diff --git a/src/Symfony/Component/Ldap/CHANGELOG.md b/src/Symfony/Component/Ldap/CHANGELOG.md
index 7e3553886cf43..488f3d3c80939 100644
--- a/src/Symfony/Component/Ldap/CHANGELOG.md
+++ b/src/Symfony/Component/Ldap/CHANGELOG.md
@@ -1,6 +1,12 @@
 CHANGELOG
 =========
 
+6.0
+---
+
+ * Removed `LdapUser::getUsername()` method, use `getUserIdentifier()` instead
+ * Removed `LdapUserProvider::loadUserByUsername()` method, use `loadUserByIdentifier()` instead
+
 5.3
 ---
 
diff --git a/src/Symfony/Component/Ldap/Security/CheckLdapCredentialsListener.php b/src/Symfony/Component/Ldap/Security/CheckLdapCredentialsListener.php
index e32793c3d3bf4..649e4a20a197d 100644
--- a/src/Symfony/Component/Ldap/Security/CheckLdapCredentialsListener.php
+++ b/src/Symfony/Component/Ldap/Security/CheckLdapCredentialsListener.php
@@ -17,7 +17,6 @@
 use Symfony\Component\Ldap\LdapInterface;
 use Symfony\Component\Security\Core\Exception\BadCredentialsException;
 use Symfony\Component\Security\Core\Exception\LogicException;
-use Symfony\Component\Security\Core\User\PasswordAuthenticatedUserInterface;
 use Symfony\Component\Security\Http\Authenticator\Passport\Credentials\PasswordCredentials;
 use Symfony\Component\Security\Http\Authenticator\Passport\UserPassportInterface;
 use Symfony\Component\Security\Http\Event\CheckPassportEvent;
@@ -70,9 +69,6 @@ public function onCheckPassport(CheckPassportEvent $event)
         }
 
         $user = $passport->getUser();
-        if (!$user instanceof PasswordAuthenticatedUserInterface) {
-            trigger_deprecation('symfony/ldap', '5.3', 'Not implementing the "%s" interface in class "%s" while using password-based authenticators is deprecated.', PasswordAuthenticatedUserInterface::class, get_debug_type($user));
-        }
 
         /** @var LdapInterface $ldap */
         $ldap = $this->ldapLocator->get($ldapBadge->getLdapServiceId());
@@ -83,8 +79,7 @@ public function onCheckPassport(CheckPassportEvent $event)
                 } else {
                     throw new LogicException('Using the "query_string" config without using a "search_dn" and a "search_password" is not supported.');
                 }
-                // @deprecated since 5.3, change to $user->getUserIdentifier() in 6.0
-                $username = $ldap->escape(method_exists($user, 'getUserIdentifier') ? $user->getUserIdentifier() : $user->getUsername(), '', LdapInterface::ESCAPE_FILTER);
+                $username = $ldap->escape($user->getUserIdentifier(), '', LdapInterface::ESCAPE_FILTER);
                 $query = str_replace('{username}', $username, $ldapBadge->getQueryString());
                 $result = $ldap->query($ldapBadge->getDnString(), $query)->execute();
                 if (1 !== $result->count()) {
@@ -93,8 +88,7 @@ public function onCheckPassport(CheckPassportEvent $event)
 
                 $dn = $result[0]->getDn();
             } else {
-                // @deprecated since 5.3, change to $user->getUserIdentifier() in 6.0
-                $username = $ldap->escape(method_exists($user, 'getUserIdentifier') ? $user->getUserIdentifier() : $user->getUsername(), '', LdapInterface::ESCAPE_DN);
+                $username = $ldap->escape($user->getUserIdentifier(), '', LdapInterface::ESCAPE_DN);
                 $dn = str_replace('{username}', $username, $ldapBadge->getDnString());
             }
 
diff --git a/src/Symfony/Component/Ldap/Security/LdapUser.php b/src/Symfony/Component/Ldap/Security/LdapUser.php
index 5188cbad4c0ca..89bff974f7af0 100644
--- a/src/Symfony/Component/Ldap/Security/LdapUser.php
+++ b/src/Symfony/Component/Ldap/Security/LdapUser.php
@@ -71,16 +71,6 @@ public function getSalt(): ?string
         return null;
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function getUsername(): string
-    {
-        trigger_deprecation('symfony/ldap', '5.3', 'Method "%s()" is deprecated and will be removed in 6.0, use getUserIdentifier() instead.', __METHOD__);
-
-        return $this->username;
-    }
-
     public function getUserIdentifier(): string
     {
         return $this->username;
diff --git a/src/Symfony/Component/Ldap/Security/LdapUserProvider.php b/src/Symfony/Component/Ldap/Security/LdapUserProvider.php
index 319d6c605c43c..3b6dd089f567d 100644
--- a/src/Symfony/Component/Ldap/Security/LdapUserProvider.php
+++ b/src/Symfony/Component/Ldap/Security/LdapUserProvider.php
@@ -62,16 +62,6 @@ public function __construct(LdapInterface $ldap, string $baseDn, string $searchD
         $this->extraFields = $extraFields;
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function loadUserByUsername(string $username)
-    {
-        trigger_deprecation('symfony/ldap', '5.3', 'Method "%s()" is deprecated, use loadUserByIdentifier() instead.', __METHOD__);
-
-        return $this->loadUserByIdentifier($username);
-    }
-
     public function loadUserByIdentifier(string $identifier): UserInterface
     {
         try {