diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 7b27eca..52cb1fa 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,5 +1,5 @@
 ---
-image: s3lph/matemat-ci:20180710-01
+image: s3lph/matemat-ci:20180710-02
 
 stages:
 - test
diff --git a/testing/Dockerfile b/testing/Dockerfile
index 35e0ca2..3bf3604 100644
--- a/testing/Dockerfile
+++ b/testing/Dockerfile
@@ -1,11 +1,6 @@
 
 FROM debian:buster
 
-RUN useradd -d /home/matemat -m matemat
 RUN apt-get update -qy
 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
-USER matemat