diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index fd6be66..85152e5 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -18,7 +18,7 @@ before_script:
   - source environment
   - docker pull "$CI_REGISTRY_IMAGE" || true
   - |
-      docker build --cache-from "$CI_REGISTRY_IMAGE" --pull
+      docker build --ulimit nofile=9000 --cache-from "$CI_REGISTRY_IMAGE" --pull
       --build-arg "BASE=$BASE"
       --build-arg "LDAP_PLUGIN_URL=$LDAP_PLUGIN_URL"
       --build-arg login_text="${LOGIN_TEXT}"