diff --git a/composer.json b/composer.json
index f60f13c52..c4e22c199 100644
--- a/composer.json
+++ b/composer.json
@@ -19,7 +19,7 @@
     "pear/archive_tar": "~1.4.14",
     "pelago/emogrifier": "^7.2.0",
     "psr/log": "^3.0.0",
-    "scssphp/scssphp": "^1.12.1",
+    "scssphp/scssphp": "dev-combodo/1.x",
     "symfony/console": "~6.4.0",
     "symfony/dotenv": "~6.4.0",
     "symfony/framework-bundle": "~6.4.0",
@@ -43,6 +43,10 @@
     {
       "type": "vcs",
       "url": "https://github.com/EsupPortail/phpCAS"
+    },
+    {
+      "type": "vcs",
+      "url": "https://github.com/combodo-itop-libs/scssphp"
     }
   ],
   "suggest": {
diff --git a/composer.lock b/composer.lock
index e59227f3e..6a95f3e03 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": "ceac38f6033afe07b7ab977fa39fe348",
+    "content-hash": "eebbdc6c10a479b0e62fc18d88496f5c",
     "packages": [
         {
             "name": "apereo/phpcas",
@@ -1588,16 +1588,16 @@
         },
         {
             "name": "scssphp/scssphp",
-            "version": "v1.13.0",
+            "version": "dev-combodo/1.x",
             "source": {
                 "type": "git",
-                "url": "https://github.com/scssphp/scssphp.git",
-                "reference": "63d1157457e5554edf00b0c1fabab4c1511d2520"
+                "url": "https://github.com/combodo-itop-libs/scssphp.git",
+                "reference": "dde81c0a39d02e8e6fc81b70269747734e16d526"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/scssphp/scssphp/zipball/63d1157457e5554edf00b0c1fabab4c1511d2520",
-                "reference": "63d1157457e5554edf00b0c1fabab4c1511d2520",
+                "url": "https://api.github.com/repos/combodo-itop-libs/scssphp/zipball/dde81c0a39d02e8e6fc81b70269747734e16d526",
+                "reference": "dde81c0a39d02e8e6fc81b70269747734e16d526",
                 "shasum": ""
             },
             "require": {
@@ -1626,8 +1626,8 @@
             "type": "library",
             "extra": {
                 "bamarni-bin": {
-                    "bin-links": false,
-                    "forward-command": false
+                    "forward-command": false,
+                    "bin-links": false
                 }
             },
             "autoload": {
@@ -1635,7 +1635,11 @@
                     "ScssPhp\\ScssPhp\\": "src/"
                 }
             },
-            "notification-url": "https://packagist.org/downloads/",
+            "autoload-dev": {
+                "psr-4": {
+                    "ScssPhp\\ScssPhp\\Tests\\": "tests/"
+                }
+            },
             "license": [
                 "MIT"
             ],
@@ -1661,10 +1665,9 @@
                 "stylesheet"
             ],
             "support": {
-                "issues": "https://github.com/scssphp/scssphp/issues",
-                "source": "https://github.com/scssphp/scssphp/tree/v1.13.0"
+                "source": "https://github.com/combodo-itop-libs/scssphp/tree/combodo/1.x"
             },
-            "time": "2024-08-17T21:02:11+00:00"
+            "time": "2026-03-23T15:26:59+00:00"
         },
         {
             "name": "soundasleep/html2text",
@@ -5097,7 +5100,8 @@
     "aliases": [],
     "minimum-stability": "stable",
     "stability-flags": {
-        "apereo/phpcas": 20
+        "apereo/phpcas": 20,
+        "scssphp/scssphp": 20
     },
     "prefer-stable": false,
     "prefer-lowest": false,
diff --git a/lib/composer/installed.json b/lib/composer/installed.json
index 2bacb38f9..3f57969c5 100644
--- a/lib/composer/installed.json
+++ b/lib/composer/installed.json
@@ -1654,17 +1654,17 @@
         },
