diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index b00acb4..4016a5f 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -3,7 +3,7 @@ pypi:
         - cp /keys/.pypirc ~/.pypirc
         - virtualenv /tmp/env
         - source /tmp/env/bin/activate
-        - XDG_CACHE_HOME=/cache pip3 install -U pip wheel setuptools twine build pretix-plugin-build
+        - XDG_CACHE_HOME=/cache pip3 install -U pip wheel setuptools twine build pretix-plugin-build check-manifest
         - python -m build
         - check-manifest .
         - twine check dist/*