diff --git a/composer.json b/composer.json
index 9acb6b76..4a78a17a 100755
--- a/composer.json
+++ b/composer.json
@@ -35,7 +35,7 @@
     },
     "require": {
         "php": "^8.2",
-        "pimcore/pimcore": "^11.0",
+        "pimcore/pimcore": "^12.0",
         "symfony/form": "^6.4",
         "symfony/intl": "^6.4",
         "doctrine/orm": "^2.7 || ^3.0"
diff --git a/config/doctrine/model/DoubleOptInSession.orm.xml b/config/doctrine/model/DoubleOptInSession.orm.xml
index 102e535e..181c0447 100644
--- a/config/doctrine/model/DoubleOptInSession.orm.xml
+++ b/config/doctrine/model/DoubleOptInSession.orm.xml
@@ -11,7 +11,7 @@
             <custom-id-generator class="Symfony\Bridge\Doctrine\IdGenerator\UuidGenerator"/>
         </id>
         <field name="email" type="string" column="email" length="190" nullable="false"/>
-        <field name="additionalData" type="array" column="additional_data" nullable="true"/>
+        <field name="additionalData" type="json" column="additional_data" nullable="true"/>
         <field name="dispatchLocation" type="text" column="dispatch_location" nullable="true"/>
         <field name="applied" type="boolean" column="applied">
             <options>
diff --git a/config/doctrine/model/FormDefinition.orm.xml b/config/doctrine/model/FormDefinition.orm.xml
index 387884d3..87a99ffc 100644
--- a/config/doctrine/model/FormDefinition.orm.xml
+++ b/config/doctrine/model/FormDefinition.orm.xml
@@ -12,8 +12,8 @@
         <field name="modificationDate" type="datetime" column="modificationDate" nullable="false"/>
         <field name="createdBy" type="integer" column="createdBy"/>
         <field name="modifiedBy" type="integer" column="modifiedBy"/>
-        <field name="configuration" type="object" column="configuration" nullable="true"/>
-        <field name="conditionalLogic" type="object" column="conditionalLogic" nullable="true"/>
+        <field name="configuration" type="json" column="configuration" nullable="true"/>
+        <field name="conditionalLogic" type="json" column="conditionalLogic" nullable="true"/>
         <field name="fields" type="form_builder_fields" column="fields" nullable="true"/>
         <one-to-many field="outputWorkflows" target-entity="FormBuilderBundle\Model\OutputWorkflow" mapped-by="formDefinition"
                      fetch="LAZY">
diff --git a/config/doctrine/model/OutputWorkflow.orm.xml b/config/doctrine/model/OutputWorkflow.orm.xml
index fb1cc614..6cabdab0 100644
--- a/config/doctrine/model/OutputWorkflow.orm.xml
+++ b/config/doctrine/model/OutputWorkflow.orm.xml
@@ -11,7 +11,7 @@
         </id>
         <field name="name" type="string" column="`name`" length="190" nullable="true"/>
         <field name="funnelWorkflow" type="boolean" column="funnel_workflow" nullable="false"/>
-        <field name="successManagement" type="object" column="success_management" nullable="true"/>
+        <field name="successManagement" type="json" column="success_management" nullable="true"/>
         <one-to-many field="channels" target-entity="FormBuilderBundle\Model\OutputWorkflowChannel" mapped-by="outputWorkflow"
                      orphan-removal="true" fetch="LAZY">
             <cascade>
diff --git a/config/doctrine/model/OutputWorkflowChannel.orm.xml b/config/doctrine/model/OutputWorkflowChannel.orm.xml
index 0df61746..5ad71956 100644
--- a/config/doctrine/model/OutputWorkflowChannel.orm.xml
+++ b/config/doctrine/model/OutputWorkflowChannel.orm.xml
@@ -11,8 +11,8 @@
         </id>
         <field name="type" type="string" column="type" length="190"/>
         <field name="name" type="string" column="name" length="190"/>
-        <field name="configuration" type="object" column="configuration" nullable="true"/>
-        <field name="funnelActions" type="object" column="funnel_actions" nullable="true"/>
+        <field name="configuration" type="json" column="configuration" nullable="true"/>
+        <field name="funnelActions" type="json" column="funnel_actions" nullable="true"/>
         <many-to-one field="outputWorkflow" target-entity="FormBuilderBundle\Model\OutputWorkflow" inversed-by="channels"
                      fetch="LAZY">
             <join-columns>
diff --git a/src/Form/Type/SnippetType.php b/src/Form/Type/SnippetType.php
