diff --git a/Classes/EventListener/RteConfigEnhancer.php b/Classes/EventListener/RteConfigEnhancer.php
new file mode 100644
index 0000000..79a13f9
--- /dev/null
+++ b/Classes/EventListener/RteConfigEnhancer.php
@@ -0,0 +1,32 @@
+<?php
+
+/*
+ * This file is part of the package bk2k/syntax.
+ *
+ * For the full copyright and license information, please read the
+ * LICENSE file that was distributed with this source code.
+ */
+
+namespace BK2K\Syntax\EventListener;
+
+use TYPO3\CMS\RteCKEditor\Form\Element\Event\BeforeGetExternalPluginsEvent;
+use TYPO3\CMS\RteCKEditor\Form\Element\Event\BeforePrepareConfigurationForEditorEvent;
+
+class RteConfigEnhancer
+{
+    public function beforeGetExternalPlugins(BeforeGetExternalPluginsEvent $event): void
+    {
+        $configuration = $event->getConfiguration();
+        $configuration['syntax_code'] = [
+            'resource' => 'EXT:syntax/Resources/Public/CKEditor/Plugins/Code/plugin.js'
+        ];
+        $event->setConfiguration($configuration);
+    }
+
+    public function beforePrepareConfiguration(BeforePrepareConfigurationForEditorEvent $event): void
+    {
+        $configuration = $event->getConfiguration();
+        $configuration['extraPlugins'][] = 'syntax_code';
+        $event->setConfiguration($configuration);
+    }
+}
diff --git a/Configuration/Services.yaml b/Configuration/Services.yaml
new file mode 100644
index 0000000..8e25db8
--- /dev/null
+++ b/Configuration/Services.yaml
@@ -0,0 +1,11 @@
+services:
+  BK2K\Syntax\EventListener\RteConfigEnhancer:
+    tags:
+      - name: event.listener
+        identifier: 'ext-syntax/rteConfigEnhancer'
+        method: 'beforeGetExternalPlugins'
+        event: TYPO3\CMS\RteCKEditor\Form\Element\Event\BeforeGetExternalPluginsEvent
+      - name: event.listener
+        identifier: 'ext-syntax/rteConfigEnhancer'
+        method: 'beforePrepareConfiguration'
+        event: TYPO3\CMS\RteCKEditor\Form\Element\Event\BeforePrepareConfigurationForEditorEvent
diff --git a/Resources/Public/CKEditor/Plugins/Code/dialogs/code.js b/Resources/Public/CKEditor/Plugins/Code/dialogs/code.js
new file mode 100644
index 0000000..bd2de45
--- /dev/null
+++ b/Resources/Public/CKEditor/Plugins/Code/dialogs/code.js
@@ -0,0 +1,88 @@
+CKEDITOR.dialog.add('code', function () {
+
+    var clientHeight = document.documentElement.clientHeight;
+    var size = CKEDITOR.document.getWindow().getViewPaneSize();
+    var width = Math.min(size.width - 70, 800);
+    var height = size.height / 2;
+
+    if (clientHeight < 650) {
+        height = clientHeight - 220;
+    }
+
+    return {
+        title: 'Code',
+        minWidth: 200,
+        minHeight: 100,
+        contents: [
+            {
+                id: 'info',
+                elements: [
+                    {
+                        id: 'lang',
+                        type: 'select',
+                        label: 'Language',
+                        items: [
+                            ['None', 'language-none'],
+                            ['Apache Configuration', 'language-apacheconf'],
+                            ['C-like', 'language-clike'],
+                            ['CSS', 'language-css'],
+                            ['Git', 'language-git'],
+                            ['HTML', 'language-html'],
+                            ['JavaScript', 'language-javascript'],
+                            ['JSON', 'language-json'],
+                            ['Markup ', 'language-markup'],
+                            ['Less', 'language-less'],
+                            ['Markdown', 'language-markdown'],
+                            ['MathML', 'language-mathml'],
+                            ['nginx', 'language-nginx'],
+                            ['PHP', 'language-php'],
+                            ['Sass', 'language-sass'],
+                            ['Scss', 'language-scss'],
