diff --git a/changelog.txt b/changelog.txt
index 2abf929..631c596 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -1,3 +1,7 @@
+= 2.1.4 =
+
+* Updated minimum WordPress version to 5.7 (the actual code minimum, verified by static analysis).
+
 = 2.1.3 =
 
 * Fixed nonce handling in manual quota refresh to correctly handle false values returned by filter_input().
diff --git a/readme.txt b/readme.txt
index 1f5adfc..66963f4 100644
--- a/readme.txt
+++ b/readme.txt
@@ -1,11 +1,11 @@
 === SMTP (by ROBOTSTXT) Amazon SES ===
 Contributors: javiercasares
 Tags: amazon-ses, smtp, email, mail
-Requires at least: 6.5
+Requires at least: 5.7
 Tested up to: 7.1
-Stable tag: 2.1.3
+Stable tag: 2.1.4
 Requires PHP: 8.2
-Version: 2.1.3
+Version: 2.1.4
 License: GPL-3.0-or-later
 License URI: https://www.gnu.org/licenses/gpl-3.0.html
 
@@ -46,6 +46,9 @@ Yes. Network administrators can manage credentials centrally or allow individual
 
 == Changelog ==
 
+= 2.1.4 =
+* Updated minimum WordPress version to 5.7 (the actual code minimum, verified by static analysis).
+
 = 2.1.3 =
 * Fixed nonce handling in manual quota refresh to correctly handle false values returned by filter_input().
 * Fixed admin notices display to skip non-array notice entries.
diff --git a/robotstxt-smtp-amazonses.php b/robotstxt-smtp-amazonses.php
index 78423c8..04264bf 100644
--- a/robotstxt-smtp-amazonses.php
+++ b/robotstxt-smtp-amazonses.php
@@ -3,8 +3,8 @@
  * Plugin Name:       SMTP (by ROBOTSTXT) Amazon SES
  * Plugin URI:        https://git.robotstxt.es/ROBOTSTXT/robotstxt-smtp-amazonses
  * Description:       Adds Amazon SES configuration support to the ROBOTSTXT SMTP plugin.
- * Version:           2.1.3
- * Requires at least: 6.5
+ * Version:           2.1.4
+ * Requires at least: 5.7
  * Requires PHP:      8.2
  * Network:           true
  * Security:          robotstxt@robotstxt.es
@@ -26,7 +26,7 @@ if ( ! defined( 'ABSPATH' ) ) {
 }
 
 if ( ! defined( 'ROBOTSTXT_SMTP_AMAZONSES_VERSION' ) ) {
-	define( 'ROBOTSTXT_SMTP_AMAZONSES_VERSION', '2.1.3' );
+	define( 'ROBOTSTXT_SMTP_AMAZONSES_VERSION', '2.1.4' );
 }
 
