diff --git a/src/Symfony/Component/Mailer/Bridge/Amazon/Http/Api/SesTransport.php b/src/Symfony/Component/Mailer/Bridge/Amazon/Http/Api/SesTransport.php
index 0bd4b5aa1db4..9bb9850a8d10 100644
--- a/src/Symfony/Component/Mailer/Bridge/Amazon/Http/Api/SesTransport.php
+++ b/src/Symfony/Component/Mailer/Bridge/Amazon/Http/Api/SesTransport.php
@@ -12,11 +12,11 @@
 namespace Symfony\Component\Mailer\Bridge\Amazon\Http\Api;
 
 use Psr\Log\LoggerInterface;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\Mailer\Exception\TransportException;
 use Symfony\Component\Mailer\SmtpEnvelope;
 use Symfony\Component\Mailer\Transport\Http\Api\AbstractApiTransport;
 use Symfony\Component\Mime\Email;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 use Symfony\Contracts\HttpClient\HttpClientInterface;
 
 /**
diff --git a/src/Symfony/Component/Mailer/Bridge/Amazon/Http/SesTransport.php b/src/Symfony/Component/Mailer/Bridge/Amazon/Http/SesTransport.php
index fd3787a5c231..6e90be383ec0 100644
--- a/src/Symfony/Component/Mailer/Bridge/Amazon/Http/SesTransport.php
+++ b/src/Symfony/Component/Mailer/Bridge/Amazon/Http/SesTransport.php
@@ -12,10 +12,10 @@
 namespace Symfony\Component\Mailer\Bridge\Amazon\Http;
 
 use Psr\Log\LoggerInterface;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\Mailer\Exception\TransportException;
 use Symfony\Component\Mailer\SentMessage;
 use Symfony\Component\Mailer\Transport\Http\AbstractHttpTransport;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 use Symfony\Contracts\HttpClient\HttpClientInterface;
 
 /**
diff --git a/src/Symfony/Component/Mailer/Bridge/Amazon/Smtp/SesTransport.php b/src/Symfony/Component/Mailer/Bridge/Amazon/Smtp/SesTransport.php
index dc72f959c4d3..b2773100c4b6 100644
--- a/src/Symfony/Component/Mailer/Bridge/Amazon/Smtp/SesTransport.php
+++ b/src/Symfony/Component/Mailer/Bridge/Amazon/Smtp/SesTransport.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Mailer\Bridge\Amazon\Smtp;
 
 use Psr\Log\LoggerInterface;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\Mailer\Transport\Smtp\EsmtpTransport;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 
 /**
  * @author Kevin Verschaeve
diff --git a/src/Symfony/Component/Mailer/Bridge/Amazon/composer.json b/src/Symfony/Component/Mailer/Bridge/Amazon/composer.json
index 6dec33a8fd0b..b0fd9da26a60 100644
--- a/src/Symfony/Component/Mailer/Bridge/Amazon/composer.json
+++ b/src/Symfony/Component/Mailer/Bridge/Amazon/composer.json
@@ -17,7 +17,7 @@
     ],
     "require": {
         "php": "^7.1.3",
-        "symfony/mailer": "^4.3|^5.0"
+        "symfony/mailer": "^4.4|^5.0"
     },
     "require-dev": {
         "symfony/http-client": "^4.3|^5.0"
diff --git a/src/Symfony/Component/Mailer/Bridge/Google/Smtp/GmailTransport.php b/src/Symfony/Component/Mailer/Bridge/Google/Smtp/GmailTransport.php
index fb7f58264748..0c651c86c626 100644
--- a/src/Symfony/Component/Mailer/Bridge/Google/Smtp/GmailTransport.php
+++ b/src/Symfony/Component/Mailer/Bridge/Google/Smtp/GmailTransport.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Mailer\Bridge\Google\Smtp;
 
