diff --git a/_includes/thumbnail_podcast.html b/_includes/thumbnail_podcast.html
index dff768c..3dd4622 100644
--- a/_includes/thumbnail_podcast.html
+++ b/_includes/thumbnail_podcast.html
@@ -7,7 +7,7 @@
         >
       {% else %}
         <img
-          src="{{ site.img_url }}thumbnails/podcast/{{ episode.custom_thumbnail_name }}.jpg"
+          src="{{ site.img_url }}thumbnails/podcast/{{ episode.custom_thumbnail_name }}.png"
           style="max-width: 365px; max-height: 223px;"
         >
       {% endif %}
diff --git a/assets/img/thumbnails/podcast/placeholder_S02.jpg b/assets/img/thumbnails/podcast/placeholder_S02.jpg
deleted file mode 100644
index 427c2c5..0000000
Binary files a/assets/img/thumbnails/podcast/placeholder_S02.jpg and /dev/null differ
diff --git a/assets/img/thumbnails/podcast/placeholder_S02.png b/assets/img/thumbnails/podcast/placeholder_S02.png
new file mode 100644
index 0000000..5008aa5
Binary files /dev/null and b/assets/img/thumbnails/podcast/placeholder_S02.png differ