diff --git a/DataCollector/LdapToolsDataCollector.php b/DataCollector/LdapToolsDataCollector.php
index 3e7c0ce..7e87375 100644
--- a/DataCollector/LdapToolsDataCollector.php
+++ b/DataCollector/LdapToolsDataCollector.php
@@ -57,7 +57,7 @@ public function getName()
     /**
      * {@inheritdoc}
      */
-    public function collect(Request $request, Response $response, \Exception $exception = null)
+    public function collect(Request $request, Response $response, \Throwable $exception = null)
     {
         if (!$this->ldap) {
             return;
diff --git a/DependencyInjection/Configuration.php b/DependencyInjection/Configuration.php
index fd95704..69408d7 100644
--- a/DependencyInjection/Configuration.php
+++ b/DependencyInjection/Configuration.php
@@ -39,8 +39,15 @@ public function __construct($debug)
      */
     public function getConfigTreeBuilder()
     {
-        $treeBuilder = new TreeBuilder();
-        $rootNode = $treeBuilder->root('ldap_tools');
+        $treeBuilder = new TreeBuilder('ldap_tools');
+
+        if (method_exists($treeBuilder, 'getRootNode')) {
+            $rootNode = $treeBuilder->getRootNode();
+        } else {
+            // BC layer for symfony/config 4.1 and older
+            $rootNode = $treeBuilder->root('ldap_tools');
+        }
+
         $this->addMainSection($rootNode);
         $this->addDoctrineSection($rootNode);
         $this->addGeneralSection($rootNode);
diff --git a/Doctrine/Subscriber/LdapObjectSubscriber.php b/Doctrine/Subscriber/LdapObjectSubscriber.php
index 6b38137..f8c9ee5 100644
--- a/Doctrine/Subscriber/LdapObjectSubscriber.php
+++ b/Doctrine/Subscriber/LdapObjectSubscriber.php
@@ -255,7 +255,7 @@ protected function queryLdapForObjects(\ReflectionProperty $property, LdapObject
      */
     protected function getObjectFromLifeCycleArgs(LifecycleEventArgs $args)
     {
-        $rc = new \ReflectionClass('Doctrine\Common\Persistence\Event\LifecycleEventArgs');
+        $rc = new \ReflectionClass('Doctrine\ORM\Event\LifecycleEventArgs');
 
         if ($rc->hasMethod('getObject')) {
             return $args->getObject();
@@ -272,7 +272,7 @@ protected function getObjectFromLifeCycleArgs(LifecycleEventArgs $args)
      */
     protected function getOmFromLifeCycleArgs(LifecycleEventArgs $args)
     {
-        $rc = new \ReflectionClass('Doctrine\Common\Persistence\Event\LifecycleEventArgs');
+        $rc = new \ReflectionClass('Doctrine\ORM\Event\LifecycleEventArgs');
 
         if ($rc->hasMethod('getObjectManager')) {
             return $args->getObjectManager();
diff --git a/Event/AuthenticationHandlerEvent.php b/Event/AuthenticationHandlerEvent.php
index 4fba81b..3716348 100644
--- a/Event/AuthenticationHandlerEvent.php
+++ b/Event/AuthenticationHandlerEvent.php
@@ -10,7 +10,7 @@
 
 namespace LdapTools\Bundle\LdapToolsBundle\Event;
 
-use Symfony\Component\EventDispatcher\Event;
+use Symfony\Component\EventDispatcher\EventDispatcher;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
@@ -21,7 +21,7 @@
  *
  * @author Chad Sikorra <Chad.Sikorra@gmail.com>
  */
-class AuthenticationHandlerEvent extends Event
+class AuthenticationHandlerEvent extends EventDispatcher
 {
     /**
      * The event name that happens after the default authentication success handler is called.
