diff --git a/tools/docker/Dockerfile b/tools/docker/Dockerfile
index 8806805..6ccb296 100644
--- a/tools/docker/Dockerfile
+++ b/tools/docker/Dockerfile
@@ -22,6 +22,7 @@ RUN apt-get update -yqq && \
   apt-get install -yqq --no-install-recommends \
     libpng-dev \
     mariadb-client \
+    unzip \
     zlib1g-dev \
   && docker-php-ext-install \
     exif \