 use Psr\Log\LoggerInterface;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\Mailer\Transport\Smtp\EsmtpTransport;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 
 /**
  * @author Kevin Verschaeve
diff --git a/src/Symfony/Component/Mailer/Bridge/Google/composer.json b/src/Symfony/Component/Mailer/Bridge/Google/composer.json
index 693c2df29b3d..ea7fd9a7ab42 100644
--- a/src/Symfony/Component/Mailer/Bridge/Google/composer.json
+++ b/src/Symfony/Component/Mailer/Bridge/Google/composer.json
@@ -17,7 +17,7 @@
     ],
     "require": {
         "php": "^7.1.3",
-        "symfony/mailer": "^4.3|^5.0"
+        "symfony/mailer": "^4.4|^5.0"
     },
     "require-dev": {
         "symfony/http-client": "^4.3|^5.0"
diff --git a/src/Symfony/Component/Mailer/Bridge/Mailchimp/Http/Api/MandrillTransport.php b/src/Symfony/Component/Mailer/Bridge/Mailchimp/Http/Api/MandrillTransport.php
index a177e664b62a..851f64a2fc49 100644
--- a/src/Symfony/Component/Mailer/Bridge/Mailchimp/Http/Api/MandrillTransport.php
+++ b/src/Symfony/Component/Mailer/Bridge/Mailchimp/Http/Api/MandrillTransport.php
@@ -12,11 +12,11 @@
 namespace Symfony\Component\Mailer\Bridge\Mailchimp\Http\Api;
 
 use Psr\Log\LoggerInterface;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\Mailer\Exception\TransportException;
 use Symfony\Component\Mailer\SmtpEnvelope;
 use Symfony\Component\Mailer\Transport\Http\Api\AbstractApiTransport;
 use Symfony\Component\Mime\Email;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 use Symfony\Contracts\HttpClient\HttpClientInterface;
 
 /**
diff --git a/src/Symfony/Component/Mailer/Bridge/Mailchimp/Http/MandrillTransport.php b/src/Symfony/Component/Mailer/Bridge/Mailchimp/Http/MandrillTransport.php
index ea8bcf4dbbba..54a88b3720ad 100644
--- a/src/Symfony/Component/Mailer/Bridge/Mailchimp/Http/MandrillTransport.php
+++ b/src/Symfony/Component/Mailer/Bridge/Mailchimp/Http/MandrillTransport.php
@@ -12,10 +12,10 @@
 namespace Symfony\Component\Mailer\Bridge\Mailchimp\Http;
 
 use Psr\Log\LoggerInterface;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\Mailer\Exception\TransportException;
 use Symfony\Component\Mailer\SentMessage;
 use Symfony\Component\Mailer\Transport\Http\AbstractHttpTransport;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 use Symfony\Contracts\HttpClient\HttpClientInterface;
 
 /**
diff --git a/src/Symfony/Component/Mailer/Bridge/Mailchimp/Smtp/MandrillTransport.php b/src/Symfony/Component/Mailer/Bridge/Mailchimp/Smtp/MandrillTransport.php
index 75c665f3cc12..e93492e370b1 100644
--- a/src/Symfony/Component/Mailer/Bridge/Mailchimp/Smtp/MandrillTransport.php
+++ b/src/Symfony/Component/Mailer/Bridge/Mailchimp/Smtp/MandrillTransport.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Mailer\Bridge\Mailchimp\Smtp;
 
 use Psr\Log\LoggerInterface;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\Mailer\Transport\Smtp\EsmtpTransport;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 
 /**
  * @author Kevin Verschaeve
diff --git a/src/Symfony/Component/Mailer/Bridge/Mailchimp/composer.json b/src/Symfony/Component/Mailer/Bridge/Mailchimp/composer.json
index a48abaea31bd..569d39f2ec85 100644
--- a/src/Symfony/Component/Mailer/Bridge/Mailchimp/composer.json
+++ b/src/Symfony/Component/Mailer/Bridge/Mailchimp/composer.json
@@ -17,7 +17,7 @@
     ],
     "require": {
         "php": "^7.1.3",
-        "symfony/mailer": "^4.3|^5.0"
+        "symfony/mailer": "^4.4|^5.0"
     },
     "require-dev": {
         "symfony/http-client": "^4.3|^5.0"
diff --git a/src/Symfony/Component/Mailer/Bridge/Mailgun/Http/Api/MailgunTransport.php b/src/Symfony/Component/Mailer/Bridge/Mailgun/Http/Api/MailgunTransport.php
index dc047c2e8729..766a643edd7b 100644
--- a/src/Symfony/Component/Mailer/Bridge/Mailgun/Http/Api/MailgunTransport.php
+++ b/src/Symfony/Component/Mailer/Bridge/Mailgun/Http/Api/MailgunTransport.php
@@ -12,12 +12,12 @@
 namespace Symfony\Component\Mailer\Bridge\Mailgun\Http\Api;
 
 use Psr\Log\LoggerInterface;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\Mailer\Exception\TransportException;
 use Symfony\Component\Mailer\SmtpEnvelope;
 use Symfony\Component\Mailer\Transport\Http\Api\AbstractApiTransport;
 use Symfony\Component\Mime\Email;
 use Symfony\Component\Mime\Part\Multipart\FormDataPart;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 use Symfony\Contracts\HttpClient\HttpClientInterface;
 
