diff --git a/Dockerfile b/Dockerfile
index 7e01e00..41ad935 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -30,7 +30,6 @@ RUN set -eux;install-php-extensions intl
 RUN set -eux;install-php-extensions bcmath
 RUN set -eux;install-php-extensions pdo_mysql
 RUN set -eux;install-php-extensions opcache
-RUN set -eux;install-php-extensions memcached
 RUN set -eux;install-php-extensions pcntl
 RUN set -eux;install-php-extensions zip
 
diff --git a/Dockerfile.daemon b/Dockerfile.daemon
index 4aee9a7..d3e5258 100644
--- a/Dockerfile.daemon
+++ b/Dockerfile.daemon
@@ -17,7 +17,6 @@ RUN set -eux;install-php-extensions intl
 RUN set -eux;install-php-extensions bcmath
 RUN set -eux;install-php-extensions pdo_mysql
 RUN set -eux;install-php-extensions opcache
-RUN set -eux;install-php-extensions memcached
 RUN set -eux;install-php-extensions pcntl
 RUN set -eux;install-php-extensions zip
 
diff --git a/Dockerfile.webui b/Dockerfile.webui
index ffd2604..952b385 100644
--- a/Dockerfile.webui
+++ b/Dockerfile.webui
@@ -30,7 +30,6 @@ RUN set -eux;install-php-extensions intl
 RUN set -eux;install-php-extensions bcmath
 RUN set -eux;install-php-extensions pdo_mysql
 RUN set -eux;install-php-extensions opcache
-RUN set -eux;install-php-extensions memcached
 RUN set -eux;install-php-extensions pcntl
 RUN set -eux;install-php-extensions zip