diff --git a/src/Symfony/Component/String/AbstractString.php b/src/Symfony/Component/String/AbstractString.php
index 47deb5aba2..bdae34dd8b 100644
--- a/src/Symfony/Component/String/AbstractString.php
+++ b/src/Symfony/Component/String/AbstractString.php
@@ -26,8 +26,6 @@ use Symfony\Component\String\Exception\RuntimeException;
  * @author Hugo Hamon <hugohamon@neuf.fr>
  *
  * @throws ExceptionInterface
- *
- * @experimental in 5.0
  */
 abstract class AbstractString implements \JsonSerializable
 {
diff --git a/src/Symfony/Component/String/AbstractUnicodeString.php b/src/Symfony/Component/String/AbstractUnicodeString.php
index 5b8b87252f..95afa624d9 100644
--- a/src/Symfony/Component/String/AbstractUnicodeString.php
+++ b/src/Symfony/Component/String/AbstractUnicodeString.php
@@ -25,8 +25,6 @@ use Symfony\Component\String\Exception\RuntimeException;
  * @author Nicolas Grekas <p@tchwork.com>
  *
  * @throws ExceptionInterface
- *
- * @experimental in 5.0
  */
 abstract class AbstractUnicodeString extends AbstractString
 {
diff --git a/src/Symfony/Component/String/ByteString.php b/src/Symfony/Component/String/ByteString.php
index eb42893a14..b810be1338 100644
--- a/src/Symfony/Component/String/ByteString.php
+++ b/src/Symfony/Component/String/ByteString.php
@@ -22,8 +22,6 @@ use Symfony\Component\String\Exception\RuntimeException;
  * @author Hugo Hamon <hugohamon@neuf.fr>
  *
  * @throws ExceptionInterface
- *
- * @experimental in 5.0
  */
 class ByteString extends AbstractString
 {
diff --git a/src/Symfony/Component/String/CHANGELOG.md b/src/Symfony/Component/String/CHANGELOG.md
index e591d83c34..af29651c63 100644
--- a/src/Symfony/Component/String/CHANGELOG.md
+++ b/src/Symfony/Component/String/CHANGELOG.md
@@ -7,6 +7,7 @@ CHANGELOG
  * added the `AbstractString::reverse()` method
  * made `AbstractString::width()` follow POSIX.1-2001
  * added `LazyString` which provides memoizing stringable objects
+ * The component is not marked as `@experimental` anymore.
 
 5.0.0
 -----
diff --git a/src/Symfony/Component/String/CodePointString.php b/src/Symfony/Component/String/CodePointString.php
index d1ac915701..8f0034ac90 100644
--- a/src/Symfony/Component/String/CodePointString.php
+++ b/src/Symfony/Component/String/CodePointString.php
@@ -21,8 +21,6 @@ use Symfony\Component\String\Exception\InvalidArgumentException;
  * @author Hugo Hamon <hugohamon@neuf.fr>
  *
  * @throws ExceptionInterface
- *
- * @experimental in 5.0
  */
 class CodePointString extends AbstractUnicodeString
 {
diff --git a/src/Symfony/Component/String/Exception/ExceptionInterface.php b/src/Symfony/Component/String/Exception/ExceptionInterface.php
index e10a3f030b..361978656b 100644
--- a/src/Symfony/Component/String/Exception/ExceptionInterface.php
+++ b/src/Symfony/Component/String/Exception/ExceptionInterface.php
@@ -11,9 +11,6 @@
 
 namespace Symfony\Component\String\Exception;
 
-/**
- * @experimental in 5.0
- */
 interface ExceptionInterface extends \Throwable
 {
 }
diff --git a/src/Symfony/Component/String/Exception/InvalidArgumentException.php b/src/Symfony/Component/String/Exception/InvalidArgumentException.php
index fff6207f9c..6aa586bcf9 100644
--- a/src/Symfony/Component/String/Exception/InvalidArgumentException.php
+++ b/src/Symfony/Component/String/Exception/InvalidArgumentException.php
@@ -11,9 +11,6 @@
 
 namespace Symfony\Component\String\Exception;
 
