diff --git a/src/gui/importer/gcal-import-dialog.c b/src/gui/importer/gcal-import-dialog.c
index a1da8092..05f71d54 100644
--- a/src/gui/importer/gcal-import-dialog.c
+++ b/src/gui/importer/gcal-import-dialog.c
@@ -39,7 +39,7 @@ typedef struct
 
 struct _GcalImportDialog
 {
-  GtkDialog           parent;
+  AdwWindow           parent;
 
   GtkWidget          *cancel_button;
   AdwComboRow        *calendar_combo_row;
@@ -64,7 +64,7 @@ static void          on_import_row_file_loaded_cb                 (GcalImportFil
                                                                    GPtrArray         *events,
                                                                    GcalImportDialog  *self);
 
-G_DEFINE_TYPE (GcalImportDialog, gcal_import_dialog, GTK_TYPE_DIALOG)
+G_DEFINE_TYPE (GcalImportDialog, gcal_import_dialog, ADW_TYPE_WINDOW)
 
 enum
 {
diff --git a/src/gui/importer/gcal-import-dialog.h b/src/gui/importer/gcal-import-dialog.h
index d2304834..2f5e73ec 100644
--- a/src/gui/importer/gcal-import-dialog.h
+++ b/src/gui/importer/gcal-import-dialog.h
@@ -20,12 +20,14 @@
 
 #pragma once
 
+#include <adwaita.h>
+
 #include "gcal-context.h"
 
 G_BEGIN_DECLS
 
 #define GCAL_TYPE_IMPORT_DIALOG (gcal_import_dialog_get_type())
-G_DECLARE_FINAL_TYPE (GcalImportDialog, gcal_import_dialog, GCAL, IMPORT_DIALOG, GtkDialog)
+G_DECLARE_FINAL_TYPE (GcalImportDialog, gcal_import_dialog, GCAL, IMPORT_DIALOG, AdwWindow)
 
 GtkWidget*           gcal_import_dialog_new_for_files            (GcalContext        *context,
                                                                   GFile             **files,
diff --git a/src/gui/importer/gcal-import-dialog.ui b/src/gui/importer/gcal-import-dialog.ui
index c55bc209..3ff5dab6 100644
--- a/src/gui/importer/gcal-import-dialog.ui
+++ b/src/gui/importer/gcal-import-dialog.ui
@@ -1,83 +1,83 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <interface>
-  <template class="GcalImportDialog" parent="GtkDialog">
+  <template class="GcalImportDialog" parent="AdwWindow">
     <property name="title" translatable="yes">Import Files…</property>
-    <property name="width_request">500</property>
-    <property name="default_width">550</property>
-    <property name="default_height">500</property>
-    <property name="resizable">False</property>
+    <property name="width-request">360</property>
+    <property name="height-request">294</property>
+    <property name="default-width">550</property>
+    <property name="default-height">500</property>
     <property name="modal">True</property>
-    <property name="destroy_with_parent">True</property>
-    <property name="use-header-bar">1</property>
+    <property name="destroy-with-parent">True</property>
+    <property name="content">
+      <object class="AdwToolbarView">
+        <child type="top">
+          <object class="GtkHeaderBar" id="headerbar">
+            <property name="show-title-buttons">False</property>
 
