diff --git a/admin_manual/configuration_server/caching_configuration.rst b/admin_manual/configuration_server/caching_configuration.rst
index 1b0bd19cd0d..7cd14580c8c 100644
--- a/admin_manual/configuration_server/caching_configuration.rst
+++ b/admin_manual/configuration_server/caching_configuration.rst
@@ -24,7 +24,7 @@ needs. The supported caching backends are:
 
 * `APCu <https://pecl.php.net/package/APCu>`_, APCu 4.0.6 and up required.
    A local cache for systems.
-* `Redis <http://redis.io/>`_, PHP module 2.2.6 and up required.
+* `Redis <http://redis.io/>`_, server 4.0.0 and up required.
    For local and distributed caching, as well as transactional file locking.
 * `Memcached <https://www.memcached.org/>`_
    For distributed caching.