diff --git a/homeassistant/package_constraints.txt b/homeassistant/package_constraints.txt
index f6666c829e0..7bc4fe5761a 100644
--- a/homeassistant/package_constraints.txt
+++ b/homeassistant/package_constraints.txt
@@ -1,6 +1,6 @@
 requests==2.18.4
 pyyaml>=3.11,<4
-pytz>=2017.02
+pytz>=2018.04
 pip>=8.0.3
 jinja2>=2.10
 voluptuous==0.11.1
diff --git a/requirements_all.txt b/requirements_all.txt
index aaffe3068c2..6797be02b7f 100644
--- a/requirements_all.txt
+++ b/requirements_all.txt
@@ -1,7 +1,7 @@
 # Home Assistant core
 requests==2.18.4
 pyyaml>=3.11,<4
-pytz>=2017.02
+pytz>=2018.04
 pip>=8.0.3
 jinja2>=2.10
 voluptuous==0.11.1
diff --git a/setup.py b/setup.py
index 8a68617afd9..6875230b7ab 100755
--- a/setup.py
+++ b/setup.py
@@ -44,7 +44,7 @@ PACKAGES = find_packages(exclude=['tests', 'tests.*'])
 REQUIRES = [
     'requests==2.18.4',
     'pyyaml>=3.11,<4',
-    'pytz>=2017.02',
+    'pytz>=2018.04',
     'pip>=8.0.3',
     'jinja2>=2.10',
     'voluptuous==0.11.1',