diff --git a/SentimentPolarity.xcodeproj/project.pbxproj b/SentimentPolarity.xcodeproj/project.pbxproj
index 391f0f7..bd5bd86 100644
--- a/SentimentPolarity.xcodeproj/project.pbxproj
+++ b/SentimentPolarity.xcodeproj/project.pbxproj
@@ -105,11 +105,12 @@
 			isa = PBXProject;
 			attributes = {
 				LastSwiftUpdateCheck = 0900;
-				LastUpgradeCheck = 0900;
+				LastUpgradeCheck = 1000;
 				ORGANIZATIONNAME = "Vadym Markov";
 				TargetAttributes = {
 					D56F32951F16317A00FE4DA9 = {
 						CreatedOnToolsVersion = 9.0;
+						LastSwiftMigration = 1000;
 						ProvisioningStyle = Manual;
 					};
 				};
@@ -174,12 +175,16 @@
 				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;
@@ -229,12 +234,16 @@
 				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;
@@ -274,7 +283,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "codes.cocoa-ai.SentimentPolarity";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				PROVISIONING_PROFILE_SPECIFIER = "";
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 4.2;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Debug;
@@ -290,7 +299,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "codes.cocoa-ai.SentimentPolarity";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				PROVISIONING_PROFILE_SPECIFIER = "";
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 4.2;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Release;
@@ -314,6 +323,7 @@
 				D56F32AA1F16317A00FE4DA9 /* Release */,
 			);
 			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
 		};
 /* End XCConfigurationList section */
 	};
diff --git a/SentimentPolarity.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist b/SentimentPolarity.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
new file mode 100644
index 0000000..18d9810
--- /dev/null
+++ b/SentimentPolarity.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/SentimentPolarity/AppDelegate.swift b/SentimentPolarity/AppDelegate.swift
index 884a368..505d930 100644
--- a/SentimentPolarity/AppDelegate.swift
+++ b/SentimentPolarity/AppDelegate.swift
@@ -9,7 +9,7 @@ final class AppDelegate: UIResponder, UIApplicationDelegate {
   // MARK: - Application lifecycle
 
   func application(_ application: UIApplication,
-                   didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
+                   didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
     window = UIWindow()
     window?.rootViewController = navigationController
     window?.makeKeyAndVisible()
diff --git a/SentimentPolarity/ViewController.swift b/SentimentPolarity/ViewController.swift
index 92a296b..b9c6c95 100644
--- a/SentimentPolarity/ViewController.swift
+++ b/SentimentPolarity/ViewController.swift
@@ -32,7 +32,7 @@ final class ViewController: UIViewController {
     NotificationCenter.default.addObserver(
       self,
       selector: #selector(keyboardDidShow(notification:)),
-      name: .UIKeyboardDidShow,
+      name: UIResponder.keyboardDidShowNotification,
       object: nil
     )
 
@@ -55,7 +55,7 @@ final class ViewController: UIViewController {
   // MARK: - Actions
 
   @objc private func keyboardDidShow(notification: NSNotification) {
-    let frameObject = notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as AnyObject
+    let frameObject = notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as AnyObject
     if let keyboardRect = frameObject.cgRectValue {
       textViewBottomConstraint?.constant = -keyboardRect.size.height - padding
       view.layoutIfNeeded()