-    <child type="titlebar">
-      <object class="GtkHeaderBar" id="headerbar">
-        <property name="show-title-buttons">False</property>
-
-        <!-- Cancel button -->
-        <child type="start">
-          <object class="GtkButton" id="cancel_button">
-            <property name="label" translatable="yes">_Cancel</property>
-            <property name="use-underline">True</property>
-            <signal name="clicked" handler="on_cancel_button_clicked_cb" object="GcalImportDialog" swapped="no" />
-          </object>
-        </child>
-
-        <!-- Import button -->
-        <child type="end">
-          <object class="GtkButton" id="import_button">
-            <property name="label" translatable="yes">_Import</property>
-            <property name="use-underline">True</property>
-            <signal name="clicked" handler="on_import_button_clicked_cb" object="GcalImportDialog" swapped="no" />
-            <style>
-              <class name="suggested-action" />
-            </style>
-          </object>
-        </child>
-
-      </object>
-    </child>
-
-    <child>
-      <object class="AdwPreferencesPage" id="preferences_page">
-
-        <!-- Calendar -->
-        <child>
-          <object class="AdwPreferencesGroup">
-            <child>
-              <object class="AdwComboRow" id="calendar_combo_row">
-                <property name="activatable">True</property>
-                <property name="title" translatable="yes">C_alendar</property>
+            <!-- Cancel button -->
+            <child type="start">
+              <object class="GtkButton" id="cancel_button">
+                <property name="label" translatable="yes">_Cancel</property>
                 <property name="use-underline">True</property>
-                <property name="factory">
-                  <object class="GtkSignalListItemFactory">
-                    <signal name="bind" handler="on_combo_row_signal_factory_bind_cb" object="GcalImportDialog" swapped="no" />
-                    <signal name="setup" handler="on_combo_row_signal_factory_setup_cb" object="GcalImportDialog" swapped="no" />
-                  </object>
-                </property>
-                <signal name="notify::selected-item" handler="on_calendar_combo_row_selected_item_changed_cb" object="GcalImportDialog" swapped="no" />
+                <signal name="clicked" handler="on_cancel_button_clicked_cb" object="GcalImportDialog" swapped="no" />
               </object>
             </child>
+
+            <!-- Import button -->
+            <child type="end">
+              <object class="GtkButton" id="import_button">
+                <property name="label" translatable="yes">_Import</property>
+                <property name="use-underline">True</property>
+                <signal name="clicked" handler="on_import_button_clicked_cb" object="GcalImportDialog" swapped="no" />
+                <style>
+                  <class name="suggested-action" />
+                </style>
+              </object>
+            </child>
+
           </object>
         </child>
+        <property name="content">
+          <object class="AdwPreferencesPage" id="preferences_page">
 
-
-        <!-- Files overview -->
-        <child>
-          <object class="AdwPreferencesGroup" id="files_group">
+            <!-- Calendar -->
             <child>
-              <object class="GtkSpinner" id="placeholder_spinner">
-                <property name="halign">center</property>
-                <property name="valign">center</property>
-                <property name="spinning">True</property>
+              <object class="AdwPreferencesGroup">
+                <child>
+                  <object class="AdwComboRow" id="calendar_combo_row">
+                    <property name="activatable">True</property>
+                    <property name="title" translatable="yes">C_alendar</property>
+                    <property name="use-underline">True</property>
+                    <property name="factory">
+                      <object class="GtkSignalListItemFactory">
+                        <signal name="bind" handler="on_combo_row_signal_factory_bind_cb" object="GcalImportDialog" swapped="no" />
+                        <signal name="setup" handler="on_combo_row_signal_factory_setup_cb" object="GcalImportDialog" swapped="no" />
+                      </object>
+                    </property>
+                    <signal name="notify::selected-item" handler="on_calendar_combo_row_selected_item_changed_cb" object="GcalImportDialog" swapped="no" />
+                  </object>
+                </child>
               </object>
             </child>
+
+
+            <!-- Files overview -->
+            <child>
+              <object class="AdwPreferencesGroup" id="files_group">
+                <child>
+                  <object class="GtkSpinner" id="placeholder_spinner">
+                    <property name="halign">center</property>
+                    <property name="valign">center</property>
+                    <property name="spinning">True</property>
+                  </object>
+                </child>
+              </object>
+            </child>
+
           </object>
-        </child>
-
+        </property>
       </object>
-    </child>
-
+    </property>
   </template>
 
   <object class="GtkSizeGroup" id="title_sizegroup">