diff --git a/Event/LdapLoginEvent.php b/Event/LdapLoginEvent.php
index 831a8d6..c8d75b3 100644
--- a/Event/LdapLoginEvent.php
+++ b/Event/LdapLoginEvent.php
@@ -11,7 +11,7 @@
 namespace LdapTools\Bundle\LdapToolsBundle\Event;
 
 use LdapTools\Bundle\LdapToolsBundle\Security\User\LdapUser;
-use Symfony\Component\EventDispatcher\Event;
+use Symfony\Component\EventDispatcher\EventDispatcher;
 use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
 use Symfony\Component\Security\Core\User\UserInterface;
 
@@ -20,7 +20,7 @@
  *
  * @author Chad Sikorra <Chad.Sikorra@gmail.com>
  */
-class LdapLoginEvent extends Event
+class LdapLoginEvent extends EventDispatcher
 {
     /**
      * The event name when the login was successful
diff --git a/Event/LoadUserEvent.php b/Event/LoadUserEvent.php
index 9e49768..b024c97 100644
--- a/Event/LoadUserEvent.php
+++ b/Event/LoadUserEvent.php
@@ -12,7 +12,7 @@
 
 use LdapTools\Bundle\LdapToolsBundle\Security\User\LdapUser;
 use LdapTools\Object\LdapObject;
-use Symfony\Component\EventDispatcher\Event;
+use Symfony\Component\EventDispatcher\EventDispatcher;
 use Symfony\Component\Security\Core\User\UserInterface;
 
 /**
@@ -20,7 +20,7 @@
  *
  * @author Chad Sikorra <Chad.Sikorra@gmail.com>
  */
-class LoadUserEvent extends Event
+class LoadUserEvent extends EventDispatcher
 {
     /**
      * The event name that happens before a user is loaded from the user provider.
diff --git a/Resources/doc/LDAP-Authentication-Provider.md b/Resources/doc/LDAP-Authentication-Provider.md
index 8a6ad73..e8145ef 100644
--- a/Resources/doc/LDAP-Authentication-Provider.md
+++ b/Resources/doc/LDAP-Authentication-Provider.md
@@ -235,7 +235,7 @@ objects:
 # app/config/config.yml
 ldap_tools:
     general:
-        schema_folder: "%kernel.root_dir%/Resources/schema"
+        schema_folder: "%kernel.project_dir%/app/Resources/schema"
     security:
         ldap_object_type: 'SymfonyUser'
 ```
diff --git a/Security/Authentication/Provider/LdapAuthenticationProvider.php b/Security/Authentication/Provider/LdapAuthenticationProvider.php
index 6f962fc..44242e6 100644
--- a/Security/Authentication/Provider/LdapAuthenticationProvider.php
+++ b/Security/Authentication/Provider/LdapAuthenticationProvider.php
@@ -156,7 +156,7 @@ protected function doAuthentication(UserInterface $user, TokenInterface $token)
 
             throw new BadCredentialsException($response->getErrorMessage(), $response->getErrorCode());
         }
-        $this->dispatcher->dispatch(LdapLoginEvent::SUCCESS, new LdapLoginEvent($user, $token));
+        $this->dispatcher->dispatch(new LdapLoginEvent($user, $token), LdapLoginEvent::SUCCESS);
 
         $newToken = new UsernamePasswordToken($user, null, $this->providerKey, $user->getRoles());
         $newToken->setAttributes($token->getAttributes());
diff --git a/Security/LdapGuardAuthenticator.php b/Security/LdapGuardAuthenticator.php
index 782ab16..c5e3e94 100644
--- a/Security/LdapGuardAuthenticator.php
+++ b/Security/LdapGuardAuthenticator.php
@@ -211,8 +211,8 @@ public function checkCredentials($credentials, UserInterface $user)
             $token = new UsernamePasswordToken($user, $credentials['password'], 'ldap-tools', $user->getRoles());
             $token->setAttribute('ldap_domain', $credDomain);
             $this->dispatcher->dispatch(
-                LdapLoginEvent::SUCCESS,
-                new LdapLoginEvent($user, $token)
+                new LdapLoginEvent($user, $token),
+                LdapLoginEvent::SUCCESS
             );
         } catch (\Exception $e) {
             $this->hideOrThrow($e, $this->options['hide_user_not_found_exceptions']);
@@ -236,7 +236,7 @@ public function onAuthenticationSuccess(Request $request, TokenInterface $token,
             $token,
             $providerKey
         );
