diff --git a/homeassistant/package_constraints.txt b/homeassistant/package_constraints.txt
index e0a823da44e..372ff66bffd 100644
--- a/homeassistant/package_constraints.txt
+++ b/homeassistant/package_constraints.txt
@@ -6,7 +6,7 @@ astral==1.10.1
 async_timeout==3.0.1
 attrs==19.3.0
 bcrypt==3.1.7
-certifi>=2019.9.11
+certifi>=2019.11.28
 contextvars==2.4;python_version<"3.7"
 cryptography==2.8
 defusedxml==0.6.0
diff --git a/requirements_all.txt b/requirements_all.txt
index a9ac029884d..f7e608cc1fd 100644
--- a/requirements_all.txt
+++ b/requirements_all.txt
@@ -4,7 +4,7 @@ astral==1.10.1
 async_timeout==3.0.1
 attrs==19.3.0
 bcrypt==3.1.7
-certifi>=2019.9.11
+certifi>=2019.11.28
 contextvars==2.4;python_version<"3.7"
 importlib-metadata==0.23
 jinja2>=2.10.3
diff --git a/setup.py b/setup.py
index 99195ee2f56..c153ad1f763 100755
--- a/setup.py
+++ b/setup.py
@@ -36,7 +36,7 @@ REQUIRES = [
     "async_timeout==3.0.1",
     "attrs==19.3.0",
     "bcrypt==3.1.7",
-    "certifi>=2019.9.11",
+    "certifi>=2019.11.28",
     'contextvars==2.4;python_version<"3.7"',
     "importlib-metadata==0.23",
     "jinja2>=2.10.3",