diff --git a/composer.json b/composer.json
index 56cfbcf4..d9459942 100644
--- a/composer.json
+++ b/composer.json
@@ -4,7 +4,7 @@
         "erusev/parsedown": "~1.6",
         "geoip2/geoip2": "~2.0",
         "jublonet/codebird-php": "^3.1",
-        "chillerlan/php-qrcode": "^3.0",
+        "chillerlan/php-qrcode": "^4.3",
         "whichbrowser/parser": "^2.0",
         "symfony/mailer": "^6.0"
     },
diff --git a/composer.lock b/composer.lock
index 9356e636..ca46250b 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,30 +4,30 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "4d6120e23f666aa6c5e45c2e2709199f",
+    "content-hash": "d3c39d122a38515484c9d439ecee240b",
     "packages": [
         {
             "name": "chillerlan/php-qrcode",
-            "version": "3.4.1",
+            "version": "4.3.3",
             "source": {
                 "type": "git",
                 "url": "https://github.com/chillerlan/php-qrcode.git",
-                "reference": "468603b687a5fe75c1ff33857a45f1726c7b95a9"
+                "reference": "6356b246948ac1025882b3f55e7c68ebd4515ae3"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/chillerlan/php-qrcode/zipball/468603b687a5fe75c1ff33857a45f1726c7b95a9",
-                "reference": "468603b687a5fe75c1ff33857a45f1726c7b95a9",
+                "url": "https://api.github.com/repos/chillerlan/php-qrcode/zipball/6356b246948ac1025882b3f55e7c68ebd4515ae3",
+                "reference": "6356b246948ac1025882b3f55e7c68ebd4515ae3",
                 "shasum": ""
             },
             "require": {
-                "chillerlan/php-settings-container": "^1.2.2",
+                "chillerlan/php-settings-container": "^2.1",
                 "ext-mbstring": "*",
-                "php": "^7.2 || ^8.0"
+                "php": "^7.4 || ^8.0"
             },
             "require-dev": {
-                "phan/phan": "^3.2.2",
-                "phpunit/phpunit": "^8.5",
+                "phan/phan": "^5.3",
+                "phpunit/phpunit": "^9.5",
                 "setasign/fpdf": "^1.8.2"
             },
             "suggest": {
@@ -59,7 +59,7 @@
                     "homepage": "https://github.com/chillerlan/php-qrcode/graphs/contributors"
                 }
             ],
-            "description": "A QR code generator. PHP 7.2+",
+            "description": "A QR code generator. PHP 7.4+",
             "homepage": "https://github.com/chillerlan/php-qrcode",
             "keywords": [
                 "phpqrcode",
@@ -70,7 +70,7 @@
             ],
             "support": {
                 "issues": "https://github.com/chillerlan/php-qrcode/issues",
-                "source": "https://github.com/chillerlan/php-qrcode/tree/3.4.1"
+                "source": "https://github.com/chillerlan/php-qrcode/tree/4.3.3"
             },
             "funding": [
                 {
@@ -82,28 +82,29 @@
                     "type": "ko_fi"
                 }
             ],
-            "time": "2021-09-03T17:54:45+00:00"
+            "time": "2021-11-25T22:38:09+00:00"
         },
         {
             "name": "chillerlan/php-settings-container",
-            "version": "1.2.2",
+            "version": "2.1.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/chillerlan/php-settings-container.git",
-                "reference": "d1b5284d6eb3a767459738bb0b20073f0cb3eeaf"
+                "reference": "ec834493a88682dd69652a1eeaf462789ed0c5f5"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/chillerlan/php-settings-container/zipball/d1b5284d6eb3a767459738bb0b20073f0cb3eeaf",
-                "reference": "d1b5284d6eb3a767459738bb0b20073f0cb3eeaf",
+                "url": "https://api.github.com/repos/chillerlan/php-settings-container/zipball/ec834493a88682dd69652a1eeaf462789ed0c5f5",
+                "reference": "ec834493a88682dd69652a1eeaf462789ed0c5f5",
                 "shasum": ""
             },
             "require": {
                 "ext-json": "*",
-                "php": "^7.2 || ^8.0"
+                "php": "^7.4 || ^8.0"
             },
             "require-dev": {
-                "phpunit/phpunit": "^8.4"
+                "phan/phan": "^4.0",
+                "phpunit/phpunit": "^9.5"
             },
             "type": "library",
             "autoload": {
@@ -122,7 +123,7 @@
                     "homepage": "https://github.com/codemasher"
                 }
             ],
