diff --git a/UPGRADE.md b/UPGRADE.md
index 14dfc24e5bc..1869e9f28ff 100644
--- a/UPGRADE.md
+++ b/UPGRADE.md
@@ -1,5 +1,9 @@
 # Upgrade to 3.2
 
+## Deprecate the `NotSupported` exception
+
+The class `Doctrine\ORM\Exception\NotSupported` is deprecated without replacement.
+
 ## Deprecate remaining `Serializable` implementation
 
 Relying on `SequenceGenerator` implementing the `Serializable` is deprecated
diff --git a/src/Exception/NotSupported.php b/src/Exception/NotSupported.php
index a061aebb0dd..9192f87520e 100644
--- a/src/Exception/NotSupported.php
+++ b/src/Exception/NotSupported.php
@@ -8,6 +8,7 @@
 
 use function sprintf;
 
+/** @deprecated */
 final class NotSupported extends LogicException implements ORMException
 {
     public static function create(): self