diff --git a/ABELkeycloakBearerOnlyAdapterBundle.php b/ABELkeycloakBearerOnlyAdapterBundle.php
index 05339a6..f0f8bc4 100644
--- a/ABELkeycloakBearerOnlyAdapterBundle.php
+++ b/ABELkeycloakBearerOnlyAdapterBundle.php
@@ -5,6 +5,7 @@ namespace ABEL\Bundle\keycloakBearerOnlyAdapterBundle;
 
 
 use ABEL\Bundle\keycloakBearerOnlyAdapterBundle\DependencyInjection\ABELkeycloakBearerOnlyAdapterExtension;
+use Symfony\Component\DependencyInjection\Extension\ExtensionInterface;
 use Symfony\Component\HttpKernel\Bundle\Bundle;
 
 class ABELkeycloakBearerOnlyAdapterBundle extends Bundle
@@ -12,7 +13,7 @@ class ABELkeycloakBearerOnlyAdapterBundle extends Bundle
     /**
      * @return ExtensionInterface|null
      */
-    public function getContainerExtension()
+    public function getContainerExtension(): ?ExtensionInterface
     {
         if (null === $this->extension) {
             $this->extension = new ABELkeycloakBearerOnlyAdapterExtension();
diff --git a/DependencyInjection/ABELkeycloakBearerOnlyAdapterExtension.php b/DependencyInjection/ABELkeycloakBearerOnlyAdapterExtension.php
index a568b33..fa685c6 100644
--- a/DependencyInjection/ABELkeycloakBearerOnlyAdapterExtension.php
+++ b/DependencyInjection/ABELkeycloakBearerOnlyAdapterExtension.php
@@ -27,7 +27,7 @@ class ABELkeycloakBearerOnlyAdapterExtension extends Extension
         $definition->replaceArgument(4, $config['ssl_verification']);
     }
 
-    public function getAlias()
+    public function getAlias(): string
     {
         return 'abel_keycloak_bearer_only_adapter';
     }
diff --git a/Security/User/KeycloakBearerUser.php b/Security/User/KeycloakBearerUser.php
index 84eca85..7edd42c 100644
--- a/Security/User/KeycloakBearerUser.php
+++ b/Security/User/KeycloakBearerUser.php
@@ -202,7 +202,7 @@ class KeycloakBearerUser implements UserInterface, \Serializable
      *
      * @return array (Role|string)[] The user roles
      */
-    public function getRoles()
+    public function getRoles(): array
     {
         return $this->roles;
     }