diff --git a/Socket.IO-Client-Swift.xcodeproj/project.pbxproj b/Socket.IO-Client-Swift.xcodeproj/project.pbxproj
index fff36e3..49d2e7a 100644
--- a/Socket.IO-Client-Swift.xcodeproj/project.pbxproj
+++ b/Socket.IO-Client-Swift.xcodeproj/project.pbxproj
@@ -782,6 +782,7 @@
 				ONLY_ACTIVE_ARCH = YES;
 				PRODUCT_NAME = SocketIO;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+				SWIFT_VERSION = 2.3;
 				TVOS_DEPLOYMENT_TARGET = 9.0;
 				WATCHOS_DEPLOYMENT_TARGET = 2.0;
 			};
@@ -797,6 +798,7 @@
 				MACOSX_DEPLOYMENT_TARGET = 10.10;
 				PRODUCT_NAME = SocketIO;
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
+				SWIFT_VERSION = 2.3;
 				TVOS_DEPLOYMENT_TARGET = 9.0;
 				WATCHOS_DEPLOYMENT_TARGET = 2.0;
 			};
@@ -1059,7 +1061,6 @@
 				SDKROOT = macosx;
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 2.3;
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
 			};
@@ -1111,7 +1112,6 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "io.socket.$(PRODUCT_NAME:rfc1034identifier)";
 				SDKROOT = macosx;
 				SKIP_INSTALL = YES;
-				SWIFT_VERSION = 2.3;
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
 			};