diff --git a/scripts/git_sort/tests/sle15/Dockerfile b/scripts/git_sort/tests/sle15/Dockerfile
index 3fd5bf4..bdd0f25 100644
--- a/scripts/git_sort/tests/sle15/Dockerfile
+++ b/scripts/git_sort/tests/sle15/Dockerfile
@@ -1,5 +1,5 @@
 # http://registry.suse.de/
-FROM registry.suse.de/suse/containers/sle-server/15/containers/bci/python:3.9 AS base
+FROM registry.suse.de/suse/containers/sle-server/15/containers/bci/python:3.6 AS base
 
 RUN rpm -e container-suseconnect
 RUN zypper -n ar -G http://download.suse.de/ibs/SUSE:/SLE-15:/GA/standard/SUSE:SLE-15:GA.repo