diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index b7ed8d4e9f0..209fa3f3a93 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -14066,11 +14066,11 @@ in modules // {
   };
 
   mock = buildPythonPackage (rec {
-    name = "mock-1.3.0";
+    name = "mock-2.0.0";
 
     src = pkgs.fetchurl {
       url = "mirror://pypi/m/mock/${name}.tar.gz";
-      sha256 = "1xm0xkaz8d8d26kdk09f2n9vn543ssd03vmpkqlmgq3crjz7s90y";
+      sha256 = "1flbpksir5sqrvq2z0dp8sl4bzbadg21sj4d42w3klpdfvgvcn5i";
     };
 
     buildInputs = with self; [ unittest2 ];