diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 11a2c1a..0655467 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -23,7 +23,7 @@ jobs:
       - name: Install Dependencies
         run: |
           apt update
-          apt install -y libgranite-dev systemd-dev meson valac
+          apt install -y libgranite-7-dev systemd-dev meson valac
       - name: Build
         env:
           DESTDIR: out
diff --git a/README.md b/README.md
index 51c9a31..37fdb4c 100644
--- a/README.md
+++ b/README.md
@@ -7,8 +7,8 @@ Send and receive files via Bluetooth
 
 You'll need the following dependencies:
 
-    libgranite-dev >= 6.0.0
-    libgtk3-dev
+    libgranite-7-dev >= 7.7.0
+    libgtk-4-dev
     systemd-dev
     meson
     valac
diff --git a/meson.build b/meson.build
index 4cf94a8..9f8785f 100644
--- a/meson.build
+++ b/meson.build
@@ -13,8 +13,8 @@ i18n = import('i18n')
 prefix = get_option('prefix')
 bindir = prefix / get_option('bindir')
 
-granite_dep = dependency ('granite')
-gtk_dep = dependency ('gtk+-3.0')
+granite_dep = dependency ('granite-7', version: '>=7.7.0')
+gtk_dep = dependency ('gtk4')
 posix_dep = meson.get_compiler('vala').find_library('posix')
 
 subdir('data')
diff --git a/src/Application.vala b/src/Application.vala
index 577984d..fd3919e 100644
--- a/src/Application.vala
+++ b/src/Application.vala
@@ -48,8 +48,9 @@ public class BluetoothApp : Gtk.Application {
 
             if (bt_scan == null) {
                 bt_scan = new ScanDialog (this, object_manager);
-                bt_scan.destroy.connect (() => {
+                bt_scan.close_request.connect (() => {
                     bt_scan = null;
+                    return Gdk.EVENT_PROPAGATE;
                 });
 
                 bt_scan.send_file.connect ((device) => {
@@ -58,12 +59,13 @@ public class BluetoothApp : Gtk.Application {
                         bt_sender.add_files (files, device);
                         bt_senders.append (bt_sender);
                         bt_sender.present ();
-                        bt_sender.destroy.connect (() => {
+                        bt_sender.close_request.connect (() => {
                             bt_senders.foreach ((sender) => {
                                 if (sender.device == bt_sender.device) {
                                     bt_senders.remove_link (bt_senders.find (sender));
                                 }
                             });
+                            return Gdk.EVENT_PROPAGATE;
                         });
                     }
                 });
@@ -234,7 +236,7 @@ public class BluetoothApp : Gtk.Application {
 
         bt_receiver = new ReceiverDialog (this);
         bt_receivers.append (bt_receiver);
-        bt_receiver.destroy.connect (() => {
+        ((Gtk.Widget) bt_receiver).destroy.connect (() => {
             bt_receivers.foreach ((receiver) => {
                 if (receiver.transfer.session == bt_receiver.session) {
                     bt_receivers.remove_link (bt_receivers.find (receiver));
diff --git a/src/Dialog/DeviceRow.vala b/src/Dialog/DeviceRow.vala
index 7d6d71d..792b088 100644
--- a/src/Dialog/DeviceRow.vala
+++ b/src/Dialog/DeviceRow.vala
@@ -28,9 +28,11 @@ public class DeviceRow : Gtk.ListBoxRow {
     }
 
     construct {
-        var image = new Gtk.Image.from_icon_name (device.icon ?? "bluetooth", DND);
+        var image = new Gtk.Image.from_icon_name (device.icon ?? "bluetooth") {
+            icon_size = LARGE
+        };
 
