diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 1b3649805b3f3c1955a69c3e4bc899f3562628ec..3f466d68540a52eb91b1dee544d2a79ee3461be6 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -57,6 +57,7 @@ automated_test:
     OUTPUT: $CI_MERGE_REQUEST_SOURCE_BRANCH_NAME
     DETECTORS: all
     CALIBRATION: all
+    PYENV_VERSION: "3.8"
   stage: automated_test
   only: [merge_requests]
   when: manual