diff --git a/src/Application.vala b/src/Application.vala
index a1c4e0d4..35555946 100644
--- a/src/Application.vala
+++ b/src/Application.vala
@@ -180,9 +180,6 @@ public class AppCenter.App : Gtk.Application {
     }
 
     public override void activate () {
-        if (fake_update_packages != null) {
-            AppCenterCore.PackageKitBackend.get_default ().fake_packages = fake_update_packages;
-        }
 
         var client = AppCenterCore.Client.get_default ();
 
@@ -200,12 +197,6 @@ public class AppCenter.App : Gtk.Application {
 
         if (local_path != null) {
             var file = File.new_for_commandline_arg (local_path);
-
-            try {
-                local_package = AppCenterCore.PackageKitBackend.get_default ().add_local_component_file (file);
-            } catch (Error e) {
-                warning ("Failed to load local AppStream XML file: %s", e.message);
-            }
         }
 
         if (active_window == null) {
diff --git a/src/Core/BackendAggregator.vala b/src/Core/BackendAggregator.vala
index 1747cd3b..20077394 100644
--- a/src/Core/BackendAggregator.vala
+++ b/src/Core/BackendAggregator.vala
@@ -26,8 +26,6 @@ public class AppCenterCore.BackendAggregator : Backend, Object {
 
     construct {
         backends = new Gee.ArrayList<unowned Backend> ();
-        backends.add (PackageKitBackend.get_default ());
-        backends.add (UbuntuDriversBackend.get_default ());
         backends.add (FlatpakBackend.get_default ());
 
         unowned Gtk.Application app = (Gtk.Application) GLib.Application.get_default ();
diff --git a/src/Core/Package.vala b/src/Core/Package.vala
index 40fa8262..e6b90dd9 100644
--- a/src/Core/Package.vala
+++ b/src/Core/Package.vala
@@ -327,23 +327,13 @@ public class AppCenterCore.Package : Object {
     public string origin_description {
         owned get {
             unowned string origin = component.get_origin ();
-            if (backend is PackageKitBackend) {
-                if (origin == APPCENTER_PACKAGE_ORIGIN) {
-                    return _("AppCenter");
-                } else if (origin == ELEMENTARY_STABLE_PACKAGE_ORIGIN) {
-                    return _("elementary Updates");
-                } else if (origin.has_prefix ("ubuntu-")) {
-                    return _("Ubuntu (non-curated)");
-                }
-            } else if (backend is FlatpakBackend) {
+            if (backend is FlatpakBackend) {
                 var fp_package = this as FlatpakPackage;
                 if (fp_package == null) {
                     return origin;
                 }
 
                 return fp_package.remote_title;
-            } else if (backend is UbuntuDriversBackend) {
-                return _("Ubuntu Drivers");
             }
 
             return _("Unknown Origin (non-curated)");
@@ -435,9 +425,7 @@ public class AppCenterCore.Package : Object {
 
         // The version on a PackageKit package comes from the package not AppStream, so only reset the version
         // on other backends
-        if (!(backend is PackageKitBackend)) {
-            _latest_version = null;
-        }
+        _latest_version = null;
 
         this.component = component;
     }
diff --git a/src/Core/UpdateManager.vala b/src/Core/UpdateManager.vala
index 4d844abc..457137eb 100644
--- a/src/Core/UpdateManager.vala
+++ b/src/Core/UpdateManager.vala
@@ -71,35 +71,9 @@ public class AppCenterCore.UpdateManager : Object {
             installed_package.update_state ();
         }
 
-        Pk.Results pk_updates;
-        unowned PackageKitBackend client = PackageKitBackend.get_default ();
-        try {
-            pk_updates = yield client.get_updates (cancellable);
-        } catch (Error e) {
-            warning ("Unable to get updates from PackageKit backend: %s", e.message);
-            return 0;
-        }
-
         uint os_count = 0;
         string os_desc = "";
 
-        var package_array = pk_updates.get_package_array ();
-        debug ("PackageKit backend reports %d updates", package_array.length);
-
-        package_array.foreach ((pk_package) => {
-            var pkg_name = pk_package.get_name ();
-            debug ("Added %s to OS updates", pkg_name);
-            os_count++;
-            unowned string pkg_summary = pk_package.get_summary ();
-            unowned string pkg_version = pk_package.get_version ();
-            os_desc += Markup.printf_escaped (
-                " • %s\n\t%s\n\t%s\n",
-                pkg_name,
-                pkg_summary,
-                _("Version: %s").printf (pkg_version)
-            );
-        });
-
         os_updates.component.set_pkgnames ({});
         os_updates.change_information.clear_update_info ();
 
@@ -207,30 +181,13 @@ public class AppCenterCore.UpdateManager : Object {
             count += 1;
         }
 
-        pk_updates.get_details_array ().foreach ((pk_detail) => {
-            var pk_package = new Pk.Package ();
-            try {
-                pk_package.set_id (pk_detail.get_package_id ());
-                var pkg_name = pk_package.get_name ();
-
-                var pkgnames = os_updates.component.pkgnames;
-                pkgnames += pkg_name;
-                os_updates.component.pkgnames = pkgnames;
-
-                os_updates.change_information.updatable_packages.@set (client, pk_package.get_id ());
-                os_updates.change_information.size += pk_detail.size;
-            } catch (Error e) {
-                critical (e.message);
-            }
-        });
-
         os_updates.update_state ();
         runtime_updates.update_state ();
         return count;
     }
 
     public void update_restart_state () {
-        var should_restart = restart_file.query_exists () || PackageKitBackend.get_default ().is_restart_required ();
+        var should_restart = restart_file.query_exists ();
 
         if (should_restart) {
             if (!restart_required) {
diff --git a/src/meson.build b/src/meson.build
index e0ef5342..14319492 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -12,10 +12,8 @@ appcenter_files = files(
     'Core/FlatpakBackend.vala',
     'Core/Job.vala',
     'Core/Package.vala',
-    'Core/PackageKitBackend.vala',
     'Core/ScreenshotCache.vala',
     'Core/Task.vala',
-    'Core/UbuntuDriversBackend.vala',
     'Core/UpdateManager.vala',
     'Dialogs/InstallFailDialog.vala',
     'Dialogs/StripeDialog.vala',