diff --git a/composer.json b/composer.json
index 7da855f85..e576d268a 100644
--- a/composer.json
+++ b/composer.json
@@ -4,7 +4,7 @@
   "type": "project",
   "license": "AGPL-3.0-only",
   "require": {
-    "php": ">=8.1.0 <8.2.0",
+    "php": ">=8.1.0 <8.4.0",
     "ext-ctype": "*",
     "ext-dom": "*",
     "ext-gd": "*",
@@ -23,7 +23,7 @@
     "pear/archive_tar": "~1.4.14",
     "pelago/emogrifier": "^7.2.0",
     "psr/log": "^3.0.0",
-    "scssphp/scssphp": "^1.10.3",
+    "scssphp/scssphp": "^1.12.1",
     "symfony/console": "~6.4.0",
     "symfony/dotenv": "~6.4.0",
     "symfony/framework-bundle": "~6.4.0",
diff --git a/composer.lock b/composer.lock
index ba67be268..cfbf5130a 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "ad8759a06560693a5072a1cf4c7738a2",
+    "content-hash": "3959316b7b3e78409779d7bd4d2f225f",
     "packages": [
         {
             "name": "apereo/phpcas",
@@ -1974,16 +1974,16 @@
         },
         {
             "name": "scssphp/scssphp",
-            "version": "v1.10.5",
+            "version": "v1.12.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/scssphp/scssphp.git",
-                "reference": "6d44282ccf283e133ab70b6282f8e068ff2f9bf9"
+                "reference": "394ed1e960138710a60d035c1a85d43d0bf0faeb"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/scssphp/scssphp/zipball/6d44282ccf283e133ab70b6282f8e068ff2f9bf9",
-                "reference": "6d44282ccf283e133ab70b6282f8e068ff2f9bf9",
+                "url": "https://api.github.com/repos/scssphp/scssphp/zipball/394ed1e960138710a60d035c1a85d43d0bf0faeb",
+                "reference": "394ed1e960138710a60d035c1a85d43d0bf0faeb",
                 "shasum": ""
             },
             "require": {
@@ -2000,7 +2000,7 @@
                 "thoughtbot/bourbon": "^7.0",
                 "twbs/bootstrap": "~5.0",
                 "twbs/bootstrap4": "4.6.1",
-                "zurb/foundation": "~6.5"
+                "zurb/foundation": "~6.7.0"
             },
             "suggest": {
                 "ext-iconv": "Can be used as fallback when ext-mbstring is not available",
@@ -2048,9 +2048,9 @@
             ],
             "support": {
                 "issues": "https://github.com/scssphp/scssphp/issues",
-                "source": "https://github.com/scssphp/scssphp/tree/v1.10.5"
+                "source": "https://github.com/scssphp/scssphp/tree/v1.12.1"
             },
-            "time": "2022-07-27T15:52:39+00:00"
+            "time": "2024-01-13T12:36:40+00:00"
         },
         {
             "name": "symfony/cache",
diff --git a/core/action.class.inc.php b/core/action.class.inc.php
index 4777a0925..10660003a 100644
--- a/core/action.class.inc.php
+++ b/core/action.class.inc.php
@@ -369,7 +369,7 @@ class ActionEmail extends ActionNotification
 	protected function FindRecipients($sRecipAttCode, $aArgs)
 	{
 		$sOQL = $this->Get($sRecipAttCode);
-		if (strlen($sOQL) === 0) return '';
+		if (utils::IsNullOrEmptyString($sOQL)) return '';
 
 		try
 		{
@@ -413,7 +413,7 @@ class ActionEmail extends ActionNotification
 		while ($oObj = $oSet->Fetch())
 		{
 			$sAddress = trim($oObj->Get($sEmailAttCode));
-			if (strlen($sAddress) > 0)
+			if (utils::IsNotNullOrEmptyString($sAddress))
 			{
 				$aRecipients[] = $sAddress;
 				$this->m_iRecipients++;
diff --git a/lib/bin/pscss b/lib/bin/pscss
index fa9a900db..e57bed8fc 100644
--- a/lib/bin/pscss
+++ b/lib/bin/pscss
@@ -4,15 +4,16 @@
 /**
  * Proxy PHP file generated by Composer
  *
- * This file includes the referenced bin path (../scssphp/scssphp/bin/pscss) using ob_start to remove the shebang if present
- * to prevent the shebang from being output on PHP<8
+ * This file includes the referenced bin path (../scssphp/scssphp/bin/pscss)
+ * using a stream wrapper to prevent the shebang from being output on PHP<8
  *
  * @generated
  */
 
 namespace Composer;
 
