diff --git a/homeassistant/components/zeroconf.py b/homeassistant/components/zeroconf.py
index 675c3a65e5f..1f20ebad086 100644
--- a/homeassistant/components/zeroconf.py
+++ b/homeassistant/components/zeroconf.py
@@ -12,7 +12,7 @@ import voluptuous as vol
 from homeassistant import util
 from homeassistant.const import (EVENT_HOMEASSISTANT_STOP, __version__)
 
-REQUIREMENTS = ['zeroconf==0.20.0']
+REQUIREMENTS = ['zeroconf==0.21.0']
 
 _LOGGER = logging.getLogger(__name__)
 
diff --git a/requirements_all.txt b/requirements_all.txt
index 74f5e2605e6..2d0d784e6dd 100644
--- a/requirements_all.txt
+++ b/requirements_all.txt
@@ -1531,7 +1531,7 @@ youtube_dl==2018.09.10
 zengge==0.2
 
 # homeassistant.components.zeroconf
-zeroconf==0.20.0
+zeroconf==0.21.0
 
 # homeassistant.components.climate.zhong_hong
 zhong_hong_hvac==1.0.9