diff --git a/CHANGELOG.md b/CHANGELOG.md
index ee8b7f6e04..424e0bafb9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,7 @@ HumHub Changelog
 - Fix #6674: Fix visibility of draft and scheduled content on dashboard
 - Fix #6679: On the space invitation by link page, the language chooser doesn't save the selected language
 - Fix #6677: Do not check mobile push module in requirements check on installation
+- Fix #6700: Reload theme variable `@baseTheme` after flushing cache
 
 1.15.0 (November 6, 2023)
 --------------------------------
diff --git a/protected/humhub/modules/admin/controllers/SettingController.php b/protected/humhub/modules/admin/controllers/SettingController.php
index e168cc0c41..53395e6e98 100644
--- a/protected/humhub/modules/admin/controllers/SettingController.php
+++ b/protected/humhub/modules/admin/controllers/SettingController.php
@@ -129,7 +129,7 @@ class SettingController extends Controller
         if ($form->load(Yii::$app->request->post()) && $form->validate() && $form->save()) {
             Yii::$app->cache->flush();
             Yii::$app->assetManager->clear();
-            Yii::$app->view->theme->variables->flushCache();
+            Yii::$app->view->theme->activate();
             $this->view->success(Yii::t('AdminModule.settings', 'Saved and flushed cache'));
             return $this->redirect(['/admin/setting/caching']);
         }