diff --git a/pkgs/development/python-modules/amaranth/default.nix b/pkgs/development/python-modules/amaranth/default.nix
index 1a096f01606f..0bf6d2515ef2 100644
--- a/pkgs/development/python-modules/amaranth/default.nix
+++ b/pkgs/development/python-modules/amaranth/default.nix
@@ -4,6 +4,7 @@
   pythonOlder,
   fetchFromGitHub,
   pdm-backend,
+  jschon,
   pyvcd,
   jinja2,
   importlib-resources,
@@ -20,14 +21,14 @@
 buildPythonPackage rec {
   pname = "amaranth";
   format = "pyproject";
-  version = "0.4.5";
+  version = "0.5.0";
   disabled = pythonOlder "3.8";
 
   src = fetchFromGitHub {
     owner = "amaranth-lang";
     repo = "amaranth";
     rev = "refs/tags/v${version}";
-    hash = "sha256-g9dn6gUTdFHz9GMWHERsRLWHoI3E7vjuQDK0usbZO7g=";
+    hash = "sha256-+EV2NgYSuCbYTQKeBUN+/D0attfrJ3cso7U6RjLEIbg=";
   };
 
   nativeBuildInputs = [
@@ -37,6 +38,7 @@ buildPythonPackage rec {
 
   dependencies =
     [
+      jschon
       jinja2
       pyvcd
     ]
diff --git a/pkgs/development/python-modules/fx2/default.nix b/pkgs/development/python-modules/fx2/default.nix
index 52711cead2d0..29809ebdfa5f 100644
--- a/pkgs/development/python-modules/fx2/default.nix
+++ b/pkgs/development/python-modules/fx2/default.nix
@@ -5,6 +5,7 @@
   fetchFromGitHub,
   sdcc,
   libusb1,
+  setuptools-scm,
   crcmod,
 }:
 
@@ -20,7 +21,10 @@ buildPythonPackage rec {
     hash = "sha256-PtWxjT+97+EeNMN36zOT1+ost/w3lRRkaON3Cl3dpp4=";
   };
 
-  nativeBuildInputs = [ sdcc ];
+  nativeBuildInputs = [
+    setuptools-scm
+    sdcc
+  ];
 
   propagatedBuildInputs = [
     libusb1
diff --git a/pkgs/development/python-modules/jschon/default.nix b/pkgs/development/python-modules/jschon/default.nix
new file mode 100644
index 000000000000..8a1686095fbf
--- /dev/null
+++ b/pkgs/development/python-modules/jschon/default.nix
@@ -0,0 +1,75 @@
+{ lib
+, buildPythonPackage
+, fetchFromGitHub
+, setuptools
+, wheel
+, rfc3986
+, pytestCheckHook
+, hypothesis
+, requests
+, pytest-httpserver
+, pytest-xdist
+}:
+
+buildPythonPackage rec {
+  pname = "jschon";
+  version = "0.11.1";
+  pyproject = true;
+
+  src = fetchFromGitHub {
+    owner = "marksparkza";
+    repo = "jschon";
+    rev = "v${version}";
+    hash = "sha256-uOvEIEUEILsoLuV5U9AJCQAlT4iHQhsnSt65gfCiW0k=";
+    fetchSubmodules = true;
+  };
+
+  build-system = [
+    setuptools
+    wheel
+  ];
+
+  dependencies = [
+    rfc3986
+  ];
+
+  pythonImportsCheck = [
+    "jschon"
+    "jschon.catalog"
+    "jschon.vocabulary"
+    "jschon.exc"
+    "jschon.exceptions"
+    "jschon.formats"
+    "jschon.json"
+    "jschon.jsonpatch"
+    "jschon.jsonpointer"
+    "jschon.jsonschema"
+    "jschon.output"
+    "jschon.uri"
+    "jschon.utils"
+  ];
+
+  nativeCheckInputs = [
+    pytestCheckHook
+    hypothesis
+    requests
+    pytest-httpserver
+    #pytest-benchmark # not needed for distribution
+    pytest-xdist # not used upstream, but massive speedup
+  ];
+
+  disabledTestPaths = [
+    "tests/test_benchmarks.py"
+  ];
+
+  # used in checks
+  __darwinAllowLocalNetworking = true;
+
+  meta = with lib; {
+    description = "An object-oriented JSON Schema implementation for Python";
+    homepage = "https://github.com/marksparkza/jschon";
+    changelog = "https://github.com/marksparkza/jschon/blob/${src.rev}/CHANGELOG.rst";
+    license = licenses.mit;
+    maintainers = with maintainers; [ pbsds ];
+  };
+}
diff --git a/pkgs/tools/misc/glasgow/default.nix b/pkgs/tools/misc/glasgow/default.nix
index 4821ad923ef8..373a1d38889e 100644
--- a/pkgs/tools/misc/glasgow/default.nix
+++ b/pkgs/tools/misc/glasgow/default.nix
@@ -5,40 +5,49 @@
 , yosys
 , icestorm
 , nextpnr
+, unstableGitUpdater
 }:
 
