diff --git a/hosts/stonehenge/gitlab-runner.nix b/hosts/stonehenge/gitlab-runner.nix
index 65498fc..580c61e 100644
--- a/hosts/stonehenge/gitlab-runner.nix
+++ b/hosts/stonehenge/gitlab-runner.nix
@@ -11,7 +11,7 @@ in
   virtualisation.docker.enable = true;
   services.gitlab-runner = {
     enable = true;
-    settings.concurrent = 4;
+    settings.concurrent = 2;
     services = {
       wopus-gitlab-nix = mkNixRunnerFull {
         authenticationTokenConfigFile = config.sops.secrets."gitlab-runners/wopus-gitlab-nix".path;
diff --git a/system/monolith-gitlab-runner.nix b/system/monolith-gitlab-runner.nix
index 44de030..e70fd8c 100644
--- a/system/monolith-gitlab-runner.nix
+++ b/system/monolith-gitlab-runner.nix
@@ -12,7 +12,7 @@ in
   virtualisation.docker.enable = true;
   services.gitlab-runner = {
     enable = true;
-    settings.concurrent = 6;
+    settings.concurrent = 3;
     services = {
       # runner for building in docker via host's nix-daemon
       # nix store will be readable in runner, might be insecure