diff --git a/web/changelogs/10.0.md b/web/changelogs/10.0.md
index 86da6d3b..5c627605 100644
--- a/web/changelogs/10.0.md
+++ b/web/changelogs/10.0.md
@@ -2,8 +2,8 @@
 title: "cobalt, reborn"
 date: "9 Sept, 2024"
 banner:
-    file: "cobalt10.png"
-    alt: "image of meowbalt smiling and loafing in front of a wall of text."
+    file: "cobalt10.webp"
+    alt: "image of a meowth plush staring into a screen with cobalt 10 ui shown."
 ---
 
 everything is new! this update marks the start of the latest chapter for cobalt. we spent the entire summer working hard to deliver the best experience ever, and we really hope you enjoy the rebirth of cobalt.
diff --git a/web/static/update-banners/cobalt10.png b/web/static/update-banners/cobalt10.png
deleted file mode 100644
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diff --git a/web/static/update-banners/cobalt10.webp b/web/static/update-banners/cobalt10.webp
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index 00000000..135c87d6
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