diff --git a/hosts/hainich/services/gitlab-runner.nix b/hosts/hainich/services/gitlab-runner.nix
index a7e081b..51c848d 100644
--- a/hosts/hainich/services/gitlab-runner.nix
+++ b/hosts/hainich/services/gitlab-runner.nix
@@ -12,6 +12,7 @@
         registrationConfigFile = "/etc/gitlab-runner/gitlab-runner.env";
       };
       nix = {
+        limit = 1; # don't run multiple jobs
         registrationConfigFile = "/etc/gitlab-runner/gitlab-runner.env";
         dockerImage = "alpine";
         dockerVolumes = [