diff --git a/src/Exceptions/Handlers/LegacyDevelopment.php b/src/Exceptions/Handlers/LegacyDevelopment.php
index 34c52571..335ce87c 100644
--- a/src/Exceptions/Handlers/LegacyDevelopment.php
+++ b/src/Exceptions/Handlers/LegacyDevelopment.php
@@ -26,7 +26,13 @@ class LegacyDevelopment extends Legacy
             'file'       => $file . ':' . $e->getLine(),
             'stacktrace' => $this->formatStackTrace($e->getTrace()),
         ];
+
+        ob_start(function (string $buffer) {
+            return htmlspecialchars($buffer);
+        });
         var_dump($data);
+        ob_end_flush();
+
         echo '</pre>';
     }
 
diff --git a/tests/Unit/Exceptions/Handlers/LegacyDevelopmentTest.php b/tests/Unit/Exceptions/Handlers/LegacyDevelopmentTest.php
index f7355f76..fb929459 100644
--- a/tests/Unit/Exceptions/Handlers/LegacyDevelopmentTest.php
+++ b/tests/Unit/Exceptions/Handlers/LegacyDevelopmentTest.php
@@ -19,10 +19,10 @@ class LegacyDevelopmentTest extends TestCase
         $handler = new LegacyDevelopment();
         /** @var Request|MockObject $request */
         $request = $this->createMock(Request::class);
-        $exception = new ErrorException('Lorem Ipsum', 4242, 1, 'foo.php', 9999);
+        $exception = new ErrorException('Lorem <b>Ipsum</b>', 4242, 1, 'foo.php', 9999);
 
         $regex = sprintf(
-            '%%<pre.*>.*ErrorException.*4242.*Lorem Ipsum.*%s.*%s.*%s.*</pre>%%is',
+            '%%<pre.*>.*ErrorException.*4242.*Lorem &lt;b&gt;Ipsum&lt;/b&gt;.*%s.*%s.*%s.*</pre>%%is',
             'foo.php',
             9999,
             __FUNCTION__