diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 002cfa4..7b27eca 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,5 +1,5 @@
 ---
-image: s3lph/matemat-ci:20180619-01
+image: s3lph/matemat-ci:20180710-01
 
 stages:
 - test
diff --git a/testing/Dockerfile b/testing/Dockerfile
index 126a06f..35e0ca2 100644
--- a/testing/Dockerfile
+++ b/testing/Dockerfile
@@ -3,7 +3,8 @@ FROM debian:buster
 
 RUN useradd -d /home/matemat -m matemat
 RUN apt-get update -qy
-RUN apt-get install -y --no-install-recommends python3-dev python3-pip python3-coverage python3-setuptools build-essential
+RUN apt-get install -y --no-install-recommends git docker.io python3-dev python3-pip python3-coverage python3-setuptools build-essential
+RUN usermod -aG docker matemat
 RUN pip3 install wheel pycodestyle mypy
 
 WORKDIR /home/matemat