diff --git a/src/Symfony/Component/Notifier/Bridge/LinkedIn/CHANGELOG.md b/src/Symfony/Component/Notifier/Bridge/LinkedIn/CHANGELOG.md
index d8e243dcb9..d61929abd6 100644
--- a/src/Symfony/Component/Notifier/Bridge/LinkedIn/CHANGELOG.md
+++ b/src/Symfony/Component/Notifier/Bridge/LinkedIn/CHANGELOG.md
@@ -5,6 +5,7 @@ CHANGELOG
 -----
 
  * The bridge is not marked as `@experimental` anymore
+* [BC BREAK] `LinkedInTransportFactory` is now final
 
 5.2.0
 -----
diff --git a/src/Symfony/Component/Notifier/Bridge/LinkedIn/LinkedInTransportFactory.php b/src/Symfony/Component/Notifier/Bridge/LinkedIn/LinkedInTransportFactory.php
index c3dfc7357e..f052e28e29 100644
--- a/src/Symfony/Component/Notifier/Bridge/LinkedIn/LinkedInTransportFactory.php
+++ b/src/Symfony/Component/Notifier/Bridge/LinkedIn/LinkedInTransportFactory.php
@@ -19,7 +19,7 @@ use Symfony\Component\Notifier\Transport\TransportInterface;
 /**
  * @author Smaïne Milianni <smaine.milianni@gmail.com>
  */
-class LinkedInTransportFactory extends AbstractTransportFactory
+final class LinkedInTransportFactory extends AbstractTransportFactory
 {
     public function create(Dsn $dsn): TransportInterface
     {
diff --git a/src/Symfony/Component/Notifier/Bridge/Smsapi/CHANGELOG.md b/src/Symfony/Component/Notifier/Bridge/Smsapi/CHANGELOG.md
new file mode 100644
index 0000000000..ee65aa9b4a
--- /dev/null
+++ b/src/Symfony/Component/Notifier/Bridge/Smsapi/CHANGELOG.md
@@ -0,0 +1,7 @@
+CHANGELOG
+=========
+
+5.3.0
+-----
+
+ * Added the bridge
diff --git a/src/Symfony/Component/Notifier/Bridge/Smsapi/SmsapiTransport.php b/src/Symfony/Component/Notifier/Bridge/Smsapi/SmsapiTransport.php
index 79df322bf1..61595a6079 100644
--- a/src/Symfony/Component/Notifier/Bridge/Smsapi/SmsapiTransport.php
+++ b/src/Symfony/Component/Notifier/Bridge/Smsapi/SmsapiTransport.php
@@ -22,6 +22,8 @@ use Symfony\Contracts\HttpClient\HttpClientInterface;
 
 /**
  * @author Marcin Szepczynski <szepczynski@gmail.com>
+ *
+ * @experimental in 5.3
  */
 final class SmsapiTransport extends AbstractTransport
 {
diff --git a/src/Symfony/Component/Notifier/Bridge/Smsapi/SmsapiTransportFactory.php b/src/Symfony/Component/Notifier/Bridge/Smsapi/SmsapiTransportFactory.php
index 5ce2562320..6f3e42d979 100644
--- a/src/Symfony/Component/Notifier/Bridge/Smsapi/SmsapiTransportFactory.php
+++ b/src/Symfony/Component/Notifier/Bridge/Smsapi/SmsapiTransportFactory.php
@@ -19,8 +19,10 @@ use Symfony\Component\Notifier\Transport\TransportInterface;
 
 /**
  * @author Marcin Szepczynski <szepczynski@gmail.com>
+ *
+ * @experimental in 5.3
  */
-class SmsapiTransportFactory extends AbstractTransportFactory
+final class SmsapiTransportFactory extends AbstractTransportFactory
 {
     /**
      * @return SmsapiTransport
diff --git a/src/Symfony/Component/Notifier/Bridge/Zulip/CHANGELOG.md b/src/Symfony/Component/Notifier/Bridge/Zulip/CHANGELOG.md
index d8e243dcb9..b4a92ac9bd 100644
--- a/src/Symfony/Component/Notifier/Bridge/Zulip/CHANGELOG.md
+++ b/src/Symfony/Component/Notifier/Bridge/Zulip/CHANGELOG.md
@@ -5,6 +5,8 @@ CHANGELOG
 -----
 
  * The bridge is not marked as `@experimental` anymore
+* [BC BREAK] `ZulipTransport` is now final
+* [BC BREAK] `ZulipTransportFactory` is now final
 
 5.2.0
 -----
diff --git a/src/Symfony/Component/Notifier/Bridge/Zulip/ZulipTransport.php b/src/Symfony/Component/Notifier/Bridge/Zulip/ZulipTransport.php
index 32102dc834..82290188ea 100644
--- a/src/Symfony/Component/Notifier/Bridge/Zulip/ZulipTransport.php
+++ b/src/Symfony/Component/Notifier/Bridge/Zulip/ZulipTransport.php
@@ -24,7 +24,7 @@ use Symfony\Contracts\HttpClient\HttpClientInterface;
 /**
  * @author Mohammad Emran Hasan <phpfour@gmail.com>
  */
-class ZulipTransport extends AbstractTransport
+final class ZulipTransport extends AbstractTransport
 {
     private $email;
     private $token;
diff --git a/src/Symfony/Component/Notifier/Bridge/Zulip/ZulipTransportFactory.php b/src/Symfony/Component/Notifier/Bridge/Zulip/ZulipTransportFactory.php
index 9ea1ec66a9..3914202529 100644
--- a/src/Symfony/Component/Notifier/Bridge/Zulip/ZulipTransportFactory.php
+++ b/src/Symfony/Component/Notifier/Bridge/Zulip/ZulipTransportFactory.php
@@ -20,7 +20,7 @@ use Symfony\Component\Notifier\Transport\TransportInterface;
 /**
  * @author Mohammad Emran Hasan <phpfour@gmail.com>
  */
-class ZulipTransportFactory extends AbstractTransportFactory
+final class ZulipTransportFactory extends AbstractTransportFactory
 {
     /**
      * @return ZulipTransport