diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index d73ce22b107243ae195d73e528dfed5d48e113ec..73bcdaf13dec4c0cf8937bfb36afdec54fc4fd7e 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,4 +1,4 @@
-image: "python:3.7"
+image: "painless/tox"
 
 before_script:
   - python --version
@@ -20,6 +20,6 @@ pylint:
   script:
   - pylint -d C0301 setup.py sch/*.py
 
-pytest:
+tox:
   stage: Unit testing
-  script: make test
+  script: tox
diff --git a/tox.ini b/tox.ini
new file mode 100644
index 0000000000000000000000000000000000000000..d4e7a00ddf97da690ad7b577b80189f843d2b062
--- /dev/null
+++ b/tox.ini
@@ -0,0 +1,13 @@
+# tox (https://tox.readthedocs.io/) is a tool for running tests
+# in multiple virtualenvs. This configuration file will run the
+# test suite on all supported python versions. To use it, "pip install tox"
+# and then run "tox" from this directory.
+
+[tox]
+envlist = py35, py36, py37, py38
+
+[testenv]
+deps =
+    pytest
+commands =
+    pytest