diff --git a/pkgs/development/python-modules/pyocd/default.nix b/pkgs/development/python-modules/pyocd/default.nix
index bb10f1881118..65d7342f9edf 100644
--- a/pkgs/development/python-modules/pyocd/default.nix
+++ b/pkgs/development/python-modules/pyocd/default.nix
@@ -1,9 +1,9 @@
 {
   lib,
   buildPythonPackage,
-  fetchPypi,
+  fetchFromGitHub,
   fetchpatch,
-  capstone_4,
+  capstone,
   cmsis-pack-manager,
   colorama,
   importlib-metadata,
@@ -29,13 +29,16 @@ buildPythonPackage rec {
   version = "0.36.0";
   pyproject = true;
 
-  src = fetchPypi {
-    inherit pname version;
-    hash = "sha256-k3eCrMna/wVNUPt8b3iM2UqE+A8LhfJarKuZ3Jgihkg=";
+  src = fetchFromGitHub {
+    owner = "pyocd";
+    repo = "pyOCD";
+    tag = "v${version}";
+    hash = "sha256-CSdVWDiSe+xd0MzD9tsKs3DklNjnhchYFuI3Udi0O20=";
   };
 
   patches = [
     # https://github.com/pyocd/pyOCD/pull/1332
+    # merged into develop
     (fetchpatch {
       name = "libusb-package-optional.patch";
       url = "https://github.com/pyocd/pyOCD/commit/0b980cf253e3714dd2eaf0bddeb7172d14089649.patch";
@@ -43,12 +46,13 @@ buildPythonPackage rec {
     })
   ];
 
+  pythonRelaxDeps = [ "capstone" ];
   pythonRemoveDeps = [ "libusb-package" ];
 
   build-system = [ setuptools-scm ];
 
   dependencies = [
-    capstone_4
+    capstone
     cmsis-pack-manager
     colorama
     importlib-metadata