diff --git a/src/map/cells.rs b/src/map/cells.rs
index b80a3a8..54d5dc8 100644
--- a/src/map/cells.rs
+++ b/src/map/cells.rs
@@ -17,7 +17,7 @@ pub struct Plugin;
 impl bevy::prelude::Plugin for Plugin {
     fn build(&self, app: &mut App) {
         app.add_systems(
-            Update,
+            FixedUpdate,
             (
                 cells_regeneration.run_if(on_timer(Duration::from_secs(1))),
                 expand.run_if(on_timer(Duration::from_secs(1))),