diff --git a/Dockerfile b/Dockerfile
index 74275e7fe..b9771f756 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -11,13 +11,13 @@ FROM unit:php8.3 AS base
 RUN apt update && \
     apt upgrade -y && \
     apt install -y --no-install-recommends \
-    curl rsync imagemagick zip unzip libpq-dev libpng-dev libjpeg-dev libzip-dev libwebp-dev && \
+    curl rsync imagemagick zip unzip libpq-dev libpng-dev libjpeg-dev libzip-dev libwebp-dev libavif-dev && \
     rm -rf /var/lib/apt/lists/*
 RUN pecl install redis-6.1.0 && docker-php-ext-enable redis
 RUN pecl install apcu-5.1.24 && docker-php-ext-enable apcu
 RUN apt-get update && apt-get install -y libmemcached-dev libssl-dev zlib1g-dev && \
     pecl install memcached-3.3.0 && docker-php-ext-enable memcached
-RUN docker-php-ext-configure gd --with-jpeg --with-webp && \
+RUN docker-php-ext-configure gd --with-jpeg --with-webp --with-avif && \
     docker-php-ext-install gd
 RUN docker-php-ext-install mysqli pgsql pdo pdo_mysql pdo_pgsql zip pcntl
 
diff --git a/ext/handle_pixel/info.php b/ext/handle_pixel/info.php
index 2f79ad8e7..28e4c49db 100644
--- a/ext/handle_pixel/info.php
+++ b/ext/handle_pixel/info.php
@@ -13,6 +13,6 @@ class PixelFileHandlerInfo extends ExtensionInfo
     public string $url = self::SHIMMIE_URL;
     public array $authors = self::SHISH_AUTHOR;
     public ExtensionCategory $category = ExtensionCategory::FILE_HANDLING;
-    public string $description = "Handle JPEG, PNG, GIF, WEBP, etc files";
+    public string $description = "Handle JPEG, PNG, GIF, and similar files";
     public bool $core = true;
 }
diff --git a/ext/handle_pixel/main.php b/ext/handle_pixel/main.php
index 9c89e4d3d..decba730b 100644
--- a/ext/handle_pixel/main.php
+++ b/ext/handle_pixel/main.php
@@ -6,7 +6,13 @@
 
 class PixelFileHandler extends DataHandlerExtension
 {
-    protected array $SUPPORTED_MIME = [MimeType::JPEG, MimeType::GIF, MimeType::PNG, MimeType::WEBP];
+    protected array $SUPPORTED_MIME = [
+        MimeType::JPEG,
+        MimeType::GIF,
+        MimeType::PNG,
+        MimeType::WEBP,
+        MimeType::AVIF,
+    ];
 
     protected function media_check_properties(MediaCheckPropertiesEvent $event): void
     {
@@ -37,7 +43,7 @@ protected function media_check_properties(MediaCheckPropertiesEvent $event): voi
 
     protected function check_contents(string $tmpname): bool
     {
-        $valid = [IMAGETYPE_PNG, IMAGETYPE_GIF, IMAGETYPE_JPEG, IMAGETYPE_WEBP];
+        $valid = [IMAGETYPE_PNG, IMAGETYPE_GIF, IMAGETYPE_JPEG, IMAGETYPE_WEBP, IMAGETYPE_AVIF];
         $info = getimagesize($tmpname);
         return $info && in_array($info[2], $valid);
     }
diff --git a/ext/handle_pixel/test.php b/ext/handle_pixel/test.php
index 10366d31b..0d6b3fe17 100644
--- a/ext/handle_pixel/test.php
+++ b/ext/handle_pixel/test.php
@@ -29,6 +29,8 @@ public static function formatList(): array
             ["jpeg"],
             ["png"],
             ["gif"],
+            ["webp"],
+            ["avif"],
         ];
     }
 
diff --git a/ext/media/media_engine.php b/ext/media/media_engine.php
index 191d3259d..d3c64bed7 100644
--- a/ext/media/media_engine.php
+++ b/ext/media/media_engine.php
@@ -27,7 +27,8 @@ abstract class MediaEngine
             MimeType::GIF,
             MimeType::JPEG,
             MimeType::PNG,
-            MimeType::WEBP
+            MimeType::WEBP,
+            MimeType::AVIF,
         ],
         MediaEngine::IMAGICK => [
             MimeType::GIF,
@@ -35,6 +36,7 @@ abstract class MediaEngine
             MimeType::PNG,
             MimeType::WEBP,
             MimeType::WEBP_LOSSLESS,
+            MimeType::AVIF,
         ],
         MediaEngine::FFMPEG => [
             MimeType::JPEG,
@@ -54,6 +56,7 @@ abstract class MediaEngine
             MimeType::TGA,
             MimeType::WEBP,
             MimeType::WEBP_LOSSLESS,
+            MimeType::AVIF,
         ],
         MediaEngine::IMAGICK => [
             MimeType::BMP,
@@ -67,6 +70,7 @@ abstract class MediaEngine
             MimeType::WEBP,
             MimeType::WEBP_LOSSLESS,
             MimeType::ICO,
+            MimeType::AVIF,
         ],
         MediaEngine::FFMPEG => [
             MimeType::AVI,
@@ -80,6 +84,7 @@ abstract class MediaEngine
             MimeType::JPEG,
             MimeType::GIF,
             MimeType::PNG,
+            MimeType::AVIF,
         ],
     ];
     public const RESIZE_TYPE_SUPPORT = [
diff --git a/ext/mime/file_extension.php b/ext/mime/file_extension.php
index 2526939e7..3b714449d 100644
--- a/ext/mime/file_extension.php
+++ b/ext/mime/file_extension.php
@@ -11,6 +11,7 @@ class FileExtension
     public const ASF = 'asf';
     public const ASX = 'asx';
     public const AVI = 'avi';
+    public const AVIF = 'avif';
     public const BMP = 'bmp';
     public const BZIP = 'bz';
     public const BZIP2 = 'bz2';
diff --git a/ext/mime/mime_map.php b/ext/mime/mime_map.php
index 325869eb8..e342e13b7 100644
--- a/ext/mime/mime_map.php
+++ b/ext/mime/mime_map.php
@@ -28,6 +28,11 @@ class MimeMap
             self::MAP_EXT => [FileExtension::AVI],
             self::MAP_MIME => [MimeType::AVI, 'video/avi', 'video/msvideo'],
         ],
+        MimeType::AVIF => [
+            self::MAP_NAME => "AVIF",
+            self::MAP_EXT => [FileExtension::AVIF],
+            self::MAP_MIME => [MimeType::AVIF],
+        ],
         MimeType::ASF => [
             self::MAP_NAME => "ASF/WMV",
             self::MAP_EXT => [FileExtension::ASF, FileExtension::ASX, FileExtension::WMA, FileExtension::WMV],
diff --git a/ext/mime/mime_type.php b/ext/mime/mime_type.php
index ad7aba39b..bf178b3d5 100644
--- a/ext/mime/mime_type.php
+++ b/ext/mime/mime_type.php
@@ -12,6 +12,7 @@ class MimeType
     public const ANI = 'application/riff+ani';
     public const ASF = 'video/x-ms-asf';
     public const AVI = 'video/x-msvideo';
+    public const AVIF = 'image/avif';
     // Went with mime types from http://fileformats.archiveteam.org/wiki/Comic_Book_Archive
     public const COMIC_ZIP = 'application/vnd.comicbook+zip';
     public const COMIC_RAR = 'application/vnd.comicbook-rar';