diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index dfa2f30f7..bc8b07baf 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -132,6 +132,7 @@ jobs:
           - ember-lts-3.20
           - ember-lts-3.24
           - ember-lts-3.28
+          - ember-lts-4.4
           - ember-release
           - ember-beta
           - ember-canary
diff --git a/packages/ember-cli-fastboot/config/ember-try.js b/packages/ember-cli-fastboot/config/ember-try.js
index 0415f321b..ccacb0dc1 100644
--- a/packages/ember-cli-fastboot/config/ember-try.js
+++ b/packages/ember-cli-fastboot/config/ember-try.js
@@ -43,6 +43,14 @@ module.exports = async function () {
           },
         },
       },
+      {
+        name: 'ember-lts-4.4',
+        npm: {
+          devDependencies: {
+            'ember-source': '~4.4.0',
+          },
+        },
+      },
       {
         name: 'ember-release',
         npm: {
diff --git a/packages/ember-cli-fastboot/fastboot/initializers/ajax.js b/packages/ember-cli-fastboot/fastboot/initializers/ajax.js
index eeef2b9ee..ab505cc0a 100644
--- a/packages/ember-cli-fastboot/fastboot/initializers/ajax.js
+++ b/packages/ember-cli-fastboot/fastboot/initializers/ajax.js
@@ -30,7 +30,5 @@ export default {
 
   initialize: function(application) {
     application.register('ajax:node', nodeAjax, { instantiate: false });
-    application.inject('adapter', '_ajaxRequest', 'ajax:node');
-    application.inject('adapter', 'fastboot', 'service:fastboot');
   }
 };