diff --git a/client/securedrop_client/app.py b/client/securedrop_client/app.py
index ff42f0c1e..43c4ee570 100644
--- a/client/securedrop_client/app.py
+++ b/client/securedrop_client/app.py
@@ -95,7 +95,7 @@ def configure_logging(sdc_home: Path) -> None:
     log_file = os.path.join(sdc_home, "logs", "client.log")
 
     # set logging format
-    log_fmt = "%(asctime)s - %(name)s:%(lineno)d(%(funcName)s) " "%(levelname)s: %(message)s"
+    log_fmt = "%(asctime)s - %(name)s:%(lineno)d(%(funcName)s) %(levelname)s: %(message)s"
     formatter = logging.Formatter(log_fmt)
 
     # define log handlers such as for rotating log files
@@ -149,8 +149,7 @@ def arg_parser() -> ArgumentParser:
         default=DEFAULT_SDC_HOME,
         type=expand_to_absolute,
         help=(
-            f"{SDC_NAME} home directory for storing files and state. "
-            f"(Default {DEFAULT_SDC_HOME})"
+            f"{SDC_NAME} home directory for storing files and state. (Default {DEFAULT_SDC_HOME})"
         ),
     )
     parser.add_argument(
diff --git a/client/securedrop_client/gui/auth/dialog.py b/client/securedrop_client/gui/auth/dialog.py
index 290dc26ef..d7bcaf931 100644
--- a/client/securedrop_client/gui/auth/dialog.py
+++ b/client/securedrop_client/gui/auth/dialog.py
@@ -181,9 +181,7 @@ def validate(self) -> None:
             # Validate username
             if len(username) < self.MIN_JOURNALIST_USERNAME:
                 self.setDisabled(False)
-                self.error(
-                    _("That username won't work.\n" "It should be at least 3 characters long.")
-                )
+                self.error(_("That username won't work.\nIt should be at least 3 characters long."))
                 return
 
             # Validate password
@@ -202,9 +200,7 @@ def validate(self) -> None:
                 int(tfa_token)
             except ValueError:
                 self.setDisabled(False)
-                self.error(
-                    _("That two-factor code won't work.\n" "It should only contain numerals.")
-                )
+                self.error(_("That two-factor code won't work.\nIt should only contain numerals."))
                 return
             self.submit.setText(_("SIGNING IN"))
 
@@ -218,4 +214,4 @@ def validate(self) -> None:
             self.controller.login(username, password, tfa_token)
         else:
             self.setDisabled(False)
-            self.error(_("Please enter a username, passphrase and " "two-factor code."))
+            self.error(_("Please enter a username, passphrase and two-factor code."))
diff --git a/client/securedrop_client/gui/conversation/export/export_wizard_page.py b/client/securedrop_client/gui/conversation/export/export_wizard_page.py
index 4140b79e3..e806d450d 100644
--- a/client/securedrop_client/gui/conversation/export/export_wizard_page.py
+++ b/client/securedrop_client/gui/conversation/export/export_wizard_page.py
@@ -228,9 +228,9 @@ class PreflightPage(ExportWizardPage):
     def __init__(self, export: Export, summary: str) -> None:
         self._should_autoskip_preflight = False
         self.summary = summary
-        header = _(
-            "Preparing to export:<br />" '<span style="font-weight:normal">{}</span>'
-        ).format(summary)
+        header = _('Preparing to export:<br /><span style="font-weight:normal">{}</span>').format(
+            summary
+        )
         body = _(
             "<h2>Understand the risks before exporting files</h2>"
             "<b>Malware</b>"
@@ -285,7 +285,7 @@ def should_autoskip_preflight(self) -> bool:
     def on_status_received(self, status: ExportStatus) -> None:
         self.status = status
         self.stop_animate_header()
-        header = _("Ready to export:<br />" '<span style="font-weight:normal">{}</span>').format(
+        header = _('Ready to export:<br /><span style="font-weight:normal">{}</span>').format(
             self.summary
         )
         self.header.setText(header)
@@ -326,7 +326,7 @@ class InsertUSBPage(ExportWizardPage):
     def __init__(self, export: Export, summary: str) -> None:
         self.no_device_hint = 0
         self.summary = summary
-        header = _("Ready to export:<br />" '<span style="font-weight:normal">{}</span>').format(
+        header = _('Ready to export:<br /><span style="font-weight:normal">{}</span>').format(
             summary
         )
         body = _(
diff --git a/client/securedrop_client/gui/conversation/export/print_dialog.py b/client/securedrop_client/gui/conversation/export/print_dialog.py
index 9387475d6..1b375be97 100644
--- a/client/securedrop_client/gui/conversation/export/print_dialog.py
+++ b/client/securedrop_client/gui/conversation/export/print_dialog.py
@@ -42,10 +42,10 @@ def __init__(self, device: Export, file_name: str, filepaths: list[str]) -> None
 
