diff --git a/composer.lock b/composer.lock
index b4213a825b..1c8c7fc2ab 100644
--- a/composer.lock
+++ b/composer.lock
@@ -792,16 +792,16 @@
         },
         {
             "name": "dompdf/dompdf",
-            "version": "v3.1.0",
+            "version": "v3.1.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/dompdf/dompdf.git",
-                "reference": "a51bd7a063a65499446919286fb18b518177155a"
+                "reference": "794ec856134a73d2a69a474c5d4faa47e1e645b1"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/dompdf/dompdf/zipball/a51bd7a063a65499446919286fb18b518177155a",
-                "reference": "a51bd7a063a65499446919286fb18b518177155a",
+                "url": "https://api.github.com/repos/dompdf/dompdf/zipball/794ec856134a73d2a69a474c5d4faa47e1e645b1",
+                "reference": "794ec856134a73d2a69a474c5d4faa47e1e645b1",
                 "shasum": ""
             },
             "require": {
@@ -850,9 +850,9 @@
             "homepage": "https://github.com/dompdf/dompdf",
             "support": {
                 "issues": "https://github.com/dompdf/dompdf/issues",
-                "source": "https://github.com/dompdf/dompdf/tree/v3.1.0"
+                "source": "https://github.com/dompdf/dompdf/tree/v3.1.1"
             },
-            "time": "2025-01-15T14:09:04+00:00"
+            "time": "2025-09-20T17:30:31+00:00"
         },
         {
             "name": "dompdf/php-font-lib",
diff --git a/src/PhpSpreadsheet/Writer/Pdf/Dompdf.php b/src/PhpSpreadsheet/Writer/Pdf/Dompdf.php
index c52fe64805..bad31ce5ff 100644
--- a/src/PhpSpreadsheet/Writer/Pdf/Dompdf.php
+++ b/src/PhpSpreadsheet/Writer/Pdf/Dompdf.php
@@ -44,13 +44,6 @@ public function save($filename, int $flags = 0): void
         $orientation = ($orientation == 'L') ? 'landscape' : 'portrait';
 
         //  Create PDF
-        $restoreHandler = false;
-        if (PHP_VERSION_ID >= self::$temporaryVersionCheck) {
-            // @codeCoverageIgnoreStart
-            set_error_handler(self::specialErrorHandler(...));
-            $restoreHandler = true;
-            // @codeCoverageIgnoreEnd
-        }
         $pdf = $this->createExternalWriterInstance();
         $pdf->setPaper($paperSize, $orientation);
 
@@ -58,29 +51,8 @@ public function save($filename, int $flags = 0): void
         $pdf->render();
 
         //  Write to file
-        fwrite($fileHandle, $pdf->output() ?? '');
+        fwrite($fileHandle, $pdf->output());
 
-        if ($restoreHandler) {
-            restore_error_handler(); // @codeCoverageIgnore
-        }
         parent::restoreStateAfterSave();
     }
-
-    protected static int $temporaryVersionCheck = 80500;
-
-    /**
-     * Temporary handler for Php8.5 waiting for Dompdf release.
-     *
-     * @codeCoverageIgnore
-     */
-    public function specialErrorHandler(int $errno, string $errstr, string $filename, int $lineno): bool
-    {
-        if ($errno === E_DEPRECATED) {
-            if (preg_match('/canonical|imagedestroy|http_get_last_response_headers|Using null as an array offset/', $errstr) === 1) {
-                return true;
-            }
-        }
-
-        return false; // continue error handling
-    }
 }