diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index dc6c5d663cf1fd37d550e388415b225efbc14e8d..bdb2c7f4206e55a535eaf638272f2feca4d33bf8 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,6 +1,6 @@
 # Official language image. Look for the different tagged releases at:
 # https://hub.docker.com/r/library/python/tags/
-image: ${CI_DEPENDENCY_PROXY_DIRECT_GROUP_IMAGE_PREFIX}/python:3.7
+image: ${CI_DEPENDENCY_PROXY_DIRECT_GROUP_IMAGE_PREFIX}/python:3.6
 
 # Change pip's cache directory to be inside the project directory since we can
 # only cache local items.