diff --git a/pkgs/development/python-modules/marionette-harness/mozrunner.nix b/pkgs/development/python-modules/marionette-harness/mozrunner.nix
index b0c3f6d8bcf..368ab51845c 100644
--- a/pkgs/development/python-modules/marionette-harness/mozrunner.nix
+++ b/pkgs/development/python-modules/marionette-harness/mozrunner.nix
@@ -13,12 +13,12 @@
 
 buildPythonPackage rec {
   pname = "mozrunner";
-  version = "6.13";
+  version = "6.14";
   name = "${pname}-${version}";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "1d5k3a0w1iyyk6l28l65j47grq87zd207h369x4vahq02nrx2g6l";
+    sha256 = "a401ea5141cdd15d8f047f19a30ccbeabeb0aea079674b684121acddc5dcf810";
   };
 
   propagatedBuildInputs = [ mozdevice mozfile mozinfo mozlog mozprocess