diff --git a/mslib/mscolab/seed.py b/mslib/mscolab/seed.py
index d9bc3ff70..8103ac158 100644
--- a/mslib/mscolab/seed.py
+++ b/mslib/mscolab/seed.py
@@ -88,7 +88,7 @@ def add_all_users_default_operation(path='TEMPLATE', description="Operation to k
             return True
         except IntegrityError as err:
             db.session.rollback()
-            logging.debug(f"Error writing to db: {err}")
+            logging.debug("Error writing to db: %s", err)
         db.session.close()
 
 
@@ -98,7 +98,7 @@ def delete_user(email):
     with app.app_context():
         user = User.query.filter_by(emailid=str(email)).first()
         if user:
-            logging.info(f"User: {email} deleted from db")
+            logging.info("User: %s deleted from db", email)
             db.session.delete(user)
             db.session.commit()
             db.session.close()
@@ -126,11 +126,11 @@ def add_user(email, username, password):
             db.session.add(db_user)
             db.session.commit()
             db.session.close()
-            logging.info(f"Userdata: {email} {username} {password}")
+            logging.info("Userdata: %s %s %s", email, username, password)
             logging.info(template)
             return True
         else:
-            logging.info(f"{user_name_exists} already in db")
+            logging.info("%s already in db", user_name_exists)
     return False
 
 
@@ -199,7 +199,7 @@ def add_user_to_operation(path=None, access_level='admin', emailid=None):
                     return True
                 except IntegrityError as err:
                     db.session.rollback()
-                    logging.debug(f"Error writing to db: {err}")
+                    logging.debug("Error writing to db: %s", err)
                 db.session.close()
     return False
 
diff --git a/mslib/mscolab/sockets_manager.py b/mslib/mscolab/sockets_manager.py
index 4ce4a6d47..12239ed00 100644
--- a/mslib/mscolab/sockets_manager.py
+++ b/mslib/mscolab/sockets_manager.py
@@ -226,7 +226,7 @@ def handle_file_save(self, json_req):
                 # emit file-changed event to trigger reload of flight track
                 socketio.emit('file-changed', json.dumps({"op_id": op_id, "u_id": user.id}))
         else:
-            logging.debug(f'login expired for {user.username}, state unauthorized!')
+            logging.debug("login expired for %s, state unauthorized!", user.username)
 
     def emit_file_change(self, op_id):
         socketio.emit('file-changed', json.dumps({"op_id": op_id}))
diff --git a/mslib/mscolab/utils.py b/mslib/mscolab/utils.py
index 44b03deda..094cb7125 100644
--- a/mslib/mscolab/utils.py
+++ b/mslib/mscolab/utils.py
@@ -64,9 +64,9 @@ def os_fs_create_dir(dir):
         try:
             _ = fs.open_fs(dir)
         except fs.errors.CreateFailed:
-            logging.error(f'Make sure that the FS url "{dir}" exists')
+            logging.error('Make sure that the FS url "%s" exists', dir)
         except fs.opener.errors.UnsupportedProtocol:
-            logging.error(f'FS url "{dir}" not supported')
+            logging.error('FS url "%s" not supported', dir)
     else:
         _dir = os.path.expanduser(dir)
         if not os.path.exists(_dir):
diff --git a/mslib/msui/constants.py b/mslib/msui/constants.py
index b2715dd1e..97eb24bbf 100644
--- a/mslib/msui/constants.py
+++ b/mslib/msui/constants.py
@@ -40,7 +40,7 @@
     except fs.errors.CreateFailed:
         _fs.makedirs(MSUI_CONFIG_PATH)
     except fs.opener.errors.UnsupportedProtocol:
-        logging.error(f'FS url "{MSUI_CONFIG_PATH}" not supported')
+        logging.error('FS url "%s" not supported', MSUI_CONFIG_PATH)
 else:
     _dir = os.path.expanduser(MSUI_CONFIG_PATH)
     if not os.path.exists(_dir):
@@ -60,14 +60,14 @@
             with _fs.open(file_name, 'w') as fid:
                 fid.write("{}")
     except fs.errors.CreateFailed:
-        logging.error(f'"{MSUI_SETTINGS}" can''t be created')
+        logging.error('"%s" can''t be created', MSUI_SETTINGS)
 else:
     if not os.path.exists(MSUI_SETTINGS):
         try:
             with open(MSUI_SETTINGS, 'w') as fid:
                 fid.write("{}")
         except IOError:
-            logging.error(f'"{MSUI_SETTINGS}" can''t be created')
+            logging.error('"%s" can''t be created', MSUI_SETTINGS)
 
