diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index dbe0f395a2c659e30a504d3d8c246e1bbe5f7dae..59ad1eeeba92865f8a9947949ce864d374d0bcd0 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -19,6 +19,7 @@ variables:
 
 # ------------------------------------------------------------------------------
 .parallel_job:
+  image: registry.c4science.ch/scitas-stack/rhel:9.3
   parallel:
     matrix:
       - environment: [helvetios]