diff --git a/Package.swift b/Package.swift
new file mode 100644
index 0000000..235a5bf
--- /dev/null
+++ b/Package.swift
@@ -0,0 +1,35 @@
+// swift-tools-version: 5.6
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "MGScopeBar",
+    defaultLocalization: "en",
+    platforms: [
+        .macOS(.v11)
+    ],
+    products: [
+        // Products define the executables and libraries a package produces, and make them visible to other packages.
+        .library(
+            name: "MGScopeBar",
+            targets: ["MGScopeBar"]),
+    ],
+    dependencies: [
+        // Dependencies declare other packages that this package depends on.
+        // .package(url: /* package url */, from: "1.0.0"),
+    ],
+    targets: [
+        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
+        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        .target(
+            name: "MGScopeBar",
+            dependencies: [],
+            resources: [
+                .process("Resources")
+            ]),
+        .testTarget(
+            name: "MGScopeBarTests",
+            dependencies: ["MGScopeBar"]),
+    ]
+)
diff --git a/ReadMe.txt b/README.md
similarity index 100%
rename from ReadMe.txt
rename to README.md
diff --git a/MGRecessedPopUpButtonCell.h b/Sources/MGScopeBar/MGRecessedPopUpButtonCell.h
similarity index 100%
rename from MGRecessedPopUpButtonCell.h
rename to Sources/MGScopeBar/MGRecessedPopUpButtonCell.h
diff --git a/MGRecessedPopUpButtonCell.m b/Sources/MGScopeBar/MGRecessedPopUpButtonCell.m
similarity index 94%
rename from MGRecessedPopUpButtonCell.m
rename to Sources/MGScopeBar/MGRecessedPopUpButtonCell.m
index d41bb92..99b3373 100644
--- a/MGRecessedPopUpButtonCell.m
+++ b/Sources/MGScopeBar/MGRecessedPopUpButtonCell.m
@@ -26,14 +26,6 @@ - (id)initTextCell:(NSString *)title pullsDown:(BOOL)pullsDown
 	return self;
 }
 
-
-- (void)dealloc
-{
-	[recessedButton release];
-	[super dealloc];
-}
-
-
 - (void)drawTitleWithFrame:(NSRect)cellFrame inView:(NSView *)controlView
 {
 	// Inset title rect since its position is broken when NSPopUpButton
diff --git a/MGScopeBar.h b/Sources/MGScopeBar/MGScopeBar.h
similarity index 97%
rename from MGScopeBar.h
rename to Sources/MGScopeBar/MGScopeBar.h
index 9505748..60c3cc3 100644
--- a/MGScopeBar.h
+++ b/Sources/MGScopeBar/MGScopeBar.h
@@ -10,7 +10,7 @@
 #import "MGScopeBarDelegateProtocol.h"
 
 @interface MGScopeBar : NSView {
-	IBOutlet id <MGScopeBarDelegate, NSObject> delegate; // weak ref.
+	IBOutlet __unsafe_unretained id <MGScopeBarDelegate, NSObject> delegate; // weak ref.
 	NSMutableArray *_separatorPositions; // x-coords of separators, indexed by their group-number.
 	NSMutableArray *_groups; // groups of items.
 	NSView *_accessoryView; // weak ref since it's a subview.
diff --git a/MGScopeBar.m b/Sources/MGScopeBar/MGScopeBar.m
similarity index 97%
rename from MGScopeBar.m
rename to Sources/MGScopeBar/MGScopeBar.m
index 60272de..0c39162 100644
--- a/MGScopeBar.m
+++ b/Sources/MGScopeBar/MGScopeBar.m
@@ -99,12 +99,6 @@ - (void)dealloc
 		[_accessoryView removeFromSuperview];
 		_accessoryView = nil; // weak ref
 	}
-	[_separatorPositions release];
-	[_groups release];
-	[_identifiers release];
-	[_selectedItems release];
-	
-	[super dealloc];
 }
 
 
@@ -124,15 +118,10 @@ - (void)reloadData
 	
 	NSArray *subviews = [[self subviews] copy]; // so we don't mutate the collection we're iterating over.
 	[subviews makeObjectsPerformSelector:@selector(removeFromSuperview)];
-	[subviews release]; // because copies are retained.
 	
-	[_separatorPositions release];
 	_separatorPositions = nil;
-	[_groups release];
 	_groups = nil;
-	[_identifiers release];
 	_identifiers = nil;
-	[_selectedItems release];
 	_selectedItems = nil;
 	_firstCollapsedGroup = NSNotFound;
 	_lastWidth = NSNotFound;
@@ -187,7 +176,6 @@ - (void)reloadData
 					ctrlRect.size = [labelField frame].size;
 					[labelField setFrame:ctrlRect];
 					[self addSubview:labelField];
-					[labelField release];
 					
 					xCoord += ctrlRect.size.width + SCOPE_BAR_ITEM_SPACING;
 					
@@ -712,7 +700,7 @@ - (NSButton *)buttonForItem:(NSString *)identifier inGroup:(NSInteger)groupNumbe
 	
 	[self setControl:button forIdentifier:identifier inGroup:groupNumber];
 	
-	return [button autorelease];
+	return button;
 }
 
 
@@ -727,7 +715,7 @@ - (NSMenuItem *)menuItemForItem:(NSString *)identifier inGroup:(NSInteger)groupN
 	
 	[self setControl:menuItem forIdentifier:identifier inGroup:groupNumber];
 	
