diff --git a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
index 8d0a2dd604c77..4ab28b4f80dc6 100644
--- a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
+++ b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
@@ -214,7 +214,7 @@ private function addFormSection(ArrayNodeDefinition $rootNode, callable $enableI
                             ->validate()
                                 ->ifTrue()
                                 ->then(function ($v) {
-                                    @trigger_error('Since symfony/framework-bundle 5.2: Setting the "framework.form.legacy_error_messages" option to "true" is deprecated. It will have no effect as of Symfony 6.0.', \E_USER_DEPRECATED);
+                                    trigger_deprecation('symfony/framework-bundle', '5.2', 'Setting the "framework.form.legacy_error_messages" option to "true" is deprecated. It will have no effect as of Symfony 6.0.');
 
                                     return $v;
                                 })
diff --git a/src/Symfony/Component/Mailer/Bridge/Mailgun/Transport/MailgunApiTransport.php b/src/Symfony/Component/Mailer/Bridge/Mailgun/Transport/MailgunApiTransport.php
index 33d0fb1ff52c4..692e209ef170c 100644
--- a/src/Symfony/Component/Mailer/Bridge/Mailgun/Transport/MailgunApiTransport.php
+++ b/src/Symfony/Component/Mailer/Bridge/Mailgun/Transport/MailgunApiTransport.php
@@ -137,7 +137,7 @@ private function getPayload(Email $email, Envelope $envelope): array
             } else {
                 // fallback to prefix with "h:" to not break BC
                 $headerName = 'h:'.$name;
-                @trigger_error(sprintf('Not prefixing the Mailgun header name with "h:" is deprecated since Symfony  5.1. Use header name "%s" instead.', $headerName), \E_USER_DEPRECATED);
+                trigger_deprecation('symfony/mailer', '5.1', 'Not prefixing the Mailgun header name with "h:" is deprecated. Use header name "%s" instead.', $headerName);
             }
 
             $payload[$headerName] = $header->getBodyAsString();
diff --git a/src/Symfony/Component/Mailer/Bridge/Mailgun/composer.json b/src/Symfony/Component/Mailer/Bridge/Mailgun/composer.json
index 728f11761c3da..2e2534fff0251 100644
--- a/src/Symfony/Component/Mailer/Bridge/Mailgun/composer.json
+++ b/src/Symfony/Component/Mailer/Bridge/Mailgun/composer.json
@@ -17,6 +17,7 @@
     ],
     "require": {
         "php": ">=7.2.5",
+        "symfony/deprecation-contracts": "^2.1",
         "symfony/mailer": "^5.2.6"
     },
     "require-dev": {