-        $this->dispatcher->dispatch(AuthenticationHandlerEvent::SUCCESS, $event);
+        $this->dispatcher->dispatch($event, AuthenticationHandlerEvent::SUCCESS);
 
         return $this->options['http_basic'] ? null : $event->getResponse();
     }
@@ -251,7 +251,7 @@ public function onAuthenticationFailure(Request $request, AuthenticationExceptio
             $request,
             $exception
         );
-        $this->dispatcher->dispatch(AuthenticationHandlerEvent::FAILURE, $event);
+        $this->dispatcher->dispatch($event, AuthenticationHandlerEvent::FAILURE);
 
         return $this->options['http_basic'] ? null : $event->getResponse();
     }
@@ -267,7 +267,7 @@ public function start(Request $request, AuthenticationException $authException =
             $request,
             $authException
         );
-        $this->dispatcher->dispatch(AuthenticationHandlerEvent::START, $event);
+        $this->dispatcher->dispatch($event, AuthenticationHandlerEvent::START);
 
         return $event->getResponse();
     }
diff --git a/Security/User/LdapUser.php b/Security/User/LdapUser.php
index ddc1737..b55ec48 100644
--- a/Security/User/LdapUser.php
+++ b/Security/User/LdapUser.php
@@ -11,14 +11,14 @@
 namespace LdapTools\Bundle\LdapToolsBundle\Security\User;
 
 use LdapTools\Object\LdapObject;
-use Symfony\Component\Security\Core\User\AdvancedUserInterface;
+use Symfony\Component\Security\Core\User\UserInterface;
 
 /**
  * Represents a user from LDAP.
  *
  * @author Chad Sikorra <Chad.Sikorra@gmail.com>
  */
-class LdapUser extends LdapObject implements LdapUserInterface, AdvancedUserInterface, \Serializable
+class LdapUser extends LdapObject implements LdapUserInterface, UserInterface, \Serializable
 {
     /**
      * @var array The Symfony roles for this user.
diff --git a/Security/User/LdapUserChecker.php b/Security/User/LdapUserChecker.php
index 98f0618..cce33fe 100644
--- a/Security/User/LdapUserChecker.php
+++ b/Security/User/LdapUserChecker.php
@@ -15,16 +15,60 @@
 use Symfony\Component\Security\Core\Exception\CredentialsExpiredException;
 use Symfony\Component\Security\Core\Exception\DisabledException;
 use Symfony\Component\Security\Core\Exception\LockedException;
-use Symfony\Component\Security\Core\User\UserChecker;
 use Symfony\Component\Security\Core\User\UserInterface;
+use Symfony\Component\Security\Core\User\UserCheckerInterface;
 
 /**
  * Interpret extended LDAP codes from authentication to determine the state of the LDAP account.
  *
  * @author Chad Sikorra <Chad.Sikorra@gmail.com>
  */
-class LdapUserChecker extends UserChecker
+class LdapUserChecker implements UserCheckerInterface
 {
+    /**
+     * {@inheritdoc}
+     */
+    public function checkPreAuth(UserInterface $user)
+    {
+        if (!$user instanceof LdapUser) {
+            return;
+        }
+
+        if (!$user->isAccountNonLocked()) {
+            $ex = new LockedException('User account is locked.');
+            $ex->setUser($user);
+            throw $ex;
+        }
+
+        if (!$user->isEnabled()) {
+            $ex = new DisabledException('User account is disabled.');
+            $ex->setUser($user);
+            throw $ex;
+        }
+
+        if (!$user->isAccountNonExpired()) {
+            $ex = new AccountExpiredException('User account has expired.');
+            $ex->setUser($user);
+            throw $ex;
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function checkPostAuth(UserInterface $user)
+    {
+        if (!$user instanceof LdapUser) {
+            return;
+        }
+
+        if (!$user->isCredentialsNonExpired()) {
+            $ex = new CredentialsExpiredException('User credentials have expired.');
+            $ex->setUser($user);
+            throw $ex;
+        }
+    }
+
     /**
      * Based on the LDAP error code and the LDAP type, throw any specific exceptions detected.
      *
diff --git a/Security/User/LdapUserProvider.php b/Security/User/LdapUserProvider.php
index 9505f1f..548963c 100644
--- a/Security/User/LdapUserProvider.php
+++ b/Security/User/LdapUserProvider.php
@@ -88,11 +88,11 @@ public function __construct(LdapManager $ldap, EventDispatcherInterface $dispatc
      */
     public function loadUserByUsername($username)
     {
-        $this->dispatcher->dispatch(LoadUserEvent::BEFORE, new LoadUserEvent($username, $this->ldap->getDomainContext()));
+        $this->dispatcher->dispatch(new LoadUserEvent($username, $this->ldap->getDomainContext()), LoadUserEvent::BEFORE);
         $ldapUser = $this->getLdapUser('username', $username);
         $user = $this->constructUserClass($ldapUser);
         $this->roleMapper->setRoles($user);
-        $this->dispatcher->dispatch(LoadUserEvent::AFTER, new LoadUserEvent($username, $this->ldap->getDomainContext(), $user, $ldapUser));
+        $this->dispatcher->dispatch(new LoadUserEvent($username, $this->ldap->getDomainContext(), $user, $ldapUser), LoadUserEvent::AFTER);
 
         return $user;
     }
diff --git a/composer.json b/composer.json
index 062857c..03d7ae2 100644
--- a/composer.json
+++ b/composer.json
@@ -19,15 +19,15 @@
     ],
     "require": {
         "ldaptools/ldaptools": ">=0.25",
-        "symfony/framework-bundle": "~2.7|~3.0|~4.0"
+        "symfony/framework-bundle": "~2.7|~3.0|~4.0|~5.0"
     },
     "require-dev": {
         "friendsofphp/php-cs-fixer": "~1.0",
         "phpspec/phpspec": "~3.0",
         "akeneo/phpspec-skip-example-extension": "~2.0",
         "doctrine/orm": "~2.4",
-        "symfony/form": "~2.7|~3.0|~4.0",
-        "symfony/security-bundle": "~2.7|~3.0|~4.0"
+        "symfony/form": "~2.7|~3.0|~4.0|~5.0",
+        "symfony/security-bundle": "~2.7|~3.0|~4.0|~5.0"
     },
     "suggest": {
         "doctrine/doctrine-bundle": "For LDAP object type integration in Doctrine."
diff --git a/spec/LdapTools/Bundle/LdapToolsBundle/Security/Authentication/Provider/LdapAuthenticationProviderSpec.php b/spec/LdapTools/Bundle/LdapToolsBundle/Security/Authentication/Provider/LdapAuthenticationProviderSpec.php
index 50aff5a..cb0bd1c 100644
--- a/spec/LdapTools/Bundle/LdapToolsBundle/Security/Authentication/Provider/LdapAuthenticationProviderSpec.php
+++ b/spec/LdapTools/Bundle/LdapToolsBundle/Security/Authentication/Provider/LdapAuthenticationProviderSpec.php
@@ -211,7 +211,7 @@ function it_should_switch_the_domain_if_the_token_has_the_ldap_domain_set($ldap,
     
     function it_should_call_a_login_success_event($token, $dispatcher)
     {
-        $dispatcher->dispatch('ldap_tools_bundle.login.success', Argument::type('LdapTools\Bundle\LdapToolsBundle\Event\LdapLoginEvent'))->shouldBeCalled();
+        $dispatcher->dispatch(Argument::type('LdapTools\Bundle\LdapToolsBundle\Event\LdapLoginEvent'), 'ldap_tools_bundle.login.success')->shouldBeCalled();
         $this->authenticate($token);
     }
 
diff --git a/spec/LdapTools/Bundle/LdapToolsBundle/Security/LdapGuardAuthenticatorSpec.php b/spec/LdapTools/Bundle/LdapToolsBundle/Security/LdapGuardAuthenticatorSpec.php
index 76cb3c3..cd9e29f 100644
--- a/spec/LdapTools/Bundle/LdapToolsBundle/Security/LdapGuardAuthenticatorSpec.php
+++ b/spec/LdapTools/Bundle/LdapToolsBundle/Security/LdapGuardAuthenticatorSpec.php
