diff --git a/Demo/StoryboardConstraint.xcodeproj/project.pbxproj b/Demo/StoryboardConstraint.xcodeproj/project.pbxproj
index 29371d3..26bd5ae 100644
--- a/Demo/StoryboardConstraint.xcodeproj/project.pbxproj
+++ b/Demo/StoryboardConstraint.xcodeproj/project.pbxproj
@@ -104,7 +104,7 @@
 			isa = PBXProject;
 			attributes = {
 				LastSwiftUpdateCheck = 0820;
-				LastUpgradeCheck = 0820;
+				LastUpgradeCheck = 1010;
 				ORGANIZATIONNAME = "Dimitri Giani";
 				TargetAttributes = {
 					47D8A65F1E585CF000138F70 = {
@@ -188,15 +188,23 @@
 				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_DOCUMENTATION_COMMENTS = YES;
 				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;
@@ -225,6 +233,7 @@
 				SDKROOT = iphoneos;
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+				SWIFT_VERSION = 4.2;
 			};
 			name = Debug;
 		};
@@ -237,15 +246,23 @@
 				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_DOCUMENTATION_COMMENTS = YES;
 				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;
@@ -266,6 +283,7 @@
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
+				SWIFT_VERSION = 4.2;
 				VALIDATE_PRODUCT = YES;
 			};
 			name = Release;
@@ -280,7 +298,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = com.applications.dimix.StoryboardConstraint;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 4.2;
 			};
 			name = Debug;
 		};
@@ -294,7 +312,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = com.applications.dimix.StoryboardConstraint;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 4.2;
 			};
 			name = Release;
 		};
diff --git a/Demo/StoryboardConstraint.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist b/Demo/StoryboardConstraint.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
new file mode 100644
index 0000000..18d9810
--- /dev/null
+++ b/Demo/StoryboardConstraint.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>
diff --git a/Demo/StoryboardConstraint/AppDelegate.swift b/Demo/StoryboardConstraint/AppDelegate.swift
index c8920d4..6a7e3c1 100644
--- a/Demo/StoryboardConstraint/AppDelegate.swift
+++ b/Demo/StoryboardConstraint/AppDelegate.swift
@@ -14,7 +14,7 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
 	var window: UIWindow?
 
 
-	func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
+    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
 		// Override point for customization after application launch.
 		return true
 	}
diff --git a/StoryboardConstraint/UIView+StoryboardConstraint.swift b/StoryboardConstraint/UIView+StoryboardConstraint.swift
index 7ca24bd..5aaf1d6 100644
--- a/StoryboardConstraint/UIView+StoryboardConstraint.swift
+++ b/StoryboardConstraint/UIView+StoryboardConstraint.swift
@@ -95,7 +95,7 @@ public extension UIView
 	- returns:
 		An optional NSLayoutConstraint
 	*/
-	public func constraint(withAttribute attribute: NSLayoutAttribute, firstItem: UIView? = nil, secondItem: UIView? = nil, searchInSubviews:Bool = false) -> NSLayoutConstraint?
+    public func constraint(withAttribute attribute: NSLayoutConstraint.Attribute, firstItem: UIView? = nil, secondItem: UIView? = nil, searchInSubviews:Bool = false) -> NSLayoutConstraint?
 	{
 		if let constraint = constraints(withAttribute: attribute, firstItem: firstItem, secondItem: secondItem).first
 		{
@@ -124,7 +124,7 @@ public extension UIView
 	- returns:
 		An array of NSLayoutConstraint
 	*/
-	public func constraints(withAttribute attribute: NSLayoutAttribute, firstItem: UIView? = nil, secondItem: UIView? = nil) -> [NSLayoutConstraint]
+    public func constraints(withAttribute attribute: NSLayoutConstraint.Attribute, firstItem: UIView? = nil, secondItem: UIView? = nil) -> [NSLayoutConstraint]
 	{
 		var foundConstraints:[NSLayoutConstraint] = []