diff --git a/php-fpm/Dockerfile-56 b/php-fpm/Dockerfile-56
index 5cdb9200..0f7e0661 100644
--- a/php-fpm/Dockerfile-56
+++ b/php-fpm/Dockerfile-56
@@ -101,7 +101,7 @@ RUN if [ ${INSTALL_BCMATH} = true ]; then \
 ARG INSTALL_MEMCACHED=false
 RUN if [ ${INSTALL_MEMCACHED} = true ]; then \
     # Install the php memcached extension
-    pecl install memcached && \
+    pecl install memcached-2.2.0 && \
     docker-php-ext-enable memcached \
 ;fi