diff --git a/Minesweeper.xcodeproj/project.pbxproj b/Minesweeper.xcodeproj/project.pbxproj
index ae2737f..32e0a10 100644
--- a/Minesweeper.xcodeproj/project.pbxproj
+++ b/Minesweeper.xcodeproj/project.pbxproj
@@ -192,7 +192,7 @@
 			attributes = {
 				BuildIndependentTargetsInParallel = 1;
 				LastSwiftUpdateCheck = 1330;
-				LastUpgradeCheck = 1420;
+				LastUpgradeCheck = 1520;
 				TargetAttributes = {
 					3B5AB53727F96F710059BB0A = {
 						CreatedOnToolsVersion = 13.3;
@@ -317,6 +317,7 @@
 				DEBUG_INFORMATION_FORMAT = dwarf;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				ENABLE_TESTABILITY = YES;
+				ENABLE_USER_SCRIPT_SANDBOXING = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu11;
 				GCC_DYNAMIC_NO_PIC = NO;
 				GCC_NO_COMMON_BLOCKS = YES;
@@ -378,6 +379,7 @@
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
 				ENABLE_NS_ASSERTIONS = NO;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				ENABLE_USER_SCRIPT_SANDBOXING = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu11;
 				GCC_NO_COMMON_BLOCKS = YES;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
diff --git a/Minesweeper/Settings/GeneralViewController.swift b/Minesweeper/Settings/GeneralViewController.swift
index 89ad8e5..bd0dafb 100644
--- a/Minesweeper/Settings/GeneralViewController.swift
+++ b/Minesweeper/Settings/GeneralViewController.swift
@@ -49,6 +49,7 @@ class GeneralViewController: NSViewController {
     
     @IBAction func toolbarDifficultyCheckboxClicked(_ sender: NSButton) {
         Defaults[.toolbarDifficulty].toggle()
+        NotificationCenter.default.post(name: Notification.Name("SetSubtitle"), object: nil)
     }
     
     @IBAction func appearancePopUpChanged(_ sender: NSPopUpButton) {
diff --git a/Minesweeper/ViewController.swift b/Minesweeper/ViewController.swift
index 413d840..9d2de96 100644
--- a/Minesweeper/ViewController.swift
+++ b/Minesweeper/ViewController.swift
@@ -18,6 +18,8 @@ class ViewController: NSViewController {
     override func viewDidLoad() {
         super.viewDidLoad()
         
+        NotificationCenter.default.addObserver(self, selector: #selector(self.setSubtitle(notification:)), name: Notification.Name("SetSubtitle"), object: nil)
+        
         if let view = self.skView {
             let rows, cols, mines: Int
             
@@ -48,4 +50,12 @@ class ViewController: NSViewController {
             view.window!.subtitle = difficulty
         }
     }
+    
+    @objc func setSubtitle(notification: Notification) {
+        if Defaults[.toolbarDifficulty] {
+            view.window!.subtitle = difficulty
+        } else {
+            view.window!.subtitle = ""
+        }
+    }
 }