diff --git a/CHANGELOG.md b/CHANGELOG.md
index 323057a7..01d15d7b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,12 @@
 # v1.10.21
 ## 09/14/2021
 
+1. [](#new)
+    * Updated SCSS compiler to v1.7
+
+# v1.10.21
+## 09/14/2021
+
 1. [](#new)
     * Require **Grav 1.7.21**
 2. [](#improved)
diff --git a/composer.json b/composer.json
index 3f629ea5..b7f3b4d2 100644
--- a/composer.json
+++ b/composer.json
@@ -23,7 +23,7 @@
         "php": "^7.3.6 || ^8.0",
         "ext-json": "*",
         "p3k/picofeed": "@stable",
-        "scssphp/scssphp": "^1.5"
+        "scssphp/scssphp": "^1.7"
     },
     "require-dev": {
         "codeception/codeception": "^2.4",
diff --git a/composer.lock b/composer.lock
index a9474ec4..8240cb87 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": "e00ccb05e2b5cfc4c32a0ee55a9bb686",
+    "content-hash": "9841a8a750e293f602d3064be4fd61b4",
     "packages": [
         {
             "name": "laminas/laminas-xml",
@@ -188,16 +188,16 @@
         },
         {
             "name": "scssphp/scssphp",
-            "version": "v1.6.0",
+            "version": "v1.7.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/scssphp/scssphp.git",
-                "reference": "b83594e2323c5d6e80785df3f91b9d1d32aad530"
+                "reference": "797f76527c72bc4fe4ee32a94c4732e8d94517ae"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/scssphp/scssphp/zipball/b83594e2323c5d6e80785df3f91b9d1d32aad530",
-                "reference": "b83594e2323c5d6e80785df3f91b9d1d32aad530",
+                "url": "https://api.github.com/repos/scssphp/scssphp/zipball/797f76527c72bc4fe4ee32a94c4732e8d94517ae",
+                "reference": "797f76527c72bc4fe4ee32a94c4732e8d94517ae",
                 "shasum": ""
             },
             "require": {
@@ -255,9 +255,9 @@
             ],
             "support": {
                 "issues": "https://github.com/scssphp/scssphp/issues",
-                "source": "https://github.com/scssphp/scssphp/tree/v1.6.0"
+                "source": "https://github.com/scssphp/scssphp/tree/v1.7.0"
             },
-            "time": "2021-07-02T16:28:10+00:00"
+            "time": "2021-09-15T21:57:30+00:00"
         }
     ],
     "packages-dev": [
@@ -2425,7 +2425,6 @@
                     "type": "github"
                 }
             ],
-            "abandoned": true,
             "time": "2020-11-30T07:30:19+00:00"
         },
         {
diff --git a/vendor/autoload.php b/vendor/autoload.php
index 28ec6afe..c3bc8d59 100644
--- a/vendor/autoload.php
+++ b/vendor/autoload.php
@@ -4,4 +4,4 @@
 
 require_once __DIR__ . '/composer/autoload_real.php';
 
-return ComposerAutoloaderInit14b786715d80b97050af9c30f5c07b7c::getLoader();
+return ComposerAutoloaderInitd6a520eb662703b9aa0b94d2e30cc77f::getLoader();
diff --git a/vendor/composer/InstalledVersions.php b/vendor/composer/InstalledVersions.php
index 15b928f2..c14fe2dd 100644
--- a/vendor/composer/InstalledVersions.php
+++ b/vendor/composer/InstalledVersions.php
@@ -29,7 +29,7 @@ private static $installed = array (
     'aliases' => 
     array (
     ),
-    'reference' => 'ea31417d33e4e26168a4130260ce0c727f0f8fbc',
+    'reference' => '879819123303cf642c0552339cc2e1b46e94aab1',
     'name' => 'getgrav/grav-plugin-admin',
   ),
   'versions' => 
@@ -41,7 +41,7 @@ private static $installed = array (
       'aliases' => 
       array (
       ),
-      'reference' => 'ea31417d33e4e26168a4130260ce0c727f0f8fbc',
+      'reference' => '879819123303cf642c0552339cc2e1b46e94aab1',
     ),
     'laminas/laminas-xml' => 
     array (
@@ -79,12 +79,12 @@ private static $installed = array (
     ),
     'scssphp/scssphp' => 
     array (
-      'pretty_version' => 'v1.6.0',
-      'version' => '1.6.0.0',
+      'pretty_version' => 'v1.7.0',
+      'version' => '1.7.0.0',
       'aliases' => 
       array (
       ),
-      'reference' => 'b83594e2323c5d6e80785df3f91b9d1d32aad530',
+      'reference' => '797f76527c72bc4fe4ee32a94c4732e8d94517ae',
     ),
     'symfony/polyfill-php72' => 
     array (
diff --git a/vendor/composer/autoload_real.php b/vendor/composer/autoload_real.php
index 45410a1e..68782093 100644
--- a/vendor/composer/autoload_real.php
+++ b/vendor/composer/autoload_real.php
@@ -2,7 +2,7 @@
 
