diff --git a/pkgs/development/python-modules/nbmerge/default.nix b/pkgs/by-name/nb/nbmerge/package.nix
similarity index 65%
rename from pkgs/development/python-modules/nbmerge/default.nix
rename to pkgs/by-name/nb/nbmerge/package.nix
index 5b825fa91a513ae..b6dc642c9687875 100644
--- a/pkgs/development/python-modules/nbmerge/default.nix
+++ b/pkgs/by-name/nb/nbmerge/package.nix
@@ -1,38 +1,32 @@
 {
   lib,
-  buildPythonPackage,
   fetchFromGitHub,
-  setuptools,
-  nbformat,
-  nose,
+  python3Packages,
 }:
 
-buildPythonPackage rec {
+python3Packages.buildPythonApplication rec {
   pname = "nbmerge";
   version = "0.0.4";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "jbn";
-    repo = pname;
+    repo = "nbmerge";
     rev = "refs/tags/v${version}";
     hash = "sha256-Uqs/SO/AculHCFYcbjW08kLQX5GSU/eAwkN2iy/vhLM=";
   };
 
-  nativeBuildInputs = [ setuptools ];
+  patches = [ ./pytest-compatibility.patch ];
 
-  propagatedBuildInputs = [ nbformat ];
+  build-system = [ python3Packages.setuptools ];
 
-  nativeCheckInputs = [ nose ];
+  dependencies = [ python3Packages.nbformat ];
 
-  checkPhase = ''
-    runHook preCheck
+  nativeCheckInputs = [ python3Packages.pytestCheckHook ];
 
+  postCheck = ''
     patchShebangs .
-    nosetests -v
     PATH=$PATH:$out/bin ./cli_tests.sh
-
-    runHook postCheck
   '';
 
   pythonImportsCheck = [ "nbmerge" ];
diff --git a/pkgs/by-name/nb/nbmerge/pytest-compatibility.patch b/pkgs/by-name/nb/nbmerge/pytest-compatibility.patch
new file mode 100644
index 000000000000000..81ea4c4218f83e0
--- /dev/null
+++ b/pkgs/by-name/nb/nbmerge/pytest-compatibility.patch
@@ -0,0 +1,19 @@
+diff --git a/tests/test_merge.py b/tests/test_merge.py
+index 06ee559..9d7b1af 100644
+--- a/tests/test_merge.py
++++ b/tests/test_merge.py
+@@ -1,3 +1,4 @@
++import io
+ import os
+ import sys
+ import unittest
+@@ -21,8 +22,7 @@ def file_names_from(file_paths):
+ 
+ class TestMerge(unittest.TestCase):
+     def setUp(self):
+-        if not hasattr(sys.stdout, "getvalue"):
+-            self.fail("need to run in buffered mode")
++        sys.stdout = io.StringIO()
+ 
+     def _validate_merged_three(self, merged):
+         self.assertEqual(len(merged.cells), 6)
diff --git a/pkgs/top-level/python-aliases.nix b/pkgs/top-level/python-aliases.nix
index 748d4fa6af18b2c..4b887b0e4249203 100644
--- a/pkgs/top-level/python-aliases.nix
+++ b/pkgs/top-level/python-aliases.nix
@@ -314,6 +314,7 @@ mapAliases ({
   mrkd = throw "mrkd has been promoted to a top-level attribute name: `pkgs.mrkd`"; # added 2023-08-01
   multi_key_dict = multi-key-dict; # added 2023-11-05
   mutmut = throw "mutmut has been promoted to a top-level attribute name: `pkgs.mutmut`"; # added 2022-10-02
+  nbmerge = throw "nbmerge has moved to pkgs.nbmerge"; # added 2024-07-05
   net2grid = gridnet; # add 2022-04-22
   nghttp2 = throw "in 1.52.0 removed deprecated python bindings."; # added 2023-06-08
   ninja-python = ninja; # add 2022-08-03
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index e3e6066cf77d193..960a53e4f1e06ec 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -8835,8 +8835,6 @@ self: super: with self; {
 
   nbmake = callPackage ../development/python-modules/nbmake { };
 
-  nbmerge = callPackage ../development/python-modules/nbmerge { };
-
   nbsmoke = callPackage ../development/python-modules/nbsmoke { };
 
   nbsphinx = callPackage ../development/python-modules/nbsphinx { };