 if ( ! defined( 'ROBOTSTXT_SMTP_AMAZONSES_FILE' ) ) {
diff --git a/update.json b/update.json
index fc4d31f..c148a2b 100644
--- a/update.json
+++ b/update.json
@@ -1,9 +1,9 @@
 {
   "name": "SMTP (by ROBOTSTXT) Amazon SES",
   "slug": "robotstxt-smtp-amazonses",
-  "version": "2.1.3",
-  "download_url": "https://git.robotstxt.es/ROBOTSTXT/robotstxt-smtp-amazonses/releases/download/2.1.3/robotstxt-smtp-amazonses-2.1.3.zip",
-  "requires": "6.5",
+  "version": "2.1.4",
+  "download_url": "https://git.robotstxt.es/ROBOTSTXT/robotstxt-smtp-amazonses/releases/download/2.1.4/robotstxt-smtp-amazonses-2.1.4.zip",
+  "requires": "5.7",
   "requires_php": "8.2",
   "tested": "7.1",
   "last_updated": "2026-06-09",
@@ -12,10 +12,10 @@
   "homepage": "https://git.robotstxt.es/ROBOTSTXT/robotstxt-smtp-amazonses",
   "requires_plugins": ["robotstxt-smtp"],
   "description": "Adds Amazon SES (Simple Email Service) configuration support to the ROBOTSTXT SMTP plugin. Integrates seamlessly with AWS SDK for PHP to send emails through Amazon SES infrastructure.",
-  "changelog": "<h3>2.1.3 - 2026-06-09</h3><ul><li><strong>Fixed:</strong> Nonce handling in manual quota refresh to correctly handle false values from filter_input()</li><li><strong>Fixed:</strong> Admin notices display now skips non-array notice entries</li><li><strong>Fixed:</strong> Input normalization for recipients, attachments, and headers now properly skips non-string values</li><li><strong>Removed:</strong> Unused internal rate limit method (dead code cleanup)</li><li><strong>Compatibility:</strong> Tested up to WordPress 7.1</li></ul><h3>2.1.2 - 2026-02-12</h3><ul><li><strong>Fixed:</strong> Charset encoding issue that caused \"expected parameter value, got null\" error when sending emails through Amazon SES</li><li><strong>Improved:</strong> Added robust charset validation in header parsing to prevent empty or invalid charset values</li><li><strong>Improved:</strong> Enhanced charset handling with automatic fallback to UTF-8 when no valid charset is provided</li></ul><h3>2.1.1 - 2026-02-09</h3><ul><li><strong>Added:</strong> Comprehensive Amazon SES debug context to test email error reports</li><li><strong>Added:</strong> Debug information now includes AWS region, masked access key, SDK version, endpoint URL, and UTC timestamp</li><li><strong>Improved:</strong> Enhanced AWS error reporting with request IDs, HTTP status codes, and error codes for easier troubleshooting</li><li><strong>Security:</strong> Access keys are now masked in error output (shows only first 4 and last 4 characters)</li></ul>",
+  "changelog": "<h3>2.1.4 - 2026-06-09</h3><ul><li><strong>Changed:</strong> Minimum WordPress version lowered to 5.7 (verified real minimum by static analysis)</li></ul><h3>2.1.3 - 2026-06-09</h3><ul><li><strong>Fixed:</strong> Nonce handling in manual quota refresh to correctly handle false values from filter_input()</li><li><strong>Fixed:</strong> Admin notices display now skips non-array notice entries</li><li><strong>Fixed:</strong> Input normalization for recipients, attachments, and headers now properly skips non-string values</li><li><strong>Removed:</strong> Unused internal rate limit method (dead code cleanup)</li><li><strong>Compatibility:</strong> Tested up to WordPress 7.1</li></ul><h3>2.1.2 - 2026-02-12</h3><ul><li><strong>Fixed:</strong> Charset encoding issue that caused \"expected parameter value, got null\" error when sending emails through Amazon SES</li><li><strong>Improved:</strong> Added robust charset validation in header parsing to prevent empty or invalid charset values</li><li><strong>Improved:</strong> Enhanced charset handling with automatic fallback to UTF-8 when no valid charset is provided</li></ul>",
   "sections": {
     "description": "Adds Amazon SES (Simple Email Service) configuration support to the ROBOTSTXT SMTP plugin. Integrates seamlessly with AWS SDK for PHP to send emails through Amazon SES infrastructure.",
