diff --git a/Setup/InstallSchema.php b/Setup/InstallSchema.php
deleted file mode 100644
index ea80168..0000000
--- a/Setup/InstallSchema.php
+++ /dev/null
@@ -1,30 +0,0 @@
-<?php
-namespace BulkGate\Magesms\Setup;
-
-use Magento\Framework\Setup\InstallSchemaInterface;
-use Magento\Framework\Setup\ModuleContextInterface;
-use Magento\Framework\Setup\SchemaSetupInterface;
-use BulkGate\Magesms\Bulkgate\DIContainer;
-
-/**
- * Class InstallSchema
- * @package BulkGate\Magesms\Setup
- */
-class InstallSchema implements InstallSchemaInterface
-{
-    private $dIContainer;
-
-    public function __construct(DIContainer $DIContainer)
-    {
-        $this->dIContainer = $DIContainer;
-    }
-
-    public function install(SchemaSetupInterface $setup, ModuleContextInterface $context)
-    {
-        $setup->startSetup();
-
-        $this->dIContainer->getSettings()->install();
-
-        $setup->endSetup();
-    }
-}
diff --git a/Setup/UpgradeSchema.php b/Setup/UpgradeSchema.php
deleted file mode 100644
index 249d15c..0000000
--- a/Setup/UpgradeSchema.php
+++ /dev/null
@@ -1,40 +0,0 @@
-<?php
-namespace BulkGate\Magesms\Setup;
-
-use BulkGate\Magesms\Bulkgate\DIContainer;
-use Magento\Framework\Setup\ModuleContextInterface;
-use Magento\Framework\Setup\SchemaSetupInterface;
-use Magento\Framework\Setup\UpgradeSchemaInterface;
-
-/**
- * Class UpgradeSchema
- * @package BulkGate\Magesms\Setup
- */
-class UpgradeSchema implements UpgradeSchemaInterface
-{
-    private $dIContainer;
-
-    public function __construct(DIContainer $DIContainer)
-    {
-        $this->dIContainer = $DIContainer;
-    }
-
-    /**
-     * @param SchemaSetupInterface $setup
-     * @param ModuleContextInterface $context
-     */
-    public function upgrade(SchemaSetupInterface $setup, ModuleContextInterface $context)
-    {
-        $setup->startSetup();
-        if (version_compare($context->getVersion(), '3.0.7', '<')) {
-            if (!$setup->tableExists('bulkgate_module')) {
-                try {
-                    $setup->run("RENAME TABLE `bulkgate_module` TO {$setup->getTable('bulkgate_module')}");
-                } catch (\Exception $e) {
-                    $this->dIContainer->getSettings()->install();
-                }
-            }
-        }
-        $setup->endSetup();
-    }
-}
diff --git a/etc/db_schema.xml b/etc/db_schema.xml
new file mode 100644
index 0000000..1fc9f89
--- /dev/null
+++ b/etc/db_schema.xml
@@ -0,0 +1,17 @@
+<?xml version="1.0"?>
+<schema xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xsi:noNamespaceSchemaLocation="urn:magento:framework:Setup/Declaration/Schema/etc/schema.xsd">
+    <table name="bulkgate_module" resource="default" engine="innodb">
+        <column xsi:type="varchar" name="scope" nullable="false" length="50" default="main"/>
+        <column xsi:type="varchar" name="key" nullable="false" length="50"/>
+        <column xsi:type="varchar" name="type" nullable="false" length="50" default="text"/>
+        <column xsi:type="text" name="value" nullable="false" default=""/>
+        <column xsi:type="bigint" name="datetime" nullable="false" />
+        <column xsi:type="int" name="order" nullable="false" default="0" />
+        <column xsi:type="varchar" name="synchronize_flag" nullable="false" length="50" default="none" />
+        <constraint xsi:type="primary" referenceId="PRIMARY">
+            <column name="scope"/>
+            <column name="key"/>
+        </constraint>
+    </table>
+</schema>