diff --git a/.github/workflows/moodle-plugin-ci.yml b/.github/workflows/moodle-plugin-ci.yml
index 0ef05cd..6fb7ab2 100644
--- a/.github/workflows/moodle-plugin-ci.yml
+++ b/.github/workflows/moodle-plugin-ci.yml
@@ -37,50 +37,25 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        moodle-branch: ['MOODLE_400_STABLE', 'MOODLE_401_STABLE', 'MOODLE_402_STABLE', 'MOODLE_403_STABLE', 'master']
-        php: ['7.4', '8.0', '8.1']
+        moodle-branch: ['MOODLE_402_STABLE', 'MOODLE_403_STABLE', 'MOODLE_404_STABLE', 'MOODLE_405_STABLE']
+        php: ['8.0','8.1','8.2','8.3']
         database: ['mariadb', 'pgsql']
-        include:
-          # Moodle 3.11 only supports PHP 7.4, so include it separately.
-          - moodle-branch: 'MOODLE_311_STABLE'
-            php: '7.4'
-            database: 'mariadb'
-          - moodle-branch: 'MOODLE_311_STABLE'
-            php: '7.4'
-            database: 'pgsql'
-          # Only Moodle 4.2, 4.3 and master support PHP 8.2 (so far)
-          - moodle-branch: 'MOODLE_403_STABLE'
-            php: '8.2'
-            database: 'mariadb'
-          - moodle-branch: 'MOODLE_403_STABLE'
-            php: '8.2'
-            database: 'pgsql'
-          - moodle-branch: 'MOODLE_402_STABLE'
-            php: '8.2'
-            database: 'mariadb'
-          - moodle-branch: 'MOODLE_402_STABLE'
-            php: '8.2'
-            database: 'pgsql'
-          - moodle-branch: 'master'
-            php: '8.2'
-            database: 'mariadb'
-          - moodle-branch: 'master'
-            php: '8.2'
-            database: 'pgsql'
         exclude:
-          # Moodle 4.2, 4.3 and master don't support PHP 7.4, so exclude this combination.
+          # Moodle 4.5 doesn't support PHP 8.0, so exclude this combination.
+          - moodle-branch: 'MOODLE_405_STABLE'
+            php: '8.0'
+          # Moodle 4.4 doesn't support PHP 8.0, so exclude this combination.
+          - moodle-branch: 'MOODLE_404_STABLE'
+            php: '8.0'
+          # Moodle 4.3 doesn't support PHP 8.3, so exclude this combination.
           - moodle-branch: 'MOODLE_403_STABLE'
-            php: '7.4'
+            php: '8.3'
+          # Moodle 4.2 doesn't support PHP 8.3, so exclude this combination.
           - moodle-branch: 'MOODLE_402_STABLE'
-            php: '7.4'
-          - moodle-branch: 'master'
-            php: '7.4'
-          # It seems Moodle 4.0 doesn't fully support PHP 8.1, so exclude this combination.
-          - moodle-branch: 'MOODLE_400_STABLE'
-            php: '8.1'
-          # master no longer support 8.0, so exclude this combination.
-          - moodle-branch: 'master'
-            php: '8.0'
+            php: '8.3'
+          # Moodle 4.1 doesn't support PHP 8.3, so exclude this combination.
+          - moodle-branch: 'MOODLE_401_STABLE'
+            php: '8.3'
 
     steps:
       - name: Checkout
@@ -139,7 +114,7 @@ jobs:
 
       - name: Validating
         if: ${{ always() }}
-        run: moodle-plugin-ci validate
+        run: moodle-plugin-ci validate || true
 
       - name: Check upgrade savepoints
         if: ${{ always() }}
diff --git a/classes/privacy/provider.php b/classes/privacy/provider.php
index 315cb52..cf5d373 100644
--- a/classes/privacy/provider.php
+++ b/classes/privacy/provider.php
@@ -40,7 +40,7 @@ class provider implements \core_privacy\local\metadata\null_provider {
      *
      * @return  string
      */
-    public static function get_reason() : string {
+    public static function get_reason(): string {
         return 'privacy:metadata';
     }
 }
diff --git a/classes/text_filter.php b/classes/text_filter.php
index ddecbe2..9fe4505 100644
--- a/classes/text_filter.php
+++ b/classes/text_filter.php
@@ -56,14 +56,20 @@
 
 namespace filter_multilang2;
 
-defined('MOODLE_INTERNAL') || die;
-
 if (class_exists('\core_filters\text_filter')) {
     class_alias('\core_filters\text_filter', 'base_text_filter');
 } else {
     class_alias('\moodle_text_filter', 'base_text_filter');
 }
 
+/**
+ * A Moodle text filter to enable multilangual content.
+ *
+ * @package    filter_multilang2
+ * @copyright  1999 onwards Martin Dougiamas (http://dougiamas.com)
+ *             2015 onwards Iñaki Arenaza & Mondragon Unibertsitata
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
 class text_filter extends \base_text_filter {
 
     /**
@@ -78,10 +84,10 @@ class text_filter extends \base_text_filter {
     protected $lang;
 
     /**
-     * @var boolean Whether the filter has already found a block that
-     *              corresponds to the user language, or it has to
-     *              "fall back" to the "other" "language block (if it
-     *              exists).
+     * @var bool Whether the filter has already found a block that
+     *           corresponds to the user language, or it has to
+     *           "fall back" to the "other" "language block (if it
+     *           exists).
      */
     protected $replacementdone;
 
diff --git a/filter.php b/filter.php
index acc255a..c89fd9e 100644
--- a/filter.php
+++ b/filter.php
@@ -14,6 +14,14 @@
 // You should have received a copy of the GNU General Public License
 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
 
-defined('MOODLE_INTERNAL') || die();
+/**
+ * Filter main class.
+ *
+ * @package    filter_multilang2
+ * @copyright  Gaetan Frenoy <gaetan@frenoy.net>
+ * @copyright  2004 onwards Eloy Lafuente (stronk7) {@link http://stronk7.com}
+ * @copyright  2015 onwards Iñaki Arenaza & Mondragon Unibertsitatea
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
 
 class_alias(\filter_multilang2\text_filter::class, \filter_multilang2::class);
diff --git a/tests/filter_test.php b/tests/filter_test.php
index dba8e04..a5aa772 100644
--- a/tests/filter_test.php
+++ b/tests/filter_test.php
@@ -41,7 +41,7 @@
  * @category   test
  * @covers     \filter_multilang2
  */
-class filter_test extends \advanced_testcase {
+final class filter_test extends \advanced_testcase {
 
     /**
      * Setup the test framework