diff --git a/php-fpm/Dockerfile b/php-fpm/Dockerfile
index 6b9eaded..8970b613 100644
--- a/php-fpm/Dockerfile
+++ b/php-fpm/Dockerfile
@@ -39,6 +39,7 @@ RUN set -xe; \
     pecl channel-update pecl.php.net && \
     apt-get install -yqq \
       apt-utils \
+      gnupg2 \
       git \
       #
       #--------------------------------------------------------------------------