-        state = new Gtk.Image.from_icon_name ("emblem-disabled", MENU) {
+        state = new Gtk.Image.from_icon_name ("emblem-disabled") {
             halign = END,
             valign = END
         };
@@ -38,7 +40,7 @@ public class DeviceRow : Gtk.ListBoxRow {
         var state_label = new Gtk.Label (null) {
             xalign = 0
         };
-        state_label.get_style_context ().add_class (Granite.STYLE_CLASS_SMALL_LABEL);
+        state_label.add_css_class (Granite.CssClass.SMALL);
 
         var overlay = new Gtk.Overlay () {
             child = image,
@@ -81,7 +83,6 @@ public class DeviceRow : Gtk.ListBoxRow {
         grid.attach (send_button, 4, 0, 1, 2);
 
         child = grid;
-        show_all ();
 
         set_sensitive (adapter.powered);
         set_status (device.connected);
@@ -114,7 +115,7 @@ public class DeviceRow : Gtk.ListBoxRow {
 
         send_button.clicked.connect (() => {
             send_file (device);
-            get_toplevel ().destroy ();
+            get_root ().destroy ();
         });
     }
 
diff --git a/src/Dialog/ReceiverDialog.vala b/src/Dialog/ReceiverDialog.vala
index ae44e40..960dbf6 100644
--- a/src/Dialog/ReceiverDialog.vala
+++ b/src/Dialog/ReceiverDialog.vala
@@ -32,7 +32,8 @@ public class ReceiverDialog : Granite.Dialog {
         notification = new GLib.Notification ("bluetooth");
         notification.set_priority (NotificationPriority.NORMAL);
 
-        var icon_image = new Gtk.Image.from_icon_name ("io.elementary.bluetooth", Gtk.IconSize.DIALOG) {
+        var icon_image = new Gtk.Image.from_icon_name ("io.elementary.bluetooth") {
+            pixel_size = 48,
             valign = END,
             halign = END
         };
@@ -54,7 +55,7 @@ public class ReceiverDialog : Granite.Dialog {
             wrap = true,
             xalign = 0
         };
-        device_label.get_style_context ().add_class ("primary");
+        device_label.add_css_class ("primary");
 
         directory_label = new Gtk.Label (null) {
             max_width_chars = 45,
@@ -101,14 +102,13 @@ public class ReceiverDialog : Granite.Dialog {
         message_grid.attach (rate_label, 1, 3);
         message_grid.attach (progressbar, 1, 4);
         message_grid.attach (progress_label, 1, 5);
-        message_grid.show_all ();
 
-        get_content_area ().add (message_grid);
+        get_content_area ().append (message_grid);
 
         add_button (_("Close"), Gtk.ResponseType.CLOSE);
 
         var suggested_button = add_button (_("Reject"), Gtk.ResponseType.ACCEPT);
-        suggested_button.get_style_context ().add_class (Gtk.STYLE_CLASS_DESTRUCTIVE_ACTION);
+        suggested_button.add_css_class (Granite.CssClass.DESTRUCTIVE);
 
         response.connect ((response_id) => {
             if (response_id == Gtk.ResponseType.ACCEPT) {
@@ -117,18 +117,9 @@ public class ReceiverDialog : Granite.Dialog {
                 } catch (Error e) {
                     GLib.warning (e.message);
                 }
-                destroy ();
-            } else {
-                hide_on_delete ();
             }
-        });
 
-        delete_event.connect (() => {
-            if (transfer.status == "active") {
-                return hide_on_delete ();
-            } else {
-                return false;
-            }
+            close ();
         });
     }
 
@@ -152,6 +143,8 @@ public class ReceiverDialog : Granite.Dialog {
     }
 
     private void tranfer_progress () {
+        hide_on_close = transfer.status == "active";
+
         try {
             switch (transfer.status) {
                 case "error":
@@ -159,7 +152,7 @@ public class ReceiverDialog : Granite.Dialog {
                     notification.set_title (_("File transfer failed"));
                     notification.set_body (GLib.Markup.printf_escaped (_("%s <b>File:</b> %s not received"), device_label.get_label (), transfer.name));
                     Application.get_default ().send_notification ("io.elementary.bluetooth", notification);
-                    destroy ();
+                    close ();
                     break;
                 case "queued":
                     break;
@@ -172,7 +165,7 @@ public class ReceiverDialog : Granite.Dialog {
                     break;
                 case "complete":
                     move_to_folder (path_folder);
-                    destroy ();
+                    close ();
                     break;
             }
         } catch (Error e) {
diff --git a/src/Dialog/ScanDialog.vala b/src/Dialog/ScanDialog.vala
index 98c9ccb..a16044e 100644
--- a/src/Dialog/ScanDialog.vala
+++ b/src/Dialog/ScanDialog.vala
@@ -23,7 +23,8 @@ public class ScanDialog : Granite.Dialog {
     }
 