 /**
diff --git a/src/Symfony/Component/Mailer/Bridge/Mailgun/Http/MailgunTransport.php b/src/Symfony/Component/Mailer/Bridge/Mailgun/Http/MailgunTransport.php
index 2d3fe15a08eb..727ca9ddee21 100644
--- a/src/Symfony/Component/Mailer/Bridge/Mailgun/Http/MailgunTransport.php
+++ b/src/Symfony/Component/Mailer/Bridge/Mailgun/Http/MailgunTransport.php
@@ -12,12 +12,12 @@
 namespace Symfony\Component\Mailer\Bridge\Mailgun\Http;
 
 use Psr\Log\LoggerInterface;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\Mailer\Exception\TransportException;
 use Symfony\Component\Mailer\SentMessage;
 use Symfony\Component\Mailer\Transport\Http\AbstractHttpTransport;
 use Symfony\Component\Mime\Part\DataPart;
 use Symfony\Component\Mime\Part\Multipart\FormDataPart;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 use Symfony\Contracts\HttpClient\HttpClientInterface;
 
 /**
diff --git a/src/Symfony/Component/Mailer/Bridge/Mailgun/Smtp/MailgunTransport.php b/src/Symfony/Component/Mailer/Bridge/Mailgun/Smtp/MailgunTransport.php
index 105ab46ecd98..5173b0cd52eb 100644
--- a/src/Symfony/Component/Mailer/Bridge/Mailgun/Smtp/MailgunTransport.php
+++ b/src/Symfony/Component/Mailer/Bridge/Mailgun/Smtp/MailgunTransport.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Mailer\Bridge\Mailgun\Smtp;
 
 use Psr\Log\LoggerInterface;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\Mailer\Transport\Smtp\EsmtpTransport;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 
 /**
  * @author Kevin Verschaeve
diff --git a/src/Symfony/Component/Mailer/Bridge/Mailgun/composer.json b/src/Symfony/Component/Mailer/Bridge/Mailgun/composer.json
index c541eaf16116..af7fa9b83691 100644
--- a/src/Symfony/Component/Mailer/Bridge/Mailgun/composer.json
+++ b/src/Symfony/Component/Mailer/Bridge/Mailgun/composer.json
@@ -17,7 +17,7 @@
     ],
     "require": {
         "php": "^7.1.3",
-        "symfony/mailer": "^4.3|^5.0"
+        "symfony/mailer": "^4.4|^5.0"
     },
     "require-dev": {
         "symfony/http-client": "^4.3|^5.0"
diff --git a/src/Symfony/Component/Mailer/Bridge/Postmark/Http/Api/PostmarkTransport.php b/src/Symfony/Component/Mailer/Bridge/Postmark/Http/Api/PostmarkTransport.php
index 3ec9c640a655..9c1af02c8439 100644
--- a/src/Symfony/Component/Mailer/Bridge/Postmark/Http/Api/PostmarkTransport.php
+++ b/src/Symfony/Component/Mailer/Bridge/Postmark/Http/Api/PostmarkTransport.php
@@ -12,11 +12,11 @@
 namespace Symfony\Component\Mailer\Bridge\Postmark\Http\Api;
 
 use Psr\Log\LoggerInterface;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\Mailer\Exception\TransportException;
 use Symfony\Component\Mailer\SmtpEnvelope;
 use Symfony\Component\Mailer\Transport\Http\Api\AbstractApiTransport;
 use Symfony\Component\Mime\Email;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 use Symfony\Contracts\HttpClient\HttpClientInterface;
 
 /**
diff --git a/src/Symfony/Component/Mailer/Bridge/Postmark/Smtp/PostmarkTransport.php b/src/Symfony/Component/Mailer/Bridge/Postmark/Smtp/PostmarkTransport.php
index 4407a1bf1b0a..9e0fbe3479ba 100644
--- a/src/Symfony/Component/Mailer/Bridge/Postmark/Smtp/PostmarkTransport.php
+++ b/src/Symfony/Component/Mailer/Bridge/Postmark/Smtp/PostmarkTransport.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Mailer\Bridge\Postmark\Smtp;
 
