diff --git a/pkgs/development/python-modules/certifi/default.nix b/pkgs/development/python-modules/certifi/default.nix
index 40e74328572..7ffc50ea520 100644
--- a/pkgs/development/python-modules/certifi/default.nix
+++ b/pkgs/development/python-modules/certifi/default.nix
@@ -5,11 +5,11 @@
 
 buildPythonPackage rec {
   pname = "certifi";
-  version = "2019.9.11";
+  version = "2019.11.28";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "0l0yw94ypd117bl7f0fx8sqw9wsnrpcsn92vr7nkxy54zq665wz4";
+    sha256 = "25b64c7da4cd7479594d035c08c2d809eb4aab3a26e5a990ea98cc450c320f1f";
   };
 
   meta = {