diff --git a/Socket.IO-Client-Swift.xcodeproj/project.pbxproj b/Socket.IO-Client-Swift.xcodeproj/project.pbxproj
index 809a0de..feaabdd 100644
--- a/Socket.IO-Client-Swift.xcodeproj/project.pbxproj
+++ b/Socket.IO-Client-Swift.xcodeproj/project.pbxproj
@@ -1102,7 +1102,7 @@
 				SDKROOT = macosx;
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
 			};
@@ -1154,7 +1154,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "io.socket.$(PRODUCT_NAME:rfc1034identifier)";
 				SDKROOT = macosx;
 				SKIP_INSTALL = YES;
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
 			};
@@ -1313,6 +1313,7 @@
 				SDKROOT = appletvos;
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+				SWIFT_VERSION = 4.0;
 				TARGETED_DEVICE_FAMILY = 3;
 				TVOS_DEPLOYMENT_TARGET = 9.0;
 				VERSIONING_SYSTEM = "apple-generic";
@@ -1364,6 +1365,7 @@
 				PRODUCT_NAME = SocketIO;
 				SDKROOT = appletvos;
 				SKIP_INSTALL = YES;
+				SWIFT_VERSION = 4.0;
 				TARGETED_DEVICE_FAMILY = 3;
 				TVOS_DEPLOYMENT_TARGET = 9.0;
 				VALIDATE_PRODUCT = YES;
diff --git a/Source/SocketEngine.swift b/Source/SocketEngine.swift
index 8f9a85b..0c87622 100644
--- a/Source/SocketEngine.swift
+++ b/Source/SocketEngine.swift
@@ -540,7 +540,7 @@ public final class SocketEngine : NSObject, URLSessionDelegate, SocketEnginePoll
         case .pong:
             handlePong(with: fixedString)
         case .open:
-            handleOpen(openData: fixedString)
+            handleOpen(openData: String(fixedString.dropFirst()))
         case .close:
             handleClose(fixedString)
         default: