diff --git a/UPGRADE.md b/UPGRADE.md
index dab5b16032b..5396a313e35 100644
--- a/UPGRADE.md
+++ b/UPGRADE.md
@@ -8,6 +8,13 @@ awareness about deprecated code.
 
 # Upgrade to 3.4
 
+# Deprecated `Type::getName()`
+
+This will method is not useful for the DBAL anymore, and will be removed in 4.0.
+As a consequence, depending on the name of a type being `json` for `jsonb` to
+be used for the Postgres platform is deprecated in favor of extending
+`Doctrine\DBAL\Types\JsonType`.
+
 # Deprecated `AbstractPlatform::getColumnComment()` and `AbstractPlatform::getDoctrineTypeComment()`
 
 DBAL no longer needs column comments to ensure proper diffing. Note that both
diff --git a/src/Schema/PostgreSQLSchemaManager.php b/src/Schema/PostgreSQLSchemaManager.php
index 03239bde5c2..bad1690ccad 100644
--- a/src/Schema/PostgreSQLSchemaManager.php
+++ b/src/Schema/PostgreSQLSchemaManager.php
@@ -4,6 +4,7 @@
 
 use Doctrine\DBAL\Exception;
 use Doctrine\DBAL\Platforms\PostgreSQLPlatform;
+use Doctrine\DBAL\Types\JsonType;
 use Doctrine\DBAL\Types\Type;
 use Doctrine\DBAL\Types\Types;
 use Doctrine\Deprecations\Deprecation;
@@ -15,6 +16,7 @@
 use function array_shift;
 use function assert;
 use function explode;
+use function get_class;
 use function implode;
 use function in_array;
 use function preg_match;
@@ -530,6 +532,17 @@ protected function _getPortableTableColumnDefinition($tableColumn)
         }
 
         if ($column->getType()->getName() === Types::JSON) {
+            if (! $column->getType() instanceof JsonType) {
+                Deprecation::trigger(
+                    'doctrine/dbal',
+                    'https://github.com/doctrine/dbal/pull/5049',
+                    '%s not extending %s while being named %s is deprecated, and will lead to jsonb never to being used in 4.0.',
+                    get_class($column->getType()),
+                    JsonType::class,
+                    Types::JSON
+                );
+            }
+
             $column->setPlatformOption('jsonb', $jsonb);
         }
 
diff --git a/src/Types/Type.php b/src/Types/Type.php
index c2ae2be5ad4..f9fc6d0827e 100644
--- a/src/Types/Type.php
+++ b/src/Types/Type.php
@@ -102,9 +102,9 @@ abstract public function getSQLDeclaration(array $column, AbstractPlatform $plat
     /**
      * Gets the name of this type.
      *
-     * @return string
+     * @deprecated this method will be removed in Doctrine DBAL 4.0.
      *
-     * @todo Needed?
+     * @return string
      */
     abstract public function getName();