diff --git a/lib/plexapi/audio.py b/lib/plexapi/audio.py
index 0eb397cc..8f84f3be 100644
--- a/lib/plexapi/audio.py
+++ b/lib/plexapi/audio.py
@@ -181,6 +181,7 @@ class Artist(
             TYPE (str): 'artist'
             albumSort (int): Setting that indicates how albums are sorted for the artist
                 (-1 = Library default, 0 = Newest first, 1 = Oldest first, 2 = By name).
+            audienceRating (float): Audience rating.
             collections (List<:class:`~plexapi.media.Collection`>): List of collection objects.
             countries (List<:class:`~plexapi.media.Country`>): List country objects.
             genres (List<:class:`~plexapi.media.Genre`>): List of genre objects.
@@ -188,6 +189,7 @@ class Artist(
             key (str): API URL (/library/metadata/<ratingkey>).
             labels (List<:class:`~plexapi.media.Label`>): List of label objects.
             locations (List<str>): List of folder paths where the artist is found on disk.
+            rating (float): Artist rating (7.9; 9.8; 8.1).
             similar (List<:class:`~plexapi.media.Similar`>): List of similar objects.
             styles (List<:class:`~plexapi.media.Style`>): List of style objects.
             theme (str): URL to theme resource (/library/metadata/<ratingkey>/theme/<themeid>).
@@ -199,6 +201,7 @@ class Artist(
         """ Load attribute values from Plex XML response. """
         Audio._loadData(self, data)
         self.albumSort = utils.cast(int, data.attrib.get('albumSort', '-1'))
+        self.audienceRating = utils.cast(float, data.attrib.get('audienceRating'))
         self.collections = self.findItems(data, media.Collection)
         self.countries = self.findItems(data, media.Country)
         self.genres = self.findItems(data, media.Genre)
@@ -206,6 +209,7 @@ class Artist(
         self.key = self.key.replace('/children', '')  # FIX_BUG_50
         self.labels = self.findItems(data, media.Label)
         self.locations = self.listAttrs(data, 'path', etag='Location')
+        self.rating = utils.cast(float, data.attrib.get('rating'))
         self.similar = self.findItems(data, media.Similar)
         self.styles = self.findItems(data, media.Style)
         self.theme = data.attrib.get('theme')
@@ -301,6 +305,7 @@ class Album(
         Attributes:
             TAG (str): 'Directory'
             TYPE (str): 'album'
+            audienceRating (float): Audience rating.
             collections (List<:class:`~plexapi.media.Collection`>): List of collection objects.
             formats (List<:class:`~plexapi.media.Format`>): List of format objects.
             genres (List<:class:`~plexapi.media.Genre`>): List of genre objects.
@@ -329,6 +334,7 @@ class Album(
     def _loadData(self, data):
         """ Load attribute values from Plex XML response. """
         Audio._loadData(self, data)
+        self.audienceRating = utils.cast(float, data.attrib.get('audienceRating'))
         self.collections = self.findItems(data, media.Collection)
         self.formats = self.findItems(data, media.Format)
         self.genres = self.findItems(data, media.Genre)
@@ -426,6 +432,7 @@ class Track(
         Attributes:
             TAG (str): 'Directory'
             TYPE (str): 'track'
+            audienceRating (float): Audience rating.
             chapters (List<:class:`~plexapi.media.Chapter`>): List of Chapter objects.
             chapterSource (str): Unknown
             collections (List<:class:`~plexapi.media.Collection`>): List of collection objects.
@@ -451,6 +458,7 @@ class Track(
             parentThumb (str): URL to album thumbnail image (/library/metadata/<parentRatingKey>/thumb/<thumbid>).
             parentTitle (str): Name of the album for the track.
             primaryExtraKey (str) API URL for the primary extra for the track.
+            rating (float): Track rating (7.9; 9.8; 8.1).
             ratingCount (int): Number of listeners who have scrobbled this track, as reported by Last.fm.
             skipCount (int): Number of times the track has been skipped.
             sourceURI (str): Remote server URI (server://<machineIdentifier>/com.plexapp.plugins.library)
@@ -465,6 +473,7 @@ class Track(
         """ Load attribute values from Plex XML response. """
         Audio._loadData(self, data)
         Playable._loadData(self, data)
+        self.audienceRating = utils.cast(float, data.attrib.get('audienceRating'))
         self.chapters = self.findItems(data, media.Chapter)
         self.chapterSource = data.attrib.get('chapterSource')
         self.collections = self.findItems(data, media.Collection)
@@ -488,6 +497,7 @@ class Track(
         self.parentThumb = data.attrib.get('parentThumb')
         self.parentTitle = data.attrib.get('parentTitle')
         self.primaryExtraKey = data.attrib.get('primaryExtraKey')
+        self.rating = utils.cast(float, data.attrib.get('rating'))
         self.ratingCount = utils.cast(int, data.attrib.get('ratingCount'))
         self.skipCount = utils.cast(int, data.attrib.get('skipCount'))
         self.sourceURI = data.attrib.get('source')  # remote playlist item
diff --git a/lib/plexapi/base.py b/lib/plexapi/base.py
index c08334f9..9c735373 100644
--- a/lib/plexapi/base.py
+++ b/lib/plexapi/base.py
@@ -253,7 +253,7 @@ class PlexObject:
 
