diff --git a/README.md b/README.md
index afd7b6c..9d5bbee 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,7 @@ A minimal macOS menu bar timer with task tracking.
 
 ## Requirements
 
-- macOS 15.0 (Sequoia) or later
+- macOS 13.0 (Ventura) or later
 - Xcode 16+ (for building from source)
 
 ## Installation
diff --git a/musubi.xcodeproj/project.pbxproj b/musubi.xcodeproj/project.pbxproj
index d13b223..cc1012e 100644
--- a/musubi.xcodeproj/project.pbxproj
+++ b/musubi.xcodeproj/project.pbxproj
@@ -177,7 +177,7 @@
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
 				LOCALIZATION_PREFERS_STRING_CATALOGS = YES;
-				MACOSX_DEPLOYMENT_TARGET = 15.6;
+				MACOSX_DEPLOYMENT_TARGET = 13.0;
 				MTL_ENABLE_DEBUG_INFO = INCLUDE_SOURCE;
 				MTL_FAST_MATH = YES;
 				ONLY_ACTIVE_ARCH = YES;
@@ -234,7 +234,7 @@
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
 				LOCALIZATION_PREFERS_STRING_CATALOGS = YES;
-				MACOSX_DEPLOYMENT_TARGET = 15.6;
+				MACOSX_DEPLOYMENT_TARGET = 13.0;
 				MTL_ENABLE_DEBUG_INFO = NO;
 				MTL_FAST_MATH = YES;
 				SDKROOT = macosx;
diff --git a/musubi/Assets.xcassets/AppIcon.appiconset/Contents.json b/musubi/Assets.xcassets/AppIcon.appiconset/Contents.json
index 3f00db4..7d9d04a 100644
--- a/musubi/Assets.xcassets/AppIcon.appiconset/Contents.json
+++ b/musubi/Assets.xcassets/AppIcon.appiconset/Contents.json
@@ -46,6 +46,7 @@
       "size" : "512x512"
     },
     {
+      "filename" : "icon-1765872958423.png",
       "idiom" : "mac",
       "scale" : "2x",
       "size" : "512x512"
diff --git a/musubi/Assets.xcassets/AppIcon.appiconset/icon-1765872958423.png b/musubi/Assets.xcassets/AppIcon.appiconset/icon-1765872958423.png
new file mode 100644
index 0000000..f692145
Binary files /dev/null and b/musubi/Assets.xcassets/AppIcon.appiconset/icon-1765872958423.png differ
diff --git a/musubi/Assets.xcassets/MusubiAppIcon-iOS-Default-1024x1024@1x.png b/musubi/Assets.xcassets/MusubiAppIcon-iOS-Default-1024x1024@1x.png
new file mode 100644
index 0000000..f56a5a0
Binary files /dev/null and b/musubi/Assets.xcassets/MusubiAppIcon-iOS-Default-1024x1024@1x.png differ
diff --git a/musubi/UIHelpers/RulerSlider.swift b/musubi/UIHelpers/RulerSlider.swift
index 3f7a18e..2c1f9c0 100644
--- a/musubi/UIHelpers/RulerSlider.swift
+++ b/musubi/UIHelpers/RulerSlider.swift
@@ -23,6 +23,15 @@ struct RulerSlider: View {
     @State private var scrolledID: Int?
 
     var body: some View {
+        if #available(macOS 14.0, *) {
+            modernRulerSlider
+        } else {
+            legacyRulerSlider
+        }
+    }
+
+    @available(macOS 14.0, *)
+    private var modernRulerSlider: some View {
         GeometryReader { geometry in
             let halfWidth = geometry.size.width / 2
 
@@ -61,8 +70,49 @@ struct RulerSlider: View {
         }
         .frame(height: totalHeight)
     }
+
+    private var legacyRulerSlider: some View {
+        GeometryReader { geometry in
+            let halfWidth = geometry.size.width / 2
+
+            ScrollViewReader { proxy in
+                ScrollView(.horizontal, showsIndicators: false) {
+                    HStack(spacing: tickSpacing) {
+                        ForEach(range, id: \.self) { minute in
+                            TickMark(
+                                minute: minute,
+                                isMajor: minute % 10 == 0,
+                                isSelected: minute == value,
+                                accentColor: accentColor,
+                                minorHeight: minorTickHeight,
+                                majorHeight: majorTickHeight
+                            )
+                            .id(minute)
+                            .onTapGesture {
+                                value = minute
+                                withAnimation {
+                                    proxy.scrollTo(minute, anchor: .center)
+                                }
+                            }
+                        }
+                    }
+                    .padding(.horizontal, halfWidth)
+                }
+                .onAppear {
+                    proxy.scrollTo(value, anchor: .center)
+                }
+                .onChange(of: value) { newValue in
+                    withAnimation {
+                        proxy.scrollTo(newValue, anchor: .center)
+                    }
+                }
+            }
+        }
+        .frame(height: totalHeight)
+    }
 }
 
+@available(macOS 14.0, *)
 private struct NearestTickBehavior: ScrollTargetBehavior {
     let tickStep: CGFloat
     let tickCount: Int
@@ -106,6 +156,7 @@ private struct TickMark: View {
     }
 }
 
+@available(macOS 14.0, *)
 #Preview {
     @Previewable @State var minutes = 25
     VStack {
diff --git a/musubi/View/ContentView.swift b/musubi/View/ContentView.swift
index 12ed628..5e362db 100644
--- a/musubi/View/ContentView.swift
+++ b/musubi/View/ContentView.swift
@@ -18,7 +18,7 @@ struct ContentView: View {
     var body: some View {
         VStack(alignment: .leading) {
             RulerSlider(value: $sliderMinutes, range: 0...120, accentColor: settings.accentColor)
-                .onChange(of: sliderMinutes) { oldValue, newValue in
+                .onChange(of: sliderMinutes) { newValue in
                     vm.setDuration(minutes: newValue)
                 }
 
diff --git a/musubi/View/SettingsView.swift b/musubi/View/SettingsView.swift
index ba20dbd..bb5f18b 100644
--- a/musubi/View/SettingsView.swift
+++ b/musubi/View/SettingsView.swift
@@ -54,7 +54,7 @@ struct SettingsView: View {
                         .foregroundColor(.secondary)
                     Slider(value: $settings.alarmVolume, in: 0...1)
                         .tint(.gray.opacity(0.5))
-                        .onChange(of: settings.alarmVolume) { _, newValue in
+                        .onChange(of: settings.alarmVolume) { newValue in
                             playPreviewSound(volume: newValue)
                         }
                     Image(systemName: "speaker.wave.3.fill")