diff --git a/Sources/SwiftyTimer.swift b/Sources/SwiftyTimer.swift
index 519e720..bbc78f3 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 ? [.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..96d93b1 100644
--- a/SwiftyTimer.xcodeproj/project.pbxproj
+++ b/SwiftyTimer.xcodeproj/project.pbxproj
@@ -205,7 +205,7 @@
 		3E721AB21BF7255C008AF027 /* Project object */ = {
 			isa = PBXProject;
 			attributes = {
-				LastUpgradeCheck = 0800;
+				LastUpgradeCheck = 1000;
 				ORGANIZATIONNAME = "Radosław Pietruszewski";
 				TargetAttributes = {
 					3E721ABA1BF7255D008AF027 = {
@@ -318,14 +318,22 @@
 				CLANG_CXX_LIBRARY = "libc++";
 				CLANG_ENABLE_MODULES = YES;
 				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
 				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_COMMA = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
 				CLANG_WARN_EMPTY_BODY = YES;
 				CLANG_WARN_ENUM_CONVERSION = YES;
 				CLANG_WARN_INFINITE_RECURSION = YES;
 				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
+				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
 				CLANG_WARN_SUSPICIOUS_MOVE = YES;
 				CLANG_WARN_UNREACHABLE_CODE = YES;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
@@ -370,14 +378,22 @@
 				CLANG_CXX_LIBRARY = "libc++";
 				CLANG_ENABLE_MODULES = YES;
 				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
 				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_COMMA = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
 				CLANG_WARN_EMPTY_BODY = YES;
 				CLANG_WARN_ENUM_CONVERSION = YES;
 				CLANG_WARN_INFINITE_RECURSION = YES;
 				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
+				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
 				CLANG_WARN_SUSPICIOUS_MOVE = YES;
 				CLANG_WARN_UNREACHABLE_CODE = YES;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
@@ -425,6 +441,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = io.radex.SwiftyTimer;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
+				SWIFT_VERSION = 4.2;
 			};
 			name = Debug;
 		};
@@ -445,6 +462,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = io.radex.SwiftyTimer;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
+				SWIFT_VERSION = 4.2;
 			};
 			name = Release;
 		};
diff --git a/SwiftyTimer.xcodeproj/xcshareddata/xcschemes/SwiftyTimer OS X.xcscheme b/SwiftyTimer.xcodeproj/xcshareddata/xcschemes/SwiftyTimer OS X.xcscheme
index fd51c27..ada9aa8 100644
--- a/SwiftyTimer.xcodeproj/xcshareddata/xcschemes/SwiftyTimer OS X.xcscheme	
+++ b/SwiftyTimer.xcodeproj/xcshareddata/xcschemes/SwiftyTimer OS X.xcscheme	
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0800"
+   LastUpgradeVersion = "1000"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
diff --git a/SwiftyTimer.xcodeproj/xcshareddata/xcschemes/SwiftyTimer tvOS.xcscheme b/SwiftyTimer.xcodeproj/xcshareddata/xcschemes/SwiftyTimer tvOS.xcscheme
index 036a2ac..ee96e38 100644
--- a/SwiftyTimer.xcodeproj/xcshareddata/xcschemes/SwiftyTimer tvOS.xcscheme	
+++ b/SwiftyTimer.xcodeproj/xcshareddata/xcschemes/SwiftyTimer tvOS.xcscheme	
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0800"
+   LastUpgradeVersion = "1000"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
diff --git a/SwiftyTimer.xcodeproj/xcshareddata/xcschemes/SwiftyTimer watchOS.xcscheme b/SwiftyTimer.xcodeproj/xcshareddata/xcschemes/SwiftyTimer watchOS.xcscheme
index 31dc3e3..f37f5fc 100644
--- a/SwiftyTimer.xcodeproj/xcshareddata/xcschemes/SwiftyTimer watchOS.xcscheme	
+++ b/SwiftyTimer.xcodeproj/xcshareddata/xcschemes/SwiftyTimer watchOS.xcscheme	
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0800"
+   LastUpgradeVersion = "1000"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
diff --git a/SwiftyTimer.xcodeproj/xcshareddata/xcschemes/SwiftyTimer.xcscheme b/SwiftyTimer.xcodeproj/xcshareddata/xcschemes/SwiftyTimer.xcscheme
index 897a69b..6cf4dbc 100644
--- a/SwiftyTimer.xcodeproj/xcshareddata/xcschemes/SwiftyTimer.xcscheme
+++ b/SwiftyTimer.xcodeproj/xcshareddata/xcschemes/SwiftyTimer.xcscheme
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0800"
+   LastUpgradeVersion = "1000"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"