diff --git a/bin/sign_windows.py b/bin/sign_windows.py
index 277cbdd..69fecbd 100644
--- a/bin/sign_windows.py
+++ b/bin/sign_windows.py
@@ -28,4 +28,6 @@ for audience in audiences:
             exe_path = os.path.join(basepath, audience, "windows", arch, binary)
             result = signer.sign(exe_path, bitness=arch)
             if not result:
-                raise EnvironmentError("Could not sign executable ! Is the PKI key connected ?")
\ No newline at end of file
+                raise EnvironmentError(
+                    "Could not sign executable ! Is the PKI key connected ?"
+                )
diff --git a/npbackup/core/runner.py b/npbackup/core/runner.py
index 8f84fa1..ff26b87 100644
--- a/npbackup/core/runner.py
+++ b/npbackup/core/runner.py
@@ -80,9 +80,15 @@ def metric_writer(config_dict: dict, restic_result: bool, result_string: str):
                         if additional_label:
                             try:
                                 label, value = additional_label.split("=")
-                                label_string += ',{}="{}"'.format(label.strip(), value.strip())
+                                label_string += ',{}="{}"'.format(
+                                    label.strip(), value.strip()
+                                )
                             except ValueError:
-                                logger.error("Bogus additional label \"{}\" defined in configuration.".format(additional_label))
+                                logger.error(
+                                    'Bogus additional label "{}" defined in configuration.'.format(
+                                        additional_label
+                                    )
+                                )
             except (KeyError, AttributeError, TypeError):
                 logger.error("Bogus additional labels defined in configuration.")
                 logger.debug("Trace:", exc_info=True)
@@ -360,12 +366,15 @@ class NPBackupRunner:
                             key, value = env_variable.split("=")
                             expanded_env_vars[key.strip()] = value.strip()
                         except ValueError:
-                            logger.error("Bogus environment variable \"{}\" defined in configuration.".format(env_variable))
+                            logger.error(
+                                'Bogus environment variable "{}" defined in configuration.'.format(
+                                    env_variable
+                                )
+                            )
         except (KeyError, AttributeError, TypeError):
             logger.error("Bogus environment variables defined in configuration.")
             logger.debug("Trace:", exc_info=True)
 
-
         try:
             self.restic_runner.environment_variables = expanded_env_vars
         except ValueError:
diff --git a/npbackup/gui/config.py b/npbackup/gui/config.py
index f57c96d..5885131 100644
--- a/npbackup/gui/config.py
+++ b/npbackup/gui/config.py
@@ -76,7 +76,7 @@ def config_gui(config_dict: dict, config_file: str):
                             "password_command",
                             "auto_upgrade_server_username",
                             "auto_upgrade_server_password",
-                            "encrypted_variables"
+                            "encrypted_variables",
                         ]:
                             try:
                                 if (
diff --git a/npbackup/restic_metrics/__init__.py b/npbackup/restic_metrics/__init__.py
index d720b8f..ebf8b09 100644
--- a/npbackup/restic_metrics/__init__.py
+++ b/npbackup/restic_metrics/__init__.py
@@ -241,7 +241,12 @@ def upload_metrics(destination, authentication, no_cert_verify, metrics):
             data += "{}\n".format(metric)
         logger.debug("metrics:\n{}".format(data))
         result = requests.post(
-            destination, headers=headers, data=data, auth=authentication, timeout=4, verify=not no_cert_verify
+            destination,
+            headers=headers,
+            data=data,
+            auth=authentication,
+            timeout=4,
+            verify=not no_cert_verify,
         )
         if result.status_code == 200:
             logger.info("Metrics pushed succesfully.")
diff --git a/npbackup/restic_wrapper/__init__.py b/npbackup/restic_wrapper/__init__.py
index 4dcacc2..c4f9731 100644
--- a/npbackup/restic_wrapper/__init__.py
+++ b/npbackup/restic_wrapper/__init__.py
@@ -104,7 +104,7 @@ class ResticRunner:
                 self.repository = None
 
         for env_variable, value in self.environment_variables.items():
-            logger.warning("Setting envrionment variable \"{}\"".format(env_variable))
+            logger.warning('Setting envrionment variable "{}"'.format(env_variable))
             os.environ[env_variable] = value
 
     def _remove_env(self) -> None: