diff --git a/pkgs/tools/package-management/pdm/default.nix b/pkgs/tools/package-management/pdm/default.nix
index cf8b7d3f74af..e9db7f63fba6 100644
--- a/pkgs/tools/package-management/pdm/default.nix
+++ b/pkgs/tools/package-management/pdm/default.nix
@@ -1,4 +1,4 @@
-{ lib, python3, fetchFromGitHub }:
+{ lib, python3, fetchFromGitHub, fetchurl }:
 let
   python = python3.override {
     # override resolvelib due to
@@ -39,7 +39,14 @@ buildPythonApplication rec {
   #
   # the patch is necessary because the fixture is creating a project and
   # doesn't appear to respect the settings in `$HOME`; possibly a bug upstream
-  patches = [ ./check-update.patch ];
+  patches = [
+    ./check-update.patch
+    (fetchurl {
+      # Mark test that require network access
+      url = "https://github.com/pdm-project/pdm/files/7911962/mark-network-tests.patch.txt";
+      hash = "sha256:1dizf9j3z7zk4lxvnszwx63xzd9r68f2iva5sszzf8s8na831dvd";
+    })
+  ];
 
   propagatedBuildInputs = [
     blinker
@@ -64,121 +71,28 @@ buildPythonApplication rec {
   checkInputs = [
     pytestCheckHook
     pytest-mock
+    pytest-xdist
+  ];
+
+  pytestFlagsArray = [
+    "--numprocesses $NIX_BUILD_CORES"
+    "-m 'not network'"
   ];
 
   preCheck = "HOME=$TMPDIR";
 
   disabledTests = [
-    # these may eventually succeed but are incredibly slow due to contacting
-    # the internet
-    "test_convert_requirements_file_without_name"
-    "test_add_dependency_from_multiple_parents"
-    "test_add_editable_package"
-    "test_add_package"
-    "test_add_package_with_mismatch_marker"
-    "test_add_with_dry_run"
-    "test_add_with_prerelease"
-    "test_build_src_package_by_include"
-    "test_editable_package_override_non_editable"
-    "test_find_candidates_from_find_links"
-    "test_freeze_dependencies_list"
-    "test_info_global_project"
-    "test_install_with_dry_run"
-    "test_install_with_lockfile"
-    "test_list_dependency_graph"
-    "test_list_dependency_graph_with_circular_forward"
-    "test_list_dependency_graph_with_circular_reverse"
-    "test_list_reverse_dependency_graph"
-    "test_load_multiple_plugings"
-    "test_old_entry_point_compatibility"
-    "test_parse_flit_project_metadata"
-    "test_parse_local_directory_metadata"
-    "test_parse_project_file_on_build_error"
-    "test_parse_project_file_on_build_error_no_dep"
-    "test_parse_project_file_on_build_error_with_extras"
-    "test_parse_vcs_metadata"
-    "test_post_lock_and_install_signals"
-    "test_remove_both_normal_and_editable_packages"
-    "test_remove_package"
-    "test_remove_package_exist_in_multi_groups"
-    "test_remove_package_no_sync"
-    "test_remove_package_not_exist"
-    "test_remove_package_with_dry_run"
-    "test_resolve_file_req_with_prerelease"
-    "test_resolve_local_and_named_requirement"
-    "test_resolve_two_extras_from_the_same_package"
-    "test_resolve_vcs_and_local_requirements"
-    "test_sync_clean_packages"
-    "test_sync_dry_run"
-    "test_sync_packages_with_group_all"
-    "test_sync_packages_with_groups"
-    "test_sync_production_packages"
-    "test_update_all_packages"
-    "test_update_dry_run"
-    "test_update_existing_package_with_prerelease"
-    "test_update_ignore_constraints"
-    "test_update_packages_with_top"
-    "test_update_top_packages_dry_run"
-    "test_update_with_package_and_groups_argument"
-    # requires the internet
-    "test_actual_list_freeze"
-    "test_add_cached_vcs_requirement"
-    "test_add_remote_package_url"
-    "test_basic_integration"
-    "test_build_distributions"
-    "test_build_ignoring_pip_environment"
-    "test_build_legacy_package"
-    "test_build_package"
-    "test_build_package_include"
-    "test_build_single_module"
-    "test_build_single_module_with_readme"
-    "test_build_src_package"
-    "test_build_with_config_settings"
-    "test_build_with_no_isolation"
-    "test_cache_egg_info_sdist"
-    "test_cache_vcs_immutable_revision"
-    "test_cli_build_with_config_settings"
-    "test_expand_project_root_in_url"
-    "test_extras_warning"
-    "test_hash_cache"
-    "test_install_wheel_with_cache"
-    "test_install_wheel_with_data_scripts"
-    "test_install_wheel_with_inconsistent_dist_info"
-    "test_install_with_file_existing"
-    "test_parse_abnormal_specifiers"
-    "test_parse_artifact_metadata"
-    "test_parse_metadata_with_extras"
-    "test_parse_remote_link_metadata"
-    "test_pep582_launcher_for_python_interpreter"
-    "test_rollback_after_commit"
-    "test_run_with_another_project_root"
-    "test_search_package"
-    "test_show_update_hint"
-    "test_sync_only_different"
-    "test_sync_with_index_change"
-    "test_uninstall_commit_rollback"
-    "test_uninstall_with_console_scripts"
-    "test_update_with_prerelease_without_package_argument"
-    "test_url_requirement_is_not_cached"
     # sys.executable and expected executable are different
     "test_set_non_exist_python_path"
-    # editable inside nixpkgs doesn't seem to be a thing
-    "test_vcs_candidate_in_subdirectory"
-    # pdm compares with what looks to be an older version of poetry
-    "test_parse_poetry_project_metadata"
     # pythonfinder isn't aware of nix's python infrastructure
     "test_auto_isolate_site_packages"
     "test_use_invalid_wrapper_python"
     "test_use_wrapper_python"
-    # broken but wouldn't succeed anyway because of the network
-    "test_sync_in_sequential_mode"
     # tries to read/write files without proper permissions
     "test_completion_command"
     "test_plugin_add"
     "test_plugin_list"
     "test_plugin_remove"
-    # unknown breakage, but probably hitting the internet
-    "test_show_package_on_pypi"
     # tries to treat a gzip file as a zipfile and fails
     "test_resolve_local_artifacts"
   ];