 // autoload_real.php @generated by Composer
 
-class ComposerAutoloaderInit14b786715d80b97050af9c30f5c07b7c
+class ComposerAutoloaderInitd6a520eb662703b9aa0b94d2e30cc77f
 {
     private static $loader;
 
@@ -24,15 +24,15 @@ class ComposerAutoloaderInit14b786715d80b97050af9c30f5c07b7c
 
         require __DIR__ . '/platform_check.php';
 
-        spl_autoload_register(array('ComposerAutoloaderInit14b786715d80b97050af9c30f5c07b7c', 'loadClassLoader'), true, true);
+        spl_autoload_register(array('ComposerAutoloaderInitd6a520eb662703b9aa0b94d2e30cc77f', 'loadClassLoader'), true, true);
         self::$loader = $loader = new \Composer\Autoload\ClassLoader();
-        spl_autoload_unregister(array('ComposerAutoloaderInit14b786715d80b97050af9c30f5c07b7c', 'loadClassLoader'));
+        spl_autoload_unregister(array('ComposerAutoloaderInitd6a520eb662703b9aa0b94d2e30cc77f', 'loadClassLoader'));
 
         $useStaticLoader = PHP_VERSION_ID >= 50600 && !defined('HHVM_VERSION') && (!function_exists('zend_loader_file_encoded') || !zend_loader_file_encoded());
         if ($useStaticLoader) {
             require __DIR__ . '/autoload_static.php';
 
-            call_user_func(\Composer\Autoload\ComposerStaticInit14b786715d80b97050af9c30f5c07b7c::getInitializer($loader));
+            call_user_func(\Composer\Autoload\ComposerStaticInitd6a520eb662703b9aa0b94d2e30cc77f::getInitializer($loader));
         } else {
             $map = require __DIR__ . '/autoload_namespaces.php';
             foreach ($map as $namespace => $path) {
@@ -53,19 +53,19 @@ class ComposerAutoloaderInit14b786715d80b97050af9c30f5c07b7c
         $loader->register(true);
 
         if ($useStaticLoader) {
-            $includeFiles = Composer\Autoload\ComposerStaticInit14b786715d80b97050af9c30f5c07b7c::$files;
+            $includeFiles = Composer\Autoload\ComposerStaticInitd6a520eb662703b9aa0b94d2e30cc77f::$files;
         } else {
             $includeFiles = require __DIR__ . '/autoload_files.php';
         }
         foreach ($includeFiles as $fileIdentifier => $file) {
-            composerRequire14b786715d80b97050af9c30f5c07b7c($fileIdentifier, $file);
+            composerRequired6a520eb662703b9aa0b94d2e30cc77f($fileIdentifier, $file);
         }
 
         return $loader;
     }
 }
 
-function composerRequire14b786715d80b97050af9c30f5c07b7c($fileIdentifier, $file)
+function composerRequired6a520eb662703b9aa0b94d2e30cc77f($fileIdentifier, $file)
 {
     if (empty($GLOBALS['__composer_autoload_files'][$fileIdentifier])) {
         require $file;
diff --git a/vendor/composer/autoload_static.php b/vendor/composer/autoload_static.php
index 312cbd7b..71c12e02 100644
--- a/vendor/composer/autoload_static.php
+++ b/vendor/composer/autoload_static.php
@@ -4,7 +4,7 @@
 
 namespace Composer\Autoload;
 
