diff --git a/.github/workflows/e2e.yml b/.github/workflows/e2e.yml
index 9985810..65c8ffa 100644
--- a/.github/workflows/e2e.yml
+++ b/.github/workflows/e2e.yml
@@ -24,7 +24,7 @@ jobs:
       matrix:
         core:
           - {name: 'WP latest', version: 'latest'}
-          - {name: 'WP minimum', version: 'WordPress/WordPress#6.1'}
+          - {name: 'WP minimum', version: 'WordPress/WordPress#6.3'}
           - {name: 'WP trunk', version: 'WordPress/WordPress#master'}
 
     steps:
diff --git a/mailchimp.php b/mailchimp.php
index 6a21644..0a77b4a 100644
--- a/mailchimp.php
+++ b/mailchimp.php
@@ -5,7 +5,7 @@
  * Description:       Add a Mailchimp signup form block, widget or shortcode to your WordPress site.
  * Text Domain:       mailchimp
  * Version:           1.6.1
- * Requires at least: 6.5
+ * Requires at least: 6.3
  * Requires PHP:      7.0
  * PHP tested up to:  8.3
  * Author:            Mailchimp
diff --git a/phpcs-compat.xml b/phpcs-compat.xml
index f425f18..5e1f0c0 100644
--- a/phpcs-compat.xml
+++ b/phpcs-compat.xml
@@ -12,6 +12,6 @@
 	<exclude-pattern>*/node_modules/*</exclude-pattern>
 	<exclude-pattern>*/vendor/*</exclude-pattern>
 
-	<config name="minimum_supported_wp_version" value="6.1"/>
+	<config name="minimum_supported_wp_version" value="6.3"/>
 	<config name="testVersion" value="7.0-"/>
 </ruleset>
diff --git a/phpcs.xml b/phpcs.xml
index 7463777..477bdbc 100644
--- a/phpcs.xml
+++ b/phpcs.xml
@@ -6,7 +6,7 @@
 
 	<exclude-pattern>*/tests/*</exclude-pattern>
 
-	<config name="minimum_supported_wp_version" value="6.1"/>
+	<config name="minimum_supported_wp_version" value="6.3"/>
 	<config name="testVersion" value="7.0-"/>
 
 	<!-- Exclude the PHPCompatibilityWP ruleset -->