diff --git a/pkgs/development/python-modules/certifi/default.nix b/pkgs/development/python-modules/certifi/default.nix
index 3bc686121cf0..429fd47f72e0 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 = "2018.4.16";
+  version = "2018.8.13";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "13e698f54293db9f89122b0581843a782ad0934a4fe0172d2a980ba77fc61bb7";
+    sha256 = "4c1d68a1408dd090d2f3a869aa94c3947cc1d967821d1ed303208c9f41f0f2f4";
   };
 
   meta = {