-class ComposerStaticInit14b786715d80b97050af9c30f5c07b7c
+class ComposerStaticInitd6a520eb662703b9aa0b94d2e30cc77f
 {
     public static $files = array (
         '7e9bd612cc444b3eed788ebbe46263a0' => __DIR__ . '/..' . '/laminas/laminas-zendframework-bridge/src/autoload.php',
@@ -63,10 +63,10 @@ class ComposerStaticInit14b786715d80b97050af9c30f5c07b7c
     public static function getInitializer(ClassLoader $loader)
     {
         return \Closure::bind(function () use ($loader) {
-            $loader->prefixLengthsPsr4 = ComposerStaticInit14b786715d80b97050af9c30f5c07b7c::$prefixLengthsPsr4;
-            $loader->prefixDirsPsr4 = ComposerStaticInit14b786715d80b97050af9c30f5c07b7c::$prefixDirsPsr4;
-            $loader->prefixesPsr0 = ComposerStaticInit14b786715d80b97050af9c30f5c07b7c::$prefixesPsr0;
-            $loader->classMap = ComposerStaticInit14b786715d80b97050af9c30f5c07b7c::$classMap;
+            $loader->prefixLengthsPsr4 = ComposerStaticInitd6a520eb662703b9aa0b94d2e30cc77f::$prefixLengthsPsr4;
+            $loader->prefixDirsPsr4 = ComposerStaticInitd6a520eb662703b9aa0b94d2e30cc77f::$prefixDirsPsr4;
+            $loader->prefixesPsr0 = ComposerStaticInitd6a520eb662703b9aa0b94d2e30cc77f::$prefixesPsr0;
+            $loader->classMap = ComposerStaticInitd6a520eb662703b9aa0b94d2e30cc77f::$classMap;
 
         }, null, ClassLoader::class);
     }
diff --git a/vendor/composer/installed.json b/vendor/composer/installed.json
index 2b1a8a71..104dc549 100644
--- a/vendor/composer/installed.json
+++ b/vendor/composer/installed.json
@@ -191,17 +191,17 @@
         },
         {
             "name": "scssphp/scssphp",
-            "version": "v1.6.0",
-            "version_normalized": "1.6.0.0",
+            "version": "v1.7.0",
+            "version_normalized": "1.7.0.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/scssphp/scssphp.git",
-                "reference": "b83594e2323c5d6e80785df3f91b9d1d32aad530"
+                "reference": "797f76527c72bc4fe4ee32a94c4732e8d94517ae"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/scssphp/scssphp/zipball/b83594e2323c5d6e80785df3f91b9d1d32aad530",
-                "reference": "b83594e2323c5d6e80785df3f91b9d1d32aad530",
+                "url": "https://api.github.com/repos/scssphp/scssphp/zipball/797f76527c72bc4fe4ee32a94c4732e8d94517ae",
+                "reference": "797f76527c72bc4fe4ee32a94c4732e8d94517ae",
                 "shasum": ""
             },
             "require": {
@@ -223,7 +223,7 @@
                 "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": "2021-07-02T16:28:10+00:00",
+            "time": "2021-09-15T21:57:30+00:00",
             "bin": [
                 "bin/pscss"
             ],
@@ -261,7 +261,7 @@
             ],
             "support": {
                 "issues": "https://github.com/scssphp/scssphp/issues",
-                "source": "https://github.com/scssphp/scssphp/tree/v1.6.0"
+                "source": "https://github.com/scssphp/scssphp/tree/v1.7.0"
             },
             "install-path": "../scssphp/scssphp"
         }
diff --git a/vendor/composer/installed.php b/vendor/composer/installed.php
index 61e42ba5..4dd9fee4 100644
--- a/vendor/composer/installed.php
+++ b/vendor/composer/installed.php
@@ -6,7 +6,7 @@
     'aliases' => 
     array (
     ),
-    'reference' => 'ea31417d33e4e26168a4130260ce0c727f0f8fbc',
+    'reference' => '879819123303cf642c0552339cc2e1b46e94aab1',
     'name' => 'getgrav/grav-plugin-admin',
   ),
   'versions' => 
@@ -18,7 +18,7 @@
       'aliases' => 
       array (
       ),
-      'reference' => 'ea31417d33e4e26168a4130260ce0c727f0f8fbc',
+      'reference' => '879819123303cf642c0552339cc2e1b46e94aab1',
     ),
     'laminas/laminas-xml' => 
     array (
@@ -56,12 +56,12 @@
     ),
     'scssphp/scssphp' => 
     array (
-      'pretty_version' => 'v1.6.0',
-      'version' => '1.6.0.0',
+      'pretty_version' => 'v1.7.0',
+      'version' => '1.7.0.0',
       'aliases' => 
       array (
       ),
-      'reference' => 'b83594e2323c5d6e80785df3f91b9d1d32aad530',
+      'reference' => '797f76527c72bc4fe4ee32a94c4732e8d94517ae',
     ),
     'symfony/polyfill-php72' => 
     array (
diff --git a/vendor/scssphp/scssphp/composer.json b/vendor/scssphp/scssphp/composer.json
index 1c6d7625..e4895871 100644
--- a/vendor/scssphp/scssphp/composer.json
+++ b/vendor/scssphp/scssphp/composer.json
@@ -49,16 +49,16 @@
             "type": "package",
             "package": {
                 "name": "sass/sass-spec",
-                "version": "2021.06.30",
+                "version": "2021.09.15",
                 "source": {
                     "type": "git",
                     "url": "https://github.com/sass/sass-spec.git",
-                    "reference": "e348959657f1e274cef658283436a311a925a673"
+                    "reference": "eb2d7a0865c1faf0b55a39ff962b24aca9b4c955"
                 },
                 "dist": {
                     "type": "zip",
-                    "url": "https://api.github.com/repos/sass/sass-spec/zipball/e348959657f1e274cef658283436a311a925a673",
-                    "reference": "e348959657f1e274cef658283436a311a925a673",
+                    "url": "https://api.github.com/repos/sass/sass-spec/zipball/eb2d7a0865c1faf0b55a39ff962b24aca9b4c955",
+                    "reference": "eb2d7a0865c1faf0b55a39ff962b24aca9b4c955",
                     "shasum": ""
                 }
             }
diff --git a/vendor/scssphp/scssphp/src/Compiler.php b/vendor/scssphp/scssphp/src/Compiler.php
index b9d42bb1..56713094 100644
--- a/vendor/scssphp/scssphp/src/Compiler.php
+++ b/vendor/scssphp/scssphp/src/Compiler.php
@@ -193,6 +193,11 @@ class Compiler
      */
     protected $sourceMapOptions = [];
 
