diff --git a/roles/roundcube/defaults/main.yaml b/roles/roundcube/defaults/main.yaml
index fb30837..4b5b8dd 100644
--- a/roles/roundcube/defaults/main.yaml
+++ b/roles/roundcube/defaults/main.yaml
@@ -77,7 +77,7 @@ roundcube_default_values:
             'ssl' => array(
               'verify_peer'       => false,
               'allow_self_signed' => true,
-              'ciphers' => 'TLSv1.3+HIGH:!aNull:@STRENGTH',
+              'ciphers' => 'TLSv1.2+HIGH:!aNull:@STRENGTH',
             ),
         );
         // For STARTTLS SMTP
@@ -85,7 +85,7 @@ roundcube_default_values:
             'ssl' => array(
               'verify_peer'       => false,
               'allow_self_signed' => true,
-              'ciphers' => 'TLSv1.3+HIGH:!aNull:@STRENGTH',
+              'ciphers' => 'TLSv1.2+HIGH:!aNull:@STRENGTH',
             ),
         );
       ?>