@@ -342,26 +342,26 @@ function it_should_call_a_login_success_event($connection, $dispatcher)
         $connection->execute(new AuthenticationOperation('foo', 'bar'))->shouldBeCalled()->willReturn(new AuthenticationResponse(true));
         $this->checkCredentials($credentials, $user)->shouldReturn(true);
 
-        $dispatcher->dispatch('ldap_tools_bundle.login.success', new LdapLoginEvent($user, $token))->shouldBeCalled();
+        $dispatcher->dispatch(new LdapLoginEvent($user, $token), 'ldap_tools_bundle.login.success')->shouldBeCalled();
     }
 
     function it_should_call_an_auth_success_handler_event(Request $request, $dispatcher, TokenInterface $token)
     {
-        $dispatcher->dispatch('ldap_tools_bundle.guard.login.success', Argument::type('LdapTools\Bundle\LdapToolsBundle\Event\AuthenticationHandlerEvent'))->shouldBeCalled();
+        $dispatcher->dispatch(Argument::type('LdapTools\Bundle\LdapToolsBundle\Event\AuthenticationHandlerEvent'), 'ldap_tools_bundle.guard.login.success')->shouldBeCalled();
 
         $this->onAuthenticationSuccess($request, $token, 'foo');
     }
 
     function it_should_call_an_auth_failure_handler_event(Request $request, $dispatcher)
     {
-        $dispatcher->dispatch('ldap_tools_bundle.guard.login.failure', Argument::type('LdapTools\Bundle\LdapToolsBundle\Event\AuthenticationHandlerEvent'))->shouldBeCalled();
+        $dispatcher->dispatch(Argument::type('LdapTools\Bundle\LdapToolsBundle\Event\AuthenticationHandlerEvent'), 'ldap_tools_bundle.guard.login.failure')->shouldBeCalled();
 
         $this->onAuthenticationFailure($request, new AuthenticationException('foo'));
     }
 
     function it_should_call_an_auth_start_event(Request $request, $dispatcher)
     {
-        $dispatcher->dispatch('ldap_tools_bundle.guard.login.start', Argument::type('LdapTools\Bundle\LdapToolsBundle\Event\AuthenticationHandlerEvent'))->shouldBeCalled();
+        $dispatcher->dispatch(Argument::type('LdapTools\Bundle\LdapToolsBundle\Event\AuthenticationHandlerEvent'), 'ldap_tools_bundle.guard.login.start')->shouldBeCalled();
 
         $this->start($request, new AuthenticationException('foo'));
     }
diff --git a/spec/LdapTools/Bundle/LdapToolsBundle/Security/User/LdapUserProviderSpec.php b/spec/LdapTools/Bundle/LdapToolsBundle/Security/User/LdapUserProviderSpec.php
index bbd22da..18783c7 100644
--- a/spec/LdapTools/Bundle/LdapToolsBundle/Security/User/LdapUserProviderSpec.php
+++ b/spec/LdapTools/Bundle/LdapToolsBundle/Security/User/LdapUserProviderSpec.php
@@ -72,8 +72,8 @@ function it_is_initializable()
 
     function it_should_load_by_username($dispatcher)
     {
-        $dispatcher->dispatch(LoadUserEvent::BEFORE, Argument::type('\LdapTools\Bundle\LdapToolsBundle\Event\LoadUserEvent'))->shouldBeCalledTimes(1);
-        $dispatcher->dispatch(LoadUserEvent::AFTER, Argument::type('\LdapTools\Bundle\LdapToolsBundle\Event\LoadUserEvent'))->shouldBeCalledTimes(1);
+        $dispatcher->dispatch(Argument::type('\LdapTools\Bundle\LdapToolsBundle\Event\LoadUserEvent'), LoadUserEvent::BEFORE)->shouldBeCalledTimes(1);
+        $dispatcher->dispatch(Argument::type('\LdapTools\Bundle\LdapToolsBundle\Event\LoadUserEvent'), LoadUserEvent::AFTER)->shouldBeCalledTimes(1);
 
         $this->loadUserByUsername('foo')->shouldBeAnInstanceOf('\LdapTools\Bundle\LdapToolsBundle\Security\User\LdapUser');
     }