diff --git a/client/components/app/BookShelfToolbar.vue b/client/components/app/BookShelfToolbar.vue
index d512bc1b..a3879279 100644
--- a/client/components/app/BookShelfToolbar.vue
+++ b/client/components/app/BookShelfToolbar.vue
@@ -163,6 +163,14 @@ export default {
           text: this.$strings.LabelAddedAt,
           value: 'addedAt'
         },
+        {
+          text: this.$strings.LabelLastBookAdded,
+          value: 'lastBookAdded'
+        },
+        {
+          text: this.$strings.LabelLastBookUpdated,
+          value: 'lastBookUpdated'
+        },
         {
           text: this.$strings.LabelTotalDuration,
           value: 'totalDuration'
diff --git a/client/components/cards/LazySeriesCard.vue b/client/components/cards/LazySeriesCard.vue
index db5e3ec5..313530b6 100644
--- a/client/components/cards/LazySeriesCard.vue
+++ b/client/components/cards/LazySeriesCard.vue
@@ -81,13 +81,20 @@ export default {
       return this.title
     },
     displaySortLine() {
-      if (this.orderBy === 'addedAt') {
-        // return this.addedAt
-        return 'Added ' + this.$formatDate(this.addedAt, this.dateFormat)
-      } else if (this.orderBy === 'totalDuration') {
-        return 'Duration: ' + this.$elapsedPrettyExtended(this.totalDuration, false)
+      switch (this.orderBy) {
+        case 'addedAt':
+          return `${this.$strings.LabelAdded} ${this.$formatDate(this.addedAt, this.dateFormat)}`
+        case 'totalDuration':
+          return `${this.$strings.LabelDuration} ${this.$elapsedPrettyExtended(this.totalDuration, false)}` 
+        case 'lastBookUpdated':
+          const lastUpdated = Math.max(...(this.books).map(x => x.updatedAt), 0)
+          return `${this.$strings.LabelLastBookUpdated} ${this.$formatDate(lastUpdated, this.dateFormat)}`
+        case 'lastBookAdded':
+          const lastBookAdded = Math.max(...(this.books).map(x => x.addedAt), 0)
+          return `${this.$strings.LabelLastBookAdded} ${this.$formatDate(lastBookAdded, this.dateFormat)}` 
+        default:
+          return null
       }
-      return null
     },
     books() {
       return this.series ? this.series.books || [] : []
diff --git a/client/strings/de.json b/client/strings/de.json
index 4cac3511..5f09a73d 100644
--- a/client/strings/de.json
+++ b/client/strings/de.json
@@ -161,6 +161,7 @@
   "LabelAccountTypeGuest": "Gast",
   "LabelAccountTypeUser": "Benutzer",
   "LabelActivity": "Aktivitäten",
+  "LabelAdded": "Added",
   "LabelAddedAt": "Hinzugefügt am",
   "LabelAddToCollection": "Zur Sammlung hinzufügen",
   "LabelAddToCollectionBatch": "Füge {0} Hörbüch(er)/Podcast(s) der Sammlung hinzu",
@@ -250,6 +251,8 @@
   "LabelItem": "Medium",
   "LabelLanguage": "Sprache",
   "LabelLanguageDefaultServer": "Standard-Server-Sprache",
+  "LabelLastBookAdded": "Last Book Added",
+  "LabelLastBookUpdated": "Last Book Updated",
   "LabelLastSeen": "Zuletzt angesehen",
   "LabelLastTime": "Letztes Mal",
   "LabelLastUpdate": "Letzte Aktualisierung",
diff --git a/client/strings/en-us.json b/client/strings/en-us.json
index 1ea2fa27..029c0422 100644
--- a/client/strings/en-us.json
+++ b/client/strings/en-us.json
@@ -161,6 +161,7 @@
   "LabelAccountTypeGuest": "Guest",
   "LabelAccountTypeUser": "User",
   "LabelActivity": "Activity",
+  "LabelAdded": "Added",
   "LabelAddedAt": "Added At",
   "LabelAddToCollection": "Add to Collection",
   "LabelAddToCollectionBatch": "Add {0} Books to Collection",
@@ -250,6 +251,8 @@
   "LabelItem": "Item",
   "LabelLanguage": "Language",
   "LabelLanguageDefaultServer": "Default Server Language",
+  "LabelLastBookAdded": "Last Book Added",
+  "LabelLastBookUpdated": "Last Book Updated",
   "LabelLastSeen": "Last Seen",
   "LabelLastTime": "Last Time",
   "LabelLastUpdate": "Last Update",
diff --git a/client/strings/es.json b/client/strings/es.json
index 17c13698..b74d8f27 100644
--- a/client/strings/es.json
+++ b/client/strings/es.json
@@ -161,6 +161,7 @@
