diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 536b627568de7409daaa2d9997f5e111888d630b..c0644eda3c14929d307c8afc1a94fba65135d267 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -4,6 +4,6 @@ build:
     - docker
   script:
     - pip install --upgrade pip setuptools wheel
-    - pip install cython
+    - pip install cython numpy
     - pip install '.'
     - tox