+    /**
+     * @var bool
+     */
+    private $charset = true;
+
     /**
      * @var string|\ScssPhp\ScssPhp\Formatter
      */
@@ -221,6 +226,8 @@ class Compiler
     protected $storeEnv;
     /**
      * @var bool|null
+     *
+     * @deprecated
      */
     protected $charsetSeen;
     /**
@@ -463,7 +470,6 @@ class Compiler
         $this->env            = null;
         $this->scope          = null;
         $this->storeEnv       = null;
-        $this->charsetSeen    = null;
         $this->shouldEvaluate = null;
         $this->ignoreCallStackMessage = false;
         $this->parsedFiles = [];
@@ -516,11 +522,9 @@ class Compiler
 
             $prefix = '';
 
-            if (!$this->charsetSeen) {
-                if (strlen($out) !== Util::mbStrlen($out)) {
-                    $prefix = '@charset "UTF-8";' . "\n";
-                    $out = $prefix . $out;
-                }
+            if ($this->charset && strlen($out) !== Util::mbStrlen($out)) {
+                $prefix = '@charset "UTF-8";' . "\n";
+                $out = $prefix . $out;
             }
 
             $sourceMap = null;
@@ -2877,10 +2881,6 @@ class Compiler
                 break;
 
             case Type::T_CHARSET:
-                if (! $this->charsetSeen) {
-                    $this->charsetSeen = true;
-                    $this->appendRootDirective('@charset ' . $this->compileValue($child[1]) . ';', $out);
-                }
                 break;
 
             case Type::T_CUSTOM_PROPERTY:
@@ -5498,6 +5498,25 @@ EOL;
                        . 'Use source maps instead.', E_USER_DEPRECATED);
     }
 
+    /**
+     * Configures the handling of non-ASCII outputs.
+     *
+     * If $charset is `true`, this will include a `@charset` declaration or a
+     * UTF-8 [byte-order mark][] if the stylesheet contains any non-ASCII
+     * characters. Otherwise, it will never include a `@charset` declaration or a
+     * byte-order mark.
+     *
+     * [byte-order mark]: https://en.wikipedia.org/wiki/Byte_order_mark#UTF-8
+     *
+     * @param bool $charset
+     *
+     * @return void
+     */
+    public function setCharset($charset)
+    {
+        $this->charset = $charset;
+    }
+
     /**
      * Enable/disable source maps
      *
@@ -5872,7 +5891,7 @@ EOL;
         }
 
         if (0 === strpos($normalizedPath, $normalizedRootDirectory)) {
-            return substr($normalizedPath, \strlen($normalizedRootDirectory));
+            return substr($path, \strlen($normalizedRootDirectory));
         }
 
