diff --git a/sitewide_alert.libraries.yml b/sitewide_alert.libraries.yml
index 652cb35..8e6d563 100644
--- a/sitewide_alert.libraries.yml
+++ b/sitewide_alert.libraries.yml
@@ -1,4 +1,8 @@
 # Global/3rd party libraries
+polyfill:
+  version: 3
+  js:
+    https://polyfill.io/v3/polyfill.min.js?features=fetch: {external: true}
 react:
   version: 16.8.4
   js:
@@ -19,5 +23,8 @@ init:
     theme:
       css/sitewide_alert.css: {}
   dependencies:
+    - sitewide_alert/polyfill
+    - sitewide_alert/react
+    - sitewide_alert/react-dom
     - core/drupal
     - core/drupalSettings
diff --git a/sitewide_alert.module b/sitewide_alert.module
index 7892a19..c589f21 100644
--- a/sitewide_alert.module
+++ b/sitewide_alert.module
@@ -38,8 +38,6 @@ function sitewide_alert_page_top(array &$page_top) {
     '#markup' => '<div id="sitewide-alert"></div>',
     '#attached' => [
       'library' => [
-        'sitewide_alert/react',
-        'sitewide_alert/react-dom',
         'sitewide_alert/init',
       ],
       'drupalSettings' => [