+                            ['SVG', 'language-svg'],
+                            ['TypoScript', 'language-typoscript'],
+                            ['XML', 'language-xml'],
+                            ['YAML', 'language-yaml'],
+                        ],
+                        setup: function (widget) {
+                            this.setValue(widget.data.lang);
+                        },
+                        commit: function (widget) {
+                            widget.setData('lang', this.getValue());
+                        }
+                    },
+                    {
+                        id: 'linenumbers',
+                        type: 'checkbox',
+                        label: 'Linenumbers',
+                        default: true,
+                        setup: function (widget) {
+                            this.setValue(widget.data.linenumbers);
+                        },
+                        commit: function (widget) {
+                            widget.setData('linenumbers', this.getValue());
+                        }
+                    },
+                    {
+                        id: 'code',
+                        type: 'textarea',
+                        label: 'Code',
+                        setup: function (widget) {
+                            this.setValue(widget.data.code);
+                        },
+                        commit: function (widget) {
+                            widget.setData('code', this.getValue());
+                        },
+                        required: true,
+                        validate: CKEDITOR.dialog.validate.notEmpty('Code cannot be empty.'),
+                        inputStyle: 'cursor:auto;' +
+                            'tab-size:4;' +
+                            'width:' + width + 'px;' +
+                            'height:' + height + 'px;' +
+                            'padding: 1em;' +
+                            'text-align:left;',
+                    }
+                ]
+            }
+        ]
+    };
+});
diff --git a/Resources/Public/CKEditor/Plugins/Code/icons/code.png b/Resources/Public/CKEditor/Plugins/Code/icons/code.png
new file mode 100644
index 0000000..f5caa14
Binary files /dev/null and b/Resources/Public/CKEditor/Plugins/Code/icons/code.png differ
diff --git a/Resources/Public/CKEditor/Plugins/Code/icons/hidpi/code.png b/Resources/Public/CKEditor/Plugins/Code/icons/hidpi/code.png
new file mode 100644
index 0000000..245c5ad
Binary files /dev/null and b/Resources/Public/CKEditor/Plugins/Code/icons/hidpi/code.png differ
diff --git a/Resources/Public/CKEditor/Plugins/Code/lang/de.js b/Resources/Public/CKEditor/Plugins/Code/lang/de.js
new file mode 100644
index 0000000..345f73e
--- /dev/null
+++ b/Resources/Public/CKEditor/Plugins/Code/lang/de.js
@@ -0,0 +1,3 @@
+CKEDITOR.plugins.setLang('syntax_code', 'de', {
+    toolbar: 'Code einfügen'
+});
diff --git a/Resources/Public/CKEditor/Plugins/Code/lang/en.js b/Resources/Public/CKEditor/Plugins/Code/lang/en.js
new file mode 100644
index 0000000..ff6b6ed
--- /dev/null
+++ b/Resources/Public/CKEditor/Plugins/Code/lang/en.js
@@ -0,0 +1,3 @@
+CKEDITOR.plugins.setLang('syntax_code', 'en', {
+    toolbar: 'Insert Code'
+});
diff --git a/Resources/Public/CKEditor/Plugins/Code/plugin.js b/Resources/Public/CKEditor/Plugins/Code/plugin.js
new file mode 100644
index 0000000..7825c62
--- /dev/null
+++ b/Resources/Public/CKEditor/Plugins/Code/plugin.js
@@ -0,0 +1,72 @@
+'use strict';
+
+(function () {
+
+    CKEDITOR.plugins.add('syntax_code', {
+        lang: 'en,de',
+        requires: 'widget,dialog',
+        icons: 'code',
+        hidpi: true,
+        onLoad: function () {
+            CKEDITOR.dialog.add('code', this.path + 'dialogs/code.js');
+        },
+        init: function (editor) {
+            editor.addContentsCss(this.path + 'styles/code.css');
+            editor.widgets.add('code', {