         # Dialog content
         self.starting_header = _(
-            "Preparing to print:<br />" '<span style="font-weight:normal">{}</span>'
+            'Preparing to print:<br /><span style="font-weight:normal">{}</span>'
         ).format(self.file_name)
         self.ready_header = _(
-            "Ready to print:<br />" '<span style="font-weight:normal">{}</span>'
+            'Ready to print:<br /><span style="font-weight:normal">{}</span>'
         ).format(self.file_name)
         self.insert_usb_header = _("Connect USB printer")
         self.error_header = _("Printing failed")
diff --git a/client/tests/functional/test_export_wizard.py b/client/tests/functional/test_export_wizard.py
index 8d084489c..4c51a3a1b 100644
--- a/client/tests/functional/test_export_wizard.py
+++ b/client/tests/functional/test_export_wizard.py
@@ -97,16 +97,16 @@ def test_export_wizard_device_locked(
         functional_test_logged_in_context, qtbot, mocker, mock_export_locked
     )
 
-    assert isinstance(
-        export_wizard.currentPage(), PreflightPage
-    ), f"Actual: {export_wizard.currentPage()} ({export_wizard.currentId()})"
+    assert isinstance(export_wizard.currentPage(), PreflightPage), (
+        f"Actual: {export_wizard.currentPage()} ({export_wizard.currentId()})"
+    )
 
     assert export_wizard.current_status == ExportStatus.NO_DEVICE_DETECTED
 
     def check_insert_usb_page():
-        assert isinstance(
-            export_wizard.currentPage(), InsertUSBPage
-        ), f"Actual: {export_wizard.currentPage()} ({export_wizard.currentId()})"
+        assert isinstance(export_wizard.currentPage(), InsertUSBPage), (
+            f"Actual: {export_wizard.currentPage()} ({export_wizard.currentId()})"
+        )
 
     # Move to "insert usb" screen
     qtbot.mouseClick(export_wizard.next_button, Qt.LeftButton)
@@ -115,9 +115,9 @@ def check_insert_usb_page():
     assert export_wizard.current_status == ExportStatus.NO_DEVICE_DETECTED
 
     def check_password_page():
-        assert isinstance(
-            export_wizard.currentPage(), PassphraseWizardPage
-        ), f"Actual: {export_wizard.currentPage()} ({export_wizard.currentId()})"
+        assert isinstance(export_wizard.currentPage(), PassphraseWizardPage), (
+            f"Actual: {export_wizard.currentPage()} ({export_wizard.currentId()})"
+        )
 
     # Move to "unlock usb" screen - TODO this is an extra click?
     qtbot.mouseClick(export_wizard.next_button, Qt.LeftButton)
@@ -143,9 +143,9 @@ def check_password_page():
 
     assert export_wizard.current_status == ExportStatus.SUCCESS_EXPORT
 
-    assert isinstance(
-        export_wizard.currentPage(), FinalPage
-    ), f"Actual: {export_wizard.currentPage()} ({export_wizard.currentId()})"
+    assert isinstance(export_wizard.currentPage(), FinalPage), (
+        f"Actual: {export_wizard.currentPage()} ({export_wizard.currentId()})"
+    )
 
 
 @flaky
@@ -164,9 +164,9 @@ def test_export_wizard_device_already_unlocked(
         functional_test_logged_in_context, qtbot, mocker, mock_export_unlocked
     )
 