index ad810e0e..3b642ca6 100644
--- a/src/Form/Type/SnippetType.php
+++ b/src/Form/Type/SnippetType.php
@@ -56,7 +56,7 @@ public function buildView(FormView $view, FormInterface $form, array $options):
         $view->vars = $vars;
     }
 
-    private function getSnippetId(array $data): ?string
+    private function getSnippetId(array $data): ?int
     {
         $locale = $this->requestStack->getMainRequest()->getLocale();
 
diff --git a/src/Migrations/Version20250911163105.php b/src/Migrations/Version20250911163105.php
new file mode 100644
index 00000000..e63d3fab
--- /dev/null
+++ b/src/Migrations/Version20250911163105.php
@@ -0,0 +1,83 @@
+<?php
+
+namespace FormBuilderBundle\Migrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+use Symfony\Component\DependencyInjection\ContainerAwareInterface;
+use Symfony\Component\DependencyInjection\ContainerAwareTrait;
+
+class Version20250911163105 extends AbstractMigration implements ContainerAwareInterface
+{
+    use ContainerAwareTrait;
+
+    public function getDescription(): string
+    {
+        return 'Migrate all formbuilder object type columns to json format';
+    }
+
+    public function up(Schema $schema): void
+    {
+        $connection = $this->connection;
+
+        $this->migrateTable($connection, 'formbuilder_forms', ['configuration', 'conditionalLogic'], 'id');
+        $this->migrateTable($connection, 'formbuilder_output_workflow', ['success_management'], 'id');
+        $this->migrateTable($connection, 'formbuilder_output_workflow_channel', ['configuration', 'funnel_actions'], 'id');
+        $this->migrateTable($connection, 'formbuilder_double_opt_in_session', ['additional_data'], 'token');
+
+        // Change column types to JSON
+        $this->addSql('ALTER TABLE formbuilder_forms MODIFY COLUMN configuration JSON');
+        $this->addSql('ALTER TABLE formbuilder_forms MODIFY COLUMN conditionalLogic JSON');
+        $this->addSql('ALTER TABLE formbuilder_output_workflow MODIFY COLUMN success_management JSON');
+        $this->addSql('ALTER TABLE formbuilder_output_workflow_channel MODIFY COLUMN configuration JSON');
+        $this->addSql('ALTER TABLE formbuilder_output_workflow_channel MODIFY COLUMN funnel_actions JSON');
+        $this->addSql('ALTER TABLE formbuilder_double_opt_in_session MODIFY COLUMN additional_data JSON');
+    }
+
+    private function migrateTable($connection, $tableName, $columns, $primaryKey = 'id'): void
+    {
+        $columnList = implode(', ', $columns);
+        $conditions = array_map(fn($col) => "$col IS NOT NULL", $columns);
+        $whereClause = implode(' OR ', $conditions);
+
+        $result = $connection->executeQuery("SELECT $primaryKey, $columnList FROM $tableName WHERE $whereClause");
+
+        while ($row = $result->fetchAssociative()) {
+            $updates = [];
+            $values = [];
+
+            foreach ($columns as $column) {
+                if (!empty($row[$column])) {
+                    $unserialized = @unserialize($row[$column]);
+                    if ($unserialized !== false) {
+                        $updates[] = "$column = ?";
+                        $values[] = json_encode($unserialized);
+                    } elseif ($row[$column] === '[]') {
+                        $updates[] = "$column = ?";
+                        $values[] = '[]';
+                    } elseif ($row[$column] === '{}') {
+                        $updates[] = "$column = ?";
+                        $values[] = '{}';
+                    }
+                } else {
+                    $updates[] = "$column = ?";
+                    $values[] = null;
+                }
+            }
+
+            if (!empty($updates)) {
+                $values[] = $row[$primaryKey];
+                $connection->executeStatement(
+                    "UPDATE $tableName SET " . implode(', ', $updates) . " WHERE $primaryKey = ?",
+                    $values
+                );
+            }
+        }
+    }
+
+    public function down(Schema $schema): void
+    {
+        // This migration is not reversible because we are converting serialized data to JSON
+        $this->throwIrreversibleMigrationException();
+    }
+}