 # ToDo refactor to a function
 MSS_AUTOPLOT = os.getenv('MSS_AUTOPLOT', os.path.join(MSUI_CONFIG_PATH, "mssautoplot.json"))
@@ -82,14 +82,14 @@
             with _fs.open(file_name, 'w') as fid:
                 fid.write("{}")
     except fs.errors.CreateFailed:
-        logging.error(f'"{MSS_AUTOPLOT}" can''t be created')
+        logging.error('"%s" can''t be created', MSS_AUTOPLOT)
 else:
     if not os.path.exists(MSS_AUTOPLOT):
         try:
             with open(MSS_AUTOPLOT, 'w') as fid:
                 fid.write("{}")
         except IOError:
-            logging.error(f'"{MSS_AUTOPLOT}" can''t be created')
+            logging.error('"%s" can''t be created', MSS_AUTOPLOT)
 
 WMS_LOGIN_CACHE = {}
 MSC_LOGIN_CACHE = {}
diff --git a/mslib/msui/editor.py b/mslib/msui/editor.py
index 9585452ee..195a30ab0 100644
--- a/mslib/msui/editor.py
+++ b/mslib/msui/editor.py
@@ -400,7 +400,7 @@ def add_option_handler(self):
                 self.view.scrollTo(proxy_index)
                 self.view.selectionModel().select(
                     proxy_index, QtCore.QItemSelectionModel.ClearAndSelect | QtCore.QItemSelectionModel.Rows)
-                logging.debug(f"Added new value for {option}")
+                logging.debug("Added new value for %s", option)
                 self.update_view()
                 break
 
@@ -442,7 +442,7 @@ def remove_option_handler(self):
         # ToDo add confirmation dialog here
 
         options = "\n".join([index.data() for index in removable_indexes])
-        logging.debug(f"Attempting to remove the following options\n{options}")
+        logging.debug("Attempting to remove the following options\n%s", options)
 
         self.view.selectionModel().clearSelection()
         for index in removable_indexes:
@@ -499,7 +499,7 @@ def update(data, option, value):
         # ToDo add confirmation dialog here
 
         options = "\n".join([index.data() for index in selected_indexes])
-        logging.debug(f"Attempting to restore defaults for the following options\n{options}")
+        logging.debug("Attempting to restore defaults for the following options\n%s", options)
 
         for index in selected_indexes:
             # check if root option and present in mss_default.key_value_options
@@ -557,11 +557,11 @@ def import_config(self):
                     json_file_data = json.loads(file_content, object_pairs_hook=dict_raise_on_duplicates_empty)
                 except json.JSONDecodeError as e:
                     show_popup(self, "Error while loading file", e)
-                    logging.error(f"Error while loading json file {e}")
+                    logging.error("Error while loading json file %s", e)
                     return
                 except ValueError as e:
                     show_popup(self, "Invalid keys detected", e)
-                    logging.error(f"Error while loading json file {e}")
+                    logging.error("Error while loading json file %s", e)
                     return
 
