diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 555f03ab6be97eaa9ea4e6520d0faa83b5760bb4..885e6f8ae551a3dbf765226c808731235def3c99 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -44,6 +44,8 @@ Python 3.6 + Barvinok:
   - git clean -fdx
   - python3.6 -m venv .env
   - source .env/bin/activate
+  - python -m ensurepip
+  - pip install cffi
   - "./build-with-barvinok.sh"
   tags:
   - python3.6