diff --git a/pi/assets/img/idle.png b/pi/assets/img/idle.png
index f853294..aa4f85e 100644
Binary files a/pi/assets/img/idle.png and b/pi/assets/img/idle.png differ
diff --git a/pi/assets/img/on_alarm.png b/pi/assets/img/on_alarm.png
index a7512fc..de8d7bc 100644
Binary files a/pi/assets/img/on_alarm.png and b/pi/assets/img/on_alarm.png differ
diff --git a/pi/image_handler.py b/pi/image_handler.py
index 3faccb5..3c6bb24 100644
--- a/pi/image_handler.py
+++ b/pi/image_handler.py
@@ -10,7 +10,7 @@ log = logging.getLogger(__name__)
 
 IMG_DIR = Path(__file__).parent / "assets" / "img"
 STATUS_IMG_SIZE = 120
-MONOCHROME_THRESHOLD = 120
+MONOCHROME_THRESHOLD = 140
 
 
 def load_status_image(path: Path) -> bytes:
@@ -37,7 +37,7 @@ def load_status_image(path: Path) -> bytes:
     y_off = (STATUS_IMG_SIZE - img.height) // 2
     canvas.paste(img, (x_off, y_off))
 
-    # Threshold to 1-bit: black (< 128) -> 1, white -> 0
+    # Threshold to 1-bit: black (< MONOCHROME_THRESHOLD) -> 1, white -> 0
     bw = canvas.point(lambda p: 1 if p < MONOCHROME_THRESHOLD else 0, "1")
     raw = bw.tobytes()
     log.info("Status image loaded: %s -> %d bytes", path.name, len(raw))