diff --git a/include/led_stub.h b/include/led_stub.h
index 3c543fc..4fe4a8b 100644
--- a/include/led_stub.h
+++ b/include/led_stub.h
@@ -38,8 +38,6 @@ private:
     uint8_t saved_r = 0, saved_g = 0, saved_b = 0;
     uint8_t sysex_saved_r[10] = {0}, sysex_saved_g[10] = {0}, sysex_saved_b[10] = {0};
     bool sysex_flash_active = false;
-    uint32_t heartbeat_time = 0;
-    uint8_t heartbeat_phase = 0;
     
 public:
     DefaultLedStub();
diff --git a/src/led_stub.cpp b/src/led_stub.cpp
index 1acbfb2..255d934 100644
--- a/src/led_stub.cpp
+++ b/src/led_stub.cpp
@@ -328,18 +328,5 @@ void DefaultLedStub::update() {
         activity_off_time = 0;
     }
 
-    // Heartbeat: pulse LED 9 slowly (amber)
-    if (now - heartbeat_time > 2000 && !activity_off_time) {
-        heartbeat_time = now;
-        heartbeat_phase = 1;
-    }
-    if (heartbeat_phase && !activity_off_time) {
-        uint8_t brightness = (heartbeat_phase < 100) ? (heartbeat_phase * 2) : (400 - heartbeat_phase * 2);
-        if (!led_states[9].active) {
-            mux_ptr->set_led_color(9, brightness, brightness / 4, 0);
-            mux_ptr->show();
-        }
-        heartbeat_phase++;
-        if (heartbeat_phase > 200) heartbeat_phase = 0;
-    }
+
 }