diff --git a/crates/arc-api/src/serve.rs b/crates/arc-api/src/serve.rs
index ec9bc18a4..c9b5bf1fd 100644
--- a/crates/arc-api/src/serve.rs
+++ b/crates/arc-api/src/serve.rs
@@ -142,7 +142,7 @@ pub async fn serve_command(args: ServeArgs, styles: &'static Styles) -> anyhow::
     let max_concurrent_runs = args
         .max_concurrent_runs
         .or(server_config.max_concurrent_runs)
-        .unwrap_or(4);
+        .unwrap_or(5);
     let state = create_app_state_with_options(db, factory, dry_run_mode, args.demo, max_concurrent_runs);
     crate::server::spawn_scheduler(Arc::clone(&state));
     let router = build_router(state, auth_mode);
diff --git a/crates/arc-api/src/server.rs b/crates/arc-api/src/server.rs
index 32849b41b..941dabfe1 100644
--- a/crates/arc-api/src/server.rs
+++ b/crates/arc-api/src/server.rs
@@ -293,7 +293,7 @@ pub fn create_app_state(
     db: sqlx::SqlitePool,
     registry_factory: impl Fn(Arc<dyn Interviewer>) -> HandlerRegistry + Send + Sync + 'static,
 ) -> Arc<AppState> {
-    create_app_state_with_options(db, registry_factory, false, false, 4)
+    create_app_state_with_options(db, registry_factory, false, false, 5)
 }
 
 /// Create an `AppState` with the given database pool, registry factory, dry-run flag, and demo flag.