 use Psr\Log\LoggerInterface;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\Mailer\Transport\Smtp\EsmtpTransport;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 
 /**
  * @author Kevin Verschaeve
diff --git a/src/Symfony/Component/Mailer/Bridge/Postmark/composer.json b/src/Symfony/Component/Mailer/Bridge/Postmark/composer.json
index 50e7e056b3ff..572c27bf57b0 100644
--- a/src/Symfony/Component/Mailer/Bridge/Postmark/composer.json
+++ b/src/Symfony/Component/Mailer/Bridge/Postmark/composer.json
@@ -17,7 +17,7 @@
     ],
     "require": {
         "php": "^7.1.3",
-        "symfony/mailer": "^4.3|^5.0"
+        "symfony/mailer": "^4.4|^5.0"
     },
     "require-dev": {
         "symfony/http-client": "^4.3|^5.0"
diff --git a/src/Symfony/Component/Mailer/Bridge/Sendgrid/Http/Api/SendgridTransport.php b/src/Symfony/Component/Mailer/Bridge/Sendgrid/Http/Api/SendgridTransport.php
index e45db91181f3..ff2a28bb89c0 100644
--- a/src/Symfony/Component/Mailer/Bridge/Sendgrid/Http/Api/SendgridTransport.php
+++ b/src/Symfony/Component/Mailer/Bridge/Sendgrid/Http/Api/SendgridTransport.php
@@ -12,12 +12,12 @@
 namespace Symfony\Component\Mailer\Bridge\Sendgrid\Http\Api;
 
 use Psr\Log\LoggerInterface;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\Mailer\Exception\TransportException;
 use Symfony\Component\Mailer\SmtpEnvelope;
 use Symfony\Component\Mailer\Transport\Http\Api\AbstractApiTransport;
 use Symfony\Component\Mime\Address;
 use Symfony\Component\Mime\Email;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 use Symfony\Contracts\HttpClient\HttpClientInterface;
 
 /**
diff --git a/src/Symfony/Component/Mailer/Bridge/Sendgrid/Smtp/SendgridTransport.php b/src/Symfony/Component/Mailer/Bridge/Sendgrid/Smtp/SendgridTransport.php
index 60ef601a16a6..6b9c74ca8024 100644
--- a/src/Symfony/Component/Mailer/Bridge/Sendgrid/Smtp/SendgridTransport.php
+++ b/src/Symfony/Component/Mailer/Bridge/Sendgrid/Smtp/SendgridTransport.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Mailer\Bridge\Sendgrid\Smtp;
 
 use Psr\Log\LoggerInterface;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\Mailer\Transport\Smtp\EsmtpTransport;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 
 /**
  * @author Kevin Verschaeve
diff --git a/src/Symfony/Component/Mailer/Bridge/Sendgrid/composer.json b/src/Symfony/Component/Mailer/Bridge/Sendgrid/composer.json
index 540593be6fe8..bd7fae77dda0 100644
--- a/src/Symfony/Component/Mailer/Bridge/Sendgrid/composer.json
+++ b/src/Symfony/Component/Mailer/Bridge/Sendgrid/composer.json
@@ -17,7 +17,7 @@
     ],
     "require": {
         "php": "^7.1.3",
-        "symfony/mailer": "^4.3|^5.0"
+        "symfony/mailer": "^4.4|^5.0"
     },
     "require-dev": {
         "symfony/http-client": "^4.3|^5.0"
diff --git a/src/Symfony/Component/Mailer/CHANGELOG.md b/src/Symfony/Component/Mailer/CHANGELOG.md
index 086e3305a7eb..5b2c5c528fca 100644
--- a/src/Symfony/Component/Mailer/CHANGELOG.md
+++ b/src/Symfony/Component/Mailer/CHANGELOG.md
@@ -1,6 +1,12 @@
 CHANGELOG
 =========
 
+4.4.0
+-----
+
+ * [BC BREAK] Transports depend on `Symfony\Contracts\EventDispatcher\EventDispatcherInterface`
+   instead of `Symfony\Component\EventDispatcher\EventDispatcherInterface`.
+
 4.3.0
 -----
 
diff --git a/src/Symfony/Component/Mailer/Tests/TransportTest.php b/src/Symfony/Component/Mailer/Tests/TransportTest.php
index 0d1f14326256..84b59d994748 100644
--- a/src/Symfony/Component/Mailer/Tests/TransportTest.php
+++ b/src/Symfony/Component/Mailer/Tests/TransportTest.php
@@ -13,7 +13,6 @@
 
