diff --git a/web_requirements.txt b/web_requirements.txt
index 3241f13..1f0074a 100644
--- a/web_requirements.txt
+++ b/web_requirements.txt
@@ -22,5 +22,8 @@ python-xlib>=0.33; sys_platform == "linux"
 # Performance monitoring (optional but recommended)
 psutil>=5.9.0
 
+# ESP32 Bluetooth Relay Integration
+pyserial>=3.5
+
 # Additional dependencies for enhanced functionality
 pathlib2>=2.3.7; python_version < "3.4"