diff --git a/README.md b/README.md
index 97b5ac5..1e88c72 100644
--- a/README.md
+++ b/README.md
@@ -48,7 +48,7 @@ If you are curious about the details of this plugin, read [this blog post](https
 ## Installation
 
 ```bash
-$ composer require bitbag/shipping-export-plugin
+composer require bitbag/shipping-export-plugin
 ```
 
 Add plugin dependencies to your `config/bundles.php` file:
diff --git a/composer.json b/composer.json
index 5d29d07..3e8fbbb 100644
--- a/composer.json
+++ b/composer.json
@@ -5,7 +5,7 @@
     "license": "MIT",
     "require": {
         "php": "^8.0",
-        "doctrine/dbal": "^2.7",
+        "doctrine/dbal": "^2.7 || ^3.0",
         "sylius/sylius": "~1.11.0 || ~1.12.0"
     },
     "require-dev": {
diff --git a/src/Resources/config/doctrine/ShippingGateway.orm.xml b/src/Resources/config/doctrine/ShippingGateway.orm.xml
index c9dc8ba..7bb45ad 100644
--- a/src/Resources/config/doctrine/ShippingGateway.orm.xml
+++ b/src/Resources/config/doctrine/ShippingGateway.orm.xml
@@ -12,7 +12,7 @@
 
         <field name="code" column="code" type="string" nullable="false"/>
 
-        <field name="config" column="config" type="json_array" nullable="false"/>
+        <field name="config" column="config" type="array" nullable="false"/>
 
         <field name="name" column="name" type="string" nullable="false"/>