0'
   s.osx.deployment_target = '10.10'
   s.tvos.deployment_target = '9.0'
-  s.source       = { :git => "https://github.com/socketio/socket.io-client-swift.git", :tag => 'v6.1.5' }
+  s.source       = { :git => "https://github.com/socketio/socket.io-client-swift.git", :tag => 'v6.1.6' }
   s.source_files  = "Source/**/*.swift"
   s.requires_arc = true
   # s.dependency 'Starscream', '~> 0.9' # currently this repo includes Starscream swift files
diff --git a/Source/SSLSecurity.swift b/Source/SSLSecurity.swift
index 7ed067e..93490ca 100644
--- a/Source/SSLSecurity.swift
+++ b/Source/SSLSecurity.swift
@@ -54,8 +54,8 @@ public class SSLSecurity : NSObject {
     public var validatedDN = true //should the domain name be validated?
     
     var isReady = false //is the key processing done?
-    var certificates: [Data]? //the certificates
-    var pubKeys: [SecKey]? //the public keys
+    var certificates: [NSData]? //the certificates
+    @nonobjc var pubKeys: [SecKey]? //the public keys
     var usePublicKeys = false //use public keys or certificate validation?
     
     /**
@@ -148,7 +148,7 @@ public class SSLSecurity : NSObject {
         SecTrustSetPolicies(trust,policy)
         if self.usePublicKeys {
             if let keys = self.pubKeys {
-                let serverPubKeys = publicKeyChainForTrust(trust)
+                let serverPubKeys = publicKeyChainForTrust(trust: trust)
                 for serverKey in serverPubKeys as [AnyObject] {
                     for key in keys as [AnyObject] {
                         if serverKey.isEqual(key) {
@@ -241,7 +241,7 @@ public class SSLSecurity : NSObject {
      
      - returns: the public keys from the certifcate chain for the trust
      */
-    func publicKeyChainForTrust(_ trust: SecTrust) -> [SecKey] {
+    @nonobjc func publicKeyChainForTrust(trust: SecTrust) -> [SecKey] {
         let policy = SecPolicyCreateBasicX509()
         let keys = (0..<SecTrustGetCertificateCount(trust)).reduce([SecKey]()) { (keys: [SecKey], index: Int) -> [SecKey] in
             var keys = keys
diff --git a/Source/SocketEngine.swift b/Source/SocketEngine.swift
index b01a2e4..fd397c6 100644
--- a/Source/SocketEngine.swift
+++ b/Source/SocketEngine.swift
@@ -24,7 +24,7 @@
 
 import Foundation
 
-public final class SocketEngine : NSObject, SocketEnginePollable, SocketEngineWebsocket {
+public final class SocketEngine : NSObject, URLSessionDelegate, SocketEnginePollable, SocketEngineWebsocket {
     public let emitQueue = DispatchQueue(label: "com.socketio.engineEmitQueue", attributes: DispatchQueueAttributes.serial)
     public let handleQueue = DispatchQueue(label: "com.socketio.engineHandleQueue", attributes: DispatchQueueAttributes.serial)
     public let parseQueue = DispatchQueue(label: "com.socketio.engineParseQueue", attributes: DispatchQueueAttributes.serial)
@@ -103,6 +103,10 @@ public final class SocketEngine : NSObject, SocketEnginePollable, SocketEngineWe
             case let .path(path):
                 socketPath = path
             case let .voipEnabled(enable):
+                if !socketPath.hasSuffix("/") {
+                    socketPath += "/"
+                }
+
                 voipEnabled = enable
             case let .secure(secure):
                 self.secure = secure
@@ -116,7 +120,9 @@ public final class SocketEngine : NSObject, SocketEnginePollable, SocketEngineWe
         }
 
         super.init()
-
+        
+        sessionDelegate = sessionDelegate ?? self
+        
         (urlPolling, urlWebSocket) = createURLs()
     }
 
@@ -204,7 +210,7 @@ public final class SocketEngine : NSObject, SocketEnginePollable, SocketEngineWe
             }
         }
 
-        emitQueue.async { self.doLongPoll(for: reqPolling as URLRequest) }
+        doLongPoll(for: reqPolling as URLRequest)
     }
 
     private func createURLs() -> (URL, URL) {
@@ -453,9 +459,7 @@ public final class SocketEngine : NSObject, SocketEnginePollable, SocketEngineWe
         polling = true
         probing = false
         invalidated = false
-        session = URLSession(configuration: .default,
-            delegate: sessionDelegate,
-            delegateQueue: OperationQueue())
+        session = Foundation.URLSession(configuration: .default, delegate: sessionDelegate, delegateQueue: OperationQueue.main)
         sid = ""
         waitingForPoll = false
         waitingForPost = false
@@ -546,3 +550,11 @@ public final class SocketEngine : NSObject, SocketEnginePollable, SocketEngineWe
         }
     }
 }
+
+extension SocketEngine {
+    public func URLSession(session: URLSession, didBecomeInvalidWithError error: NSError?) {
+        DefaultSocketLogger.Logger.error("Engine URLSession became invalid", type: "SocketEngine")
+        
+        didError(reason: "Engine URLSession became invalid")
+    }
+}