-            "description": "A container class for immutable settings objects. Not a DI container. PHP 7.2+",
+            "description": "A container class for immutable settings objects. Not a DI container. PHP 7.4+",
             "homepage": "https://github.com/chillerlan/php-settings-container",
             "keywords": [
                 "PHP7",
@@ -144,7 +145,7 @@
                     "type": "ko_fi"
                 }
             ],
-            "time": "2021-09-03T17:33:25+00:00"
+            "time": "2021-09-06T15:17:01+00:00"
         },
         {
             "name": "composer/ca-bundle",
@@ -375,16 +376,16 @@
         },
         {
             "name": "doctrine/lexer",
-            "version": "1.2.2",
+            "version": "1.2.3",
             "source": {
                 "type": "git",
                 "url": "https://github.com/doctrine/lexer.git",
-                "reference": "9c50f840f257bbb941e6f4a0e94ccf5db5c3f76c"
+                "reference": "c268e882d4dbdd85e36e4ad69e02dc284f89d229"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/doctrine/lexer/zipball/9c50f840f257bbb941e6f4a0e94ccf5db5c3f76c",
-                "reference": "9c50f840f257bbb941e6f4a0e94ccf5db5c3f76c",
+                "url": "https://api.github.com/repos/doctrine/lexer/zipball/c268e882d4dbdd85e36e4ad69e02dc284f89d229",
+                "reference": "c268e882d4dbdd85e36e4ad69e02dc284f89d229",
                 "shasum": ""
             },
             "require": {
@@ -392,7 +393,7 @@
             },
             "require-dev": {
                 "doctrine/coding-standard": "^9.0",
-                "phpstan/phpstan": "1.3",
+                "phpstan/phpstan": "^1.3",
                 "phpunit/phpunit": "^7.5 || ^8.5 || ^9.5",
                 "vimeo/psalm": "^4.11"
             },
@@ -431,7 +432,7 @@
             ],
             "support": {
                 "issues": "https://github.com/doctrine/lexer/issues",
-                "source": "https://github.com/doctrine/lexer/tree/1.2.2"
+                "source": "https://github.com/doctrine/lexer/tree/1.2.3"
             },
             "funding": [
                 {
@@ -447,7 +448,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2022-01-12T08:27:12+00:00"
+            "time": "2022-02-28T11:07:21+00:00"
         },
         {
             "name": "egulias/email-validator",
@@ -1170,16 +1171,16 @@
         },
         {
             "name": "symfony/mailer",
-            "version": "v6.0.3",
+            "version": "v6.0.5",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/mailer.git",
-                "reference": "d958befe7dbee9d2b2157ef6dfa9b103efa94f82"
+                "reference": "0f4772db6521a1beb44529aa2c0c1e56f671be8f"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/mailer/zipball/d958befe7dbee9d2b2157ef6dfa9b103efa94f82",
-                "reference": "d958befe7dbee9d2b2157ef6dfa9b103efa94f82",
+                "url": "https://api.github.com/repos/symfony/mailer/zipball/0f4772db6521a1beb44529aa2c0c1e56f671be8f",
+                "reference": "0f4772db6521a1beb44529aa2c0c1e56f671be8f",
                 "shasum": ""
             },
             "require": {
@@ -1224,7 +1225,7 @@
             "description": "Helps sending emails",
             "homepage": "https://symfony.com",
             "support": {
-                "source": "https://github.com/symfony/mailer/tree/v6.0.3"
+                "source": "https://github.com/symfony/mailer/tree/v6.0.5"
             },
             "funding": [
                 {
@@ -1240,7 +1241,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2022-01-02T09:55:41+00:00"
+            "time": "2022-02-25T10:48:52+00:00"
         },
         {
             "name": "symfony/mime",
@@ -1357,12 +1358,12 @@
                 }
             },
             "autoload": {
-                "psr-4": {
-                    "Symfony\\Polyfill\\Ctype\\": ""
-                },
                 "files": [
                     "bootstrap.php"
-                ]
+                ],
+                "psr-4": {
+                    "Symfony\\Polyfill\\Ctype\\": ""
+                }
             },
             "notification-url": "https://packagist.org/downloads/",
             "license": [
diff --git a/public/proxy.php b/public/proxy.php
index 8962a20c..84ee9155 100644
--- a/public/proxy.php
+++ b/public/proxy.php
@@ -1,6 +1,8 @@
 <?php
 namespace Misuzu;
 
