diff --git a/setup.py b/setup.py
index 0a9ae65e..3ada2056 100644
--- a/setup.py
+++ b/setup.py
@@ -24,7 +24,7 @@ INSTALL_REQUIRES = [
 	"Flask-Babel>=0.11,<0.12",
 	"Flask-Assets>=0.12,<0.13",
 	"markdown>=2.6.4,<2.7",
-	"pyserial>=2.7,<2.8",
+	"pyserial>=3.1.1,<3.2",
 	"netaddr>=0.7.17,<0.8",
 	"watchdog>=0.8.3,<0.9",
 	"sarge>=0.1.4,<0.2",