         {
             "name": "scssphp/scssphp",
-            "version": "v1.13.0",
-            "version_normalized": "1.13.0.0",
+            "version": "dev-combodo/1.x",
+            "version_normalized": "dev-combodo/1.x",
             "source": {
                 "type": "git",
-                "url": "https://github.com/scssphp/scssphp.git",
-                "reference": "63d1157457e5554edf00b0c1fabab4c1511d2520"
+                "url": "https://github.com/combodo-itop-libs/scssphp.git",
+                "reference": "dde81c0a39d02e8e6fc81b70269747734e16d526"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/scssphp/scssphp/zipball/63d1157457e5554edf00b0c1fabab4c1511d2520",
-                "reference": "63d1157457e5554edf00b0c1fabab4c1511d2520",
+                "url": "https://api.github.com/repos/combodo-itop-libs/scssphp/zipball/dde81c0a39d02e8e6fc81b70269747734e16d526",
+                "reference": "dde81c0a39d02e8e6fc81b70269747734e16d526",
                 "shasum": ""
             },
             "require": {
@@ -1687,15 +1687,15 @@
                 "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": "2024-08-17T21:02:11+00:00",
+            "time": "2026-03-23T15:26:59+00:00",
             "bin": [
                 "bin/pscss"
             ],
             "type": "library",
             "extra": {
                 "bamarni-bin": {
-                    "bin-links": false,
-                    "forward-command": false
+                    "forward-command": false,
+                    "bin-links": false
                 }
             },
             "installation-source": "dist",
@@ -1704,7 +1704,11 @@
                     "ScssPhp\\ScssPhp\\": "src/"
                 }
             },
-            "notification-url": "https://packagist.org/downloads/",
+            "autoload-dev": {
+                "psr-4": {
+                    "ScssPhp\\ScssPhp\\Tests\\": "tests/"
+                }
+            },
             "license": [
                 "MIT"
             ],
@@ -1730,8 +1734,7 @@
                 "stylesheet"
             ],
             "support": {
-                "issues": "https://github.com/scssphp/scssphp/issues",
-                "source": "https://github.com/scssphp/scssphp/tree/v1.13.0"
+                "source": "https://github.com/combodo-itop-libs/scssphp/tree/combodo/1.x"
             },
             "install-path": "../scssphp/scssphp"
         },
diff --git a/lib/composer/installed.php b/lib/composer/installed.php
index f8012b9a7..a6ab69be6 100644
--- a/lib/composer/installed.php
+++ b/lib/composer/installed.php
@@ -292,9 +292,9 @@
             'dev_requirement' => false,
         ),
         'scssphp/scssphp' => array(
-            'pretty_version' => 'v1.13.0',
-            'version' => '1.13.0.0',
-            'reference' => '63d1157457e5554edf00b0c1fabab4c1511d2520',
+            'pretty_version' => 'dev-combodo/1.x',
+            'version' => 'dev-combodo/1.x',
+            'reference' => 'dde81c0a39d02e8e6fc81b70269747734e16d526',
             'type' => 'library',
             'install_path' => __DIR__ . '/../scssphp/scssphp',
             'aliases' => array(),
diff --git a/lib/scssphp/scssphp/src/Compiler.php b/lib/scssphp/scssphp/src/Compiler.php
index d654ee6eb..c7c14435c 100644
--- a/lib/scssphp/scssphp/src/Compiler.php
+++ b/lib/scssphp/scssphp/src/Compiler.php
@@ -5052,7 +5052,7 @@ EOL;
      *
      * @return array
      */
-    protected function multiplyMedia(Environment $env = null, $childQueries = null)
+    protected function multiplyMedia(?Environment $env = null, $childQueries = null)
     {
         if (
