diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index b32a166506354b75b643f234c1416739a855e416..f249ae0a9ae645cd4998e01742a7b3ae20f3dbbe 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,4 +1,4 @@
-image: python:3-buster
+image: python:3.9
 
 # Make pip cache the installed dependencies
 variables: