diff --git a/UPGRADE-5.0.md b/UPGRADE-5.0.md
index 3fcbebac66..d41330e3fd 100644
--- a/UPGRADE-5.0.md
+++ b/UPGRADE-5.0.md
@@ -252,6 +252,8 @@ FrameworkBundle
  * Support for the legacy directory structure in `translation:update` and `debug:translation` commands has been removed.
  * Removed the "Psr\SimpleCache\CacheInterface" / "cache.app.simple" service, use "Symfony\Contracts\Cache\CacheInterface" / "cache.app" instead.
  * Removed support for `templating` engine in `TemplateController`, use Twig instead
+ * Removed `ResolveControllerNameSubscriber`.
+ * Removed `routing.loader.service`.
 
 HttpClient
 ----------
@@ -299,6 +301,7 @@ HttpKernel
  * Removed `PostResponseEvent`, use `TerminateEvent` instead
  * Removed `TranslatorListener` in favor of `LocaleAwareListener`
  * The `DebugHandlersListener` class has been made `final`
+ * Removed `SaveSessionListener` in favor of `AbstractSessionListener`
 
 Intl
 ----
@@ -368,6 +371,7 @@ Routing
  * `Serializable` implementing methods for `Route` and `CompiledRoute` are final.
    Instead of overwriting them, use `__serialize` and `__unserialize` as extension points which are forward compatible
    with the new serialization methods in PHP 7.4.
+ * Removed `ServiceRouterLoader` and `ObjectRouteLoader`.
 
 Security
 --------
@@ -451,7 +455,32 @@ SecurityBundle
 Serializer
 ----------
 
+ * The default value of the `CsvEncoder` "as_collection" option was changed to `true`.
+ * Individual encoders & normalizers options as constructor arguments were removed.
+   Use the default context instead.
+ * The following method and properties:
+     - `AbstractNormalizer::$circularReferenceLimit`
+     - `AbstractNormalizer::$circularReferenceHandler`
+     - `AbstractNormalizer::$callbacks`
+     - `AbstractNormalizer::$ignoredAttributes`
+     - `AbstractNormalizer::$camelizedAttributes`
+     - `AbstractNormalizer::setCircularReferenceLimit()`
+     - `AbstractNormalizer::setCircularReferenceHandler()`
+     - `AbstractNormalizer::setCallbacks()`
+     - `AbstractNormalizer::setIgnoredAttributes()`
+     - `AbstractObjectNormalizer::$maxDepthHandler`
+     - `AbstractObjectNormalizer::setMaxDepthHandler()`
+     - `XmlEncoder::setRootNodeName()`
+     - `XmlEncoder::getRootNodeName()`
+
+   were removed, use the default context instead.
  * The `AbstractNormalizer::handleCircularReference()` method has two new `$format` and `$context` arguments.
+ * Removed support for instantiating a `DataUriNormalizer` with a default MIME type guesser when the `symfony/mime` component isn't installed.
+
+Stopwatch
+---------
+
+ * Removed support for passing `null` as 1st (`$id`) argument of `Section::get()` method, pass a valid child section identifier instead.
 
 Translation
 -----------
@@ -496,6 +525,7 @@ Validator
  * The `symfony/intl` component is now required for using the `Bic`, `Country`, `Currency`, `Language` and `Locale` constraints
  * The `egulias/email-validator` component is now required for using the `Email` constraint in strict mode
  * The `symfony/expression-language` component is now required for using the `Expression` constraint
+ * Changed the default value of `Length::$allowEmptyString` to `false` and made it optional
 
 WebProfilerBundle
 -----------------