diff --git a/dockers/php-fpm/Dockerfile b/dockers/php-fpm/Dockerfile
index ed33dd43..bf6ce0b6 100644
--- a/dockers/php-fpm/Dockerfile
+++ b/dockers/php-fpm/Dockerfile
@@ -35,11 +35,14 @@ ENV XDG_DATA_HOME /data
 
 # Install the PHP extensions we need
 RUN docker-php-ext-install -j8 \
+    calendar \
+    intl \
+    luasandbox \
     mysqli \
     opcache \
-    intl \
     sockets \
-    calendar
+    wikidiff2 \
+    ;
 
 # Install the default object cache
 RUN pecl channel-update pecl.php.net