diff --git a/.forgejo/workflows/phpunit.yml b/.forgejo/workflows/phpunit.yml
index 3e6d9f7..f8e08ac 100644
--- a/.forgejo/workflows/phpunit.yml
+++ b/.forgejo/workflows/phpunit.yml
@@ -22,6 +22,7 @@ jobs:
     strategy:
       matrix:
         php-version: ['7.4', '8.0', '8.1', '8.2', '8.3']
+        wordpress-version: ['6.7']
     name: PHPUnit – PHP ${{ matrix.php-version }}
     env:
       extensions: mysql
@@ -37,7 +38,7 @@ jobs:
           path: |
             ${{ env.WP_CORE_DIR }}
             ${{ env.WP_TESTS_DIR }}
-          key: cache-wordpress-9
+          key: cache-wordpress-67-2
 
       - name: Cache Composer
         id: cache-composer-phpunit
@@ -68,11 +69,11 @@ jobs:
 
       - name: Setup Test Environment
         if: steps.cache-wordpress.outputs.cache-hit != 'true'
-        run: bash bin/install-wp-tests.sh wordpress_test root root 127.0.0.1 6.6 false false false false
+        run: bash bin/install-wp-tests.sh wordpress_test root root 127.0.0.1 ${{ matrix.wordpress-version }} false false false false
 
       - name: Initialize WordPress test database
         if: steps.cache-wordpress.outputs.cache-hit != 'false'
-        run: bash bin/install-wp-tests.sh wordpress_test root root 127.0.0.1 6.6 false true true true
+        run: bash bin/install-wp-tests.sh wordpress_test root root 127.0.0.1 ${{ matrix.wordpress-version }} false true true true
 
       - name: Run Integration tests for The Events Calendar
         run: cd /workspace/Event-Federation/wordpress-activitypub-event-bridge/ && ./vendor/bin/phpunit --filter=the_events_calendar
diff --git a/README.md b/README.md
index 2a8553d..c546212 100644
--- a/README.md
+++ b/README.md
@@ -2,8 +2,8 @@
 **Contributors:** [andremenrath](https://profiles.wordpress.org/andremenrath/)  
 **Tags:** events, fediverse, activitypub, calendar  
 **Requires at least:** 6.5  
-**Tested up to:** 6.6  
-**Stable tag:** 0.2.0  
+**Tested up to:** 6.7  
+**Stable tag:** 0.2.1  
 **Requires PHP:** 7.4  
 **License:** AGPL-3.0-or-later  
 **License URI:** https://www.gnu.org/licenses/agpl-3.0.html  
@@ -73,6 +73,7 @@ If you're new to the [ActivityPub plugin](https://wordpress.org/plugins/activity
 ### Do I need to install another event plugin to use the Event Federation Plugin? ###
 
 Yes, this plugin works as an add-on and requires both the ActivityPub plugin and a supported event plugin such as The Events Calendar, VS Event List, or Events Manager to manage your events. It just fills the missing gap between event plugins and the [ActivityPub plugin](https://wordpress.org/plugins/activitypub/).
+
 ### What platforms can follow my events? ###
 
 Your events can be followed on platforms that support ActivityPub like [Mobilizon](https://joinmobilizon.org/), [Gancio](https://gancio.org), [Friendica](https://friendi.ca), [Hubzilla](https://hubzilla.org), and [Pleroma](https://pleroma.social/). Even other applications like [Mastodon](https://joinmastodon.org), which don't fully support events yet, will display all important information about the events.
diff --git a/activitypub-event-bridge.php b/activitypub-event-bridge.php
index 4278457..961af39 100644
--- a/activitypub-event-bridge.php
+++ b/activitypub-event-bridge.php
@@ -3,7 +3,7 @@
  * Plugin Name:  ActivityPub Event Bridge
  * Description:  Integrating popular event plugins with the ActivityPub plugin.
  * Plugin URI:   https://event-federation.eu/
- * Version:      0.2.0
+ * Version:      0.2.1
  * Author:       André Menrath
  * Author URI:   https://graz.social/@linos
  * Text Domain:  activitypub-event-bridge
@@ -11,7 +11,7 @@
  * License URI:  https://www.gnu.org/licenses/agpl-3.0.html
  * Requires PHP: 7.4
  *
- * Requires at least ActivityPub plugin with version >= 3.2.2. ActivityPub plugin tested up to: 4.0.1.
+ * Requires at least ActivityPub plugin with version >= 3.2.2. ActivityPub plugin tested up to: 4.2.0.
  *
  * @package ActivityPub_Event_Bridge
  * @license AGPL-3.0-or-later
diff --git a/bin/install-wp-tests.sh b/bin/install-wp-tests.sh
index f0bf333..3cc440f 100755
--- a/bin/install-wp-tests.sh
+++ b/bin/install-wp-tests.sh
@@ -208,9 +208,15 @@ install_wp_plugin() {
 	fi
 