+use Index\Serialisation\Serialiser;
+
 require_once '../misuzu.php';
 
 $acceptedProtocols = ['http', 'https'];
@@ -24,7 +26,7 @@ if(empty($proxyHash) || empty($proxyUrl)) {
     return;
 }
 
-$proxyUrlDecoded = Base64::decode($proxyUrl, true);
+$proxyUrlDecoded = Serialiser::uriBase64()->deserialise($proxyUrl, true);
 $parsedUrl = parse_url($proxyUrlDecoded);
 
 if(empty($parsedUrl['scheme'])
diff --git a/src/AuthToken.php b/src/AuthToken.php
index a4b0820d..785b9d22 100644
--- a/src/AuthToken.php
+++ b/src/AuthToken.php
@@ -3,6 +3,7 @@ namespace Misuzu;
 
 use Misuzu\Users\User;
 use Misuzu\Users\UserSession;
+use Index\Serialisation\Serialiser;
 
 class AuthToken {
     public const VERSION = 1;
@@ -60,7 +61,7 @@ class AuthToken {
     public function pack(bool $base64 = true): string {
         $packed = pack('CNH*', self::VERSION, $this->getUserId(), $this->getSessionToken());
         if($base64)
-            $packed = Base64::encode($packed, true);
+            $packed = Serialiser::uriBase64()->serialise($packed);
         return $packed;
     }
 
@@ -70,7 +71,7 @@ class AuthToken {
         if(empty($data))
             return $obj;
         if($base64)
-            $data = Base64::decode($data, true);
+            $data = Serialiser::uriBase64()->deserialise($data);
 