                     fetchItem(ekey, viewCount__gte=0)
                     fetchItem(ekey, Media__container__in=["mp4", "mkv"])
-                    fetchItem(ekey, guid__regex=r"com\\.plexapp\\.agents\\.(imdb|themoviedb)://|tt\d+")
+                    fetchItem(ekey, guid__regex=r"com\\.plexapp\\.agents\\.(imdb|themoviedb)://|tt\\d+")
                     fetchItem(ekey, guid__id__regex=r"(imdb|tmdb|tvdb)://")
                     fetchItem(ekey, Media__Part__file__startswith="D:\\Movies")
 
diff --git a/lib/plexapi/collection.py b/lib/plexapi/collection.py
index 5f591a4a..d71ddf2f 100644
--- a/lib/plexapi/collection.py
+++ b/lib/plexapi/collection.py
@@ -29,6 +29,7 @@ class Collection(
             addedAt (datetime): Datetime the collection was added to the library.
             art (str): URL to artwork image (/library/metadata/<ratingKey>/art/<artid>).
             artBlurHash (str): BlurHash string for artwork image.
+            audienceRating (float): Audience rating.
             childCount (int): Number of items in the collection.
             collectionFilterBasedOnUser (int): Which user's activity is used for the collection filtering.
             collectionMode (int): How the items in the collection are displayed.
@@ -47,6 +48,7 @@ class Collection(
             librarySectionTitle (str): :class:`~plexapi.library.LibrarySection` title.
             maxYear (int): Maximum year for the items in the collection.
             minYear (int): Minimum year for the items in the collection.
+            rating (float): Collection rating (7.9; 9.8; 8.1).
             ratingCount (int): The number of ratings.
             ratingKey (int): Unique key identifying the collection.
             smart (bool): True if the collection is a smart collection.
@@ -69,6 +71,7 @@ class Collection(
         self.addedAt = utils.toDatetime(data.attrib.get('addedAt'))
         self.art = data.attrib.get('art')
         self.artBlurHash = data.attrib.get('artBlurHash')
+        self.audienceRating = utils.cast(float, data.attrib.get('audienceRating'))
         self.childCount = utils.cast(int, data.attrib.get('childCount'))
         self.collectionFilterBasedOnUser = utils.cast(int, data.attrib.get('collectionFilterBasedOnUser', '0'))
         self.collectionMode = utils.cast(int, data.attrib.get('collectionMode', '-1'))
@@ -87,6 +90,7 @@ class Collection(
         self.librarySectionTitle = data.attrib.get('librarySectionTitle')
         self.maxYear = utils.cast(int, data.attrib.get('maxYear'))
         self.minYear = utils.cast(int, data.attrib.get('minYear'))
+        self.rating = utils.cast(float, data.attrib.get('rating'))
         self.ratingCount = utils.cast(int, data.attrib.get('ratingCount'))
         self.ratingKey = utils.cast(int, data.attrib.get('ratingKey'))
         self.smart = utils.cast(bool, data.attrib.get('smart', '0'))
diff --git a/lib/plexapi/const.py b/lib/plexapi/const.py
index c987e305..7568344e 100644
--- a/lib/plexapi/const.py
+++ b/lib/plexapi/const.py
@@ -4,6 +4,6 @@
 # Library version
 MAJOR_VERSION = 4
 MINOR_VERSION = 15
-PATCH_VERSION = 12
+PATCH_VERSION = 13
 __short_version__ = f"{MAJOR_VERSION}.{MINOR_VERSION}"
 __version__ = f"{__short_version__}.{PATCH_VERSION}"
diff --git a/lib/plexapi/library.py b/lib/plexapi/library.py
index 662b5462..f1bf5375 100644
--- a/lib/plexapi/library.py
+++ b/lib/plexapi/library.py
@@ -226,7 +226,7 @@ class Library(PlexObject):
             section.deleteMediaPreviews()
         return self
 
-    def add(self, name='', type='', agent='', scanner='', location='', language='en', *args, **kwargs):
+    def add(self, name='', type='', agent='', scanner='', location='', language='en-US', *args, **kwargs):
         """ Simplified add for the most common options.
 