-	return [menuItem autorelease];
+    return menuItem;
 }
 
 
@@ -742,12 +730,10 @@ - (NSPopUpButton *)popupButtonForGroup:(NSDictionary *)group
 	if (multiSelect) {
 		MGRecessedPopUpButtonCell *cell = [[MGRecessedPopUpButtonCell alloc] initTextCell:@"" pullsDown:NO];
 		[popup setCell:cell];
-		[cell release];
 		
 		[[popup cell] setUsesItemFromMenu:NO];
 		NSMenuItem *titleItem = [[NSMenuItem alloc] init];
 		[[popup cell] setMenuItem:titleItem];
-		[titleItem release];
 	}
 	
 	// Configure appearance and behaviour.
@@ -782,7 +768,7 @@ - (NSPopUpButton *)popupButtonForGroup:(NSDictionary *)group
 	popFrame.origin.y = ceil(([self frame].size.height - popFrame.size.height) / 2.0);
 	[popup setFrame:popFrame];
 	
-	return [popup autorelease];
+	return popup;
 }
 
 
@@ -794,7 +780,7 @@ - (void)setControl:(NSObject *)control forIdentifier:(NSString *)identifier inGr
 	
 	NSMutableArray *identArray = [_identifiers objectForKey:identifier];
 	if (!identArray) {
-		identArray = [[[NSMutableArray alloc] initWithCapacity:groupNumber + 1] autorelease];
+		identArray = [[NSMutableArray alloc] initWithCapacity:groupNumber + 1];
 		[_identifiers setObject:identArray forKey:identifier];
 	}
 	
@@ -872,8 +858,8 @@ - (void)updateMenuTitleForGroupAtIndex:(NSInteger)groupNumber
 - (void)drawRect:(NSRect)rect
 {
     // Draw gradient background.
-	NSGradient *gradient = [[[NSGradient alloc] initWithStartingColor:SCOPE_BAR_START_COLOR_GRAY 
-														  endingColor:SCOPE_BAR_END_COLOR_GRAY] autorelease];
+	NSGradient *gradient = [[NSGradient alloc] initWithStartingColor:SCOPE_BAR_START_COLOR_GRAY
+														  endingColor:SCOPE_BAR_END_COLOR_GRAY];
 	[gradient drawInRect:[self bounds] angle:90.0];
 	
 	// Draw border.
@@ -932,7 +918,6 @@ - (void)setSelected:(BOOL)selected forItem:(NSString *)identifier inGroup:(NSInt
 		BOOL informDelegate = YES;
 		
 		if (group) {
-			[group retain];
 			NSDisableScreenUpdates();
 			
 			// We found the group which this item belongs to. Obtain selection-mode and identifiers.
@@ -956,7 +941,6 @@ - (void)setSelected:(BOOL)selected forItem:(NSString *)identifier inGroup:(NSInt
 						informDelegate = NO;
 					}
 				}
-				[groupSelections release];	
 			}
 			
 			// Change selected state of this item.
@@ -967,7 +951,6 @@ - (void)setSelected:(BOOL)selected forItem:(NSString *)identifier inGroup:(NSInt
 				[self updateMenuTitleForGroupAtIndex:groupNumber];
 			}
 			
-			[group release];
 			NSEnableScreenUpdates();
 		}
 	}
@@ -1012,7 +995,7 @@ - (void)updateSelectedState:(BOOL)selected forItem:(NSString *)identifier inGrou
 
 - (NSArray *)selectedItems
 {
-	return [[_selectedItems copy] autorelease];
+	return [_selectedItems copy];
 }
 - (BOOL) isItemSelectedWithIdentifier:(NSString*)identifier inGroup:(NSInteger)groupNumber;
 {
diff --git a/Base.lproj/MainMenu.xib b/Sources/MGScopeBar/Resources/Base.lproj/MainMenu.xib
similarity index 100%
rename from Base.lproj/MainMenu.xib
rename to Sources/MGScopeBar/Resources/Base.lproj/MainMenu.xib
diff --git a/en.lproj/InfoPlist.strings b/Sources/MGScopeBar/Resources/en.lproj/InfoPlist.strings
similarity index 100%
rename from en.lproj/InfoPlist.strings
rename to Sources/MGScopeBar/Resources/en.lproj/InfoPlist.strings
diff --git a/Sources/MGScopeBar/include/MGScopeBar.h b/Sources/MGScopeBar/include/MGScopeBar.h
new file mode 100644
index 0000000..c958767
--- /dev/null
+++ b/Sources/MGScopeBar/include/MGScopeBar.h
@@ -0,0 +1,14 @@
+//
+//  Header.h
+//  
+//
+//  Created by Christian Beer on 29.08.22.
+//
+
+#ifndef Header_h
+#define Header_h
+
+#include "../MGScopeBar.h"
+#include "../MGRecessedPopUpButtonCell.h"
+
+#endif /* Header_h */
diff --git a/MGScopeBarDelegateProtocol.h b/Sources/MGScopeBar/include/MGScopeBarDelegateProtocol.h
similarity index 100%
rename from MGScopeBarDelegateProtocol.h
rename to Sources/MGScopeBar/include/MGScopeBarDelegateProtocol.h
diff --git a/Tests/MGScopeBarTests/MGScopeBarTests.swift b/Tests/MGScopeBarTests/MGScopeBarTests.swift
new file mode 100644
index 0000000..11347b4
--- /dev/null
+++ b/Tests/MGScopeBarTests/MGScopeBarTests.swift
@@ -0,0 +1,10 @@
+import XCTest
+@testable import MGScopeBar
+
+final class MGScopeBarTests: XCTestCase {
+    func testExample() throws {
+        // This is an example of a functional test case.
+        // Use XCTAssert and related functions to verify your tests produce the correct
+        // results.
+    }
+}