gns3-{gui,server}: 2.2.0 -> 2.2.1

pkgs/applications/networking/gns3/gui.nix

@@ -1,11 +1,20 @@
 { stable, branch, version, sha256Hash }:
 
-{ stdenv, python3Packages, fetchFromGitHub }:
+{ stdenv, python3, fetchFromGitHub }:
 
 let
-  pythonPackages = python3Packages;
-
-in pythonPackages.buildPythonPackage rec {
+  python = python3.override {
+    packageOverrides = self: super: {
+      jsonschema = super.jsonschema.overridePythonAttrs (oldAttrs: rec {
+        version = "2.6.0";
+        src = oldAttrs.src.override {
+          inherit version;
+          sha256 = "00kf3zmpp9ya4sydffpifn0j0mzm342a2vzh82p6r0vh10cg7xbg";
+        };
+      });
+    };
+  };
+in python.pkgs.buildPythonPackage rec {
   name = "${pname}-${version}";
   pname = "gns3-gui";
 
@@ -16,7 +25,7 @@ in pythonPackages.buildPythonPackage rec {
     sha256 = sha256Hash;
   };
 
-  propagatedBuildInputs = with pythonPackages; [
+  propagatedBuildInputs = with python.pkgs; [
     raven psutil jsonschema # tox for check
     # Runtime dependencies
     sip (pyqt5.override { withWebSockets = true; }) distro setuptools