diff --git a/pkgs/development/python-modules/marionette-harness/mozfile.nix b/pkgs/development/python-modules/marionette-harness/mozfile.nix
index 34350dd4821f..773b0bb8c1e5 100644
--- a/pkgs/development/python-modules/marionette-harness/mozfile.nix
+++ b/pkgs/development/python-modules/marionette-harness/mozfile.nix
@@ -5,11 +5,11 @@
 
 buildPythonPackage rec {
   pname = "mozfile";
-  version = "1.2";
+  version = "2.1.0";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "0mz941np62mg0zncy74d8fbq9fafsxjsxlwdsydl92badhrhzc6k";
+    sha256 = "e5dc835582ea150e35ecd57e9d86cb707d3aa3b2505679db7332326dd49fd6b8";
   };
 
   propagatedBuildInputs = [ ];