         if json_file_data:
@@ -679,7 +679,7 @@ def save_config(self):
                     QtWidgets.QMessageBox.Yes | QtWidgets.QMessageBox.No,
                     QtWidgets.QMessageBox.No)
                 if ret == QtWidgets.QMessageBox.Yes:
-                    logging.debug(f"saving config file to: {self.path} and restarting MSS")
+                    logging.debug("saving config file to: %s and restarting MSS", self.path)
                     self._save_to_path(self.path)
                     self.restartApplication.emit()
                     self.restart_on_save = False
@@ -687,7 +687,7 @@ def save_config(self):
                 else:
                     return
             self.restart_on_save = True
-            logging.debug(f"saving config file to: {self.path}")
+            logging.debug("saving config file to: %s", self.path)
             self._save_to_path(self.path)
         else:
             self.statusbar.showMessage("No values changed")
diff --git a/mslib/msui/mpl_qtwidget.py b/mslib/msui/mpl_qtwidget.py
index 970a2689a..7d2f284b5 100644
--- a/mslib/msui/mpl_qtwidget.py
+++ b/mslib/msui/mpl_qtwidget.py
@@ -506,7 +506,7 @@ def draw_vertical_lines(self, highlight, lats, lons):
             try:
                 self.ax.lines.remove(line)
             except ValueError as e:
-                logging.debug(f"Vertical line was somehow already removed:\n{e}")
+                logging.debug("Vertical line was somehow already removed:\n%s", e)
             self.vertical_lines.remove(line)
 
         # Add vertical lines
@@ -655,7 +655,7 @@ def redraw_xaxis(self, lats, lons):
             try:
                 self.ax.lines.remove(line)
             except ValueError as e:
-                logging.debug(f"Vertical line was somehow already removed:\n{e}")
+                logging.debug("Vertical line was somehow already removed:\n%s", e)
         self.vertical_lines = []
 
     def draw_vertical_lines(self, highlight, lats, lons):
diff --git a/mslib/msui/mscolab.py b/mslib/msui/mscolab.py
index 0fc615086..b9e3686b4 100644
--- a/mslib/msui/mscolab.py
+++ b/mslib/msui/mscolab.py
@@ -363,7 +363,7 @@ def new_user_handler(self):
             try:
                 error_msg = json.loads(r.text)["message"]
             except Exception as e:
-                logging.debug(f"Unexpected error occured {e}")
+                logging.debug("Unexpected error occured %s", e)
                 error_msg = "Unexpected error occured. Please try again."
             self.set_status("Error", error_msg)
 
@@ -392,7 +392,7 @@ def newuser_server_auth(self):
             try:
                 error_msg = json.loads(r.text)["message"]
             except Exception as e:
-                logging.debug(f"Unexpected error occured {e}")
+                logging.debug("Unexpected error occured %s", e)
                 error_msg = "Unexpected error occured. Please try again."
             self.set_status("Error", error_msg)
         elif r.status_code == 204:
@@ -525,11 +525,11 @@ def create_dir(self):
             try:
                 _ = fs.open_fs(self.data_dir)
             except fs.errors.CreateFailed:
-                logging.error(f'Make sure that the FS url "{self.data_dir}" exists')
+                logging.error('Make sure that the FS url "%s" exists', self.data_dir)
                 show_popup(self.ui, "Error", f'FS Url: "{self.data_dir}" does not exist!')
                 sys.exit()
             except fs.opener.errors.UnsupportedProtocol:
-                logging.error(f'FS url "{self.data_dir}" not supported')
+                logging.error('FS url "%s" not supported', self.data_dir)
                 show_popup(self.ui, "Error", f'FS Url: "{self.data_dir}" not supported!')
                 sys.exit()
         else:
@@ -573,7 +573,7 @@ def after_login(self, emailid, url, r):
         try:
             self.conn = sc.ConnectionManager(self.token, user=self.user, mscolab_server_url=self.mscolab_server_url)
         except Exception as ex:
-            logging.debug(f"Couldn't create a socket connection: {ex}")
+            logging.debug("Couldn't create a socket connection: %s", ex)
             show_popup(self.ui, "Error", "Couldn't create a socket connection. Maybe the mscolab server is too old."
                                          "New Login required!")
             self.logout()
@@ -1384,7 +1384,7 @@ def delete_operation_from_list(self, op_id):
                 remove_item = item
                 break
         if remove_item is not None:
-            logging.debug(f"remove_item: {remove_item}")
+            logging.debug("remove_item: %s", remove_item)
             self.ui.listOperationsMSC.takeItem(self.ui.listOperationsMSC.row(remove_item))
             return remove_item.operation_path
 