-$binPath = __DIR__ . "/" . '../scssphp/scssphp/bin/pscss';
+$GLOBALS['_composer_bin_dir'] = __DIR__;
+$GLOBALS['_composer_autoload_path'] = __DIR__ . '/..'.'/autoload.php';
 
 if (PHP_VERSION_ID < 80000) {
     if (!class_exists('Composer\BinProxyWrapper')) {
@@ -23,18 +24,17 @@ if (PHP_VERSION_ID < 80000) {
         {
             private $handle;
             private $position;
+            private $realpath;
 
             public function stream_open($path, $mode, $options, &$opened_path)
             {
-                // get rid of composer-bin-proxy:// prefix for __FILE__ & __DIR__ resolution
-                $opened_path = substr($path, 21);
-                $opened_path = realpath($opened_path) ?: $opened_path;
-                $this->handle = fopen($opened_path, $mode);
+                // get rid of phpvfscomposer:// prefix for __FILE__ & __DIR__ resolution
+                $opened_path = substr($path, 17);
+                $this->realpath = realpath($opened_path) ?: $opened_path;
+                $opened_path = $this->realpath;
+                $this->handle = fopen($this->realpath, $mode);
                 $this->position = 0;
 
-                // remove all traces of this stream wrapper once it has been used
-                stream_wrapper_unregister('composer-bin-proxy');
-
                 return (bool) $this->handle;
             }
 
@@ -66,6 +66,16 @@ if (PHP_VERSION_ID < 80000) {
                 return $operation ? flock($this->handle, $operation) : true;
             }
 
+            public function stream_seek($offset, $whence)
+            {
+                if (0 === fseek($this->handle, $offset, $whence)) {
+                    $this->position = ftell($this->handle);
+                    return true;
+                }
+
+                return false;
+            }
+
             public function stream_tell()
             {
                 return $this->position;
@@ -78,20 +88,32 @@ if (PHP_VERSION_ID < 80000) {
 
             public function stream_stat()
             {
-                return fstat($this->handle);
+                return array();
             }
 
             public function stream_set_option($option, $arg1, $arg2)
             {
                 return true;
             }
+
+            public function url_stat($path, $flags)
+            {
+                $path = substr($path, 17);
+                if (file_exists($path)) {
+                    return stat($path);
+                }
+
+                return false;
+            }
         }
     }
 
-    if (function_exists('stream_wrapper_register') && stream_wrapper_register('composer-bin-proxy', 'Composer\BinProxyWrapper')) {
-        include("composer-bin-proxy://" . $binPath);
-        exit(0);
+    if (
+        (function_exists('stream_get_wrappers') && in_array('phpvfscomposer', stream_get_wrappers(), true))
+        || (function_exists('stream_wrapper_register') && stream_wrapper_register('phpvfscomposer', 'Composer\BinProxyWrapper'))
+    ) {
+        return include("phpvfscomposer://" . __DIR__ . '/..'.'/scssphp/scssphp/bin/pscss');
     }
 }
 
-include $binPath;
+return include __DIR__ . '/..'.'/scssphp/scssphp/bin/pscss';
diff --git a/lib/bin/pscss.bat b/lib/bin/pscss.bat
index 1e368dc92..6b83bf27c 100644
--- a/lib/bin/pscss.bat
+++ b/lib/bin/pscss.bat
@@ -1,4 +1,5 @@
 @ECHO OFF
 setlocal DISABLEDELAYEDEXPANSION
-SET BIN_TARGET=%~dp0/../scssphp/scssphp/bin/pscss
+SET BIN_TARGET=%~dp0/pscss
+SET COMPOSER_RUNTIME_BIN_DIR=%~dp0
 php "%BIN_TARGET%" %*
diff --git a/lib/composer/installed.json b/lib/composer/installed.json
index 1a0187ede..e13c89514 100644
--- a/lib/composer/installed.json
+++ b/lib/composer/installed.json
@@ -2058,17 +2058,17 @@
         },
         {
             "name": "scssphp/scssphp",
-            "version": "v1.10.5",
-            "version_normalized": "1.10.5.0",
+            "version": "v1.12.1",
+            "version_normalized": "1.12.1.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/scssphp/scssphp.git",
-                "reference": "6d44282ccf283e133ab70b6282f8e068ff2f9bf9"
+                "reference": "394ed1e960138710a60d035c1a85d43d0bf0faeb"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/scssphp/scssphp/zipball/6d44282ccf283e133ab70b6282f8e068ff2f9bf9",
-                "reference": "6d44282ccf283e133ab70b6282f8e068ff2f9bf9",
+                "url": "https://api.github.com/repos/scssphp/scssphp/zipball/394ed1e960138710a60d035c1a85d43d0bf0faeb",
+                "reference": "394ed1e960138710a60d035c1a85d43d0bf0faeb",
                 "shasum": ""
             },
             "require": {
@@ -2085,13 +2085,13 @@
                 "thoughtbot/bourbon": "^7.0",
                 "twbs/bootstrap": "~5.0",
                 "twbs/bootstrap4": "4.6.1",
-                "zurb/foundation": "~6.5"
+                "zurb/foundation": "~6.7.0"
             },
             "suggest": {
                 "ext-iconv": "Can be used as fallback when ext-mbstring is not available",
                 "ext-mbstring": "For best performance, mbstring should be installed as it is faster than ext-iconv"
             },
-            "time": "2022-07-27T15:52:39+00:00",
+            "time": "2024-01-13T12:36:40+00:00",
             "bin": [
                 "bin/pscss"
             ],
@@ -2135,7 +2135,7 @@
             ],
             "support": {
                 "issues": "https://github.com/scssphp/scssphp/issues",
-                "source": "https://github.com/scssphp/scssphp/tree/v1.10.5"
+                "source": "https://github.com/scssphp/scssphp/tree/v1.12.1"
             },
             "install-path": "../scssphp/scssphp"
         },
diff --git a/lib/composer/installed.php b/lib/composer/installed.php
index 1c7724926..e0eaac9a4 100644
--- a/lib/composer/installed.php
+++ b/lib/composer/installed.php
@@ -3,7 +3,7 @@
         'name' => 'combodo/itop',
         'pretty_version' => 'dev-develop',
         'version' => 'dev-develop',
-        'reference' => 'befb061f0ddb07527ed1d1fb0dde21e29428db75',
+        'reference' => '25c2e34eed5a10c142c237a61a06b6845bb9031c',
         'type' => 'project',
         'install_path' => __DIR__ . '/../../',
         'aliases' => array(),
@@ -22,7 +22,7 @@
         'combodo/itop' => array(
             'pretty_version' => 'dev-develop',
             'version' => 'dev-develop',
-            'reference' => 'befb061f0ddb07527ed1d1fb0dde21e29428db75',
+            'reference' => '25c2e34eed5a10c142c237a61a06b6845bb9031c',
             'type' => 'project',
             'install_path' => __DIR__ . '/../../',
             'aliases' => array(),
@@ -351,9 +351,9 @@
             'dev_requirement' => false,
         ),
         'scssphp/scssphp' => array(
-            'pretty_version' => 'v1.10.5',
-            'version' => '1.10.5.0',
-            'reference' => '6d44282ccf283e133ab70b6282f8e068ff2f9bf9',
+            'pretty_version' => 'v1.12.1',
+            'version' => '1.12.1.0',
+            'reference' => '394ed1e960138710a60d035c1a85d43d0bf0faeb',
             'type' => 'library',
             'install_path' => __DIR__ . '/../scssphp/scssphp',
             'aliases' => array(),
diff --git a/lib/scssphp/scssphp/composer.json b/lib/scssphp/scssphp/composer.json
index 269a4732f..d17ffb924 100644
--- a/lib/scssphp/scssphp/composer.json
+++ b/lib/scssphp/scssphp/composer.json
@@ -43,23 +43,23 @@
         "thoughtbot/bourbon": "^7.0",
         "twbs/bootstrap": "~5.0",
         "twbs/bootstrap4": "4.6.1",
-        "zurb/foundation": "~6.5"
+        "zurb/foundation": "~6.7.0"
     },
     "repositories": [
         {
             "type": "package",
             "package": {
                 "name": "sass/sass-spec",
-                "version": "2022.02.24",
+                "version": "2022.08.19",
                 "source": {
                     "type": "git",
                     "url": "https://github.com/sass/sass-spec.git",
-                    "reference": "f41b9bfb9a3013392f2136c79f7f3356f15fb8ba"
+                    "reference": "2bdc199723a3445d5badac3ac774105698f08861"
                 },
                 "dist": {
                     "type": "zip",
-                    "url": "https://api.github.com/repos/sass/sass-spec/zipball/f41b9bfb9a3013392f2136c79f7f3356f15fb8ba",
-                    "reference": "f41b9bfb9a3013392f2136c79f7f3356f15fb8ba",
+                    "url": "https://api.github.com/repos/sass/sass-spec/zipball/2bdc199723a3445d5badac3ac774105698f08861",
+                    "reference": "2bdc199723a3445d5badac3ac774105698f08861",
                     "shasum": ""
                 }
             }
diff --git a/lib/scssphp/scssphp/src/Block/CallableBlock.php b/lib/scssphp/scssphp/src/Block/CallableBlock.php
index a18a87c2a..9b32d8ce7 100644
--- a/lib/scssphp/scssphp/src/Block/CallableBlock.php
+++ b/lib/scssphp/scssphp/src/Block/CallableBlock.php
@@ -14,6 +14,7 @@ namespace ScssPhp\ScssPhp\Block;
 
 use ScssPhp\ScssPhp\Block;
 use ScssPhp\ScssPhp\Compiler\Environment;
+use ScssPhp\ScssPhp\Node\Number;
 
 /**
  * @internal
@@ -26,7 +27,7 @@ class CallableBlock extends Block
     public $name;
 
     /**
-     * @var array|null
+     * @var list<array{string, array|Number|null, bool}>|null
      */
     public $args;
 
diff --git a/lib/scssphp/scssphp/src/Compiler.php b/lib/scssphp/scssphp/src/Compiler.php
index e66cee3dc..d4e7c6896 100644
--- a/lib/scssphp/scssphp/src/Compiler.php
+++ b/lib/scssphp/scssphp/src/Compiler.php
@@ -458,10 +458,33 @@ class Compiler
     }
 
     /**
-     * Compile scss
+     * Compiles the provided scss file into CSS.
+     *
+     * @param string $path
+     *
+     * @return CompilationResult
+     *
+     * @throws SassException when the source fails to compile
+     */
+    public function compileFile($path)
+    {
+        $source = file_get_contents($path);
+
+        if ($source === false) {
+            throw new \RuntimeException('Could not read the file content');
+        }
+
+        return $this->compileString($source, $path);
+    }
+
+    /**
+     * Compiles the provided scss source code into CSS.
+     *
+     * If provided, the path is considered to be the path from which the source code comes
+     * from, which will be used to resolve relative imports.
      *
      * @param string      $source
-     * @param string|null $path
+     * @param string|null $path   The path for the source, used to resolve relative imports
      *
      * @return CompilationResult
      *
@@ -548,7 +571,7 @@ class Compiler
 
             $sourceMap = null;
 
-            if (! empty($out) && $this->sourceMap && $this->sourceMap !== self::SOURCE_MAP_NONE) {
+            if (! empty($out) && $this->sourceMap !== self::SOURCE_MAP_NONE && $this->sourceMap) {
                 assert($sourceMapGenerator !== null);
                 $sourceMap = $sourceMapGenerator->generateJson($prefix);
                 $sourceMapUrl = null;
@@ -1508,6 +1531,7 @@ class Compiler
         // start from the root
         while ($scope->parent && $scope->parent->type !== Type::T_ROOT) {
             array_unshift($childStash, $scope);
+            \assert($scope->parent !== null);
             $scope = $scope->parent;
         }
 
@@ -2090,6 +2114,11 @@ class Compiler
             foreach ($selector as $node) {
                 $compound = '';
 
+                if (!is_array($node)) {
+                    $output[] = $node;
+                    continue;
+                }
+
                 array_walk_recursive(
                     $node,
                     function ($value, $key) use (&$compound) {
@@ -2124,12 +2153,16 @@ class Compiler
             foreach ($selector as $node) {
                 $compound = '';
 
-                array_walk_recursive(
-                    $node,
-                    function ($value, $key) use (&$compound) {
-                        $compound .= $value;
-                    }
-                );
+                if (!is_array($node)) {
+                    $compound .= $node;
+                } else {
+                    array_walk_recursive(
+                        $node,
+                        function ($value, $key) use (&$compound) {
+                            $compound .= $value;
+                        }
+                    );
+                }
 
                 if ($this->isImmediateRelationshipCombinator($compound)) {
                     if (\count($output)) {
@@ -2885,7 +2918,7 @@ class Compiler
     {
         if (isset($child[Parser::SOURCE_LINE])) {
             $this->sourceIndex  = isset($child[Parser::SOURCE_INDEX]) ? $child[Parser::SOURCE_INDEX] : null;
-            $this->sourceLine   = isset($child[Parser::SOURCE_LINE]) ? $child[Parser::SOURCE_LINE] : -1;
+            $this->sourceLine   = $child[Parser::SOURCE_LINE];
             $this->sourceColumn = isset($child[Parser::SOURCE_COLUMN]) ? $child[Parser::SOURCE_COLUMN] : -1;
         } elseif (\is_array($child) && isset($child[1]->sourceLine) && $child[1] instanceof Block) {
             $this->sourceIndex  = $child[1]->sourceIndex;
@@ -4529,8 +4562,10 @@ EOL;
                             return $colorName;
                         }
 
-                        if (is_numeric($alpha)) {
+                        if (\is_int($alpha) || \is_float($alpha)) {
                             $a = new Number($alpha, '');
+                        } elseif (is_numeric($alpha)) {
+                            $a = new Number((float) $alpha, '');
                         } else {
                             $a = $alpha;
                         }
@@ -5806,13 +5841,13 @@ EOL;
 
                     if (! \is_null($file)) {
                         if (\is_array($dir)) {
-                            $callableDescription = (\is_object($dir[0]) ? \get_class($dir[0]) : $dir[0]).'::'.$dir[1];
+                            $callableDescription = (\is_object($dir[0]) ? \get_class($dir[0]) : $dir[0]) . '::' . $dir[1];
                         } elseif ($dir instanceof \Closure) {
                             $r = new \ReflectionFunction($dir);
                             if (false !== strpos($r->name, '{closure}')) {
                                 $callableDescription = sprintf('closure{%s:%s}', $r->getFileName(), $r->getStartLine());
                             } elseif ($class = $r->getClosureScopeClass()) {
-                                $callableDescription = $class->name.'::'.$r->name;
+                                $callableDescription = $class->name . '::' . $r->name;
                             } else {
                                 $callableDescription = $r->name;
                             }
@@ -5925,15 +5960,15 @@ EOL;
     private function tryImportPathWithExtensions($path)
     {
         $result = array_merge(
-            $this->tryImportPath($path.'.sass'),
-            $this->tryImportPath($path.'.scss')
+            $this->tryImportPath($path . '.sass'),
+            $this->tryImportPath($path . '.scss')
         );
 
         if ($result) {
             return $result;
         }
 
-        return $this->tryImportPath($path.'.css');
+        return $this->tryImportPath($path . '.css');
     }
 
     /**
@@ -5943,7 +5978,7 @@ EOL;
      */
     private function tryImportPath($path)
     {
-        $partial = dirname($path).'/_'.basename($path);
+        $partial = dirname($path) . '/_' . basename($path);
 
         $candidates = [];
 
@@ -5969,7 +6004,7 @@ EOL;
             return null;
         }
 
-        return $this->checkImportPathConflicts($this->tryImportPathWithExtensions($path.'/index'));
+        return $this->checkImportPathConflicts($this->tryImportPathWithExtensions($path . '/index'));
     }
 
     /**
@@ -5984,7 +6019,7 @@ EOL;
         }
 
         $normalizedPath = $path;
-        $normalizedRootDirectory = $this->rootDirectory.'/';
+        $normalizedRootDirectory = $this->rootDirectory . '/';
 
         if (\DIRECTORY_SEPARATOR === '\\') {
             $normalizedRootDirectory = str_replace('\\', '/', $normalizedRootDirectory);
@@ -6371,8 +6406,6 @@ EOL;
      */
     protected function sortNativeFunctionArgs($functionName, $prototypes, $args)
     {
-        static $parser = null;
-
         if (! isset($prototypes)) {
             $keyArgs = [];
             $posArgs = [];
@@ -6526,7 +6559,7 @@ EOL;
      *
      * @return array
      *
-     * @phpstan-param non-empty-list<array{arguments: list<array{0: string, 1: string, 2: array|Number|null}>, rest_argument: string|null}> $prototypes
+     * @phpstan-param non-empty-array<array{arguments: list<array{0: string, 1: string, 2: array|Number|null}>, rest_argument: string|null}> $prototypes
      * @phpstan-return array{arguments: list<array{0: string, 1: string, 2: array|Number|null}>, rest_argument: string|null}
      */
     private function selectFunctionPrototype(array $prototypes, $positional, array $names)
@@ -6984,10 +7017,14 @@ EOL;
             return static::$null;
         }
 
-        if (is_numeric($value)) {
+        if (\is_int($value) || \is_float($value)) {
             return new Number($value, '');
         }
 
+        if (is_numeric($value)) {
+            return new Number((float) $value, '');
+        }
+
         if ($value === '') {
             return static::$emptyString;
         }
@@ -7675,9 +7712,9 @@ EOL;
         $b = min(1.0 - $w, $b);
 
         $rgb = $this->toRGB($hue, 100, 50);
-        for($i = 1; $i < 4; $i++) {
-          $rgb[$i] *= (1.0 - $w - $b);
-          $rgb[$i] = round($rgb[$i] + 255 * $w + 0.0001);
+        for ($i = 1; $i < 4; $i++) {
+            $rgb[$i] *= (1.0 - $w - $b);
+            $rgb[$i] = round($rgb[$i] + 255 * $w + 0.0001);
         }
 
         return $rgb;
@@ -7704,7 +7741,6 @@ EOL;
         if ((int) $d === 0) {
             $h = 0;
         } else {
-
             if ($red == $max) {
                 $h = 60 * ($green - $blue) / $d;
             } elseif ($green == $max) {
@@ -7714,7 +7750,7 @@ EOL;
             }
         }
 
