diff --git a/Dockerfile b/Dockerfile
index 5fa6bf3..4267c5b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -17,6 +17,7 @@ RUN \
 	php7-ctype \
 	php7-pdo_sqlite \
 	php7-tokenizer \
+	php7-zip \
 	tar && \
  echo "**** install heimdall ****" && \
  mkdir -p \