diff --git a/osu.Game.Tests/Visual/SongSelect/TestSceneUpdateBeatmapSetButton.cs b/osu.Game.Tests/Visual/SongSelect/TestSceneUpdateBeatmapSetButton.cs
index 70786c93e7..f76f050546 100644
--- a/osu.Game.Tests/Visual/SongSelect/TestSceneUpdateBeatmapSetButton.cs
+++ b/osu.Game.Tests/Visual/SongSelect/TestSceneUpdateBeatmapSetButton.cs
@@ -10,10 +10,13 @@ using osu.Framework.Graphics;
 using osu.Framework.Testing;
 using osu.Game.Beatmaps;
 using osu.Game.Online.API;
+using osu.Game.Overlays;
+using osu.Game.Overlays.Dialog;
 using osu.Game.Screens.Select;
 using osu.Game.Screens.Select.Carousel;
 using osu.Game.Tests.Online;
 using osu.Game.Tests.Resources;
+using osuTK.Input;
 
 namespace osu.Game.Tests.Visual.SongSelect
 {
@@ -41,17 +44,7 @@ namespace osu.Game.Tests.Visual.SongSelect
         [SetUpSteps]
         public void SetUpSteps()
         {
-            AddStep("create carousel", () =>
-            {
-                Child = carousel = new BeatmapCarousel
-                {
-                    RelativeSizeAxes = Axes.Both,
-                    BeatmapSets = new List<BeatmapSetInfo>
-                    {
-                        (testBeatmapSetInfo = TestResources.CreateTestBeatmapSetInfo()),
-                    }
-                };
-            });
+            AddStep("create carousel", () => Child = createCarousel());
 
             AddUntilStep("wait for load", () => carousel.BeatmapSetsLoaded);
 
@@ -152,5 +145,60 @@ namespace osu.Game.Tests.Visual.SongSelect
 
             AddUntilStep("wait for button enabled", () => getUpdateButton()?.Enabled.Value == true);
         }
+
+        [Test]
+        public void TestUpdateLocalBeatmap()
+        {
+            DialogOverlay dialogOverlay = null!;
+
+            AddStep("create carousel with dialog overlay", () =>
+            {
+                dialogOverlay = new DialogOverlay();
+
+                Child = new DependencyProvidingContainer
+                {
+                    RelativeSizeAxes = Axes.Both,
+                    CachedDependencies = new (Type, object)[] { (typeof(IDialogOverlay), dialogOverlay), },
+                    Children = new Drawable[]
+                    {
+                        createCarousel(),
+                        dialogOverlay,
+                    },
+                };
+            });
+
+            AddStep("setup beatmap state", () =>
+            {
+                testBeatmapSetInfo.Beatmaps.First().OnlineMD5Hash = "different hash";
+                testBeatmapSetInfo.Beatmaps.First().LastOnlineUpdate = DateTimeOffset.Now;
+                testBeatmapSetInfo.Status = BeatmapOnlineStatus.LocallyModified;
+
+                carousel.UpdateBeatmapSet(testBeatmapSetInfo);
+            });
+
+            AddStep("click button", () => getUpdateButton()?.TriggerClick());
+
+            AddAssert("dialog displayed", () => dialogOverlay.CurrentDialog is UpdateLocalConfirmationDialog);
+            AddStep("click confirmation", () =>
+            {
+                InputManager.MoveMouseTo(dialogOverlay.CurrentDialog.ChildrenOfType<PopupDialogButton>().First());
+                InputManager.PressButton(MouseButton.Left);
+            });
+
+            AddUntilStep("update started", () => beatmapDownloader.GetExistingDownload(testBeatmapSetInfo) != null);
+            AddStep("release mouse button", () => InputManager.ReleaseButton(MouseButton.Left));
+        }
+
+        private BeatmapCarousel createCarousel()
+        {
+            return carousel = new BeatmapCarousel
+            {
+                RelativeSizeAxes = Axes.Both,
+                BeatmapSets = new List<BeatmapSetInfo>
+                {
+                    (testBeatmapSetInfo = TestResources.CreateTestBeatmapSetInfo()),
+                }
+            };
+        }
     }
 }
diff --git a/osu.Game/Localisation/PopupDialogStrings.cs b/osu.Game/Localisation/PopupDialogStrings.cs
new file mode 100644
index 0000000000..b2e9673cbe
--- /dev/null
+++ b/osu.Game/Localisation/PopupDialogStrings.cs
@@ -0,0 +1,24 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Framework.Localisation;
+
+namespace osu.Game.Localisation
+{
+    public static class PopupDialogStrings
+    {
+        private const string prefix = @"osu.Game.Resources.Localisation.PopupDialog";
+
+        /// <summary>
+        /// "Are you sure you want to update this beatmap?"
+        /// </summary>
+        public static LocalisableString UpdateLocallyModifiedText => new TranslatableString(getKey(@"update_locally_modified_text"), @"Are you sure you want to update this beatmap?");
+
+        /// <summary>
+        /// "This will discard all local changes you have on that beatmap."
+        /// </summary>
+        public static LocalisableString UpdateLocallyModifiedDescription => new TranslatableString(getKey(@"update_locally_modified_description"), @"This will discard all local changes you have on that beatmap.");
+
+        private static string getKey(string key) => $@"{prefix}:{key}";
+    }
+}
diff --git a/osu.Game/Screens/Select/Carousel/UpdateBeatmapSetButton.cs b/osu.Game/Screens/Select/Carousel/UpdateBeatmapSetButton.cs
index 023d3627b0..1bb607bcf3 100644
--- a/osu.Game/Screens/Select/Carousel/UpdateBeatmapSetButton.cs
+++ b/osu.Game/Screens/Select/Carousel/UpdateBeatmapSetButton.cs
@@ -32,9 +32,12 @@ namespace osu.Game.Screens.Select.Carousel
         [Resolved]
         private IAPIProvider api { get; set; } = null!;
 