-        return [Type::T_HWB, fmod($h, 360), $min / 255 * 100, 100 - $max / 255 *100];
+        return [Type::T_HWB, fmod($h, 360), $min / 255 * 100, 100 - $max / 255 * 100];
     }
 
 
@@ -7923,7 +7959,13 @@ EOL;
         $scale = $operation === 'scale';
         $change = $operation === 'change';
 
-        /** @phpstan-var callable(string, float|int, bool=, bool=): (float|int|null) $getParam */
+        /**
+         * @param string $name
+         * @param float|int $max
+         * @param bool $checkPercent
+         * @param bool $assertPercent
+         * @return float|int|null
+         */
         $getParam = function ($name, $max, $checkPercent = false, $assertPercent = false) use (&$kwargs, $scale, $change) {
             if (!isset($kwargs[$name])) {
                 return null;
@@ -7947,7 +7989,11 @@ EOL;
                 $max = 100;
             }
 
-            return $number->valueInRange($change ? 0 : -$max, $max, $name);
+            if ($scale || $assertPercent) {
+                return $number->valueInRange($change ? 0 : -$max, $max, $name);
+            }
+
+            return $number->valueInRangeWithUnit($change ? 0 : -$max, $max, $name, $checkPercent ? '%' : '');
         };
 
         $alpha = $getParam('alpha', 1);
@@ -8061,7 +8107,7 @@ EOL;
     protected static $libChangeColor = ['color', 'kwargs...'];
     protected function libChangeColor($args)
     {
-        return $this->alterColor($args,'change', function ($base, $alter, $max) {
+        return $this->alterColor($args, 'change', function ($base, $alter, $max) {
             if ($alter === null) {
                 return $base;
             }
@@ -8582,7 +8628,7 @@ EOL;
         $color = $this->assertColor($args[0], 'color');
         $amount = $this->assertNumber($args[1], 'amount');
 
-        $color[4] = (isset($color[4]) ? $color[4] : 1) + $amount->valueInRange(0, 1, 'amount');
+        $color[4] = (isset($color[4]) ? $color[4] : 1) + $amount->valueInRangeWithUnit(0, 1, 'amount', '');
         $color[4] = min(1, max(0, $color[4]));
 
         return $color;
@@ -8601,7 +8647,7 @@ EOL;
         $color = $this->assertColor($args[0], 'color');
         $amount = $this->assertNumber($args[1], 'amount');
 
-        $color[4] = (isset($color[4]) ? $color[4] : 1) - $amount->valueInRange(0, 1, 'amount');
+        $color[4] = (isset($color[4]) ? $color[4] : 1) - $amount->valueInRangeWithUnit(0, 1, 'amount', '');
         $color[4] = min(1, max(0, $color[4]));
 
         return $color;
@@ -9589,7 +9635,25 @@ will be an error in future versions of Sass.\n         on line $line of $fname";
     protected function libRandom($args)
     {
         if (isset($args[0]) && $args[0] !== static::$null) {
-            $n = $this->assertInteger($args[0], 'limit');
+            $limit = $this->assertNumber($args[0], 'limit');
+
+            if ($limit->hasUnits()) {
+                $unitString = $limit->unitStr();
+                $message = <<<TXT
+random() will no longer ignore \$limit units ($limit) in a future release.
+
+Recommendation: random(\$limit / 1$unitString) * 1$unitString
+
+To preserve current behavior: random(\$limit / 1$unitString)
+
+More info: https://sass-lang.com/d/random-with-units
+
+TXT;
+
+                Warn::deprecation($this->addLocationToMessage($message));
+            }
+
+            $n = $this->assertInteger($limit, 'limit');
 
             if ($n < 1) {
                 throw new SassScriptException("\$limit: Must be greater than 0, was $n.");
diff --git a/lib/scssphp/scssphp/src/Node/Number.php b/lib/scssphp/scssphp/src/Node/Number.php
index ca9b5b652..6c0445876 100644
--- a/lib/scssphp/scssphp/src/Node/Number.php
+++ b/lib/scssphp/scssphp/src/Node/Number.php
@@ -33,7 +33,7 @@ use ScssPhp\ScssPhp\Util;
  *
  * @template-implements \ArrayAccess<int, mixed>
  */
-class Number extends Node implements \ArrayAccess
+class Number extends Node implements \ArrayAccess, \JsonSerializable
 {
     const PRECISION = 10;
 
@@ -131,7 +131,7 @@ class Number extends Node implements \ArrayAccess
     }
 
     /**
-     * @return string[]
+     * @return list<string>
      */
     public function getNumeratorUnits()
     {
@@ -139,13 +139,23 @@ class Number extends Node implements \ArrayAccess
     }
 
