diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index f60de1f5..8758cabe 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -11,7 +11,7 @@ stages:
     - python3 -m venv .venv        # NB this does not overwrite an existing cached venv
     - source .venv/bin/activate 
     - pip install pipenv           # Should be cached after first run
-    - pipenv install --dev         # Should be cached after first run - will just check packages are present
+    - pipenv install --dev --deploy        # Should be cached after first run - will just check packages are present
   cache:
     key: "${CI_COMMIT_REF_SLUG}"
     paths: