diff --git a/ansible/roles/gitlab_runner/files/config.toml b/ansible/roles/gitlab_runner/files/config.toml
index 4c53989..fc1aec4 100644
--- a/ansible/roles/gitlab_runner/files/config.toml
+++ b/ansible/roles/gitlab_runner/files/config.toml
@@ -1,4 +1,4 @@
-concurrent = {{ ansible_processor_nproc }}
+concurrent = {{ ansible_processor_nproc // 2 }}
 log_level = "warning"
 check_interval = 10