     /**
-     * @return string[]
+     * @return list<string>
      */
     public function getDenominatorUnits()
     {
         return $this->denominatorUnits;
     }
 
+    /**
+     * @return mixed
+     */
+    #[\ReturnTypeWillChange]
+    public function jsonSerialize()
+    {
+        // Passing a compiler instance makes the method output a Sass representation instead of a CSS one, supporting full units.
+        return $this->output(new Compiler());
+    }
+
     /**
      * @return bool
      */
@@ -227,6 +237,16 @@ class Number extends Node implements \ArrayAccess
         return \count($this->numeratorUnits) === 0 && \count($this->denominatorUnits) === 0;
     }
 
+    /**
+     * Returns true if the number has any units
+     *
+     * @return bool
+     */
+    public function hasUnits()
+    {
+        return !$this->unitless();
+    }
+
     /**
      * Checks whether the number has exactly this unit
      *
@@ -266,7 +286,27 @@ class Number extends Node implements \ArrayAccess
         try {
             return Util::checkRange('', new Range($min, $max), $this);
         } catch (RangeException $e) {
-            throw SassScriptException::forArgument(sprintf('Expected %s to be within %s%s and %s%3$s', $this, $min, $this->unitStr(), $max), $name);
+            throw SassScriptException::forArgument(sprintf('Expected %s to be within %s%s and %s%3$s.', $this, $min, $this->unitStr(), $max), $name);
+        }
+    }
+
+    /**
+     * @param float|int $min
+     * @param float|int $max
+     * @param string    $name
+     * @param string    $unit
+     *
+     * @return float|int
+     * @throws SassScriptException
+     *
+     * @internal
+     */
+    public function valueInRangeWithUnit($min, $max, $name, $unit)
+    {
+        try {
+            return Util::checkRange('', new Range($min, $max), $this);
+        } catch (RangeException $e) {
+            throw SassScriptException::forArgument(sprintf('Expected %s to be within %s%s and %s%3$s.', $this, $min, $unit, $max), $name);
         }
     }
 
@@ -524,7 +564,7 @@ class Number extends Node implements \ArrayAccess
 
         try {
             return $this->coerceUnits($other, function ($num1, $num2) {
-                return round($num1,self::PRECISION) == round($num2, self::PRECISION);
+                return round($num1, self::PRECISION) == round($num2, self::PRECISION);
             });
         } catch (SassScriptException $e) {
             return false;
diff --git a/lib/scssphp/scssphp/src/OutputStyle.php b/lib/scssphp/scssphp/src/OutputStyle.php
index c284639c1..a1d8b4255 100644
--- a/lib/scssphp/scssphp/src/OutputStyle.php
+++ b/lib/scssphp/scssphp/src/OutputStyle.php
@@ -1,9 +1,62 @@
 <?php
 
+/**
+ * SCSSPHP
+ *
+ * @copyright 2012-2020 Leaf Corcoran
+ *
+ * @license http://opensource.org/licenses/MIT MIT
+ *
+ * @link http://scssphp.github.io/scssphp
+ */
+
 namespace ScssPhp\ScssPhp;
 
 final class OutputStyle
 {
     const EXPANDED = 'expanded';
     const COMPRESSED = 'compressed';
+
+    /**
+     * Converts a string to an output style.
+     *
+     * Using this method allows to write code which will support both
+     * versions 1.12+ and 2.0 of Scssphp. In 2.0, OutputStyle will be
+     * an enum instead of using string constants.
+     *
+     * @param string $string
+     *
+     * @return self::*
+     */
+    public static function fromString($string)
+    {
+        switch ($string) {
+            case 'expanded':
+                return self::EXPANDED;
+
+            case 'compressed':
+                return self::COMPRESSED;
+
+            default:
+                throw new \InvalidArgumentException('Invalid output style');
+        }
+    }
+
+    /**
+     * Converts an output style to a string supported by {@see OutputStyle::fromString()}.
+     *
+     * Using this method allows to write code which will support both
+     * versions 1.12+ and 2.0 of Scssphp. In 2.0, OutputStyle will be
+     * an enum instead of using string constants.
+     * The returned string representation is guaranteed to be compatible
+     * between 1.12 and 2.0.
+     *
+     * @param self::* $outputStyle
+     *
+     * @return string
+     */
+    public static function toString($outputStyle)
+    {
+        return $outputStyle;
+    }
 }
diff --git a/lib/scssphp/scssphp/src/Parser.php b/lib/scssphp/scssphp/src/Parser.php
index e9cbaf375..2666a263c 100644
--- a/lib/scssphp/scssphp/src/Parser.php
+++ b/lib/scssphp/scssphp/src/Parser.php
@@ -273,6 +273,11 @@ class Parser
         $this->saveEncoding();
         $this->extractLineNumbers($buffer);
 
