diff --git a/UPGRADE-4.4.md b/UPGRADE-4.4.md
index 323bf96c18a70..63456df5a9d5a 100644
--- a/UPGRADE-4.4.md
+++ b/UPGRADE-4.4.md
@@ -219,6 +219,11 @@ Security
) {}
```
+Serializer
+----------
+
+ * Deprecated the `XmlEncoder::TYPE_CASE_ATTRIBUTES` constant. Use `XmlEncoder::TYPE_CAST_ATTRIBUTES` instead.
+
Stopwatch
---------
diff --git a/UPGRADE-5.0.md b/UPGRADE-5.0.md
index e0df969c4abb0..52bccb7f24f0e 100644
--- a/UPGRADE-5.0.md
+++ b/UPGRADE-5.0.md
@@ -536,6 +536,11 @@ Serializer
* 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.
+Serializer
+----------
+
+* Removed the `XmlEncoder::TYPE_CASE_ATTRIBUTES` constant. Use `XmlEncoder::TYPE_CAST_ATTRIBUTES` instead.
+
Stopwatch
---------
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