-        [Resolved(canBeNull: true)]
+        [Resolved]
         private LoginOverlay? loginOverlay { get; set; }
 
+        [Resolved]
+        private IDialogOverlay? dialogOverlay { get; set; }
+
         public UpdateBeatmapSetButton(BeatmapSetInfo beatmapSetInfo)
         {
             this.beatmapSetInfo = beatmapSetInfo;
@@ -102,17 +105,34 @@ namespace osu.Game.Screens.Select.Carousel
                 },
             });
 
-            Action = () =>
-            {
-                if (!api.IsLoggedIn)
-                {
-                    loginOverlay?.Show();
-                    return;
-                }
+            Action = updateBeatmap;
+        }
 
-                beatmapDownloader.DownloadAsUpdate(beatmapSetInfo, preferNoVideo.Value);
-                attachExistingDownload();
-            };
+        private bool updateConfirmed;
+
+        private void updateBeatmap()
+        {
+            if (!api.IsLoggedIn)
+            {
+                loginOverlay?.Show();
+                return;
+            }
+
+            if (dialogOverlay != null && beatmapSetInfo.Status == BeatmapOnlineStatus.LocallyModified && !updateConfirmed)
+            {
+                dialogOverlay.Push(new UpdateLocalConfirmationDialog(() =>
+                {
+                    updateConfirmed = true;
+                    updateBeatmap();
+                }));
+
+                return;
+            }
+
+            updateConfirmed = false;
+
+            beatmapDownloader.DownloadAsUpdate(beatmapSetInfo, preferNoVideo.Value);
+            attachExistingDownload();
         }
 
         protected override void LoadComplete()
diff --git a/osu.Game/Screens/Select/Carousel/UpdateLocalConfirmationDialog.cs b/osu.Game/Screens/Select/Carousel/UpdateLocalConfirmationDialog.cs
new file mode 100644
index 0000000000..f5267e905e
--- /dev/null
+++ b/osu.Game/Screens/Select/Carousel/UpdateLocalConfirmationDialog.cs
@@ -0,0 +1,21 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+using osu.Framework.Graphics.Sprites;
+using osu.Game.Overlays.Dialog;
+using osu.Game.Localisation;
+
+namespace osu.Game.Screens.Select.Carousel
+{
+    public class UpdateLocalConfirmationDialog : DeleteConfirmationDialog
+    {
+        public UpdateLocalConfirmationDialog(Action onConfirm)
+        {
+            HeaderText = PopupDialogStrings.UpdateLocallyModifiedText;
+            BodyText = PopupDialogStrings.UpdateLocallyModifiedDescription;
+            Icon = FontAwesome.Solid.ExclamationTriangle;
+            DeleteAction = onConfirm;
+        }
+    }
+}