+        if ($this->utf8 && !preg_match('//u', $buffer)) {
+            $message = $this->sourceName ? 'Invalid UTF-8 file: ' . $this->sourceName : 'Invalid UTF-8 file';
+            throw new ParserException($message);
+        }
+
         $this->pushBlock(null); // root block
         $this->whitespace();
         $this->pushBlock(null);
@@ -323,6 +328,13 @@ class Parser
 
         $list = $this->valueList($out);
 
+        if ($this->count !== \strlen($this->buffer)) {
+            $error = $this->parseError('Expected end of value');
+            $message = 'Passing trailing content after the expression when parsing a value is deprecated since Scssphp 1.12.0 and will be an error in 2.0. ' . $error->getMessage();
+
+            @trigger_error($message, E_USER_DEPRECATED);
+        }
+
         $this->restoreEncoding();
 
         return $list;
@@ -383,10 +395,13 @@ class Parser
         $this->inParens        = false;
         $this->eatWhiteDefault = true;
         $this->buffer          = (string) $buffer;
+        $this->discardComments = true;
 
         $this->saveEncoding();
         $this->extractLineNumbers($this->buffer);
 
+        $this->whitespace();
+
         $isMediaQuery = $this->mediaQueryList($out);
 
         $this->restoreEncoding();
@@ -1678,9 +1693,9 @@ class Parser
      */
     protected function appendComment($comment)
     {
-        assert($this->env !== null);
-
         if (! $this->discardComments) {
+            assert($this->env !== null);
+
             $this->env->comments[] = $comment;
         }
     }
@@ -2461,7 +2476,7 @@ class Parser
         $whiteBefore = isset($this->buffer[$this->count - 1]) &&
             ctype_space($this->buffer[$this->count - 1]);
 
-        while ($this->match($operators, $m, false) && static::$precedence[$m[1]] >= $minP) {
+        while ($this->match($operators, $m, false) && static::$precedence[strtolower($m[1])] >= $minP) {
             $whiteAfter = isset($this->buffer[$this->count]) &&
                 ctype_space($this->buffer[$this->count]);
             $varAfter = isset($this->buffer[$this->count]) &&
@@ -2485,7 +2500,7 @@ class Parser
             }
 
             // consume higher-precedence operators on the right-hand side
-            $rhs = $this->expHelper($rhs, static::$precedence[$op] + 1);
+            $rhs = $this->expHelper($rhs, static::$precedence[strtolower($op)] + 1);
 
             $lhs = [Type::T_EXPRESSION, $op, $lhs, $rhs, $this->inParens, $whiteBefore, $whiteAfter];
 
@@ -2804,6 +2819,10 @@ class Parser
                     $this->argValues($args) &&
                     $this->matchChar(')')
                 ) {
+                    if (strtolower($name) === 'var' && \count($args) === 2 && $args[1][0] === Type::T_NULL) {
+                        $args[1] = [null, [Type::T_STRING, '', [' ']], false];
+                    }
+
                     $func = [Type::T_FUNCTION_CALL, $name, $args];
 
                     return true;
diff --git a/lib/scssphp/scssphp/src/Version.php b/lib/scssphp/scssphp/src/Version.php
index 5848a0ed0..89bd59526 100644
--- a/lib/scssphp/scssphp/src/Version.php
+++ b/lib/scssphp/scssphp/src/Version.php
@@ -19,5 +19,5 @@ namespace ScssPhp\ScssPhp;
  */
 class Version
 {
-    const VERSION = '1.10.5';
+    const VERSION = '1.12.1';
 }
diff --git a/setup/setuputils.class.inc.php b/setup/setuputils.class.inc.php
index 64f134ee3..5548a477a 100644
--- a/setup/setuputils.class.inc.php
+++ b/setup/setuputils.class.inc.php
@@ -104,7 +104,7 @@ class SetupUtils
 	const PHP_NEXT_MIN_VERSION   = ''; // No new PHP requirement for next iTop version yet
 	const MYSQL_NEXT_MIN_VERSION = ''; // No new MySQL requirement for next iTop version yet
 	// -- First recent version that is not yet validated by Combodo (warning)
-	const PHP_NOT_VALIDATED_VERSION = '8.2.0';
+	const PHP_NOT_VALIDATED_VERSION = '8.4.0';
 
 	const MIN_MEMORY_LIMIT             = '32M';
 	const SUHOSIN_GET_MAX_VALUE_LENGTH = 2048;