diff --git a/py/manager.py b/py/manager.py
index a4642cb..9fe8b6d 100644
--- a/py/manager.py
+++ b/py/manager.py
@@ -144,7 +144,7 @@ class ModelManager:
                 preview_videos = utils.get_model_all_videos(entry.path)
                 if len(preview_videos) > 0:
                     preview_type = "video"
-                    preview_ext = f".{preview_videos[0].split(".")[-1]}"
+                    preview_ext = f".{preview_videos[0].split('.')[-1]}"
 
             model_preview = f"/model-manager/preview/{folder}/{path_index}/{relative_path.replace(extension, preview_ext)}"
 
diff --git a/pyproject.toml b/pyproject.toml
index 86d0f53..cffae8a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,7 +1,7 @@
 [project]
 name = "comfyui-model-manager"
 description = "Manage models: browsing, download and delete."
-version = "2.5.2"
+version = "2.5.3"
 license = { file = "LICENSE" }
 dependencies = ["markdownify"]