   "LabelAccountTypeGuest": "Invitado",
   "LabelAccountTypeUser": "Usuario",
   "LabelActivity": "Actividad",
+  "LabelAdded": "Added",
   "LabelAddedAt": "Añadido",
   "LabelAddToCollection": "Añadido a la Colección",
   "LabelAddToCollectionBatch": "Se Añadieron {0} Libros a la Colección",
@@ -250,6 +251,8 @@
   "LabelItem": "Elemento",
   "LabelLanguage": "Lenguaje",
   "LabelLanguageDefaultServer": "Lenguaje Predeterminado del Servidor",
+  "LabelLastBookAdded": "Last Book Added",
+  "LabelLastBookUpdated": "Last Book Updated",
   "LabelLastSeen": "Ultima Vez Visto",
   "LabelLastTime": "Ultima Vez",
   "LabelLastUpdate": "Ultima Actualización",
diff --git a/client/strings/fr.json b/client/strings/fr.json
index 98e527f6..397b5958 100644
--- a/client/strings/fr.json
+++ b/client/strings/fr.json
@@ -161,6 +161,7 @@
   "LabelAccountTypeGuest": "Invité",
   "LabelAccountTypeUser": "Utilisateur",
   "LabelActivity": "Activité",
+  "LabelAdded": "Added",
   "LabelAddedAt": "Date d’ajout",
   "LabelAddToCollection": "Ajouter à la collection",
   "LabelAddToCollectionBatch": "Ajout de {0} livres à la lollection",
@@ -250,6 +251,8 @@
   "LabelItem": "Article",
   "LabelLanguage": "Langue",
   "LabelLanguageDefaultServer": "Langue par défaut",
+  "LabelLastBookAdded": "Last Book Added",
+  "LabelLastBookUpdated": "Last Book Updated",
   "LabelLastSeen": "Vu dernièrement",
   "LabelLastTime": "Progression",
   "LabelLastUpdate": "Dernière mise à jour",
diff --git a/client/strings/gu.json b/client/strings/gu.json
index ebc3d2df..ca8be820 100644
--- a/client/strings/gu.json
+++ b/client/strings/gu.json
@@ -161,6 +161,7 @@
   "LabelAccountTypeGuest": "Guest",
   "LabelAccountTypeUser": "User",
   "LabelActivity": "Activity",
+  "LabelAdded": "Added",
   "LabelAddedAt": "Added At",
   "LabelAddToCollection": "Add to Collection",
   "LabelAddToCollectionBatch": "Add {0} Books to Collection",
@@ -250,6 +251,8 @@
   "LabelItem": "Item",
   "LabelLanguage": "Language",
   "LabelLanguageDefaultServer": "Default Server Language",
+  "LabelLastBookAdded": "Last Book Added",
+  "LabelLastBookUpdated": "Last Book Updated",
   "LabelLastSeen": "Last Seen",
   "LabelLastTime": "Last Time",
   "LabelLastUpdate": "Last Update",
@@ -639,4 +642,4 @@
   "ToastSocketFailedToConnect": "Socket failed to connect",
   "ToastUserDeleteFailed": "Failed to delete user",
   "ToastUserDeleteSuccess": "User deleted"
-}
+}
\ No newline at end of file
diff --git a/client/strings/hi.json b/client/strings/hi.json
index d1dcd1d7..29092ed7 100644
--- a/client/strings/hi.json
+++ b/client/strings/hi.json
@@ -161,6 +161,7 @@
   "LabelAccountTypeGuest": "Guest",
   "LabelAccountTypeUser": "User",
   "LabelActivity": "Activity",
+  "LabelAdded": "Added",
   "LabelAddedAt": "Added At",
   "LabelAddToCollection": "Add to Collection",
   "LabelAddToCollectionBatch": "Add {0} Books to Collection",
@@ -250,6 +251,8 @@
   "LabelItem": "Item",
   "LabelLanguage": "Language",
   "LabelLanguageDefaultServer": "Default Server Language",
+  "LabelLastBookAdded": "Last Book Added",
+  "LabelLastBookUpdated": "Last Book Updated",
   "LabelLastSeen": "Last Seen",
   "LabelLastTime": "Last Time",
   "LabelLastUpdate": "Last Update",
diff --git a/client/strings/hr.json b/client/strings/hr.json
index 69dcef74..97c740ba 100644
--- a/client/strings/hr.json
+++ b/client/strings/hr.json
@@ -161,6 +161,7 @@
   "LabelAccountTypeGuest": "Gost",
   "LabelAccountTypeUser": "Korisnik",
   "LabelActivity": "Aktivnost",
+  "LabelAdded": "Added",
   "LabelAddedAt": "Added At",
   "LabelAddToCollection": "Dodaj u kolekciju",
   "LabelAddToCollectionBatch": "Add {0} Books to Collection",
@@ -250,6 +251,8 @@
   "LabelItem": "Stavka",
   "LabelLanguage": "Jezik",
   "LabelLanguageDefaultServer": "Default jezik servera",
+  "LabelLastBookAdded": "Last Book Added",
+  "LabelLastBookUpdated": "Last Book Updated",
   "LabelLastSeen": "Zadnje pogledano",
   "LabelLastTime": "Prošli put",
