diff --git a/pom.xml b/pom.xml
index 70b58267..5cf8d58e 100644
--- a/pom.xml
+++ b/pom.xml
@@ -354,7 +354,7 @@
     <ldap.dir>${project.basedir}/src/ldap</ldap.dir>
     <ldap.generated.dir>${ldap.dir}/generated</ldap.generated.dir>
     <ldap.config.dir>${ldap.dir}/config</ldap.config.dir>
-    <mailbox.version>4.27.3</mailbox.version>
+    <mailbox.version>4.28.14</mailbox.version>
     <sonar.version>5.6.0.6792</sonar.version>
   </properties>
 </project>