diff --git a/Dockerfile.php b/Dockerfile.php
index 1fb62cb..ee9ef23 100644
--- a/Dockerfile.php
+++ b/Dockerfile.php
@@ -34,6 +34,7 @@
       php${PHP_VERSION}-mysql \
       php${PHP_VERSION}-pgsql \
       php${PHP_VERSION}-redis \
+      php${PHP_VERSION}-soap \
       php${PHP_VERSION}-sqlite3 \
       php${PHP_VERSION}-xdebug \
       php${PHP_VERSION}-xhprof \