diff --git a/homeassistant/components/device_tracker/snmp.py b/homeassistant/components/device_tracker/snmp.py
index 46b1686b21d..3efae2b9ce2 100644
--- a/homeassistant/components/device_tracker/snmp.py
+++ b/homeassistant/components/device_tracker/snmp.py
@@ -16,7 +16,7 @@ from homeassistant.const import CONF_HOST
 
 _LOGGER = logging.getLogger(__name__)
 
-REQUIREMENTS = ['pysnmp==4.3.8']
+REQUIREMENTS = ['pysnmp==4.3.9']
 
 CONF_COMMUNITY = 'community'
 CONF_AUTHKEY = 'authkey'
diff --git a/homeassistant/components/sensor/snmp.py b/homeassistant/components/sensor/snmp.py
index 75a6f68a0a2..361ce551426 100644
--- a/homeassistant/components/sensor/snmp.py
+++ b/homeassistant/components/sensor/snmp.py
@@ -15,7 +15,7 @@ from homeassistant.helpers.entity import Entity
 from homeassistant.const import (
     CONF_HOST, CONF_NAME, CONF_PORT, CONF_UNIT_OF_MEASUREMENT)
 
-REQUIREMENTS = ['pysnmp==4.3.8']
+REQUIREMENTS = ['pysnmp==4.3.9']
 
 _LOGGER = logging.getLogger(__name__)
 
diff --git a/requirements_all.txt b/requirements_all.txt
index b6ee7eb5d06..5bce15dbfd2 100644
--- a/requirements_all.txt
+++ b/requirements_all.txt
@@ -684,7 +684,7 @@ pysma==0.1.3
 
 # homeassistant.components.device_tracker.snmp
 # homeassistant.components.sensor.snmp
-pysnmp==4.3.8
+pysnmp==4.3.9
 
 # homeassistant.components.sensor.thinkingcleaner
 # homeassistant.components.switch.thinkingcleaner