diff --git a/requirements_all.txt b/requirements_all.txt
index ff8783a54b4..d65e3af8a82 100644
--- a/requirements_all.txt
+++ b/requirements_all.txt
@@ -303,7 +303,7 @@ pynx584==0.2
 pyowm==2.3.2
 
 # homeassistant.components.switch.acer_projector
-pyserial<=3.0
+pyserial<=3.1
 
 # homeassistant.components.device_tracker.snmp
 # homeassistant.components.sensor.snmp