diff --git a/README.md b/README.md
index 301df07..dfdfc01 100755
--- a/README.md
+++ b/README.md
@@ -58,6 +58,9 @@ This plugin detects HTML by checking the headers sent by other WordPress plugins
 [Can I use the Postmark for WordPress plugin with Divi contact forms?](https://postmarkapp.com/support/article/1128-can-i-use-the-postmark-for-wordpress-plugin-with-divi-contact-forms)
 
 ## Changelog
+### v1.12.4
+* Fixes potential collation mismatch errors from date comparisons during old sending logs deletion.
+
 ### v1.12.3
 * Uses count() for check of logs query result count.
 
diff --git a/postmark.php b/postmark.php
index 0de9645..43b0d87 100644
--- a/postmark.php
+++ b/postmark.php
@@ -3,7 +3,7 @@
  * Plugin Name: Postmark (Official)
  * Plugin URI: https://postmarkapp.com/
  * Description: Overrides wp_mail to send emails through Postmark
- * Version: 1.12.3
+ * Version: 1.12.4
  * Author: Andrew Yates & Matt Gibbs
  */
 
@@ -31,7 +31,7 @@ class Postmark_Mail {
 	 */
 	public function __construct() {
 		if ( ! defined( 'POSTMARK_VERSION' ) ) {
-			define( 'POSTMARK_VERSION', '1.12.3' );
+			define( 'POSTMARK_VERSION', '1.12.4' );
 		}
 
 		if ( ! defined( 'POSTMARK_DIR' ) ) {
@@ -374,7 +374,7 @@ function pm_clear_old_logs() {
 		$wpdb->prepare(
 			"SELECT COUNT(*)
 			 FROM $table_name
-             WHERE %s < DATE_SUB(NOW(), INTERVAL %d DAY)
+             WHERE BINARY(%s) < BINARY(DATE_SUB(NOW(), INTERVAL %d DAY))
 			 LIMIT 500",
 			'log_entry_date',
 			7
@@ -387,7 +387,7 @@ function pm_clear_old_logs() {
 		$wpdb->query(
 			$wpdb->prepare(
 				"DELETE FROM $table_name
-            	 WHERE %s < DATE_SUB(NOW(), INTERVAL %d DAY)
+            	 WHERE BINARY(%s) < BINARY(DATE_SUB(NOW(), INTERVAL %d DAY))
 				 LIMIT %d",
 				'log_entry_date',
 				7,
diff --git a/readme.txt b/readme.txt
index c9ea9b5..48edd0c 100644
--- a/readme.txt
+++ b/readme.txt
@@ -90,13 +90,16 @@ And save the changes to the file.
 1. Postmark WP Plugin Settings screen.
 
 == Changelog ==
-= v 1.12.3 =
+= v1.12.4 =
+* Fixes potential collation mismatch errors from date comparisons during old sending logs deletion.
+
+= v1.12.3 =
 * Uses count() for check of logs query result count.
 
-= v 1.12.2 =
+= v1.12.2 =
 * Corrects SQL for deletion of log entries older than 7 days.
 
-= v 1.12.1 =
+= v1.12.1 =
 * Checks if stream_name is set in settings before determining which stream to use.
 
 = v1.12 =