diff --git a/scripts/moonraker-requirements.txt b/scripts/moonraker-requirements.txt
index 143d040..ba77853 100644
--- a/scripts/moonraker-requirements.txt
+++ b/scripts/moonraker-requirements.txt
@@ -1,5 +1,6 @@
 # Python dependencies for Moonraker
 tornado==6.1.0
+pyserial==3.4
 pyserial-asyncio==0.6
 pillow==9.0.1
 lmdb==1.2.1