 use PHPUnit\Framework\TestCase;
 use Psr\Log\LoggerInterface;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\Mailer\Bridge\Amazon;
 use Symfony\Component\Mailer\Bridge\Google;
 use Symfony\Component\Mailer\Bridge\Mailchimp;
@@ -23,6 +22,7 @@
 use Symfony\Component\Mailer\Exception\InvalidArgumentException;
 use Symfony\Component\Mailer\Exception\LogicException;
 use Symfony\Component\Mailer\Transport;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 use Symfony\Contracts\HttpClient\HttpClientInterface;
 
 class TransportTest extends TestCase
diff --git a/src/Symfony/Component/Mailer/Transport.php b/src/Symfony/Component/Mailer/Transport.php
index eeb1892fe8b3..0d2056e77e1f 100644
--- a/src/Symfony/Component/Mailer/Transport.php
+++ b/src/Symfony/Component/Mailer/Transport.php
@@ -12,7 +12,6 @@
 namespace Symfony\Component\Mailer;
 
 use Psr\Log\LoggerInterface;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\Mailer\Bridge\Amazon;
 use Symfony\Component\Mailer\Bridge\Google;
 use Symfony\Component\Mailer\Bridge\Mailchimp;
@@ -22,6 +21,7 @@
 use Symfony\Component\Mailer\Exception\InvalidArgumentException;
 use Symfony\Component\Mailer\Exception\LogicException;
 use Symfony\Component\Mailer\Transport\TransportInterface;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 use Symfony\Contracts\HttpClient\HttpClientInterface;
 
 /**
diff --git a/src/Symfony/Component/Mailer/Transport/AbstractTransport.php b/src/Symfony/Component/Mailer/Transport/AbstractTransport.php
index 748743fa8a30..80ab1f729636 100644
--- a/src/Symfony/Component/Mailer/Transport/AbstractTransport.php
+++ b/src/Symfony/Component/Mailer/Transport/AbstractTransport.php
@@ -14,7 +14,6 @@
 use Psr\Log\LoggerInterface;
 use Psr\Log\NullLogger;
 use Symfony\Component\EventDispatcher\EventDispatcher;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\Mailer\DelayedSmtpEnvelope;
 use Symfony\Component\Mailer\Event\MessageEvent;
 use Symfony\Component\Mailer\Exception\TransportException;
@@ -22,6 +21,7 @@
 use Symfony\Component\Mailer\SmtpEnvelope;
 use Symfony\Component\Mime\Address;
 use Symfony\Component\Mime\RawMessage;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 
 /**
  * @author Fabien Potencier <fabien@symfony.com>
diff --git a/src/Symfony/Component/Mailer/Transport/Http/AbstractHttpTransport.php b/src/Symfony/Component/Mailer/Transport/Http/AbstractHttpTransport.php
index f431c2fe8530..c350a581389c 100644
--- a/src/Symfony/Component/Mailer/Transport/Http/AbstractHttpTransport.php
+++ b/src/Symfony/Component/Mailer/Transport/Http/AbstractHttpTransport.php
@@ -12,9 +12,9 @@
 namespace Symfony\Component\Mailer\Transport\Http;
 
 use Psr\Log\LoggerInterface;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\HttpClient\HttpClient;
 use Symfony\Component\Mailer\Transport\AbstractTransport;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 use Symfony\Contracts\HttpClient\HttpClientInterface;
 
 /**
diff --git a/src/Symfony/Component/Mailer/Transport/Http/Api/AbstractApiTransport.php b/src/Symfony/Component/Mailer/Transport/Http/Api/AbstractApiTransport.php
index 89c25ca37661..6aa6f53bd60a 100644
--- a/src/Symfony/Component/Mailer/Transport/Http/Api/AbstractApiTransport.php
+++ b/src/Symfony/Component/Mailer/Transport/Http/Api/AbstractApiTransport.php
@@ -12,7 +12,6 @@
 namespace Symfony\Component\Mailer\Transport\Http\Api;
 
 use Psr\Log\LoggerInterface;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\HttpClient\HttpClient;
 use Symfony\Component\Mailer\Exception\RuntimeException;
 use Symfony\Component\Mailer\SentMessage;
@@ -21,6 +20,7 @@
 use Symfony\Component\Mime\Address;
 use Symfony\Component\Mime\Email;
 use Symfony\Component\Mime\MessageConverter;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 use Symfony\Contracts\HttpClient\HttpClientInterface;
 
