diff --git a/extensions/horizon-dark-theme.yaml b/extensions/horizon-dark-theme.yaml
index a7e21e9..6dd1cb1 100644
--- a/extensions/horizon-dark-theme.yaml
+++ b/extensions/horizon-dark-theme.yaml
@@ -8,7 +8,7 @@ content_type: SN|Theme
 area: themes
 version: 1.0.0
 marketing_url: https://github.com/shouhu21/sn-theme-horizon-dark
-thumbnail_url: https://github.com/shouhu21/sn-theme-horizon-dark/blob/main/preview.png
+thumbnail_url: https://raw.githubusercontent.com/shouhu21/sn-theme-horizon-dark/main/preview.png
 description: Standard Notes theme based on colors from the Horizon theme for VSCode.
 
 statusBar: dark-content