         return $path;
@@ -7209,9 +7228,13 @@ EOL;
      * @param array|Number $value
      *
      * @return integer|float
+     *
+     * @deprecated
      */
     protected function coercePercent($value)
     {
+        @trigger_error(sprintf('"%s" is deprecated since 1.7.0.', __METHOD__), E_USER_DEPRECATED);
+
         if ($value instanceof Number) {
             if ($value->hasUnit('%')) {
                 return $value->getDimension() / 100;
@@ -7719,7 +7742,7 @@ EOL;
                             [$funcName . '(', $color[1], ', ', $color[2], ', ', $color[3], ', ', $alpha, ')']];
                     }
                 } else {
-                    $color = [Type::T_STRING, '', [$funcName . '(', $args[0], ')']];
+                    $color = [Type::T_STRING, '', [$funcName . '(', $args[0], ', ', $args[1], ')']];
                 }
                 break;
 
@@ -8020,8 +8043,8 @@ EOL;
 
     // mix two colors
     protected static $libMix = [
-        ['color1', 'color2', 'weight:0.5'],
-        ['color-1', 'color-2', 'weight:0.5']
+        ['color1', 'color2', 'weight:50%'],
+        ['color-1', 'color-2', 'weight:50%']
         ];
     protected function libMix($args)
     {
@@ -8029,25 +8052,26 @@ EOL;
 
         $first = $this->assertColor($first, 'color1');
         $second = $this->assertColor($second, 'color2');
-        $weight = $this->coercePercent($this->assertNumber($weight, 'weight'));
+        $weightScale = $this->assertNumber($weight, 'weight')->valueInRange(0, 100, 'weight') / 100;
 
         $firstAlpha = isset($first[4]) ? $first[4] : 1;
         $secondAlpha = isset($second[4]) ? $second[4] : 1;
 
-        $w = $weight * 2 - 1;
-        $a = $firstAlpha - $secondAlpha;
+        $normalizedWeight = $weightScale * 2 - 1;
+        $alphaDistance = $firstAlpha - $secondAlpha;
 
-        $w1 = (($w * $a === -1 ? $w : ($w + $a) / (1 + $w * $a)) + 1) / 2.0;
-        $w2 = 1.0 - $w1;
+        $combinedWeight = $normalizedWeight * $alphaDistance == -1 ? $normalizedWeight : ($normalizedWeight + $alphaDistance) / (1 + $normalizedWeight * $alphaDistance);
+        $weight1 = ($combinedWeight + 1) / 2.0;
+        $weight2 = 1.0 - $weight1;
 
         $new = [Type::T_COLOR,
-            $w1 * $first[1] + $w2 * $second[1],
-            $w1 * $first[2] + $w2 * $second[2],
-            $w1 * $first[3] + $w2 * $second[3],
+            $weight1 * $first[1] + $weight2 * $second[1],
+            $weight1 * $first[2] + $weight2 * $second[2],
+            $weight1 * $first[3] + $weight2 * $second[3],
         ];
 
         if ($firstAlpha != 1.0 || $secondAlpha != 1.0) {
-            $new[] = $firstAlpha * $weight + $secondAlpha * (1 - $weight);
+            $new[] = $firstAlpha * $weightScale + $secondAlpha * (1 - $weightScale);
         }
 
         return $this->fixColor($new);
@@ -8306,6 +8330,12 @@ EOL;
     {
         $hsl = $this->toHSL($color[1], $color[2], $color[3]);
         $hsl[$idx] += $amount;
+
+        if ($idx !== 1) {
+            // Clamp the saturation and lightness
+            $hsl[$idx] = min(max(0, $hsl[$idx]), 100);
+        }
+
         $out = $this->toRGB($hsl[1], $hsl[2], $hsl[3]);
 
         if (isset($color[4])) {
@@ -8353,19 +8383,19 @@ EOL;
             return null;
         }
 
-        $color = $this->assertColor($value, 'color');
-        $amount = 100 * $this->coercePercent($this->assertNumber($args[1], 'amount'));
+        $color = $this->assertColor($args[0], 'color');
+        $amount = $this->assertNumber($args[1], 'amount');
 