 	# Get the latest tag.
-    LATEST_TAG=$(svn log https://plugins.svn.wordpress.org/$PLUGIN_NAME/tags --limit 1 | awk 'NR == 4 { print $4 }')
-	if [ -n "$LATEST_TAG" ]; then
-		PLUGIN_FILE="$PLUGIN_NAME.$LATEST_TAG.zip"
+	if [ -z "$2" ]; then
+		LATEST_TAG=$(svn log https://plugins.svn.wordpress.org/$PLUGIN_NAME/tags --limit 1 | awk 'NR == 4 { print $4 }')
+		PLUGIN_VERSION=$LATEST_TAG
+	else
+		PLUGIN_VERSION=$2
+	fi
+	
+	if [ -n "$PLUGIN_VERSION" ]; then
+		PLUGIN_FILE="$PLUGIN_NAME.$PLUGIN_VERSION.zip"
 	else
 		PLUGIN_FILE="$PLUGIN_NAME.zip"
 	fi
@@ -248,12 +254,12 @@ install_wp_plugins() {
 	# Install the one and only ActivityPub plugin (greetings @pfefferle).
 	install_wp_plugin activitypub
 	# Install (not-activate) all supported event plugins.
-	install_wp_plugin the-events-calendar
+	install_wp_plugin the-events-calendar "6.8.1"
 	install_wp_plugin very-simple-event-list
 	install_wp_plugin gatherpress
-	install_wp_plugin events-manager
-	install_wp_plugin wp-event-manager
-	install_wp_plugin wp-event-solution
+	install_wp_plugin events-manager "6.6.3"
+	install_wp_plugin wp-event-manager "3.1.45.1"
+	install_wp_plugin wp-event-solution "4.0.14"
 	# Mec is not installable via wordpress.org, we use our own mirror.
 	install_wp_plugin_mec
 }
diff --git a/includes/plugins/class-modern-events-calendar-lite.php b/includes/plugins/class-modern-events-calendar-lite.php
index 796634d..45f060f 100644
--- a/includes/plugins/class-modern-events-calendar-lite.php
+++ b/includes/plugins/class-modern-events-calendar-lite.php
@@ -38,7 +38,7 @@ final class Modern_Events_Calendar_Lite extends Event_plugin {
 	 */
 	public static function get_post_type(): string {
 		// See MEC_feature_events->get_main_post_type().
-		return apply_filters( 'mec_post_type_name', 'mec-events' ); // phpcs:ignore
+		return 'mec-events';
 	}
 
 	/**
diff --git a/readme.txt b/readme.txt
index df031ea..caedf64 100644
--- a/readme.txt
+++ b/readme.txt
@@ -2,8 +2,8 @@
 Contributors: andremenrath
 Tags: events, fediverse, activitypub, calendar
 Requires at least: 6.5
-Tested up to: 6.6
-Stable tag: 0.2.0
+Tested up to: 6.7
+Stable tag: 0.2.1
 Requires PHP: 7.4
 License: AGPL-3.0-or-later
 License URI: https://www.gnu.org/licenses/agpl-3.0.html
@@ -67,6 +67,7 @@ If you're new to the [ActivityPub plugin](https://wordpress.org/plugins/activity
 = Do I need to install another event plugin to use the Event Federation Plugin? =
 
 Yes, this plugin works as an add-on and requires both the ActivityPub plugin and a supported event plugin such as The Events Calendar, VS Event List, or Events Manager to manage your events. It just fills the missing gap between event plugins and the [ActivityPub plugin](https://wordpress.org/plugins/activitypub/).
+
 = What platforms can follow my events? =
 
 Your events can be followed on platforms that support ActivityPub like [Mobilizon](https://joinmobilizon.org/), [Gancio](https://gancio.org), [Friendica](https://friendi.ca), [Hubzilla](https://hubzilla.org), and [Pleroma](https://pleroma.social/). Even other applications like [Mastodon](https://joinmastodon.org), which don't fully support events yet, will display all important information about the events.
diff --git a/templates/admin-header.php b/templates/admin-header.php
index efc02bc..4ee283b 100644
--- a/templates/admin-header.php
+++ b/templates/admin-header.php
@@ -5,6 +5,9 @@
  * @package ActivityPub_Event_Bridge
  */
 
+// Exit if accessed directly.
+defined( 'ABSPATH' ) || exit; // @codeCoverageIgnore
+
 /* @var array $args Template arguments. */
 $args = wp_parse_args(
 	$args,