diff --git a/homeassistant/components/notify/slack.py b/homeassistant/components/notify/slack.py
index 90944cbd308..ea21d2b2afc 100644
--- a/homeassistant/components/notify/slack.py
+++ b/homeassistant/components/notify/slack.py
@@ -14,7 +14,7 @@ from homeassistant.const import (
     CONF_API_KEY, CONF_USERNAME, CONF_ICON)
 import homeassistant.helpers.config_validation as cv
 
-REQUIREMENTS = ['slacker==0.9.30']
+REQUIREMENTS = ['slacker==0.9.40']
 
 _LOGGER = logging.getLogger(__name__)
 
diff --git a/requirements_all.txt b/requirements_all.txt
index ab2c6b036ae..abe9fdf730e 100755
--- a/requirements_all.txt
+++ b/requirements_all.txt
@@ -588,7 +588,7 @@ sense-hat==2.2.0
 sharp_aquos_rc==0.3.2
 
 # homeassistant.components.notify.slack
-slacker==0.9.30
+slacker==0.9.40
 
 # homeassistant.components.notify.xmpp
 sleekxmpp==1.3.1