diff --git a/Dockerfile b/Dockerfile
index 117328b..bb3a9dc 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,5 @@
 FROM php:7.0-apache
+RUN apt-get update && apt-get install -my gnupg
 RUN curl -sL https://deb.nodesource.com/setup_6.x | bash -
 RUN curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add -
 RUN echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list