 python3.pkgs.buildPythonApplication rec {
   pname = "glasgow";
-  version = "unstable-2023-09-20";
-  # python -m setuptools_scm
-  realVersion = "0.1.dev1798+g${lib.substring 0 7 src.rev}";
+  version = "0-unstable-2024-06-27";
+  # from `pdm show`
+  realVersion = let
+      tag = builtins.elemAt (lib.splitString "-" version) 0;
+      rev = lib.substring 0 7 src.rev;
+    in "${tag}.1.dev2085+g${rev}";
+
+  pyproject = true;
 
   src = fetchFromGitHub {
     owner = "GlasgowEmbedded";
     repo = "glasgow";
-    rev = "e9a9801d5be3dcba0ee188dd8a6e9115e337795d";
-    sha256 = "sha256-ztB3I/jrDSm1gKB1e5igivUVloq+YYhkshDlWg75NMA=";
+    rev = "a599e3caa64c2e445358894fd050e16917f2ee42";
+    sha256 = "sha256-5qg0/j1MgwHMOjySBY5cKuQqlqltV5cXcR/Ap6J9vys=";
   };
 
   nativeBuildInputs = [
-    python3.pkgs.setuptools-scm
+    python3.pkgs.pdm-backend
     sdcc
   ];
 
   propagatedBuildInputs = with python3.pkgs; [
-    aiohttp
+    typing-extensions
     amaranth
-    appdirs
-    bitarray
-    crc
+    packaging
+    platformdirs
     fx2
     libusb1
-    packaging
     pyvcd
-    setuptools
+    aiohttp
   ];
 
-  nativeCheckInputs = [ yosys icestorm nextpnr ];
+  nativeCheckInputs = [
+    python3.pkgs.unittestCheckHook
+    yosys
+    icestorm
+    nextpnr
+  ];
 
   enableParallelBuilding = true;
 
@@ -46,7 +55,7 @@ python3.pkgs.buildPythonApplication rec {
     make -C firmware LIBFX2=${python3.pkgs.fx2}/share/libfx2
     cp firmware/glasgow.ihex software/glasgow
     cd software
-    export SETUPTOOLS_SCM_PRETEND_VERSION="${realVersion}"
+    export PDM_BUILD_SCM_VERSION="${realVersion}"
   '';
 
   # installCheck tries to build_ext again
@@ -54,16 +63,16 @@ python3.pkgs.buildPythonApplication rec {
 
   postInstall = ''
     mkdir -p $out/etc/udev/rules.d
-    cp $src/config/99-glasgow.rules $out/etc/udev/rules.d
+    cp $src/config/*.rules $out/etc/udev/rules.d
   '';
 
-  checkPhase = ''
+  preCheck = ''
+    export PYTHONWARNINGS="ignore::DeprecationWarning"
     # tests attempt to cache bitstreams
     # for linux:
     export XDG_CACHE_HOME=$TMPDIR
     # for darwin:
     export HOME=$TMPDIR
-    ${python3.interpreter} -W ignore::DeprecationWarning test.py
   '';
 
   makeWrapperArgs = [
@@ -72,6 +81,10 @@ python3.pkgs.buildPythonApplication rec {
     "--set" "NEXTPNR_ICE40" "${nextpnr}/bin/nextpnr-ice40"
   ];
 
+  passthru.updateScript = unstableGitUpdater {
+    hardcodeZeroVersion = true;
+  };
+
   meta = with lib; {
     description = "Software for Glasgow, a digital interface multitool";
     homepage = "https://github.com/GlasgowEmbedded/Glasgow";
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 38bbca5f4992..91535cf14e94 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -6210,6 +6210,8 @@ self: super: with self; {
 
   jschema-to-python = callPackage ../development/python-modules/jschema-to-python { };
 
+  jschon = callPackage ../development/python-modules/jschon { };
+
   jsmin = callPackage ../development/python-modules/jsmin { };
 
   json5 = callPackage ../development/python-modules/json5 { };