diff --git a/requirements.txt b/requirements.txt
index 4700c99..17e8490 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 appdirs>=1.4
-pyserial>=3.4
+pyserial>=3.5
 colorama>=0.3
 PyYAML>=5.1
 schema>=0.6.8