-/**
- * @experimental in 5.0
- */
 class InvalidArgumentException extends \InvalidArgumentException implements ExceptionInterface
 {
 }
diff --git a/src/Symfony/Component/String/Exception/RuntimeException.php b/src/Symfony/Component/String/Exception/RuntimeException.php
index 747db4dc9d..77cb091f9c 100644
--- a/src/Symfony/Component/String/Exception/RuntimeException.php
+++ b/src/Symfony/Component/String/Exception/RuntimeException.php
@@ -11,9 +11,6 @@
 
 namespace Symfony\Component\String\Exception;
 
-/**
- * @experimental in 5.0
- */
 class RuntimeException extends \RuntimeException implements ExceptionInterface
 {
 }
diff --git a/src/Symfony/Component/String/README.md b/src/Symfony/Component/String/README.md
index 4f3992a0b4..23ad86ad8f 100644
--- a/src/Symfony/Component/String/README.md
+++ b/src/Symfony/Component/String/README.md
@@ -4,11 +4,6 @@ String Component
 The String component provides an object-oriented API to strings and deals
 with bytes, UTF-8 code points and grapheme clusters in a unified way.
 
-**This component is experimental**.
-[Experimental features](https://symfony.com/doc/current/contributing/code/experimental.html)
-are not covered by Symfony's
-[Backward Compatibility Promise](https://symfony.com/doc/current/contributing/code/bc.html).
-
 Resources
 ---------
 
diff --git a/src/Symfony/Component/String/Resources/functions.php b/src/Symfony/Component/String/Resources/functions.php
index 739b216e4f..6b05c461ae 100644
--- a/src/Symfony/Component/String/Resources/functions.php
+++ b/src/Symfony/Component/String/Resources/functions.php
@@ -11,17 +11,11 @@
 
 namespace Symfony\Component\String;
 
-/**
- * @experimental in 5.0
- */
 function u(string $string = ''): UnicodeString
 {
     return new UnicodeString($string);
 }
 
-/**
- * @experimental in 5.0
- */
 function b(string $string = ''): ByteString
 {
     return new ByteString($string);
diff --git a/src/Symfony/Component/String/Slugger/AsciiSlugger.php b/src/Symfony/Component/String/Slugger/AsciiSlugger.php
index 5a33c465aa..cb6f5b2b12 100644
--- a/src/Symfony/Component/String/Slugger/AsciiSlugger.php
+++ b/src/Symfony/Component/String/Slugger/AsciiSlugger.php
@@ -17,8 +17,6 @@ use Symfony\Contracts\Translation\LocaleAwareInterface;
 
 /**
  * @author Titouan Galopin <galopintitouan@gmail.com>
- *
- * @experimental in 5.0
  */
 class AsciiSlugger implements SluggerInterface, LocaleAwareInterface
 {
diff --git a/src/Symfony/Component/String/Slugger/SluggerInterface.php b/src/Symfony/Component/String/Slugger/SluggerInterface.php
index 35d96d044c..c679ed9331 100644
--- a/src/Symfony/Component/String/Slugger/SluggerInterface.php
+++ b/src/Symfony/Component/String/Slugger/SluggerInterface.php
@@ -17,8 +17,6 @@ use Symfony\Component\String\AbstractUnicodeString;
  * Creates a URL-friendly slug from a given string.
  *
  * @author Titouan Galopin <galopintitouan@gmail.com>
- *
- * @experimental in 5.0
  */
 interface SluggerInterface
 {
diff --git a/src/Symfony/Component/String/UnicodeString.php b/src/Symfony/Component/String/UnicodeString.php
index ada77caaae..485d6f0e2d 100644
--- a/src/Symfony/Component/String/UnicodeString.php
+++ b/src/Symfony/Component/String/UnicodeString.php
@@ -29,8 +29,6 @@ use Symfony\Component\String\Exception\InvalidArgumentException;
  * @author Hugo Hamon <hugohamon@neuf.fr>
  *
  * @throws ExceptionInterface
- *
- * @experimental in 5.0
  */
 class UnicodeString extends AbstractUnicodeString
 {