         $data = str_pad($data, self::WIDTH, "\x00");
         $data = unpack('Cversion/Nuser/H*token', $data);
diff --git a/src/Base32.php b/src/Base32.php
deleted file mode 100644
index 73f67939..00000000
--- a/src/Base32.php
+++ /dev/null
@@ -1,41 +0,0 @@
-<?php
-namespace Misuzu;
-
-final class Base32 {
-    public const CHARS = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ234567';
-
-    public static function decode(string $str): string {
-        $out = '';
-        $length = strlen($str);
-        $char = $shift = 0;
-
-        for($i = 0; $i < $length; $i++) {
-            $char <<= 5;
-            $char += stripos(self::CHARS, $str[$i]);
-            $shift = ($shift + 5) % 8;
-            $out .= $shift < 5 ? chr(($char & (0xFF << $shift)) >> $shift) : '';
-        }
-
-        return $out;
-    }
-
-    public static function encode(string $data): string {
-        $bin = '';
-        $encoded = '';
-        $length = strlen($data);
-
-        for($i = 0; $i < $length; $i++) {
-            $bin .= sprintf('%08b', ord($data[$i]));
-        }
-
-        $bin = str_split($bin, 5);
-        $last = array_pop($bin);
-        $bin[] = str_pad($last, 5, '0', STR_PAD_RIGHT);
-
-        foreach($bin as $part) {
-            $encoded .= self::CHARS[bindec($part)];
-        }
-
-        return $encoded;
-    }
-}
diff --git a/src/Base64.php b/src/Base64.php
deleted file mode 100644
index 406668a6..00000000
--- a/src/Base64.php
+++ /dev/null
@@ -1,28 +0,0 @@
-<?php
-namespace Misuzu;
-
-final class Base64 {
-    public static function encode(string $data, bool $url = false): string {
-        $data = base64_encode($data);
-
-        if($url)
-            $data = rtrim(strtr($data, '+/', '-_'), '=');
-
-        return $data;
-    }
-
-    public static function decode(string $data, bool $url = false): string {
-        if($url)
-            $data = str_pad(strtr($data, '-_', '+/'), strlen($data) % 4, '=', STR_PAD_RIGHT);
-
-        return base64_decode($data);
-    }
-
-    public static function jsonEncode($data): string {
-        return self::encode(json_encode($data), true);
-    }
-
-    public static function jsonDecode(string $data) {
-        return json_decode(self::decode($data, true));
-    }
-}
diff --git a/src/Debug/Stopwatch.php b/src/Debug/Stopwatch.php
deleted file mode 100644
index 29a9d669..00000000
--- a/src/Debug/Stopwatch.php
+++ /dev/null
@@ -1,63 +0,0 @@
-<?php
-namespace Misuzu\Debug;
-
-final class Stopwatch {
-    private $startTime = 0;
-    private $stopTime = 0;
-    private $laps = [];
-
-    private static $instance = null;
-
-    public function __call(string $name, array $args) {
-        if($name[0] === '_')
-            return null;
-        return $this->{'_' . $name}(...$args);
-    }
-
-    public static function __callStatic(string $name, array $args) {
-        if($name[0] === '_')
-            return null;
-        if(self::$instance === null)
-            self::$instance = new static;
-        return self::$instance->{'_' . $name}(...$args);
-    }
-
-    private static function time() {
-        return microtime(true);
-    }
-
-    public function _start(): void {
-        $this->startTime = self::time();
-    }
-
-    public function _lap(string $text): void {
-        $this->laps[$text] = self::time();
-    }
-
-    public function _stop(): void {
-        $this->stopTime = self::time();
-    }
-
-    public function _reset(): void {
-        $this->laps = [];
-        $this->startTime = 0;
-        $this->stopTime = 0;
-    }
-
-    public function _elapsed(): float {
-        return $this->stopTime - $this->startTime;
-    }
-
-    public function _laps(): array {
-        $laps = [];
-        foreach($this->laps as $name => $time)
-            $laps[$name] = $time - $this->startTime;
-        return $laps;
-    }
-
-    public function _dump(bool $trimmed = false): void {
-        header('X-Misuzu-Elapsed: ' . $this->_elapsed());
-        foreach($this->_laps() as $text => $time)
-            header('X-Misuzu-Lap: ' . ($trimmed ? number_format($time, 6) : $time) . ' ' . $text, false);
-    }
-}
diff --git a/src/HasQualityInterface.php b/src/HasQualityInterface.php
deleted file mode 100644
index c83c8a93..00000000
--- a/src/HasQualityInterface.php
+++ /dev/null
@@ -1,6 +0,0 @@
-<?php
-namespace Misuzu;
-
-interface HasQualityInterface {
-    public function getQuality(): float;
-}
diff --git a/src/Http/Handlers/SockChatHandler.php b/src/Http/Handlers/SockChatHandler.php
index 27c624a5..e5d817f6 100644
--- a/src/Http/Handlers/SockChatHandler.php
+++ b/src/Http/Handlers/SockChatHandler.php
@@ -2,7 +2,6 @@
 namespace Misuzu\Http\Handlers;
 
