diff --git a/Socket.IO-Client-Swift.xcodeproj/project.pbxproj b/Socket.IO-Client-Swift.xcodeproj/project.pbxproj
index feaabdd..22fd0f0 100644
--- a/Socket.IO-Client-Swift.xcodeproj/project.pbxproj
+++ b/Socket.IO-Client-Swift.xcodeproj/project.pbxproj
@@ -537,7 +537,7 @@
 				TargetAttributes = {
 					572EF2181B51F16C00EEBB58 = {
 						CreatedOnToolsVersion = 6.4;
-						LastSwiftMigration = 0920;
+						LastSwiftMigration = 1010;
 					};
 					572EF2231B51F16C00EEBB58 = {
 						CreatedOnToolsVersion = 6.4;
@@ -889,7 +889,7 @@
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
 				SWIFT_SWIFT3_OBJC_INFERENCE = On;
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 4.2;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
@@ -941,7 +941,7 @@
 				SDKROOT = iphoneos;
 				SKIP_INSTALL = YES;
 				SWIFT_SWIFT3_OBJC_INFERENCE = On;
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 4.2;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				VALIDATE_PRODUCT = YES;
 				VERSIONING_SYSTEM = "apple-generic";
diff --git a/Source/SocketEngine.swift b/Source/SocketEngine.swift
index 0c87622..dea3b48 100644
--- a/Source/SocketEngine.swift
+++ b/Source/SocketEngine.swift
@@ -226,7 +226,8 @@ public final class SocketEngine : NSObject, URLSessionDelegate, SocketEnginePoll
     private func handleBase64(message: String) {
         // binary in base64 string
         let noPrefix = String(message[message.index(message.startIndex, offsetBy: 2)..<message.endIndex])
-        if let data = NSData(base64Encoded: noPrefix, options: .ignoreUnknownCharacters) {
+
+        if let data = Data(base64Encoded: noPrefix, options: .ignoreUnknownCharacters) {
             client?.parseEngineBinaryData(data as Data)
         }
     }