-    "changelog": "<h3>2.1.3 - 2026-06-09</h3><ul><li><strong>Fixed:</strong> Nonce handling in manual quota refresh to correctly handle false values from filter_input()</li><li><strong>Fixed:</strong> Admin notices display now skips non-array notice entries</li><li><strong>Fixed:</strong> Input normalization for recipients, attachments, and headers now properly skips non-string values</li><li><strong>Removed:</strong> Unused internal rate limit method (dead code cleanup)</li><li><strong>Compatibility:</strong> Tested up to WordPress 7.1</li></ul><h3>2.1.2 - 2026-02-12</h3><ul><li><strong>Fixed:</strong> Charset encoding issue that caused \"expected parameter value, got null\" error when sending emails through Amazon SES</li><li><strong>Improved:</strong> Added robust charset validation in header parsing to prevent empty or invalid charset values</li><li><strong>Improved:</strong> Enhanced charset handling with automatic fallback to UTF-8 when no valid charset is provided</li></ul><h3>2.1.1 - 2026-02-09</h3><ul><li><strong>Added:</strong> Comprehensive Amazon SES debug context to test email error reports</li><li><strong>Added:</strong> Debug information now includes AWS region, masked access key, SDK version, endpoint URL, and UTC timestamp</li><li><strong>Improved:</strong> Enhanced AWS error reporting with request IDs, HTTP status codes, and error codes for easier troubleshooting</li><li><strong>Security:</strong> Access keys are now masked in error output (shows only first 4 and last 4 characters)</li></ul><h3>2.1.0 - 2026-02-09</h3><ul><li><strong>Changed:</strong> Uninstall behavior: plugin no longer performs cleanup on uninstall, all data cleanup is now handled by the core SMTP plugin</li></ul>"
+    "changelog": "<h3>2.1.4 - 2026-06-09</h3><ul><li><strong>Changed:</strong> Minimum WordPress version lowered to 5.7 (verified real minimum by static analysis)</li></ul><h3>2.1.3 - 2026-06-09</h3><ul><li><strong>Fixed:</strong> Nonce handling in manual quota refresh to correctly handle false values from filter_input()</li><li><strong>Fixed:</strong> Admin notices display now skips non-array notice entries</li><li><strong>Fixed:</strong> Input normalization for recipients, attachments, and headers now properly skips non-string values</li><li><strong>Removed:</strong> Unused internal rate limit method (dead code cleanup)</li><li><strong>Compatibility:</strong> Tested up to WordPress 7.1</li></ul><h3>2.1.2 - 2026-02-12</h3><ul><li><strong>Fixed:</strong> Charset encoding issue that caused \"expected parameter value, got null\" error when sending emails through Amazon SES</li><li><strong>Improved:</strong> Added robust charset validation in header parsing to prevent empty or invalid charset values</li><li><strong>Improved:</strong> Enhanced charset handling with automatic fallback to UTF-8 when no valid charset is provided</li></ul><h3>2.1.1 - 2026-02-09</h3><ul><li><strong>Added:</strong> Comprehensive Amazon SES debug context to test email error reports</li><li><strong>Security:</strong> Access keys are now masked in error output (shows only first 4 and last 4 characters)</li></ul><h3>2.1.0 - 2026-02-09</h3><ul><li><strong>Changed:</strong> Uninstall behavior: plugin no longer performs cleanup on uninstall, all data cleanup is now handled by the core SMTP plugin</li></ul>"
   },
   "banners": {
     "low": "",
diff --git a/vendor/composer/installed.php b/vendor/composer/installed.php
index 75da4ba..b054fb6 100644
--- a/vendor/composer/installed.php
+++ b/vendor/composer/installed.php
@@ -3,7 +3,7 @@
         'name' => 'robotstxt/robotstxt-smtp-amazonses',
         'pretty_version' => 'dev-main',
         'version' => 'dev-main',
-        'reference' => '5ee811d2c7869bc9871a19d15a52dee43d5eb103',
+        'reference' => 'b0fb27912c6bcd89eea786badab9921b36b41a91',
         'type' => 'wordpress-plugin',
         'install_path' => __DIR__ . '/../../',
         'aliases' => array(),
@@ -121,7 +121,7 @@
         'robotstxt/robotstxt-smtp-amazonses' => array(
             'pretty_version' => 'dev-main',
             'version' => 'dev-main',
-            'reference' => '5ee811d2c7869bc9871a19d15a52dee43d5eb103',
+            'reference' => 'b0fb27912c6bcd89eea786badab9921b36b41a91',
             'type' => 'wordpress-plugin',
             'install_path' => __DIR__ . '/../../',
             'aliases' => array(),