-    assert isinstance(
-        export_wizard.currentPage(), PreflightPage
-    ), f"Actual: {export_wizard.currentPage()} ({export_wizard.currentId()})"
+    assert isinstance(export_wizard.currentPage(), PreflightPage), (
+        f"Actual: {export_wizard.currentPage()} ({export_wizard.currentId()})"
+    )
 
     assert export_wizard.current_status == ExportStatus.DEVICE_WRITABLE
 
@@ -202,9 +202,9 @@ def test_export_wizard_no_device_then_bad_passphrase(
         mock_export_no_usb_then_bad_passphrase,
     )
 
-    assert isinstance(
-        export_wizard.currentPage(), PreflightPage
-    ), f"Actual: {export_wizard.currentPage()} ({export_wizard.currentId()})"
+    assert isinstance(export_wizard.currentPage(), PreflightPage), (
+        f"Actual: {export_wizard.currentPage()} ({export_wizard.currentId()})"
+    )
 
     assert export_wizard.current_status == ExportStatus.NO_DEVICE_DETECTED
 
@@ -218,9 +218,9 @@ def is_unlock_page():
     assert export_wizard.current_status == ExportStatus.NO_DEVICE_DETECTED
 
     def check_password_page():
-        assert isinstance(
-            export_wizard.currentPage(), PassphraseWizardPage
-        ), f"Actual: {export_wizard.currentPage()} ({export_wizard.currentId()})"
+        assert isinstance(export_wizard.currentPage(), PassphraseWizardPage), (
+            f"Actual: {export_wizard.currentPage()} ({export_wizard.currentId()})"
+        )
 
     # Move to "unlock usb" screen
     qtbot.mouseClick(export_wizard.next_button, Qt.LeftButton)
@@ -243,9 +243,9 @@ def check_password_page_with_error_details():
         After an incorrect password, the 'error details' should be visible
         with a message about incorrect passphrase.
         """
-        assert isinstance(
-            export_wizard.currentPage(), PassphraseWizardPage
-        ), f"Actual: {export_wizard.currentPage()} ({export_wizard.currentId()})"
+        assert isinstance(export_wizard.currentPage(), PassphraseWizardPage), (
+            f"Actual: {export_wizard.currentPage()} ({export_wizard.currentId()})"
+        )
         assert export_wizard.currentPage().error_details.isVisible()
 
     # Click Next - Passphrase error appears
@@ -268,9 +268,9 @@ def check_password_page_with_error_details():
 
     assert export_wizard.current_status == ExportStatus.SUCCESS_EXPORT
 
-    assert isinstance(
-        export_wizard.currentPage(), FinalPage
-    ), f"Actual: {export_wizard.currentPage()} ({export_wizard.currentId()})"
+    assert isinstance(export_wizard.currentPage(), FinalPage), (
+        f"Actual: {export_wizard.currentPage()} ({export_wizard.currentId()})"
+    )
 
 
 @flaky
@@ -290,9 +290,9 @@ def test_export_wizard_error(
         functional_test_logged_in_context, qtbot, mocker, mock_export_fail_early
     )
 
-    assert isinstance(
-        export_wizard.currentPage(), PreflightPage
-    ), f"Actual: {export_wizard.currentPage()} ({export_wizard.currentId()})"
+    assert isinstance(export_wizard.currentPage(), PreflightPage), (
+        f"Actual: {export_wizard.currentPage()} ({export_wizard.currentId()})"
+    )
 
     assert export_wizard.current_status == ExportStatus.NO_DEVICE_DETECTED
 
@@ -306,9 +306,9 @@ def is_unlock_page():
     assert export_wizard.current_status == ExportStatus.NO_DEVICE_DETECTED
 
     def check_password_page():
-        assert isinstance(
-            export_wizard.currentPage(), PassphraseWizardPage
-        ), f"Actual: {export_wizard.currentPage()} ({export_wizard.currentId()})"
+        assert isinstance(export_wizard.currentPage(), PassphraseWizardPage), (
+            f"Actual: {export_wizard.currentPage()} ({export_wizard.currentId()})"
+        )
 
     # Move to "Enter passphrase" screen
     qtbot.mouseClick(export_wizard.next_button, Qt.LeftButton)
@@ -327,7 +327,7 @@ def check_password_page():
     qtbot.wait(TIME_CLICK_ACTION)
     assert export_wizard.current_status == ExportStatus.ERROR_MOUNT
 
