diff --git a/scraper/src/youtube2zim/schemas.py b/scraper/src/youtube2zim/schemas.py
index 3698cf1e..643f919f 100644
--- a/scraper/src/youtube2zim/schemas.py
+++ b/scraper/src/youtube2zim/schemas.py
@@ -74,6 +74,12 @@ class PlaylistPreview(CamelModel):
     count: int
 
 
+class Playlists(CamelModel):
+    """Class to serialize data about a list of YouTube playlists."""
+
+    playlists: list[PlaylistPreview]
+
+
 class Channel(CamelModel):
     """Class to serialize data about a YouTube channel."""
 
diff --git a/scraper/src/youtube2zim/scraper.py b/scraper/src/youtube2zim/scraper.py
index 29d8ed0e..49640b04 100644
--- a/scraper/src/youtube2zim/scraper.py
+++ b/scraper/src/youtube2zim/scraper.py
@@ -26,7 +26,6 @@
 from dateutil import parser as dt_parser
 from kiwixstorage import KiwixStorage
 from pif import get_public_ip
-from pydantic.json import pydantic_encoder
 from zimscraperlib.download import stream_file
 from zimscraperlib.fix_ogvjs_dist import fix_source_dir
 from zimscraperlib.i18n import NotFound, get_language_details, setlocale
@@ -61,6 +60,7 @@
     Channel,
     Playlist,
     PlaylistPreview,
+    Playlists,
     Subtitle,
     Video,
     VideoPreview,
@@ -1305,7 +1305,9 @@ def get_playlist_slug(playlist) -> str:
         self.zim_file.add_item_for(
             path="playlists.json",
             title="Playlists",
-            content=json.dumps(playlist_list, default=pydantic_encoder, indent=2),
+            content=Playlists(playlists=playlist_list).model_dump_json(
+                by_alias=True, indent=2
+            ),
             mimetype="application/json",
             is_front=False,
         )