diff --git a/UPGRADE.md b/UPGRADE.md
index 6479312d553..5c22213f691 100644
--- a/UPGRADE.md
+++ b/UPGRADE.md
@@ -45,9 +45,12 @@ The following PDO-related classes outside of the PDO namespace have been depreca
 1. `DBALException::invalidPlatformType()` is deprecated as unused as of v2.7.0.
 2. `DBALException::invalidPdoInstance()` as passing a PDO instance via configuration is deprecated.
 
-## `AbstractPlatform::fixSchemaElementName()` is deprecated.
+## Deprecated `AbstractPlatform` methods.
 
-The method is not used anywhere except for tests.
+1. `fixSchemaElementName()`.
+2. `getSQLResultCasing()`.
+3. `prefersSequences()`.
+4. `supportsForeignKeyOnUpdate()`.
 
 ##`ServerInfoAwareConnection::requiresQueryForServerVersion()` is deprecated.
 
diff --git a/lib/Doctrine/DBAL/Platforms/AbstractPlatform.php b/lib/Doctrine/DBAL/Platforms/AbstractPlatform.php
index 3becfb65d13..ec2aab5ce5c 100644
--- a/lib/Doctrine/DBAL/Platforms/AbstractPlatform.php
+++ b/lib/Doctrine/DBAL/Platforms/AbstractPlatform.php
@@ -2651,6 +2651,8 @@ public function getColumnCollationDeclarationSQL($collation)
      * Whether the platform prefers sequences for ID generation.
      * Subclasses should override this method to return TRUE if they prefer sequences.
      *
+     * @deprecated
+     *
      * @return bool
      */
     public function prefersSequences()
@@ -3230,6 +3232,8 @@ public function supportsCreateDropForeignKeyConstraints(): bool
     /**
      * Whether this platform supports onUpdate in foreign key constraints.
      *
+     * @deprecated
+     *
      * @return bool
      */
     public function supportsForeignKeyOnUpdate()
@@ -3481,6 +3485,8 @@ public function supportsLimitOffset()
     /**
      * Gets the character casing of a column in an SQL result set of this platform.
      *
+     * @deprecated
+     *
      * @param string $column The column name for which to get the correct character casing.
      *
      * @return string The column name in the character casing used in SQL result sets.
diff --git a/lib/Doctrine/DBAL/Platforms/DB2Platform.php b/lib/Doctrine/DBAL/Platforms/DB2Platform.php
index 9b9a0622b62..0b6c38e0afb 100644
--- a/lib/Doctrine/DBAL/Platforms/DB2Platform.php
+++ b/lib/Doctrine/DBAL/Platforms/DB2Platform.php
@@ -864,6 +864,8 @@ public function prefersIdentityColumns()
      * {@inheritDoc}
      *
      * DB2 returns all column names in SQL result sets in uppercase.
+     *
+     * @deprecated
      */
     public function getSQLResultCasing($column)
     {
diff --git a/lib/Doctrine/DBAL/Platforms/OraclePlatform.php b/lib/Doctrine/DBAL/Platforms/OraclePlatform.php
index faf76de197b..ccf1e600822 100644
--- a/lib/Doctrine/DBAL/Platforms/OraclePlatform.php
+++ b/lib/Doctrine/DBAL/Platforms/OraclePlatform.php
@@ -968,6 +968,8 @@ protected function getRenameIndexSQL($oldIndexName, Index $index, $tableName)
 
     /**
      * {@inheritDoc}
+     *
+     * @deprecated
      */
     public function prefersSequences()
     {
@@ -1055,6 +1057,8 @@ protected function doModifyLimitQuery($query, $limit, $offset = null)
      * {@inheritDoc}
      *
      * Oracle returns all column names in SQL result sets in uppercase.
+     *
+     * @deprecated
      */
     public function getSQLResultCasing($column)
     {
@@ -1126,6 +1130,8 @@ public function supportsSequences()
 
     /**
      * {@inheritDoc}
+     *
+     * @deprecated
      */
     public function supportsForeignKeyOnUpdate()
     {
diff --git a/lib/Doctrine/DBAL/Platforms/PostgreSqlPlatform.php b/lib/Doctrine/DBAL/Platforms/PostgreSqlPlatform.php
index db9bec13d52..9d5b88cc344 100644
--- a/lib/Doctrine/DBAL/Platforms/PostgreSqlPlatform.php
+++ b/lib/Doctrine/DBAL/Platforms/PostgreSqlPlatform.php
@@ -210,6 +210,8 @@ public function supportsCommentOnStatement()
 
     /**
      * {@inheritDoc}
+     *
+     * @deprecated
      */
     public function prefersSequences()
     {
@@ -1090,6 +1092,8 @@ public function getName()
      * {@inheritDoc}
      *
      * PostgreSQL returns all column names in SQL result sets in lowercase.
+     *
+     * @deprecated
      */
     public function getSQLResultCasing($column)
     {