-    assert isinstance(
-        export_wizard.currentPage(), ErrorPage
-    ), f"Actual: {export_wizard.currentPage()} ({export_wizard.currentId()})"
+    assert isinstance(export_wizard.currentPage(), ErrorPage), (
+        f"Actual: {export_wizard.currentPage()} ({export_wizard.currentId()})"
+    )
     assert export_wizard.current_status == ExportStatus.ERROR_MOUNT
diff --git a/client/tests/gui/base/test_misc.py b/client/tests/gui/base/test_misc.py
index 452c8a708..2dbea2820 100644
--- a/client/tests/gui/base/test_misc.py
+++ b/client/tests/gui/base/test_misc.py
@@ -122,7 +122,7 @@ def test_SecureQLabel_init_wordwrap(mocker):
     Regression test to make sure we don't remove newlines.
     """
     long_string = (
-        "1234567890123456789012345678901234567890123456789012345678901234567890\n" "12345678901"
+        "1234567890123456789012345678901234567890123456789012345678901234567890\n12345678901"
     )
     sl = SecureQLabel(long_string, wordwrap=False)
     assert sl.text() == long_string
@@ -130,7 +130,7 @@ def test_SecureQLabel_init_wordwrap(mocker):
 
 def test_SecureQLabel_init_no_wordwrap(mocker):
     long_string = (
-        "1234567890123456789012345678901234567890123456789012345678901234567890\n" "12345678901"
+        "1234567890123456789012345678901234567890123456789012345678901234567890\n12345678901"
     )
     sl = SecureQLabel(long_string, wordwrap=False)
     assert sl.text() == long_string
diff --git a/client/tests/gui/conversation/export/test_export_wizard.py b/client/tests/gui/conversation/export/test_export_wizard.py
index 23bdfcc43..37dd272ff 100644
--- a/client/tests/gui/conversation/export/test_export_wizard.py
+++ b/client/tests/gui/conversation/export/test_export_wizard.py
@@ -69,9 +69,9 @@ def test_wizard_exports_directly_to_unlocked_device(self, qtbot):
         self.mock_export.export_state_changed.emit(ExportStatus.DEVICE_WRITABLE)
         self.wizard.next()
 
-        assert isinstance(
-            self.wizard.currentPage(), FinalPage
-        ), f"Actually, f{type(self.wizard.currentPage())}"
+        assert isinstance(self.wizard.currentPage(), FinalPage), (
+            f"Actually, f{type(self.wizard.currentPage())}"
+        )
 
     def test_wizard_rewinds_if_device_removed(self, qtbot):
         self.wizard.show()
diff --git a/client/tests/gui/test_actions.py b/client/tests/gui/test_actions.py
index e9f86809f..d4559d02d 100644
--- a/client/tests/gui/test_actions.py
+++ b/client/tests/gui/test_actions.py
@@ -103,9 +103,9 @@ def test_deletes_source_when_dialog_accepted(self):
         self.action.trigger()
 
         self._controller.delete_sources.assert_called_once()
-        assert (
-            self._source in self._controller.delete_sources.call_args[0][0]
-        ), self._controller.delete_sources.call_args[0][0]
+        assert self._source in self._controller.delete_sources.call_args[0][0], (
+            self._controller.delete_sources.call_args[0][0]
+        )
 
     def test_does_not_delete_source_when_dialog_rejected(self):
         # Reject the confirmation dialog from a separate thread.
diff --git a/client/tests/test_export.py b/client/tests/test_export.py
index 8ff556558..c20273b20 100644
--- a/client/tests/test_export.py
+++ b/client/tests/test_export.py
@@ -78,9 +78,9 @@ def test_Device_run_printer_preflight_checks(self):
             self.device.run_printer_preflight_checks()
 
             mock_qproc.start.assert_called_once()
-            assert (
-                mock_qproc.start.call_args[0] == _QREXEC_EXPORT_COMMAND
-            ), f"Actual: {mock_qproc.start.call_args[0]}"
+            assert mock_qproc.start.call_args[0] == _QREXEC_EXPORT_COMMAND, (
+                f"Actual: {mock_qproc.start.call_args[0]}"
+            )
 
     def test_Device_run_print_preflight_checks_with_error(self):
         spy = QSignalSpy(self.device.print_preflight_check_failed)
diff --git a/client/tests/test_storage.py b/client/tests/test_storage.py
index 1b531b527..4ea7955eb 100644
--- a/client/tests/test_storage.py
+++ b/client/tests/test_storage.py
@@ -2478,7 +2478,7 @@ def test_delete_local_conversation_by_uuid_nosuchuuid(homedir, mocker, session):
 
     delete_local_conversation_by_source_uuid(session, mock_uuid, data_dir)
     error_logger.assert_called_once_with(
-        f"Tried to delete source {mock_uuid}, but UUID " "was not found"
+        f"Tried to delete source {mock_uuid}, but UUID was not found"
     )
 
 
diff --git a/export/securedrop_export/main.py b/export/securedrop_export/main.py
index b730890f4..785767abe 100755
--- a/export/securedrop_export/main.py
+++ b/export/securedrop_export/main.py
@@ -99,7 +99,7 @@ def _configure_logging():
         log_file = os.path.join(DEFAULT_HOME, LOG_DIR_NAME, EXPORT_LOG_FILENAME)
 
         # set logging format
-        log_fmt = "%(asctime)s - %(name)s:%(lineno)d(%(funcName)s) " "%(levelname)s: %(message)s"
+        log_fmt = "%(asctime)s - %(name)s:%(lineno)d(%(funcName)s) %(levelname)s: %(message)s"
         formatter = logging.Formatter(log_fmt)
 
         handler = TimedRotatingFileHandler(log_file)
diff --git a/poetry.lock b/poetry.lock
index 4810a8f7d..098503743 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -876,29 +876,29 @@ files = [
 
 [[package]]
 name = "ruff"
-version = "0.8.4"
+version = "0.9.0"
 description = "An extremely fast Python linter and code formatter, written in Rust."
 optional = false
 python-versions = ">=3.7"
 files = [
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-    {file = "ruff-0.8.4-py3-none-macosx_10_12_x86_64.whl", hash = "sha256:ffb60904651c00a1e0b8df594591770018a0f04587f7deeb3838344fe3adabac"},
-    {file = "ruff-0.8.4-py3-none-macosx_11_0_arm64.whl", hash = "sha256:6ddf5d654ac0d44389f6bf05cee4caeefc3132a64b58ea46738111d687352296"},
-    {file = "ruff-0.8.4-py3-none-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:e248b1f0fa2749edd3350a2a342b67b43a2627434c059a063418e3d375cfe643"},
-    {file = "ruff-0.8.4-py3-none-manylinux_2_17_armv7l.manylinux2014_armv7l.whl", hash = "sha256:bf197b98ed86e417412ee3b6c893f44c8864f816451441483253d5ff22c0e81e"},
-    {file = "ruff-0.8.4-py3-none-manylinux_2_17_i686.manylinux2014_i686.whl", hash = "sha256:c41319b85faa3aadd4d30cb1cffdd9ac6b89704ff79f7664b853785b48eccdf3"},
-    {file = "ruff-0.8.4-py3-none-manylinux_2_17_ppc64.manylinux2014_ppc64.whl", hash = "sha256:9f8402b7c4f96463f135e936d9ab77b65711fcd5d72e5d67597b543bbb43cf3f"},
-    {file = "ruff-0.8.4-py3-none-manylinux_2_17_ppc64le.manylinux2014_ppc64le.whl", hash = "sha256:e4e56b3baa9c23d324ead112a4fdf20db9a3f8f29eeabff1355114dd96014604"},
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-    {file = "ruff-0.8.4-py3-none-musllinux_1_2_aarch64.whl", hash = "sha256:13e9ec6d6b55f6da412d59953d65d66e760d583dd3c1c72bf1f26435b5bfdbae"},
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-    {file = "ruff-0.8.4-py3-none-win32.whl", hash = "sha256:552fb6d861320958ca5e15f28b20a3d071aa83b93caee33a87b471f99a6c0835"},
-    {file = "ruff-0.8.4-py3-none-win_amd64.whl", hash = "sha256:f21a1143776f8656d7f364bd264a9d60f01b7f52243fbe90e7670c0dfe0cf65d"},
-    {file = "ruff-0.8.4-py3-none-win_arm64.whl", hash = "sha256:9183dd615d8df50defa8b1d9a074053891ba39025cf5ae88e8bcb52edcc4bf08"},
-    {file = "ruff-0.8.4.tar.gz", hash = "sha256:0d5f89f254836799af1615798caa5f80b7f935d7a670fad66c5007928e57ace8"},
+    {file = "ruff-0.9.0-py3-none-linux_armv6l.whl", hash = "sha256:949b3513f931741e006cf267bf89611edff04e1f012013424022add3ce78f319"},
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+    {file = "ruff-0.9.0-py3-none-manylinux_2_17_ppc64.manylinux2014_ppc64.whl", hash = "sha256:a11c0872a31232e473e2e0e2107f3d294dbadd2f83fb281c3eb1c22a24866924"},
+    {file = "ruff-0.9.0-py3-none-manylinux_2_17_ppc64le.manylinux2014_ppc64le.whl", hash = "sha256:b5fd06220c17a9cc0dc7fc6552f2ac4db74e8e8bff9c401d160ac59d00566f54"},
+    {file = "ruff-0.9.0-py3-none-manylinux_2_17_s390x.manylinux2014_s390x.whl", hash = "sha256:0457e775c74bf3976243f910805242b7dcd389e1d440deccbd1194ca17a5728c"},
+    {file = "ruff-0.9.0-py3-none-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:05415599bbcb318f730ea1b46a39e4fbf71f6a63fdbfa1dda92efb55f19d7ecf"},
+    {file = "ruff-0.9.0-py3-none-musllinux_1_2_aarch64.whl", hash = "sha256:fbf9864b009e43cfc1c8bed1a6a4c529156913105780af4141ca4342148517f5"},
+    {file = "ruff-0.9.0-py3-none-musllinux_1_2_armv7l.whl", hash = "sha256:37b3da222b12e2bb2ce628e02586ab4846b1ed7f31f42a5a0683b213453b2d49"},
+    {file = "ruff-0.9.0-py3-none-musllinux_1_2_i686.whl", hash = "sha256:733c0fcf2eb0c90055100b4ed1af9c9d87305b901a8feb6a0451fa53ed88199d"},
+    {file = "ruff-0.9.0-py3-none-musllinux_1_2_x86_64.whl", hash = "sha256:8221a454bfe5ccdf8017512fd6bb60e6ec30f9ea252b8a80e5b73619f6c3cefd"},
+    {file = "ruff-0.9.0-py3-none-win32.whl", hash = "sha256:d345f2178afd192c7991ddee59155c58145e12ad81310b509bd2e25c5b0247b3"},
+    {file = "ruff-0.9.0-py3-none-win_amd64.whl", hash = "sha256:0cbc0905d94d21305872f7f8224e30f4bbcd532bc21b2225b2446d8fc7220d19"},
+    {file = "ruff-0.9.0-py3-none-win_arm64.whl", hash = "sha256:7b1148771c6ca88f820d761350a053a5794bc58e0867739ea93eb5e41ad978cd"},
+    {file = "ruff-0.9.0.tar.gz", hash = "sha256:143f68fa5560ecf10fc49878b73cee3eab98b777fcf43b0e62d43d42f5ef9d8b"},
 ]
 
 [[package]]
@@ -1058,4 +1058,4 @@ files = [
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.11"
-content-hash = "53782fe8aa6aa35b40618409c9dcff411af6c71dc7a41e3a3fa08014357d6da6"
+content-hash = "d8ad67f352da27b636bdc28c601a815e3efdd59e37542edaf431c6fdb8ec02ca"
diff --git a/pyproject.toml b/pyproject.toml
index 5dbdfbed0..df7710f38 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -12,7 +12,7 @@ license = "AGPLv3+"
 python = "^3.11"
 
 [tool.poetry.group.dev.dependencies]
-ruff = "^0.8.4"
+ruff = "^0.9.0"
 safety = "*"
 shellcheck-py = "*"
 zizmor = "*"