diff --git a/pkgs/development/python-modules/cftime/default.nix b/pkgs/development/python-modules/cftime/default.nix
index 443a7e8c1da6..ef33cb69e1ce 100644
--- a/pkgs/development/python-modules/cftime/default.nix
+++ b/pkgs/development/python-modules/cftime/default.nix
@@ -10,14 +10,14 @@
 
 buildPythonPackage rec {
   pname = "cftime";
-  version = "1.6.4";
+  version = "1.6.4.post1";
   format = "setuptools";
 
   disabled = pythonOlder "3.7";
 
   src = fetchPypi {
     inherit pname version;
-    hash = "sha256-4yVAYZN1in7WcwjetS5yd4KhnjhOGDN45/9iCYvgrtw=";
+    hash = "sha256-UKx2zJ8Qq3vUbkSnHFGmknBRtJm0QH308pqxPXQblC8=";
   };
 
   postPatch = ''