diff --git a/mslib/msui/multilayers.py b/mslib/msui/multilayers.py
index 0c4352c2d..7219ea9a7 100644
--- a/mslib/msui/multilayers.py
+++ b/mslib/msui/multilayers.py
@@ -619,7 +619,7 @@ def _parse_itimes(self):
             self.allowed_init_times = sorted(self.parent.dock_widget.parse_time_extent(values))
             self.itimes = [_time.isoformat() + "Z" for _time in self.allowed_init_times]
             if len(self.allowed_init_times) == 0:
-                logging.error(f"Cannot determine init time format of {self.header.text(0)} for {self.text(0)}")
+                logging.error("Cannot determine init time format of %s for %s", self.header.text(0), self.text(0))
                 self.is_invalid = True
             else:
                 self.itime = self.itimes[-1]
@@ -638,7 +638,7 @@ def _parse_vtimes(self):
             self.allowed_valid_times = sorted(self.parent.dock_widget.parse_time_extent(values))
             self.vtimes = [_time.isoformat() + "Z" for _time in self.allowed_valid_times]
             if len(self.allowed_valid_times) == 0:
-                logging.error(f"Cannot determine valid time format of {self.header.text(0)} for {self.text(0)}")
+                logging.error("Cannot determine valid time format of %s for %s", self.header.text(0), self.text(0))
                 self.is_invalid = True
             else:
                 if self.itime:
diff --git a/mslib/mswms/gallery_builder.py b/mslib/mswms/gallery_builder.py
index cdd31c258..3c01fd88f 100644
--- a/mslib/mswms/gallery_builder.py
+++ b/mslib/mswms/gallery_builder.py
@@ -43,7 +43,7 @@
     else:
         STATIC_LOCATION = os.path.join(os.path.dirname(os.path.abspath(mswms_settings.__file__)), "gallery")
 except ImportError as e:
-    logging.warning(f"{e}. Can't generate gallery.")
+    logging.warning("%s. Can't generate gallery.", e)
 
 DOCS_LOCATION = os.path.join(os.path.dirname(os.path.abspath(__file__)), "..", "..", "docs", "gallery")
 
@@ -457,7 +457,7 @@ def write_html(path, sphinx=False, plot_types=None):
 
     with open(os.path.join(path, "plots.html"), "w+") as file:
         file.write(html + end)
-        logging.info(f"plots.html created at {os.path.join(path, 'plots.html')}")
+        logging.info("plots.html created at %s", os.path.join(path, 'plots.html'))
 
 
 def import_instructions(plot_object, l_type, layer, native_import=None, dataset=""):
diff --git a/mslib/mswms/wms.py b/mslib/mswms/wms.py
index fe4a4a6ac..2ef697f72 100644
--- a/mslib/mswms/wms.py
+++ b/mslib/mswms/wms.py
@@ -283,9 +283,10 @@ def generate_gallery(self, create=False, clear=False, generate_code=False, sphin
 
                             for itime in sorted(init_times):
                                 if itime and plot_driver.get_init_times() and itime not in plot_driver.get_init_times():
-                                    logging.warning(f"Requested itime {itime} not present for "
-                                                    f"{dataset} {plot_object.name}! itimes present: "
-                                                    f"{plot_driver.get_init_times()}")
+                                    logging.warning("Requested itime %s not present for "
+                                                    "%s %s! itimes present: "
+                                                    "%s", itime, dataset, plot_object.name, plot_driver.get_init_times()
+                                                    )
                                     continue
                                 elif not plot_driver.get_init_times():
                                     itime = None
@@ -309,8 +310,9 @@ def generate_gallery(self, create=False, clear=False, generate_code=False, sphin
 