+                button: 'Insert Code Block',
+                template: '<pre><code class="language-none"></code></pre>',
+                parts: {
+                    pre: 'pre',
+                    code: 'code'
+                },
+                allowedContent: 'pre(line-numbers); code(language-*)',
+                requiredContent: 'pre',
+                styleableElements: 'pre',
+                dialog: 'code',
+                mask: true,
+                upcast: function (element) {
+                    if (element.name != 'pre') {
+                        return;
+                    }
+                    var children = element.children.filter(
+                        child => child.type != CKEDITOR.NODE_TEXT
+                    );
+                    if (children.length != 1 || children[0].name != 'code') {
+                        return;
+                    }
+                    var code = children[0];
+                    if (code.children.length != 1 || code.children[0].type != CKEDITOR.NODE_TEXT) {
+                        return;
+                    }
+                    return element;
+                },
+                downcast: function (element) {
+                    var code = element.getFirst('code');
+                    code.children.length = 0;
+                    code.add(new CKEDITOR.htmlParser.text(CKEDITOR.tools.htmlEncode(this.data.code)));
+                    return element;
+                },
+                init: function () {
+                    this.data.code = CKEDITOR.tools.htmlDecode(this.parts.code.getHtml());
+                    this.data.lang = this.parts.code.getAttribute('class') ?? 'language-none';
+                    this.data.linenumbers = this.parts.pre.hasClass('line-numbers');
+                },
+                data: function () {
+                    if (this.data.lang) {
+                        this.parts.code.removeAttribute(['class'])
+                        this.parts.code.addClass(this.data.lang);
+                    }
+                    if (this.data.linenumbers) {
+                        this.parts.pre.addClass('line-numbers');
+                    } else {
+                        this.parts.pre.removeClass('line-numbers');
+                    }
+                    if (this.data.code) {
+                        this.parts.code.setHtml(CKEDITOR.tools.htmlEncode(this.data.code));
+                    }
+                }
+            });
+        }
+    });
+
+})();
diff --git a/Resources/Public/CKEditor/Plugins/Code/styles/code.css b/Resources/Public/CKEditor/Plugins/Code/styles/code.css
new file mode 100644
index 0000000..3b363d3
--- /dev/null
+++ b/Resources/Public/CKEditor/Plugins/Code/styles/code.css
@@ -0,0 +1,6 @@
+.cke_widget_code pre {
+    padding: 1rem;
+    background-color: #f2f2f2;
+    border: 1px solid #cacaca;
+    border-radius: 3px;
+}
diff --git a/composer.json b/composer.json
index 363d221..1a92bb2 100644
--- a/composer.json
+++ b/composer.json
@@ -27,7 +27,8 @@
         "php": ">=7.0.0",
         "typo3/cms-backend": "^8.7 || ^9.5 || ^10.0 || 10.*@dev",
         "typo3/cms-core": "^8.7 || ^9.5 || ^10.0 || 10.*@dev",
-        "typo3/cms-frontend": "^8.7 || ^9.5 || ^10.0 || 10.*@dev"
+        "typo3/cms-frontend": "^8.7 || ^9.5 || ^10.0 || 10.*@dev",
+        "typo3/cms-rte-ckeditor": "^8.7 || ^9.5 || ^10.0 || 10.*@dev"
     },
     "require-dev": {
         "friendsofphp/php-cs-fixer": "^2.3.1",
diff --git a/ext_emconf.php b/ext_emconf.php
index 7df7fb7..47806ad 100644
--- a/ext_emconf.php
+++ b/ext_emconf.php
@@ -13,8 +13,8 @@
     'category' => 'templates',
     'constraints' => [
         'depends' => [
-            'typo3' => '8.7.0-10.0.99',
-            'rte_ckeditor' => '8.7.0-10.0.99'
+            'typo3' => '8.7.0-10.4.99',
+            'rte_ckeditor' => '8.7.0-10.4.99'
         ]
     ],
     'autoload' => [