     construct {
-        var icon_image = new Gtk.Image.from_icon_name ("io.elementary.bluetooth", Gtk.IconSize.DIALOG) {
+        var icon_image = new Gtk.Image.from_icon_name ("io.elementary.bluetooth") {
+            pixel_size = 48,
             valign = CENTER,
             halign = CENTER
         };
@@ -34,7 +35,7 @@ public class ScanDialog : Granite.Dialog {
             wrap = true,
             xalign = 0
         };
-        title_label.get_style_context ().add_class ("primary");
+        title_label.add_css_class ("primary");
 
         var info_label = new Gtk.Label (_("Select a Bluetooth Device Below to Send Files")) {
             max_width_chars = 45,
@@ -43,12 +44,9 @@ public class ScanDialog : Granite.Dialog {
             xalign = 0
         };
 
-        var empty_alert = new Granite.Widgets.AlertView (
-            _("No Devices Found"),
-            _("Please ensure that your devices are visible and ready for pairing."),
-            ""
-        );
-        empty_alert.show_all ();
+        var empty_alert = new Granite.Placeholder (_("No Devices Found")) {
+            description = _("Please ensure that your devices are visible and ready for pairing.")
+        };
 
         list_box = new Gtk.ListBox () {
             activate_on_single_click = true,
@@ -57,8 +55,9 @@ public class ScanDialog : Granite.Dialog {
         list_box.set_sort_func ((Gtk.ListBoxSortFunc) compare_rows);
         list_box.set_placeholder (empty_alert);
 
-        var scrolled = new Gtk.ScrolledWindow (null, null) {
+        var scrolled = new Gtk.ScrolledWindow () {
             child = list_box,
+            has_frame = true,
             hexpand = true,
             vexpand = true,
             hscrollbar_policy = NEVER,
@@ -67,13 +66,12 @@ public class ScanDialog : Granite.Dialog {
             max_content_height = 350,
             propagate_natural_height = true
         };
-        scrolled.get_style_context ().add_class (Gtk.STYLE_CLASS_FRAME);
 
         var overlay = new Gtk.Overlay () {
             child = scrolled
         };
 
-        var overlaybar = new Granite.Widgets.OverlayBar (overlay) {
+        var overlaybar = new Granite.OverlayBar (overlay) {
             label = _("Discovering")
         };
 
@@ -87,10 +85,10 @@ public class ScanDialog : Granite.Dialog {
         var content_box = new Gtk.Box (VERTICAL, 0) {
             valign = CENTER
         };
-        content_box.add (image_grid);
-        content_box.add (overlay);
+        content_box.append (image_grid);
+        content_box.append (overlay);
 
-        get_content_area ().add (content_box);
+        get_content_area ().append (content_box);
 
         manager.device_added.connect (add_device);
         manager.device_removed.connect (device_removed);
@@ -102,7 +100,7 @@ public class ScanDialog : Granite.Dialog {
 
         response.connect ((response_id) => {
             manager.stop_discovery.begin ();
-            destroy ();
+            close ();
         });
     }
 
@@ -124,7 +122,7 @@ public class ScanDialog : Granite.Dialog {
         }
 
         var row = new DeviceRow (device, manager.get_adapter_from_path (device.adapter));
-        list_box.add (row);
+        list_box.append (row);
 
         if (list_box.get_selected_row () == null) {
             list_box.select_row (row);
diff --git a/src/Dialog/SenderDialog.vala b/src/Dialog/SenderDialog.vala
index 81270ef..2ebbd33 100644
--- a/src/Dialog/SenderDialog.vala
+++ b/src/Dialog/SenderDialog.vala
@@ -37,7 +37,8 @@ public class SenderDialog : Granite.Dialog {
     construct {
         liststore = new Gtk.ListStore (1, typeof (File));
 
-        var icon_image = new Gtk.Image.from_icon_name ("io.elementary.bluetooth", Gtk.IconSize.DIALOG) {
+        var icon_image = new Gtk.Image.from_icon_name ("io.elementary.bluetooth") {
+            pixel_size = 48,
             valign = END,
             halign = END
         };
@@ -59,7 +60,7 @@ public class SenderDialog : Granite.Dialog {
             wrap = true,
             xalign = 0
         };
-        path_label.get_style_context ().add_class ("primary");
+        path_label.add_css_class ("primary");
 
         device_label = new Gtk.Label (GLib.Markup.printf_escaped ("<b>%s</b>:", _("To"))) {
             max_width_chars = 45,
@@ -106,43 +107,27 @@ public class SenderDialog : Granite.Dialog {
         message_grid.attach (rate_label, 1, 3);
         message_grid.attach (progressbar, 1, 4);
         message_grid.attach (progress_label, 1, 5);
-        message_grid.show_all ();
 
