diff --git a/Sources/SwiftyTimer.swift b/Sources/SwiftyTimer.swift
index 519e720..d281c7e 100644
--- a/Sources/SwiftyTimer.swift
+++ b/Sources/SwiftyTimer.swift
@@ -104,8 +104,8 @@ extension Timer {
     /// By default, the timer is scheduled on the current run loop for the default mode.
     /// Specify `runLoop` or `modes` to override these defaults.
     
-    public func start(runLoop: RunLoop = .current, modes: RunLoopMode...) {
-        let modes = modes.isEmpty ? [.defaultRunLoopMode] : modes
+    public func start(runLoop: RunLoop = .current, modes: RunLoop.Mode...) {
+        let modes = modes.isEmpty ? [RunLoop.Mode.default] : modes
         
         for mode in modes {
             runLoop.add(self, forMode: mode)
diff --git a/SwiftyTimer.xcodeproj/project.pbxproj b/SwiftyTimer.xcodeproj/project.pbxproj
index 70f8d1b..9b62a24 100644
--- a/SwiftyTimer.xcodeproj/project.pbxproj
+++ b/SwiftyTimer.xcodeproj/project.pbxproj
@@ -355,7 +355,7 @@
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = iphoneos;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.2;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
@@ -400,7 +400,7 @@
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.2;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				VALIDATE_PRODUCT = YES;
 				VERSIONING_SYSTEM = "apple-generic";