diff --git a/.travis.yml b/.travis.yml
index 0bf66d5..7522fdb 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -28,16 +28,18 @@ env:
 
 matrix:
   include:
-    - php: 5.6
-      env: DB=pgsql  MOODLE_BRANCH=MOODLE_33_STABLE NODEJS=8
     - php: 7.0
-      env: DB=mysqli MOODLE_BRANCH=MOODLE_35_STABLE
-    - php: 7.1
-      env: DB=mysqli MOODLE_BRANCH=MOODLE_33_STABLE NODEJS=8
+      env: DB=pgsql MOODLE_BRANCH=MOODLE_35_STABLE
+    - php: 7.0
+      env: DB=mysqli MOODLE_BRANCH=MOODLE_36_STABLE NODEJS=8
+    - php: 7.2
+      env: DB=pgsql MOODLE_BRANCH=MOODLE_37_STABLE
+    - php: 7.2
+      env: DB=pgsql MOODLE_BRANCH=MOODLE_38_STABLE
     - php: 7.4
-      env: DB=mysqli MOODLE_BRANCH=master
-    - php: 7.4
-      env: DB=pgsql MOODLE_BRANCH=master
+      env: DB=pgsql MOODLE_BRANCH=MOODLE_39_STABLE
+    - php: 7.2
+      env: DB=mysqli MOODLE_BRANCH=MOODLE_39_STABLE
 
 before_install:
   - export MOODLE_VERSION=$(echo "$MOODLE_BRANCH" | cut -d'_' -f 2)
diff --git a/classes/local/outagelib.php b/classes/local/outagelib.php
index c651e7c..e17dce1 100644
--- a/classes/local/outagelib.php
+++ b/classes/local/outagelib.php
@@ -103,6 +103,7 @@ class outagelib {
      * @return string|void CSS and HTML for the warning bar if it should be displayed
      */
     public static function get_inject_code() {
+        global $PAGE;
         // Ensure we do not kill the whole website in case of an error.
         try {
             // Check if we should inject the code.
@@ -132,7 +133,8 @@ class outagelib {
             }
 
             // There is a previewing or active outage.
-            return renderer::get()->render_warningbar($active, $time, false, $preview);
+            $renderer = $PAGE->get_renderer('auth_outage');
+            return $renderer->render_warningbar($active, $time, false, $preview);
         } catch (Exception $e) {
             debugging('Exception occured while injecting our code: '.$e->getMessage());
             debugging($e->getTraceAsString(), DEBUG_DEVELOPER);
diff --git a/classes/output/renderer.php b/classes/output/renderer.php
index d8f59bd..55cb854 100644
--- a/classes/output/renderer.php
+++ b/classes/output/renderer.php
@@ -44,15 +44,6 @@ defined('MOODLE_INTERNAL') || die();
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 class renderer extends plugin_renderer_base {
-    /**
-     * Returns the outage renderer.
-     * @return renderer The outage renderer.
-     */
-    public static function get() {
-        global $PAGE;
-        return $PAGE->get_renderer('auth_outage');
-    }
-
     /**
      * Outputs the view in a separate scope to avoid conflicts with variable names.
      * @param string $view View PHP file.
@@ -154,8 +145,6 @@ class renderer extends plugin_renderer_base {
      * @return string The formatted HTML.
      */
     private function renderoutage(outage $outage, $buttons) {
-        global $OUTPUT;
-
         if ($outage->createdby == 0) {
             $created = get_string('na', 'auth_outage');
         } else {
@@ -179,14 +168,14 @@ class renderer extends plugin_renderer_base {
         $url = new moodle_url('/auth/outage/edit.php', ['edit' => $outage->id]);
         $img = html_writer::empty_tag(
             'img',
-            ['src' => $OUTPUT->image_url('t/edit'), 'alt' => get_string('edit'), 'class' => 'iconsmall']
+            ['src' => $this->output->image_url('t/edit'), 'alt' => get_string('edit'), 'class' => 'iconsmall']
         );
         $linkedit = html_writer::link($url, $img, ['title' => get_string('edit')]);
 
         $url = new moodle_url('/auth/outage/delete.php', ['id' => $outage->id]);
         $img = html_writer::empty_tag(
             'img',
-            ['src' => $OUTPUT->image_url('t/delete'), 'alt' => get_string('delete'), 'class' => 'iconsmall']
+            ['src' => $this->output->image_url('t/delete'), 'alt' => get_string('delete'), 'class' => 'iconsmall']
         );
         $linkdelete = html_writer::link($url, $img, ['title' => get_string('delete')]);
 
diff --git a/delete.php b/delete.php
index eb594a2..b3a9713 100644
--- a/delete.php
+++ b/delete.php
@@ -33,6 +33,7 @@ require_once($CFG->libdir.'/formslib.php');
 
 admin_externalpage_setup('auth_outage_manage');
 $PAGE->set_url(new moodle_url('/auth/outage/manage.php'));
+$output = $PAGE->get_renderer('auth_outage');
 