-        get_content_area ().add (message_grid);
+        get_content_area ().append (message_grid);
 
         add_button (_("Close"), Gtk.ResponseType.CLOSE);
 
         var reject_transfer = add_button (_("Cancel"), Gtk.ResponseType.CANCEL);
-        reject_transfer.get_style_context ().add_class (Gtk.STYLE_CLASS_DESTRUCTIVE_ACTION);
+        reject_transfer.add_css_class (Granite.CssClass.DESTRUCTIVE);
 
         response.connect ((response_id) => {
             if (response_id == Gtk.ResponseType.CANCEL) {
-                if (transfer != null) {
-                    if (transfer.status == "active") {
-                        try {
-                            transfer.cancel ();
-                        } catch (Error e) {
-                            GLib.warning (e.message);
-                        }
-                        remove_session.begin ();
+                if (transfer != null && transfer.status == "active") {
+                    try {
+                        transfer.cancel ();
+                    } catch (Error e) {
+                        GLib.warning (e.message);
                     }
-                }
-                destroy ();
-            } else {
-                if (transfer.status == "active") {
-                    hide_on_delete ();
-                } else {
-                    destroy ();
+                    remove_session.begin ();
                 }
             }
-        });
 
-        delete_event.connect (() => {
-            if (transfer.status == "active") {
-                return hide_on_delete ();
-            } else {
-                return false;
-            }
+            close ();
         });
     }
 
@@ -241,7 +226,7 @@ public class SenderDialog : Granite.Dialog {
             );
             send_file.begin ();
         } catch (Error e) {
-            hide_on_delete ();
+            hide ();
             var bt_retry = new Granite.MessageDialog (
                 _("Connecting to '%s' failed.").printf (device.alias),
                 "%s\n%s".printf (
@@ -257,14 +242,14 @@ public class SenderDialog : Granite.Dialog {
             };
             bt_retry.add_button (_("Cancel"), Gtk.ResponseType.CANCEL);
             var suggested_button = bt_retry.add_button (_("Retry"), Gtk.ResponseType.ACCEPT);
-            suggested_button.get_style_context ().add_class (Gtk.STYLE_CLASS_SUGGESTED_ACTION);
+            suggested_button.add_css_class (Granite.CssClass.SUGGESTED);
 
             bt_retry.response.connect ((response_id) => {
                 if (response_id == Gtk.ResponseType.ACCEPT) {
                     create_session.begin ();
                     present ();
                 } else {
-                    destroy ();
+                    close ();
                 }
 
                 bt_retry.destroy ();
@@ -306,9 +291,11 @@ public class SenderDialog : Granite.Dialog {
     }
 
     private void tranfer_progress () {
+        hide_on_close = transfer.status == "active";
+
         switch (transfer.status) {
             case "error":
-                hide_on_delete ();
+                hide ();
                 var bt_retry = new Granite.MessageDialog (
                     _("The transfer of '%s' failed.").printf (file_path.get_basename ()),
                     "%s\n%s".printf (
@@ -324,7 +311,7 @@ public class SenderDialog : Granite.Dialog {
                 };
                 bt_retry.add_button (_("Cancel"), Gtk.ResponseType.CANCEL);
                 var suggested_button = bt_retry.add_button (_("Retry"), Gtk.ResponseType.ACCEPT);
-                suggested_button.get_style_context ().add_class (Gtk.STYLE_CLASS_SUGGESTED_ACTION);
+                suggested_button.add_css_class (Granite.CssClass.SUGGESTED);
 
                 bt_retry.response.connect ((response_id) => {
                     if (response_id == Gtk.ResponseType.ACCEPT) {
@@ -350,7 +337,7 @@ public class SenderDialog : Granite.Dialog {
                 send_notify ();
                 if (!next_file ()) {
                     remove_session.begin ();
-                    destroy ();
+                    close ();
                 }
                 break;
         }