diff --git a/resources/php-epub-meta/composer.json b/resources/php-epub-meta/composer.json
index 83a1d711a..d56878cd2 100644
--- a/resources/php-epub-meta/composer.json
+++ b/resources/php-epub-meta/composer.json
@@ -20,9 +20,10 @@
     ],
     "license": "MIT",
     "require": {
+        "ext-dom": "*",
         "ext-xml": "*",
         "ext-zip": "*",
-        "seblucas/tbszip": "~2.16.0"
+        "seblucas/tbszip": "~2.16.1"
     },
     "require-dev": {
         "phpunit/phpunit": "9.*"
diff --git a/resources/php-epub-meta/composer.lock b/resources/php-epub-meta/composer.lock
index ce8cc5bae..888ee1d97 100644
--- a/resources/php-epub-meta/composer.lock
+++ b/resources/php-epub-meta/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": "19ed89d1bc9d4901ffc817cd6eb6434b",
+    "content-hash": "4277e962da8ebff636eac1799d4c524f",
     "packages": [
         {
             "name": "seblucas/tbszip",
@@ -680,16 +680,16 @@
         },
         {
             "name": "phpunit/phpunit",
-            "version": "9.6.5",
+            "version": "9.6.6",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/phpunit.git",
-                "reference": "86e761949019ae83f49240b2f2123fb5ab3b2fc5"
+                "reference": "b65d59a059d3004a040c16a82e07bbdf6cfdd115"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/86e761949019ae83f49240b2f2123fb5ab3b2fc5",
-                "reference": "86e761949019ae83f49240b2f2123fb5ab3b2fc5",
+                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/b65d59a059d3004a040c16a82e07bbdf6cfdd115",
+                "reference": "b65d59a059d3004a040c16a82e07bbdf6cfdd115",
                 "shasum": ""
             },
             "require": {
@@ -762,7 +762,8 @@
             ],
             "support": {
                 "issues": "https://github.com/sebastianbergmann/phpunit/issues",
-                "source": "https://github.com/sebastianbergmann/phpunit/tree/9.6.5"
+                "security": "https://github.com/sebastianbergmann/phpunit/security/policy",
+                "source": "https://github.com/sebastianbergmann/phpunit/tree/9.6.6"
             },
             "funding": [
                 {
@@ -778,7 +779,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2023-03-09T06:34:10+00:00"
+            "time": "2023-03-27T11:43:46+00:00"
         },
         {
             "name": "sebastian/cli-parser",
@@ -1801,6 +1802,7 @@
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {
+        "ext-dom": "*",
         "ext-xml": "*",
         "ext-zip": "*"
     },
diff --git a/resources/php-epub-meta/lib/EPub.php b/resources/php-epub-meta/lib/EPub.php
index 7f0042459..c5b02a219 100644
--- a/resources/php-epub-meta/lib/EPub.php
+++ b/resources/php-epub-meta/lib/EPub.php
@@ -6,10 +6,9 @@
  * @author Sébastien Lucas <sebastien@slucas.fr>
  */
 
-define('METADATA_FILE', 'META-INF/container.xml');
-
 class EPub
 {
+    public const METADATA_FILE = 'META-INF/container.xml';
     public $xml; //FIXME: change to protected, later
     public $toc;
     protected $xpath;
@@ -38,11 +37,11 @@ public function __construct($file, $zipClass = 'clsTbsZip')
         }
 
         // read container data
-        if (!$this->zip->FileExists(METADATA_FILE)) {
+        if (!$this->zip->FileExists(self::METADATA_FILE)) {
             throw new Exception('Unable to find metadata.xml');
         }
 
-        $data = $this->zip->FileRead(METADATA_FILE);
+        $data = $this->zip->FileRead(self::METADATA_FILE);
         if ($data == false) {
             throw new Exception('Failed to access epub container data');
         }