diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 866791c..0cd937d 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -4,6 +4,7 @@ stages:
 
 buiild job:
   stage: build
+  image: debian:jessie
   script:
     - export PYTHONPATH=.
     - export FLASK_APP=period