             Parameters:
@@ -234,7 +234,7 @@ class Library(PlexObject):
                 agent (str): Example com.plexapp.agents.imdb
                 type (str): movie, show, # check me
                 location (str or list): /path/to/files, ["/path/to/files", "/path/to/morefiles"]
-                language (str): Two letter language fx en
+                language (str): Four letter language code (e.g. en-US)
                 kwargs (dict): Advanced options should be passed as a dict. where the id is the key.
 
             **Photo Preferences**
diff --git a/lib/plexapi/mixins.py b/lib/plexapi/mixins.py
index 60c24e26..8571ba63 100644
--- a/lib/plexapi/mixins.py
+++ b/lib/plexapi/mixins.py
@@ -567,6 +567,19 @@ class AddedAtMixin(EditFieldMixin):
         return self.editField('addedAt', addedAt, locked=locked)
 
 
+class AudienceRatingMixin(EditFieldMixin):
+    """ Mixin for Plex objects that can have an audience rating. """
+
+    def editAudienceRating(self, audienceRating, locked=True):
+        """ Edit the audience rating.
+
+            Parameters:
+                audienceRating (float): The new value.
+                locked (bool): True (default) to lock the field, False to unlock the field.
+        """
+        return self.editField('audienceRating', audienceRating, locked=locked)
+
+
 class ContentRatingMixin(EditFieldMixin):
     """ Mixin for Plex objects that can have a content rating. """
 
@@ -580,6 +593,19 @@ class ContentRatingMixin(EditFieldMixin):
         return self.editField('contentRating', contentRating, locked=locked)
 
 
+class CriticRatingMixin(EditFieldMixin):
+    """ Mixin for Plex objects that can have a critic rating. """
+
+    def editCriticRating(self, criticRating, locked=True):
+        """ Edit the critic rating.
+
+            Parameters:
+                criticRating (float): The new value.
+                locked (bool): True (default) to lock the field, False to unlock the field.
+        """
+        return self.editField('rating', criticRating, locked=locked)
+
+
 class EditionTitleMixin(EditFieldMixin):
     """ Mixin for Plex objects that can have an edition title. """
 
@@ -751,7 +777,7 @@ class UserRatingMixin(EditFieldMixin):
         """ Edit the user rating.
 
             Parameters:
-                userRating (int): The new value.
+                userRating (float): The new value.
                 locked (bool): True (default) to lock the field, False to unlock the field.
         """
         return self.editField('userRating', userRating, locked=locked)
@@ -1145,7 +1171,8 @@ class WatchlistMixin:
 
 class MovieEditMixins(
     ArtLockMixin, PosterLockMixin, ThemeLockMixin,
-    AddedAtMixin, ContentRatingMixin, EditionTitleMixin, OriginallyAvailableMixin, OriginalTitleMixin, SortTitleMixin,
+    AddedAtMixin, AudienceRatingMixin, ContentRatingMixin, CriticRatingMixin, EditionTitleMixin,
+    OriginallyAvailableMixin, OriginalTitleMixin, SortTitleMixin,
     StudioMixin, SummaryMixin, TaglineMixin, TitleMixin, UserRatingMixin,
     CollectionMixin, CountryMixin, DirectorMixin, GenreMixin, LabelMixin, ProducerMixin, WriterMixin
 ):
@@ -1154,7 +1181,8 @@ class MovieEditMixins(
 
 class ShowEditMixins(
     ArtLockMixin, PosterLockMixin, ThemeLockMixin,
-    AddedAtMixin, ContentRatingMixin, OriginallyAvailableMixin, OriginalTitleMixin, SortTitleMixin, StudioMixin,
+    AddedAtMixin, AudienceRatingMixin, ContentRatingMixin, CriticRatingMixin,
+    OriginallyAvailableMixin, OriginalTitleMixin, SortTitleMixin, StudioMixin,
     SummaryMixin, TaglineMixin, TitleMixin, UserRatingMixin,
     CollectionMixin, GenreMixin, LabelMixin,
 ):
@@ -1163,7 +1191,8 @@ class ShowEditMixins(
 
 class SeasonEditMixins(
     ArtLockMixin, PosterLockMixin, ThemeLockMixin,
-    AddedAtMixin, SummaryMixin, TitleMixin, UserRatingMixin,
+    AddedAtMixin, AudienceRatingMixin, CriticRatingMixin,
+    SummaryMixin, TitleMixin, UserRatingMixin,
     CollectionMixin, LabelMixin
 ):
     pass
@@ -1171,7 +1200,8 @@ class SeasonEditMixins(
 
 class EpisodeEditMixins(
     ArtLockMixin, PosterLockMixin, ThemeLockMixin,
-    AddedAtMixin, ContentRatingMixin, OriginallyAvailableMixin, SortTitleMixin, SummaryMixin, TitleMixin, UserRatingMixin,
+    AddedAtMixin, AudienceRatingMixin, ContentRatingMixin, CriticRatingMixin,
+    OriginallyAvailableMixin, SortTitleMixin, SummaryMixin, TitleMixin, UserRatingMixin,
     CollectionMixin, DirectorMixin, LabelMixin, WriterMixin
 ):
     pass
@@ -1179,7 +1209,8 @@ class EpisodeEditMixins(
 
 class ArtistEditMixins(
     ArtLockMixin, PosterLockMixin, ThemeLockMixin,
-    AddedAtMixin, SortTitleMixin, SummaryMixin, TitleMixin, UserRatingMixin,
+    AddedAtMixin, AudienceRatingMixin, CriticRatingMixin,
+    SortTitleMixin, SummaryMixin, TitleMixin, UserRatingMixin,
     CollectionMixin, CountryMixin, GenreMixin, LabelMixin, MoodMixin, SimilarArtistMixin, StyleMixin
 ):
     pass
@@ -1187,7 +1218,8 @@ class ArtistEditMixins(
 
 class AlbumEditMixins(
     ArtLockMixin, PosterLockMixin, ThemeLockMixin,
-    AddedAtMixin, OriginallyAvailableMixin, SortTitleMixin, StudioMixin, SummaryMixin, TitleMixin, UserRatingMixin,
+    AddedAtMixin, AudienceRatingMixin, CriticRatingMixin,
+    OriginallyAvailableMixin, SortTitleMixin, StudioMixin, SummaryMixin, TitleMixin, UserRatingMixin,
     CollectionMixin, GenreMixin, LabelMixin, MoodMixin, StyleMixin
 ):
     pass
@@ -1195,7 +1227,8 @@ class AlbumEditMixins(
 
 class TrackEditMixins(
     ArtLockMixin, PosterLockMixin, ThemeLockMixin,
-    AddedAtMixin, TitleMixin, TrackArtistMixin, TrackNumberMixin, TrackDiscNumberMixin, UserRatingMixin,
+    AddedAtMixin, AudienceRatingMixin, CriticRatingMixin,
+    TitleMixin, TrackArtistMixin, TrackNumberMixin, TrackDiscNumberMixin, UserRatingMixin,
     CollectionMixin, GenreMixin, LabelMixin, MoodMixin
 ):
     pass
@@ -1218,7 +1251,8 @@ class PhotoEditMixins(
 
 class CollectionEditMixins(
     ArtLockMixin, PosterLockMixin, ThemeLockMixin,
-    AddedAtMixin, ContentRatingMixin, SortTitleMixin, SummaryMixin, TitleMixin, UserRatingMixin,
+    AddedAtMixin, AudienceRatingMixin, ContentRatingMixin, CriticRatingMixin,
+    SortTitleMixin, SummaryMixin, TitleMixin, UserRatingMixin,
     LabelMixin
 ):
     pass
diff --git a/lib/plexapi/myplex.py b/lib/plexapi/myplex.py
index 8d697924..740b2398 100644
--- a/lib/plexapi/myplex.py
+++ b/lib/plexapi/myplex.py
@@ -99,7 +99,7 @@ class MyPlexAccount(PlexObject):
     EXISTINGUSER = 'https://plex.tv/api/home/users?invitedEmail={username}'                     # post with data
     FRIENDSERVERS = 'https://plex.tv/api/servers/{machineId}/shared_servers/{serverId}'         # put with data
     PLEXSERVERS = 'https://plex.tv/api/servers/{machineId}'                                     # get
-    FRIENDUPDATE = 'https://plex.tv/api/friends/{userId}'                                       # put with args, delete
+    FRIENDUPDATE = 'https://plex.tv/api/v2/sharings/{userId}'                                   # put with args, delete
     HOMEUSER = 'https://plex.tv/api/home/users/{userId}'                                        # delete, put
     MANAGEDHOMEUSER = 'https://plex.tv/api/v2/home/users/restricted/{userId}'                   # put
     SIGNIN = 'https://plex.tv/api/v2/users/signin'                                              # post with auth
diff --git a/lib/plexapi/playlist.py b/lib/plexapi/playlist.py
index a50b6200..dda3bdf5 100644
--- a/lib/plexapi/playlist.py
+++ b/lib/plexapi/playlist.py
@@ -1,5 +1,6 @@
 # -*- coding: utf-8 -*-
 import re
+from itertools import groupby
 from pathlib import Path
 from urllib.parse import quote_plus, unquote
 