 use Misuzu\AuthToken;
-use Misuzu\Base64;
 use Misuzu\Config;
 use Misuzu\DB;
 use Misuzu\Emoticon;
diff --git a/src/MediaType.php b/src/MediaType.php
deleted file mode 100644
index f3a71f1e..00000000
--- a/src/MediaType.php
+++ /dev/null
@@ -1,99 +0,0 @@
-<?php
-namespace Misuzu;
-
-use InvalidArgumentException;
-
-class MediaType implements HasQualityInterface {
-    private $type = '';
-    private $subtype = '';
-    private $suffix = '';
-    private $params = [];
-
-    public function __construct(string $mediaType) {
-        if(preg_match('#^([A-Za-z0-9\!\#\$%&\'\*\+\.\-_\{\}\|]+)/([A-Za-z0-9\!\#\$%&\'\*\+\.\-_\{\}\|]+)(?: ?; ?([A-Za-z0-9\!\#\$%&\'\*\+\.\-_\{\}\|\=; ]+))?$#', $mediaType, $matches) !== 1)
-            throw new InvalidArgumentException('Invalid media type supplied.');
-
-        $this->type = $matches[1];
-
-        $subTypeSplit = explode('+', $matches[2], 2);
-        $this->subtype = $subTypeSplit[0];
-        if(isset($subTypeSplit[1]))
-            $this->suffix = $subTypeSplit[1];
-
-        if(isset($matches[3])) {
-            $params = explode(';', $matches[3]);
-            foreach($params as $param) {
-                $parts = explode('=', trim($param), 2);
-                if(!isset($parts[1]))
-                    continue;
-                $this->params[$parts[0]] = $parts[1];
-            }
-        }
-    }
-
-    public function getType(): string {
-        return $this->type;
-    }
-
-    public function getSubtype(): string {
-        return $this->subtype;
-    }
-
-    public function getSuffix(): string {
-        return $this->subtype;
-    }
-
-    public function getParams(): array {
-        return $this->params;
-    }
-    public function getParam(string $name, int $filter = FILTER_DEFAULT, $options = 0) {
-        if(!isset($this->params[$name]))
-            return null;
-        return filter_var($this->params[$name], $filter, $options);
-    }
-
-    public function getCharset(): string {
-        return $this->getParam('charset') ?? 'utf-8';
-    }
-    public function getQuality(): float {
-        return max(min(round($this->getParam('q') ?? 1, 2), 1), 0);
-    }
-
-    public function match($other): bool {
-        if(is_string($other))
-            return $this->matchPattern($other);
-        if($other instanceof self)
-            return $this->matchType($other);
-        return false;
-    }
-    public function matchPattern(string $pattern): bool {
-        try {
-            $mediaType = new MediaType($pattern);
-        } catch(InvalidArgumentException $ex) {
-            return false;
-        }
-        return $this->matchType($mediaType);
-    }
-    public function matchType(MediaType $other): bool {
-        return ($other->getType() === '*' && $other->getSubtype() === '*')
-            || (
-                ($other->getType() === $this->getType())
-                && ($other->getSubtype() === '*' || $other->getSubtype() === $this->getSubtype())
-            );
-    }
-
-    public function __toString() {
-        $string = $this->type . '/';
-        $string .= $this->subtype;
-        if(!empty($this->suffix))
-            $string .= '+' . $this->suffix;
-        if(!empty($this->params))
-            foreach($this->params as $key => $value) {
-                $string .= ';';
-                if(!empty($key))
-                    $string .= $key . '=';
-                $string .= $value;
-            }
-        return $string;
-    }
-}
diff --git a/src/TOTP.php b/src/TOTP.php
index ccf9fef8..23971f9d 100644
--- a/src/TOTP.php
+++ b/src/TOTP.php
@@ -1,6 +1,8 @@
 <?php
 namespace Misuzu;
 
+use Index\Serialisation\Serialiser;
+
 class TOTP {
     public const DIGITS = 6;
     public const INTERVAL = 30;
@@ -13,7 +15,7 @@ class TOTP {
     }
 
     public static function generateKey(): string {
-        return Base32::encode(random_bytes(16));
+        return Serialiser::base32()->serialise(random_bytes(16));
     }
 
     public static function timecode(?int $timestamp = null, int $interval = self::INTERVAL): int {
@@ -22,7 +24,7 @@ class TOTP {
     }
 
     public function generate(?int $timestamp = null): string {
-        $hash = hash_hmac(self::HASH_ALGO, pack('J', self::timecode($timestamp)), Base32::decode($this->secretKey), true);
+        $hash = hash_hmac(self::HASH_ALGO, pack('J', self::timecode($timestamp)), Serialiser::base32()->deserialise($this->secretKey), true);
         $offset = ord($hash[strlen($hash) - 1]) & 0x0F;
 
         $bin = 0;
diff --git a/src/url.php b/src/url.php
index 44be4a1d..04b2eafb 100644
--- a/src/url.php
+++ b/src/url.php
@@ -252,7 +252,7 @@ function url_proxy_media(?string $url): ?string {
     }
 
     $secret = \Misuzu\Config::get('media_proxy.secret', \Misuzu\Config::TYPE_STR, 'insecure');
-    $url = \Misuzu\Base64::encode($url, true);
+    $url = \Index\Serialisation\Serialiser::uriBase64()->serialise($url);
     $hash = hash_hmac('sha256', $url, $secret);
 
     return url('media-proxy', compact('hash', 'url'));