 /**
diff --git a/src/Symfony/Component/Mailer/Transport/SendmailTransport.php b/src/Symfony/Component/Mailer/Transport/SendmailTransport.php
index b8b4512a3603..732e33673583 100644
--- a/src/Symfony/Component/Mailer/Transport/SendmailTransport.php
+++ b/src/Symfony/Component/Mailer/Transport/SendmailTransport.php
@@ -12,13 +12,13 @@
 namespace Symfony\Component\Mailer\Transport;
 
 use Psr\Log\LoggerInterface;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\Mailer\SentMessage;
 use Symfony\Component\Mailer\SmtpEnvelope;
 use Symfony\Component\Mailer\Transport\Smtp\SmtpTransport;
 use Symfony\Component\Mailer\Transport\Smtp\Stream\AbstractStream;
 use Symfony\Component\Mailer\Transport\Smtp\Stream\ProcessStream;
 use Symfony\Component\Mime\RawMessage;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 
 /**
  * SendmailTransport for sending mail through a Sendmail/Postfix (etc..) binary.
diff --git a/src/Symfony/Component/Mailer/Transport/Smtp/EsmtpTransport.php b/src/Symfony/Component/Mailer/Transport/Smtp/EsmtpTransport.php
index d3a93debd1dc..6db5b1f80003 100644
--- a/src/Symfony/Component/Mailer/Transport/Smtp/EsmtpTransport.php
+++ b/src/Symfony/Component/Mailer/Transport/Smtp/EsmtpTransport.php
@@ -12,11 +12,11 @@
 namespace Symfony\Component\Mailer\Transport\Smtp;
 
 use Psr\Log\LoggerInterface;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\Mailer\Exception\TransportException;
 use Symfony\Component\Mailer\Exception\TransportExceptionInterface;
 use Symfony\Component\Mailer\Transport\Smtp\Auth\AuthenticatorInterface;
 use Symfony\Component\Mailer\Transport\Smtp\Stream\SocketStream;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 
 /**
  * Sends Emails over SMTP with ESMTP support.
diff --git a/src/Symfony/Component/Mailer/Transport/Smtp/SmtpTransport.php b/src/Symfony/Component/Mailer/Transport/Smtp/SmtpTransport.php
index 05bbc0df59b6..50e466fe4125 100644
--- a/src/Symfony/Component/Mailer/Transport/Smtp/SmtpTransport.php
+++ b/src/Symfony/Component/Mailer/Transport/Smtp/SmtpTransport.php
@@ -12,7 +12,6 @@
 namespace Symfony\Component\Mailer\Transport\Smtp;
 
 use Psr\Log\LoggerInterface;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\Mailer\Exception\LogicException;
 use Symfony\Component\Mailer\Exception\TransportException;
 use Symfony\Component\Mailer\Exception\TransportExceptionInterface;
@@ -22,6 +21,7 @@
 use Symfony\Component\Mailer\Transport\Smtp\Stream\AbstractStream;
 use Symfony\Component\Mailer\Transport\Smtp\Stream\SocketStream;
 use Symfony\Component\Mime\RawMessage;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 
 /**
  * Sends emails over SMTP.
diff --git a/src/Symfony/Component/Mailer/composer.json b/src/Symfony/Component/Mailer/composer.json
index 1de10720befe..31a9360564d9 100644
--- a/src/Symfony/Component/Mailer/composer.json
+++ b/src/Symfony/Component/Mailer/composer.json
@@ -23,13 +23,13 @@
         "symfony/mime": "^4.3|^5.0"
     },
     "require-dev": {
-        "symfony/amazon-mailer": "^4.3|^5.0",
-        "symfony/google-mailer": "^4.3|^5.0",
+        "symfony/amazon-mailer": "^4.4|^5.0",
+        "symfony/google-mailer": "^4.4|^5.0",
         "symfony/http-client-contracts": "^1.1",
-        "symfony/mailgun-mailer": "^4.3|^5.0",
-        "symfony/mailchimp-mailer": "^4.3|^5.0",
-        "symfony/postmark-mailer": "^4.3|^5.0",
-        "symfony/sendgrid-mailer": "^4.3|^5.0"
+        "symfony/mailgun-mailer": "^4.4|^5.0",
+        "symfony/mailchimp-mailer": "^4.4|^5.0",
+        "symfony/postmark-mailer": "^4.4|^5.0",
+        "symfony/sendgrid-mailer": "^4.4|^5.0"
     },
     "autoload": {
         "psr-4": { "Symfony\\Component\\Mailer\\": "" },