diff --git a/Chameleon.xcodeproj/project.pbxproj b/Chameleon.xcodeproj/project.pbxproj
index 271dce6..4d7b377 100755
--- a/Chameleon.xcodeproj/project.pbxproj
+++ b/Chameleon.xcodeproj/project.pbxproj
@@ -660,6 +660,7 @@
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = iphoneos;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+				SWIFT_VERSION = 4.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
@@ -709,6 +710,7 @@
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
+				SWIFT_VERSION = 4.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				VALIDATE_PRODUCT = YES;
 				VERSIONING_SYSTEM = "apple-generic";
@@ -734,7 +736,7 @@
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Debug;
 		};
@@ -755,7 +757,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = com.viccalexander.Chameleon;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Release;
 		};
@@ -780,7 +782,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "com.viccalexander.ChameleonDemo-Swift";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Debug;
@@ -805,7 +807,7 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = "com.viccalexander.ChameleonDemo-Swift";
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Release;
@@ -819,7 +821,7 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = com.viccalexander.ChameleonDemo;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Debug;
 		};
@@ -832,7 +834,7 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = com.viccalexander.ChameleonDemo;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Release;
 		};
diff --git a/ChameleonDemo-Swift/FirstViewController.swift b/ChameleonDemo-Swift/FirstViewController.swift
index 01ef1aa..e573428 100644
--- a/ChameleonDemo-Swift/FirstViewController.swift
+++ b/ChameleonDemo-Swift/FirstViewController.swift
@@ -59,7 +59,7 @@ class FirstViewController: UITableViewController {
         let randomFlatColorContract = ContrastColorOf(randomFlatColor, returnFlat: true)
         // Nav bar
         navigationController?.navigationBar.barTintColor = randomFlatColor
-        navigationController?.navigationBar.titleTextAttributes = [NSForegroundColorAttributeName: randomFlatColorContract]
+        navigationController?.navigationBar.titleTextAttributes = [NSAttributedStringKey.foregroundColor.rawValue: randomFlatColorContract]
         // Tab bar
         tabBarController?.tabBar.barTintColor = randomFlatColor
         tabBarController?.tabBar.tintColor = randomFlatColorContract
diff --git a/ChameleonDemo-Swift/SecondViewController.swift b/ChameleonDemo-Swift/SecondViewController.swift
index a0f1246..e786c26 100644
--- a/ChameleonDemo-Swift/SecondViewController.swift
+++ b/ChameleonDemo-Swift/SecondViewController.swift
@@ -42,7 +42,7 @@ class SecondViewController: UITableViewController {
     
     override func viewDidLoad() {
         super.viewDidLoad()
-        navigationController?.navigationBar.titleTextAttributes = [NSForegroundColorAttributeName: tabBarController?.tabBar.tintColor ?? UIColor.gray]
+        navigationController?.navigationBar.titleTextAttributes = [NSAttributedStringKey.foregroundColor.rawValue: tabBarController?.tabBar.tintColor ?? UIColor.gray]
         navigationController?.navigationBar.barTintColor = tabBarController?.tabBar.barTintColor ?? UIColor.lightGray
         sampleOneImageView.image = #imageLiteral(resourceName: "SampleImageOne")
         sampleTwoImageView.image = #imageLiteral(resourceName: "SampleImageTwo")
@@ -54,7 +54,7 @@ class SecondViewController: UITableViewController {
     }
     
     override func viewWillAppear(_ animated: Bool) {
-        navigationController?.navigationBar.titleTextAttributes = [NSForegroundColorAttributeName: tabBarController?.tabBar.tintColor ?? UIColor.gray]
+        navigationController?.navigationBar.titleTextAttributes = [NSAttributedStringKey.foregroundColor.rawValue: tabBarController?.tabBar.tintColor ?? UIColor.gray]
         navigationController?.navigationBar.barTintColor = tabBarController?.tabBar.barTintColor ?? UIColor.lightGray
     }