diff --git a/OpenVPN Adapter.xcodeproj/project.pbxproj b/OpenVPN Adapter.xcodeproj/project.pbxproj
index b834c95..86187e9 100644
--- a/OpenVPN Adapter.xcodeproj/project.pbxproj	
+++ b/OpenVPN Adapter.xcodeproj/project.pbxproj	
@@ -743,6 +743,7 @@
 					};
 					C9D2ABF21EA212A3007EDF9D = {
 						DevelopmentTeam = 2TWXCGG7R3;
+						LastSwiftMigration = 0900;
 					};
 				};
 			};
@@ -1340,7 +1341,8 @@
 				SUPPORTED_PLATFORMS = macosx;
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 3.0;
+				SWIFT_SWIFT3_OBJC_INFERENCE = On;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Debug;
 		};
@@ -1386,7 +1388,8 @@
 				SDKROOT = macosx;
 				SUPPORTED_PLATFORMS = macosx;
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
-				SWIFT_VERSION = 3.0;
+				SWIFT_SWIFT3_OBJC_INFERENCE = On;
+				SWIFT_VERSION = 4.0;
 				VALIDATE_PRODUCT = YES;
 			};
 			name = Release;