diff --git a/homeassistant/package_constraints.txt b/homeassistant/package_constraints.txt
index 7bc4fe5761a..4a7df44ee5e 100644
--- a/homeassistant/package_constraints.txt
+++ b/homeassistant/package_constraints.txt
@@ -8,7 +8,7 @@ typing>=3,<4
 aiohttp==3.1.3
 async_timeout==2.0.1
 astral==1.6.1
-certifi>=2017.4.17
+certifi>=2018.04.16
 attrs==18.1.0
 
 # Breaks Python 3.6 and is not needed for our supported Python versions
diff --git a/requirements_all.txt b/requirements_all.txt
index 78efe76dce6..6cb1cdefe4b 100644
--- a/requirements_all.txt
+++ b/requirements_all.txt
@@ -9,7 +9,7 @@ typing>=3,<4
 aiohttp==3.1.3
 async_timeout==2.0.1
 astral==1.6.1
-certifi>=2017.4.17
+certifi>=2018.04.16
 attrs==18.1.0
 
 # homeassistant.components.nuimo_controller
diff --git a/setup.py b/setup.py
index 6875230b7ab..2469f32d77e 100755
--- a/setup.py
+++ b/setup.py
@@ -52,7 +52,7 @@ REQUIRES = [
     'aiohttp==3.1.3',
     'async_timeout==2.0.1',
     'astral==1.6.1',
-    'certifi>=2017.4.17',
+    'certifi>=2018.04.16',
     'attrs==18.1.0',
 ]