diff --git a/phpstan.neon.dist b/phpstan.neon.dist
index 3812e72..f8f6daf 100644
--- a/phpstan.neon.dist
+++ b/phpstan.neon.dist
@@ -3,6 +3,7 @@ includes:
 
 parameters:
     level: 4
+    checkMissingOverrideMethodAttribute: true
     paths:
         - .
     excludePaths:
diff --git a/src/ExtensionInstaller.php b/src/ExtensionInstaller.php
index 3ea5a77..b4272ac 100644
--- a/src/ExtensionInstaller.php
+++ b/src/ExtensionInstaller.php
@@ -67,6 +67,7 @@ protected function getRoundcubemailInstallPath(): string
         return $this->roundcubemailInstallPath;
     }
 
+    #[\Override]
     public function getInstallPath(PackageInterface $package)
     {
         if (!$this->supports($package->getType())) {
@@ -87,6 +88,7 @@ private function initializeRoundcubemailEnvironment(): void
         require_once INSTALL_PATH . 'program/include/iniset.php';
     }
 
+    #[\Override]
     public function isInstalled(InstalledRepositoryInterface $repo, PackageInterface $package)
     {
         $this->setRoundcubemailInstallPath($repo);
@@ -94,6 +96,7 @@ public function isInstalled(InstalledRepositoryInterface $repo, PackageInterface
         return parent::isInstalled($repo, $package);
     }
 
+    #[\Override]
     public function install(InstalledRepositoryInterface $repo, PackageInterface $package)
     {
         $this->setRoundcubemailInstallPath($repo);
@@ -155,6 +158,7 @@ public function install(InstalledRepositoryInterface $repo, PackageInterface $pa
         return null;
     }
 
+    #[\Override]
     public function update(InstalledRepositoryInterface $repo, PackageInterface $initial, PackageInterface $target)
     {
         $this->setRoundcubemailInstallPath($repo);
@@ -220,6 +224,7 @@ public function update(InstalledRepositoryInterface $repo, PackageInterface $ini
         return null;
     }
 
+    #[\Override]
     public function uninstall(InstalledRepositoryInterface $repo, PackageInterface $package)
     {
         $this->setRoundcubemailInstallPath($repo);
@@ -261,6 +266,7 @@ public function uninstall(InstalledRepositoryInterface $repo, PackageInterface $
         return null;
     }
 
+    #[\Override]
     public function supports($packageType)
     {
         return $packageType === $this->composer_type;
diff --git a/src/PluginInstaller.php b/src/PluginInstaller.php
index e09fbe4..99356c0 100644
--- a/src/PluginInstaller.php
+++ b/src/PluginInstaller.php
@@ -6,11 +6,13 @@ class PluginInstaller extends ExtensionInstaller
 {
     protected $composer_type = 'roundcube-plugin';
 
+    #[\Override]
     public function getVendorDir()
     {
         return $this->getRoundcubemailInstallPath() . \DIRECTORY_SEPARATOR . 'plugins';
     }
 
+    #[\Override]
     protected function confirmInstall($package_name)
     {
         $config = $this->composer->getConfig()->get('roundcube');
@@ -24,6 +26,7 @@ protected function confirmInstall($package_name)
         return $answer;
     }
 
+    #[\Override]
     protected function getConfig($package_name, $config, $add)
     {
         $cur_config = !empty($config['plugins'])
diff --git a/src/RoundcubeInstaller.php b/src/RoundcubeInstaller.php
index a7f81fe..5f117c5 100644
--- a/src/RoundcubeInstaller.php
+++ b/src/RoundcubeInstaller.php
@@ -11,6 +11,7 @@ class RoundcubeInstaller implements PluginInterface
     private $extentions = [PluginInstaller::class, SkinInstaller::class];
     private $installers = [];
 
+    #[\Override]
     public function activate(Composer $composer, IOInterface $io)
     {
         foreach ($this->extentions as $extension) {
@@ -20,6 +21,7 @@ public function activate(Composer $composer, IOInterface $io)
         }
     }
 
+    #[\Override]
     public function deactivate(Composer $composer, IOInterface $io)
     {
         foreach ($this->installers as $installer) {
@@ -27,5 +29,6 @@ public function deactivate(Composer $composer, IOInterface $io)
         }
     }
 
+    #[\Override]
     public function uninstall(Composer $composer, IOInterface $io) {}
 }
diff --git a/src/SkinInstaller.php b/src/SkinInstaller.php
index 4d9cee5..1e8c29b 100644
--- a/src/SkinInstaller.php
+++ b/src/SkinInstaller.php
@@ -6,11 +6,13 @@ class SkinInstaller extends ExtensionInstaller
 {
     protected $composer_type = 'roundcube-skin';
 
+    #[\Override]
     public function getVendorDir()
     {
         return $this->getRoundcubemailInstallPath() . \DIRECTORY_SEPARATOR . 'skins';
     }
 
+    #[\Override]
     protected function confirmInstall($package_name)
     {
         $config = $this->composer->getConfig()->get('roundcube');
@@ -24,6 +26,7 @@ protected function confirmInstall($package_name)
         return $answer;
     }
 
+    #[\Override]
     protected function getConfig($package_name, $config, $add)
     {
         $cur_config = !empty($config['skin'])