   "LabelLastUpdate": "Zadnja aktualizacija",
diff --git a/client/strings/it.json b/client/strings/it.json
index 1eecc3fc..b81ca9e5 100644
--- a/client/strings/it.json
+++ b/client/strings/it.json
@@ -161,6 +161,7 @@
   "LabelAccountTypeGuest": "Ospite",
   "LabelAccountTypeUser": "Utente",
   "LabelActivity": "Attività",
+  "LabelAdded": "Added",
   "LabelAddedAt": "Aggiunto il",
   "LabelAddToCollection": "Aggiungi alla Raccolta",
   "LabelAddToCollectionBatch": "Aggiungi {0} Libri alla Raccolta",
@@ -250,6 +251,8 @@
   "LabelItem": "Oggetti",
   "LabelLanguage": "Lingua",
   "LabelLanguageDefaultServer": "Lingua di Default",
+  "LabelLastBookAdded": "Last Book Added",
+  "LabelLastBookUpdated": "Last Book Updated",
   "LabelLastSeen": "Ultimi Visti",
   "LabelLastTime": "Ultima Volta",
   "LabelLastUpdate": "Ultimo Aggiornamento",
diff --git a/client/strings/pl.json b/client/strings/pl.json
index ed0ba345..12402df4 100644
--- a/client/strings/pl.json
+++ b/client/strings/pl.json
@@ -161,6 +161,7 @@
   "LabelAccountTypeGuest": "Gość",
   "LabelAccountTypeUser": "Użytkownik",
   "LabelActivity": "Aktywność",
+  "LabelAdded": "Added",
   "LabelAddedAt": "Dodano",
   "LabelAddToCollection": "Dodaj do kolekcji",
   "LabelAddToCollectionBatch": "Dodaj {0} książki do kolekcji",
@@ -250,6 +251,8 @@
   "LabelItem": "Pozycja",
   "LabelLanguage": "Język",
   "LabelLanguageDefaultServer": "Domyślny język serwera",
+  "LabelLastBookAdded": "Last Book Added",
+  "LabelLastBookUpdated": "Last Book Updated",
   "LabelLastSeen": "Ostatnio widziany",
   "LabelLastTime": "Ostatni czas",
   "LabelLastUpdate": "Ostatnia aktualizacja",
diff --git a/client/strings/ru.json b/client/strings/ru.json
index 1227d516..45c64498 100644
--- a/client/strings/ru.json
+++ b/client/strings/ru.json
@@ -161,6 +161,7 @@
   "LabelAccountTypeGuest": "Гость",
   "LabelAccountTypeUser": "Пользователь",
   "LabelActivity": "Активность",
+  "LabelAdded": "Added",
   "LabelAddedAt": "Дата добавления",
   "LabelAddToCollection": "Добавить в коллекцию",
   "LabelAddToCollectionBatch": "Добавить {0} книг в коллекцию",
@@ -250,6 +251,8 @@
   "LabelItem": "Элемент",
   "LabelLanguage": "Язык",
   "LabelLanguageDefaultServer": "Язык сервера по умолчанию",
+  "LabelLastBookAdded": "Last Book Added",
+  "LabelLastBookUpdated": "Last Book Updated",
   "LabelLastSeen": "Последнее сканирование",
   "LabelLastTime": "Последний по времени",
   "LabelLastUpdate": "Последний обновленный",
diff --git a/client/strings/zh-cn.json b/client/strings/zh-cn.json
index 3a9b0c9c..bf84b937 100644
--- a/client/strings/zh-cn.json
+++ b/client/strings/zh-cn.json
@@ -161,6 +161,7 @@
   "LabelAccountTypeGuest": "来宾",
   "LabelAccountTypeUser": "用户",
   "LabelActivity": "活动",
+  "LabelAdded": "Added",
   "LabelAddedAt": "添加于",
   "LabelAddToCollection": "添加到收藏",
   "LabelAddToCollectionBatch": "批量添加 {0} 个媒体到收藏",
@@ -250,6 +251,8 @@
   "LabelItem": "项目",
   "LabelLanguage": "语言",
   "LabelLanguageDefaultServer": "默认服务器语言",
+  "LabelLastBookAdded": "Last Book Added",
+  "LabelLastBookUpdated": "Last Book Updated",
   "LabelLastSeen": "上次查看时间",
   "LabelLastTime": "最近一次",
   "LabelLastUpdate": "最近更新",
diff --git a/server/controllers/LibraryController.js b/server/controllers/LibraryController.js
index bbc70f31..154f6f17 100644
--- a/server/controllers/LibraryController.js
+++ b/server/controllers/LibraryController.js
@@ -417,6 +417,10 @@ class LibraryController {
             return se.totalDuration
           } else if (payload.sortBy === 'addedAt') {
             return se.addedAt
+          } else if (payload.sortBy === 'lastBookUpdated') {
+            return Math.max(...(se.books).map(x => x.updatedAt), 0)
+          } else if (payload.sortBy === 'lastBookAdded') {
+            return Math.max(...(se.books).map(x => x.addedAt), 0)
           } else { // sort by name
             return this.db.serverSettings.sortingIgnorePrefix ? se.nameIgnorePrefixSort : se.name
           }