 $mform = new delete();
 if ($mform->is_cancelled()) {
@@ -52,10 +53,10 @@ $dataid = new stdClass();
 $dataid->id = $outage->id;
 $mform->set_data($dataid);
 
-echo $OUTPUT->header();
+echo $output->header();
 
-echo renderer::get()->renderdeleteconfirmation($outage);
+echo $output->renderdeleteconfirmation($outage);
 
 $mform->display();
 
-echo $OUTPUT->footer();
+echo $output->footer();
diff --git a/edit.php b/edit.php
index e2b0e18..eebb285 100644
--- a/edit.php
+++ b/edit.php
@@ -34,6 +34,7 @@ require_once($CFG->libdir.'/adminlib.php');
 require_once($CFG->libdir.'/formslib.php');
 
 admin_externalpage_setup('auth_outage_manage');
+$output = $PAGE->get_renderer('auth_outage');
 $PAGE->set_url(new moodle_url('/auth/outage/manage.php'));
 
 $mform = new edit();
@@ -83,7 +84,7 @@ if ($outage == null) {
 $mform->set_data($outage);
 
 $PAGE->navbar->add(get_string($action.'crumb', 'auth_outage'));
-echo $OUTPUT->header();
-echo renderer::get()->rendersubtitle($action);
+echo $output->header();
+echo $output->rendersubtitle($action);
 $mform->display();
-echo $OUTPUT->footer();
+echo $output->footer();
diff --git a/finish.php b/finish.php
index 047e3eb..868b1bf 100644
--- a/finish.php
+++ b/finish.php
@@ -33,6 +33,7 @@ require_once($CFG->libdir.'/formslib.php');
 
 admin_externalpage_setup('auth_outage_manage');
 $PAGE->set_url(new moodle_url('/auth/outage/manage.php'));
+$output = $PAGE->get_renderer('auth_outage');
 
 $mform = new finish();
 if ($mform->is_cancelled()) {
@@ -52,10 +53,10 @@ $dataid = new stdClass();
 $dataid->id = $outage->id;
 $mform->set_data($dataid);
 
-echo $OUTPUT->header();
+echo $output->header();
 
-echo renderer::get()->renderfinishconfirmation($outage);
+echo $output->renderfinishconfirmation($outage);
 
 $mform->display();
 
-echo $OUTPUT->footer();
+echo $output->footer();
diff --git a/manage.php b/manage.php
index 967d083..582438d 100644
--- a/manage.php
+++ b/manage.php
@@ -32,16 +32,17 @@ require_once($CFG->libdir.'/adminlib.php');
 
 admin_externalpage_setup('auth_outage_manage');
 $PAGE->set_url(new moodle_url('/auth/outage/manage.php'));
+$output = $PAGE->get_renderer('auth_outage');
 
-echo $OUTPUT->header();
+echo $output->header();
 
 // Give it a consistent time so all outages are listed. Useful when debugging.
 $now = time();
 
-renderer::get()->output_view('manage.php', [
+$output->output_view('manage.php', [
     'unended' => outagedb::get_all_unended($now),
     'ended'   => outagedb::get_all_ended($now),
     'warning' => outagelib::generate_plugin_configuration_warning(),
 ]);
 
-echo $OUTPUT->footer();
+echo $output->footer();
diff --git a/views/manage.php b/views/manage.php
index f2fee40..94a997f 100644
--- a/views/manage.php
+++ b/views/manage.php
@@ -31,14 +31,15 @@ use auth_outage\local\outagelib;
 
 defined('MOODLE_INTERNAL') || die();
 
-global $OUTPUT;
+global $PAGE;
+$output = $PAGE->get_renderer('auth_outage');
 $urlnew = new moodle_url('/auth/outage/edit.php');
 
 echo $viewbag['warning'];
 ?>
 
 <section id="section_planned_outages">
-    <?php echo renderer::get()->rendersubtitle('outageslistfuture'); ?>
+    <?php echo $output->rendersubtitle('outageslistfuture'); ?>
     <?php if (empty($viewbag['unended'])): ?>
         <p>
             <small><?php echo get_string('notfound', 'auth_outage'); ?></small>
@@ -61,7 +62,7 @@ echo $viewbag['warning'];
             echo '<p>';
             $next = outagelib::get_next_window($next);
             $urlnew->param('starttime', $next);
-            echo $OUTPUT->single_button($urlnew, get_string('outagecreate', 'auth_outage'));
+            echo $output->single_button($urlnew, get_string('outagecreate', 'auth_outage'));
             if ($default) {
                 echo ' ' . userdate( $next, get_string('datetimeformat', 'auth_outage'));
             }
@@ -70,7 +71,7 @@ echo $viewbag['warning'];
 </section>
 
 <section id="section_outage_history">
-    <?php echo renderer::get()->rendersubtitle('outageslistpast'); ?>
+    <?php echo $output->rendersubtitle('outageslistpast'); ?>
     <?php if (empty($viewbag['ended'])): ?>
         <p>
             <small><?php echo get_string('notfound', 'auth_outage'); ?></small>