             ! isset($env) ||
@@ -5144,7 +5144,7 @@ EOL;
      *
      * @return \ScssPhp\ScssPhp\Compiler\Environment
      */
-    protected function pushEnv(Block $block = null)
+    protected function pushEnv(?Block $block = null)
     {
         $env = new Environment();
         $env->parent = $this->env;
@@ -5208,7 +5208,7 @@ EOL;
      *
      * @return void
      */
-    protected function set($name, $value, $shadow = false, Environment $env = null, $valueUnreduced = null)
+    protected function set($name, $value, $shadow = false, ?Environment $env = null, $valueUnreduced = null)
     {
         $name = $this->normalizeName($name);
 
@@ -5314,7 +5314,7 @@ EOL;
      *
      * @return mixed|null
      */
-    public function get($name, $shouldThrow = true, Environment $env = null, $unreduced = false)
+    public function get($name, $shouldThrow = true, ?Environment $env = null, $unreduced = false)
     {
         $normalizedName = $this->normalizeName($name);
         $specialContentKey = static::$namespaces['special'] . 'content';
@@ -5379,7 +5379,7 @@ EOL;
      *
      * @return bool
      */
-    protected function has($name, Environment $env = null)
+    protected function has($name, ?Environment $env = null)
     {
         return ! \is_null($this->get($name, false, $env));
     }
diff --git a/lib/scssphp/scssphp/src/Formatter.php b/lib/scssphp/scssphp/src/Formatter.php
index 6137dc650..c477e6f99 100644
--- a/lib/scssphp/scssphp/src/Formatter.php
+++ b/lib/scssphp/scssphp/src/Formatter.php
@@ -272,7 +272,7 @@ abstract class Formatter
      *
      * @return string
      */
-    public function format(OutputBlock $block, SourceMapGenerator $sourceMapGenerator = null)
+    public function format(OutputBlock $block, ?SourceMapGenerator $sourceMapGenerator = null)
     {
         $this->sourceMapGenerator = null;
 
diff --git a/lib/scssphp/scssphp/src/Node/Number.php b/lib/scssphp/scssphp/src/Node/Number.php
index 6c0445876..a38ba5f17 100644
--- a/lib/scssphp/scssphp/src/Node/Number.php
+++ b/lib/scssphp/scssphp/src/Node/Number.php
@@ -578,7 +578,7 @@ class Number extends Node implements \ArrayAccess, \JsonSerializable
      *
      * @return string
      */
-    public function output(Compiler $compiler = null)
+    public function output(?Compiler $compiler = null)
     {
         $dimension = round($this->dimension, self::PRECISION);
 
diff --git a/lib/scssphp/scssphp/src/Parser.php b/lib/scssphp/scssphp/src/Parser.php
index e7cb2e8c1..674a08026 100644
--- a/lib/scssphp/scssphp/src/Parser.php
+++ b/lib/scssphp/scssphp/src/Parser.php
@@ -140,7 +140,7 @@ class Parser
      * @param bool                 $cssOnly
      * @param LoggerInterface|null $logger
      */
-    public function __construct($sourceName, $sourceIndex = 0, $encoding = 'utf-8', Cache $cache = null, $cssOnly = false, LoggerInterface $logger = null)
+    public function __construct($sourceName, $sourceIndex = 0, $encoding = 'utf-8', ?Cache $cache = null, $cssOnly = false, ?LoggerInterface $logger = null)
     {
         $this->sourceName       = $sourceName ?: '(stdin)';
         $this->sourceIndex      = $sourceIndex;
diff --git a/lib/scssphp/scssphp/src/Warn.php b/lib/scssphp/scssphp/src/Warn.php
index 592b44c70..7ad061520 100644
--- a/lib/scssphp/scssphp/src/Warn.php
+++ b/lib/scssphp/scssphp/src/Warn.php
@@ -59,7 +59,7 @@ final class Warn
      *
      * @internal
      */
-    public static function setCallback(callable $callback = null)
+    public static function setCallback(?callable $callback = null)
     {
         $previousCallback = self::$callback;
         self::$callback = $callback;