-        return $this->adjustHsl($color, 2, $amount);
+        return $this->adjustHsl($color, 2, $amount->valueInRange(0, 100, 'amount'));
     }
 
     protected static $libDesaturate = ['color', 'amount'];
     protected function libDesaturate($args)
     {
         $color = $this->assertColor($args[0], 'color');
-        $amount = 100 * $this->coercePercent($this->assertNumber($args[1], 'amount'));
+        $amount = $this->assertNumber($args[1], 'amount');
 
-        return $this->adjustHsl($color, 2, -$amount);
+        return $this->adjustHsl($color, 2, -$amount->valueInRange(0, 100, 'amount'));
     }
 
     protected static $libGrayscale = ['color'];
@@ -8386,28 +8416,28 @@ EOL;
         return $this->adjustHsl($this->assertColor($args[0], 'color'), 1, 180);
     }
 
-    protected static $libInvert = ['color', 'weight:1'];
+    protected static $libInvert = ['color', 'weight:100%'];
     protected function libInvert($args)
     {
         $value = $args[0];
 
+        $weight = $this->assertNumber($args[1], 'weight');
+
         if ($value instanceof Number) {
+            if ($weight->getDimension() != 100 || !$weight->hasUnit('%')) {
+                throw new SassScriptException('Only one argument may be passed to the plain-CSS invert() function.');
+            }
+
             return null;
         }
 
-        $weight = $this->coercePercent($this->assertNumber($args[1], 'weight'));
-
         $color = $this->assertColor($value, 'color');
         $inverted = $color;
         $inverted[1] = 255 - $inverted[1];
         $inverted[2] = 255 - $inverted[2];
         $inverted[3] = 255 - $inverted[3];
 
-        if ($weight < 1) {
-            return $this->libMix([$inverted, $color, new Number($weight, '')]);
-        }
-
-        return $inverted;
+        return $this->libMix([$inverted, $color, $weight]);
     }
 
     // increases opacity by amount
@@ -8415,9 +8445,9 @@ EOL;
     protected function libOpacify($args)
     {
         $color = $this->assertColor($args[0], 'color');
-        $amount = $this->coercePercent($this->assertNumber($args[1], 'amount'));
+        $amount = $this->assertNumber($args[1], 'amount');
 
-        $color[4] = (isset($color[4]) ? $color[4] : 1) + $amount;
+        $color[4] = (isset($color[4]) ? $color[4] : 1) + $amount->valueInRange(0, 1, 'amount');
         $color[4] = min(1, max(0, $color[4]));
 
         return $color;
@@ -8434,9 +8464,9 @@ EOL;
     protected function libTransparentize($args)
     {
         $color = $this->assertColor($args[0], 'color');
-        $amount = $this->coercePercent($this->assertNumber($args[1], 'amount'));
+        $amount = $this->assertNumber($args[1], 'amount');
 
-        $color[4] = (isset($color[4]) ? $color[4] : 1) - $amount;
+        $color[4] = (isset($color[4]) ? $color[4] : 1) - $amount->valueInRange(0, 1, 'amount');
         $color[4] = min(1, max(0, $color[4]));
 
         return $color;
diff --git a/vendor/scssphp/scssphp/src/Parser.php b/vendor/scssphp/scssphp/src/Parser.php
index ab54885e..3ba2f67f 100644
--- a/vendor/scssphp/scssphp/src/Parser.php
+++ b/vendor/scssphp/scssphp/src/Parser.php
@@ -1580,7 +1580,9 @@ class Parser
                     } else {
                         list($line, $column) = $this->getSourcePosition($this->count);
                         $file = $this->sourceName;
-                        $this->logger->warn("Unterminated interpolations in multiline comments are deprecated and will be removed in ScssPhp 2.0, in \"$file\", line $line, column $column.", true);
+                        if (!$this->discardComments) {
+                            $this->logger->warn("Unterminated interpolations in multiline comments are deprecated and will be removed in ScssPhp 2.0, in \"$file\", line $line, column $column.", true);
+                        }
                         $comment[] = substr($this->buffer, $this->count, 2);
 
                         $this->count += 2;
diff --git a/vendor/scssphp/scssphp/src/Version.php b/vendor/scssphp/scssphp/src/Version.php
index b103b4bf..4cc0bb68 100644
--- a/vendor/scssphp/scssphp/src/Version.php
+++ b/vendor/scssphp/scssphp/src/Version.php
@@ -19,5 +19,5 @@ namespace ScssPhp\ScssPhp;
  */
 class Version
 {
-    const VERSION = '1.6.0';
+    const VERSION = '1.7.0';
 }