diff --git a/composer.json b/composer.json
index 58a5fe4..48060bb 100644
--- a/composer.json
+++ b/composer.json
@@ -29,12 +29,17 @@
         {
             "type": "vcs",
             "url": "https://github.com/JellyBellyDev/phpspec-data-provider-extension"
+        },
+        {
+            "type": "vcs",
+            "url": "https://github.com/cybercog/php-svg-font"
         }
     ],
     "require": {
         "php": ">=7.4",
         "ext-gd": "*",
         "ext-simplexml": "*",
+        "cybercog/php-svg-font": "*",
         "kartsims/easysvg": "^2.4",
         "symfony/console": "^4.0|^5.0|^6.0"
     },
@@ -69,5 +74,7 @@
         "branch-alias": {
             "dev-master": "2.x-dev"
         }
-    }
+    },
+    "minimum-stability": "dev",
+    "prefer-stable": true
 }
diff --git a/src/Calculator/SvgTextSizeCalculator.php b/src/Calculator/SvgTextSizeCalculator.php
index da18561..3bc3a03 100644
--- a/src/Calculator/SvgTextSizeCalculator.php
+++ b/src/Calculator/SvgTextSizeCalculator.php
@@ -11,6 +11,10 @@
 
 namespace PUGX\Poser\Calculator;
 
+use Cog\SvgFont\Font;
+use Cog\SvgFont\Parser\SimpleXmlSvgFontFileParser;
+use Cog\Unicode\UnicodeString;
+
 /**
  * @author Anton Komarev <anton@komarev.com>
  */
@@ -25,25 +29,38 @@ class SvgTextSizeCalculator implements TextSizeCalculatorInterface
      */
     public function calculateWidth(string $text, int $size = self::TEXT_SIZE): float
     {
-        $font = SvgFont::fromFile(__DIR__ . '/Font/DejaVuSans.svg');
+        $font = (new SimpleXmlSvgFontFileParser())
+            ->parseFile(__DIR__ . '/DejaVuSans.svg')
+            ->getById('DejaVuSansBook');
+
+        $width = $this->computeTextWidth(
+            $font,
+            $text,
+            $size,
+        );
 
-        $textUnicode = TextUnicodeConverter::convertTextToCodePoints($text);
+        return \round($width + self::SHIELD_PADDING, 1);
+    }
 
-        $width     = 0;
-        $lineWidth = 0;
+    private function computeTextWidth(
+        Font $font,
+        string $text,
+        int $fontSize
+    ): float {
+        $characterList = UnicodeString::of($text)->characterList();
 
-        foreach ($textUnicode as $unicodeCodePoint) {
-            if (self::UNICODE_CODE_POINT_LINE_FEED === $unicodeCodePoint) {
-                $width     = \max($width, $lineWidth);
-                $lineWidth = 0;
+        $maxLineWidth = $lineWidth = 0;
+
+        foreach ($characterList as $character) {
+            if ($character->toDecimal() === self::UNICODE_CODE_POINT_LINE_FEED) {
+                $maxLineWidth = max($maxLineWidth, $lineWidth);
+                $lineWidth    = 0;
                 continue;
             }
 
-            $lineWidth += $font->computeWidth($unicodeCodePoint, $size);
+            $lineWidth += $font->computeWidth($character, $fontSize);
         }
 
-        $width = \max($width, $lineWidth);
-
-        return \round($width + self::SHIELD_PADDING, 1);
+        return max($maxLineWidth, $lineWidth);
     }
 }