diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index ca5353af6c99abdc36d36bc399e648e56d542eec..1a1bc202dee174fb8e2d77823dae6cecd1728d79 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,6 +1,6 @@
 # Basic CI for doing testing in python 3.6 with pytest
 
-image: python:3.6
+image: harbor.containers.wurnet.nl/proxy-cache/library/python:3.6
 
 stages:          # List of stages for jobs, and their order of execution
   - build