diff --git a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
index 6d6195bbc9..497fb08424 100644
--- a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
+++ b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
@@ -542,7 +542,7 @@ class Configuration implements ConfigurationInterface
                         ->scalarNode('cookie_domain')->end()
                         ->enumNode('cookie_secure')->values([true, false, 'auto'])->end()
                         ->booleanNode('cookie_httponly')->defaultTrue()->end()
-                        ->enumNode('cookie_samesite')->values([null, Cookie::SAMESITE_LAX, Cookie::SAMESITE_STRICT])->defaultNull()->end()
+                        ->enumNode('cookie_samesite')->values([null, Cookie::SAMESITE_LAX, Cookie::SAMESITE_STRICT, Cookie::SAMESITE_NONE])->defaultNull()->end()
                         ->booleanNode('use_cookies')->end()
                         ->scalarNode('gc_divisor')->end()
                         ->scalarNode('gc_probability')->defaultValue(1)->end()
diff --git a/src/Symfony/Bundle/SecurityBundle/DependencyInjection/Security/Factory/RememberMeFactory.php b/src/Symfony/Bundle/SecurityBundle/DependencyInjection/Security/Factory/RememberMeFactory.php
index f7500f05e3..28103a3522 100644
--- a/src/Symfony/Bundle/SecurityBundle/DependencyInjection/Security/Factory/RememberMeFactory.php
+++ b/src/Symfony/Bundle/SecurityBundle/DependencyInjection/Security/Factory/RememberMeFactory.php
@@ -144,7 +144,7 @@ class RememberMeFactory implements SecurityFactoryInterface
             if ('secure' === $name) {
                 $builder->enumNode($name)->values([true, false, 'auto'])->defaultValue('auto' === $value ? null : $value);
             } elseif ('samesite' === $name) {
-                $builder->enumNode($name)->values([null, Cookie::SAMESITE_LAX, Cookie::SAMESITE_STRICT])->defaultValue($value);
+                $builder->enumNode($name)->values([null, Cookie::SAMESITE_LAX, Cookie::SAMESITE_STRICT, Cookie::SAMESITE_NONE])->defaultValue($value);
             } elseif (\is_bool($value)) {
                 $builder->booleanNode($name)->defaultValue($value);
             } else {