diff --git a/requirements.txt b/requirements.txt
index 2417c77..c52c9d5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 wiringpi>=2.60.0; sys_platform == 'linux'
 pika>=1.2.0
-pyserial>=3.4
+pyserial>=3.5
 python-dateutil>=2.8.0
 setuptools>=45.1.0
 pip