@@ -212,19 +213,23 @@ class Playlist(
         if items and not isinstance(items, (list, tuple)):
             items = [items]
 
-        ratingKeys = []
-        for item in items:
-            if item.listType != self.playlistType:  # pragma: no cover
-                raise BadRequest(f'Can not mix media types when building a playlist: '
-                                 f'{self.playlistType} and {item.listType}')
-            ratingKeys.append(str(item.ratingKey))
+        # Group items by server to maintain order when adding items from multiple servers
+        for server, _items in groupby(items, key=lambda item: item._server):
 
-        ratingKeys = ','.join(ratingKeys)
-        uri = f'{self._server._uriRoot()}/library/metadata/{ratingKeys}'
+            ratingKeys = []
+            for item in _items:
+                if item.listType != self.playlistType:  # pragma: no cover
+                    raise BadRequest(f'Can not mix media types when building a playlist: '
+                                     f'{self.playlistType} and {item.listType}')
+                ratingKeys.append(str(item.ratingKey))
+
+            ratingKeys = ','.join(ratingKeys)
+            uri = f'{server._uriRoot()}/library/metadata/{ratingKeys}'
+
+            args = {'uri': uri}
+            key = f"{self.key}/items{utils.joinArgs(args)}"
+            self._server.query(key, method=self._server._session.put)
 
-        args = {'uri': uri}
-        key = f"{self.key}/items{utils.joinArgs(args)}"
-        self._server.query(key, method=self._server._session.put)
         return self
 
     @deprecated('use "removeItems" instead')
diff --git a/lib/plexapi/video.py b/lib/plexapi/video.py
index 727ba0f8..609f57f6 100644
--- a/lib/plexapi/video.py
+++ b/lib/plexapi/video.py
@@ -713,6 +713,7 @@ class Season(
         Attributes:
             TAG (str): 'Directory'
             TYPE (str): 'season'
+            audienceRating (float): Audience rating.
             audioLanguage (str): Setting that indicates the preferred audio language.
             collections (List<:class:`~plexapi.media.Collection`>): List of collection objects.
             guids (List<:class:`~plexapi.media.Guid`>): List of guid objects.
@@ -729,6 +730,7 @@ class Season(
             parentTheme (str): URL to show theme resource (/library/metadata/<parentRatingkey>/theme/<themeid>).
             parentThumb (str): URL to show thumbnail image (/library/metadata/<parentRatingKey>/thumb/<thumbid>).
             parentTitle (str): Name of the show for the season.
+            rating (float): Season rating (7.9; 9.8; 8.1).
             ratings (List<:class:`~plexapi.media.Rating`>): List of rating objects.
             subtitleLanguage (str): Setting that indicates the preferred subtitle language.
             subtitleMode (int): Setting that indicates the auto-select subtitle mode.
@@ -743,6 +745,7 @@ class Season(
     def _loadData(self, data):
         """ Load attribute values from Plex XML response. """
         Video._loadData(self, data)
+        self.audienceRating = utils.cast(float, data.attrib.get('audienceRating'))
         self.audioLanguage = data.attrib.get('audioLanguage', '')
         self.collections = self.findItems(data, media.Collection)
         self.guids = self.findItems(data, media.Guid)
@@ -759,6 +762,7 @@ class Season(
         self.parentTheme = data.attrib.get('parentTheme')
         self.parentThumb = data.attrib.get('parentThumb')
         self.parentTitle = data.attrib.get('parentTitle')
+        self.rating = utils.cast(float, data.attrib.get('rating'))
         self.ratings = self.findItems(data, media.Rating)
         self.subtitleLanguage = data.attrib.get('subtitleLanguage', '')
         self.subtitleMode = utils.cast(int, data.attrib.get('subtitleMode', '-1'))
diff --git a/requirements.txt b/requirements.txt
index 3d624c3a..6edced4e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -26,7 +26,7 @@ musicbrainzngs==0.7.1
 packaging==24.0
 paho-mqtt==2.1.0
 platformdirs==4.2.2
-plexapi==4.15.12
+plexapi==4.15.13
 portend==3.2.0
 profilehooks==1.12.0
 PyJWT==2.8.0