diff --git a/ReactiveTask.xcodeproj/project.pbxproj b/ReactiveTask.xcodeproj/project.pbxproj
index 5594577..d6e072b 100644
--- a/ReactiveTask.xcodeproj/project.pbxproj
+++ b/ReactiveTask.xcodeproj/project.pbxproj
@@ -371,7 +371,7 @@
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = macosx;
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 4.2;
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
 			};
@@ -393,7 +393,7 @@
 				SDKROOT = macosx;
 				SWIFT_COMPILATION_MODE = wholemodule;
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 4.2;
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
 			};
@@ -409,7 +409,6 @@
 				INFOPLIST_FILE = Sources/Info.plist;
 				PRODUCT_BUNDLE_IDENTIFIER = "org.carthage.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 4.2;
 			};
 			name = Debug;
 		};
@@ -423,7 +422,6 @@
 				INFOPLIST_FILE = Sources/Info.plist;
 				PRODUCT_BUNDLE_IDENTIFIER = "org.carthage.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 4.2;
 			};
 			name = Release;
 		};
@@ -439,7 +437,6 @@
 				MACOSX_DEPLOYMENT_TARGET = 10.10;
 				PRODUCT_BUNDLE_IDENTIFIER = "org.carthage.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 4.2;
 			};
 			name = Debug;
 		};
@@ -455,7 +452,6 @@
 				MACOSX_DEPLOYMENT_TARGET = 10.10;
 				PRODUCT_BUNDLE_IDENTIFIER = "org.carthage.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 4.2;
 			};
 			name = Release;
 		};
@@ -474,7 +470,7 @@
 				MACOSX_DEPLOYMENT_TARGET = 10.9;
 				SDKROOT = macosx;
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 4.2;
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
 			};
@@ -490,7 +486,6 @@
 				INFOPLIST_FILE = Sources/Info.plist;
 				PRODUCT_BUNDLE_IDENTIFIER = "org.carthage.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 4.2;
 			};
 			name = Test;
 		};
@@ -506,7 +501,6 @@
 				MACOSX_DEPLOYMENT_TARGET = 10.10;
 				PRODUCT_BUNDLE_IDENTIFIER = "org.carthage.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 4.2;
 			};
 			name = Test;
 		};
@@ -525,7 +519,7 @@
 				MACOSX_DEPLOYMENT_TARGET = 10.9;
 				SDKROOT = macosx;
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 4.2;
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
 			};
@@ -541,7 +535,6 @@
 				INFOPLIST_FILE = Sources/Info.plist;
 				PRODUCT_BUNDLE_IDENTIFIER = "org.carthage.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 4.2;
 			};
 			name = Profile;
 		};
@@ -557,7 +550,6 @@
 				MACOSX_DEPLOYMENT_TARGET = 10.10;
 				PRODUCT_BUNDLE_IDENTIFIER = "org.carthage.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 4.2;
 			};
 			name = Profile;
 		};