                                 for vtime in sorted(valid_times):
                                     if vtime and i_vtimes and vtime not in i_vtimes:
-                                        logging.warning(f"Requested vtime {vtime} at {itime} not present for "
-                                                        f"{dataset} {plot_object.name}! vtimes present: {i_vtimes}")
+                                        logging.warning("Requested vtime %s at %s not present for "
+                                                        "%s %s! vtimes present: %s", vtime, itime, dataset,
+                                                        plot_object.name, i_vtimes)
                                         continue
                                     elif not i_vtimes:
                                         vtime = None
@@ -372,9 +374,9 @@ def generate_gallery(self, create=False, clear=False, generate_code=False, sphin
                                         for level in sorted(rendered_levels):
                                             if level and elevations and level \
                                                     not in [float(elev) for elev in elevations]:
-                                                logging.warning(f"Requested level {level} not present for "
-                                                                f"{dataset} {plot_object.name}! Levels present: "
-                                                                f"{elevations}")
+                                                logging.warning("Requested level %s not present for "
+                                                                "%s %s! Levels present: "
+                                                                "%s", level, dataset, plot_object.name, elevations)
                                                 continue
                                             elif not elevations:
                                                 level = None
diff --git a/mslib/utils/airdata.py b/mslib/utils/airdata.py
index 033b5e9db..8043fc1a5 100644
--- a/mslib/utils/airdata.py
+++ b/mslib/utils/airdata.py
@@ -60,13 +60,13 @@
                  ]
 
 
-def download_progress(file_path, url, progress_callback=lambda f: logging.info(f"{int(f)}KB Downloaded")):
+def download_progress(file_path, url, progress_callback=lambda f: logging.info("%sKB Downloaded", int(f))):
     """
     Downloads the file at the given url to file_path and keeps track of the progress
     """
     try:
         with open(file_path, "wb+") as file:
-            logging.info(f"Downloading to {file_path}. This might take a while.")
+            logging.info("Downloading to %s. This might take a while.", file_path)
             response = requests.get(url, stream=True, timeout=5)
             length = response.headers.get("content-length")
             if length is None:  # no content length header
diff --git a/mslib/utils/config.py b/mslib/utils/config.py
index 694b8964a..db1fb530b 100644
--- a/mslib/utils/config.py
+++ b/mslib/utils/config.py
@@ -376,11 +376,11 @@ def read_config_file(path=constants.MSUI_SETTINGS):
             try:
                 json_file_data = json.loads(file_content, object_pairs_hook=dict_raise_on_duplicates_empty)
             except json.JSONDecodeError as e:
-                logging.error(f"Error while loading json file {e}")
+                logging.error("Error while loading json file %s", e)
                 error_message = f"Unexpected error while loading config\n{e}"
                 raise FatalUserError(error_message)
             except ValueError as e:
-                logging.error(f"Error while loading json file {e}")
+                logging.error("Error while loading json file %s", e)
                 error_message = f"Invalid keys detected in config\n{e}"
                 raise FatalUserError(error_message)
         else:
@@ -424,11 +424,11 @@ def modify_config_file(data, path=constants.MSUI_SETTINGS):
                 _fs.writetext(file_name, json.dumps(modified_data, indent=4))
                 read_config_file()
             except json.JSONDecodeError as e:
-                logging.error(f"Error while loading json file {e}")
+                logging.error("Error while loading json file %s", e)
                 error_message = f"Unexpected error while loading config\n{e}"
                 raise FatalUserError(error_message)
             except ValueError as e:
-                logging.error(f"Error while loading json file {e}")
+                logging.error("Error while loading json file %s", e)
                 error_message = f"Invalid keys detected in config\n{e}"
                 raise FatalUserError(error_message)
         else: