diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 97c4e7874f7e6c8de9c6353d160629da025ff77c..3340a3672c12f52c650f9be34cdddb52b998c600 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,6 +1,5 @@
-before_script:
-  - python3 --version
 
 build:
+  image: python:3.7
   script:
-    - python3 setup.py build_ext
+    - python3.7 setup.py build_ext