diff --git a/installation_and_upgrade/ibex_install_utils/tasks/mysql_tasks.py b/installation_and_upgrade/ibex_install_utils/tasks/mysql_tasks.py
index 78eeec3..d448923 100644
--- a/installation_and_upgrade/ibex_install_utils/tasks/mysql_tasks.py
+++ b/installation_and_upgrade/ibex_install_utils/tasks/mysql_tasks.py
@@ -64,7 +64,7 @@ class MysqlTasks(BaseTasks):
     Tasks relating to installing or maintaining an installation of MySQL on a machine.
     """
 
-    def _get_mysql_dir(self):
+    def _get_mysql_dir(self) -> str:
         """
         Returns the mysql 8 default install directory if it exists, else 5.7.
 
@@ -76,7 +76,7 @@ def _get_mysql_dir(self):
 
         return mysql_bin_dir
 
-    def _get_mysql_backup_dir(self):
+    def _get_mysql_backup_dir(self) -> str:
         mysql_backup_dir = os.path.join(
             STAGE_DELETED,
             self._get_machine_name(),
@@ -87,14 +87,16 @@ def _get_mysql_backup_dir(self):
         return mysql_backup_dir
 
     @task("Truncate database")
-    def truncate_database(self):
+    def truncate_database(self) -> None:
         """
         Truncate the message log, sample and alarms tables
         """
         try:
             mysql_bin_dir = self._get_mysql_dir()
 
-            sql_command = "truncate table msg_log.message;truncate table archive.sample;truncate table alarm.pv"
+            sql_command = ("truncate table msg_log.message;"
+                           "truncate table archive.sample;"
+                           "truncate table alarm.pv")
 
             RunProcess(
                 MYSQL_FILES_DIR,
@@ -110,7 +112,7 @@ def truncate_database(self):
                 f"Error is {ex}"
             )
 
-    def _configure_mysql(self):
+    def _configure_mysql(self) -> None:
         """
         Copy mysql settings and run the MySQL configuration script
         """
@@ -131,7 +133,7 @@ def _configure_mysql(self):
         admin_commands.add_command("sc", "start MYSQL80", expected_return_val=None)
         admin_commands.run_all()
 
-    def _remove_old_versions_of_mysql8(self, clean_install):
+    def _remove_old_versions_of_mysql8(self, clean_install: bool) -> None:
         if clean_install:
             self.prompt.prompt_and_raise_if_not_yes(
                 "Warning: this will erase all data held in the MySQL database. "
@@ -151,11 +153,11 @@ def _remove_old_versions_of_mysql8(self, clean_install):
         if clean_install:
             self._remove_old_mysql_data_dir()
 
-    def _remove_old_mysql_data_dir(self):
+    def _remove_old_mysql_data_dir(self) -> None:
         if os.path.exists(MYSQL_FILES_DIR):
             shutil.rmtree(MYSQL_FILES_DIR)
 
-    def _create_mysql_binaries(self):
+    def _create_mysql_binaries(self) -> None:
         os.makedirs(MYSQL8_INSTALL_DIR)
 
         mysql_unzip_temp = os.path.join(APPS_BASE_DIR, "temp-mysql-unzip")
@@ -171,7 +173,7 @@ def _create_mysql_binaries(self):
 
         shutil.rmtree(mysql_unzip_temp)
 
-    def _initialize_mysql_data_area_for_vhd(self):
+    def _initialize_mysql_data_area_for_vhd(self) -> None:
         os.makedirs(os.path.join(MYSQL_FILES_DIR, "data"))
 
         RunProcess(