diff --git a/aleksis/core/settings.py b/aleksis/core/settings.py
index 775dd392c5f79e3c43aeae19c3eea1247397457f..e1e286193a14760bb67a8395c12cca85967953bb 100644
--- a/aleksis/core/settings.py
+++ b/aleksis/core/settings.py
@@ -620,6 +620,7 @@ YARN_INSTALLED_APPS = [
     "stylelint-config-standard@^29.0.0",
     "stylelint-config-prettier@^9.0.3",
     "vue-draggable-grid@^0.1.0-post0",
+    "rrule",
 ]
 
 merge_app_settings("YARN_INSTALLED_APPS", YARN_INSTALLED_APPS, True)