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diff --git a/src/assets/shrines/cassettebeasts/images/cassettebeasts-website_screenshot_07.png b/src/assets/shrines/cassettebeasts/images/cassettebeasts-website_screenshot_07.png
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diff --git a/src/shrines/cassettebeasts.njk b/src/shrines/cassettebeasts.njk
index 424c241a..e56459b6 100644
--- a/src/shrines/cassettebeasts.njk
+++ b/src/shrines/cassettebeasts.njk
@@ -13,7 +13,7 @@ eleventyComputed:
 
 <section class="content__section">
     <h2>Welcome to My {% cite "Cassette Beasts" %} Shrine!</h2>
-    <img src="{{ imageAssetBaseUrl }}CassetteBeasts_keyart_16_9.png" alt="Promotional image of Cassette Beasts" loading="lazy">
+    <img src="{{ imageAssetBaseUrl }}CassetteBeasts_keyart_16_9.avif" alt="Promotional image of Cassette Beasts" loading="lazy">
     <p>{% cite "Cassette Beasts" %} is a 2D/3D hybrid monster collecting open-world role-playing video game developed by Bytten Studio, an indie team based in Brighton, United Kingdom, co-founded by Jay Baylis and Tom Coxon, and published by Raw Fury.</p>
 
     <p>First released on Steam and Windows on 26 April 2023, later on console on 25 May 2023, {% cite "Casette Beasts" %} is available on Windows, Linux, Steam, Xbox Series X|S, Xbox One, Gamepass and Nintendo Switch.</p>
@@ -32,7 +32,7 @@ eleventyComputed:
 <section class="content__section">
     <h2>Why You Should Play {% cite "Cassette Beasts" %}</h2>
 
-    <img src="{{ imageAssetBaseUrl }}cassettebeasts-website-header-bg.jpg" alt="Header of the Cassette Beasts official website" loading="lazy">
+    <img src="{{ imageAssetBaseUrl }}cassettebeasts-website-header-bg.avif" alt="Header of the Cassette Beasts official website" loading="lazy">
 
     <p>{% cite "Cassette Beasts" %} is a masterpiece of a monster collecting game with refreshing takes on the genre, from monster collecting mechanic, battle system, elemental type match ups, story, characters, lore, world building, map design, etc, with an amazing soundtrack that goes along with the game.</p>
 
@@ -46,7 +46,7 @@ eleventyComputed:
 <section class="content__section">
     <h2>My Interest In {% cite "Cassette Beasts" %}</h2>
 
-    <img src="{{ imageAssetBaseUrl }}cassettebeasts-website_screenshot_02.png" alt="Official screenshot of Harbourtown in Cassette Beasts" loading="lazy">
+    <img src="{{ imageAssetBaseUrl }}cassettebeasts-website_screenshot_02.avif" alt="Official screenshot of Harbourtown in Cassette Beasts" loading="lazy">
 
     <p>On 30 June 2023, when the Steam Summer Sale 2023 just started, I received {% cite "Cassette Beasts" %} as a Steam gift from a generous friend, who knew that I had been looking for independant monster collecting games, since I mostly play indie games instead of AAA games nowadays.</p>
 
@@ -64,7 +64,7 @@ eleventyComputed:
 <section class="content__section">
     <h2>My Contributions to the {% cite "Cassette Beasts" %} Community</h2>
 
-    <img src="{{ imageAssetBaseUrl }}cassettebeasts-website_screenshot_07.png" alt="Pre-release artwork of Kayleigh, Meredith and Eugene from Cassette Beasts" loading="lazy">
+    <img src="{{ imageAssetBaseUrl }}cassettebeasts-website_screenshot_07.avif" alt="Pre-release artwork of Kayleigh, Meredith and Eugene from Cassette Beasts" loading="lazy">
 
     <p>Since I got into {% cite "Cassette Beasts" %}, I have been making a great deal of effort in promoting the game online, by talking about and recommending the game on my online spaces, including this shrine on my website, as well as social media platforms such as Tumblr and Twitter.</p>
 
diff --git a/src/shrines/cassettebeasts/gamelog.md b/src/shrines/cassettebeasts/gamelog.md
index b76f10ba..3bc62070 100644
--- a/src/shrines/cassettebeasts/gamelog.md
+++ b/src/shrines/cassettebeasts/gamelog.md
@@ -17,7 +17,7 @@ eleventyNavigation:
 
 ## Character Profile: Kristine
 
-![Cassette Beasts screenshot of Kristine, a custom player character]({{universeAssetBase}}cb-character-kristine.png)
+![Cassette Beasts screenshot of Kristine, a custom player character]({{universeAssetBase}}cb-character-kristine.avif)
 
 My first and main character for Cassette Beasts. The first save file was created on 18 July 2023, and the main story was beaten on 30 July 2023. The second save file was created on 18 October 2023.