diff --git a/plugins/module_utils/base.py b/plugins/module_utils/base.py
index 0b810ca..e3e3a6f 100644
--- a/plugins/module_utils/base.py
+++ b/plugins/module_utils/base.py
@@ -138,7 +138,7 @@ def __init__(self, params, module=None):
                     self.params['token'] = f.read().strip()
 
     def _open_url(self, path, method, data=None, fatal=True):
-        url = '{0}/v1/{1}'.format(self.params['vault_addr'], path)
+        url = f'{self.params["vault_addr"]}/v1/{path}'
 
         headers = {}
         if self.params.get('token'):
@@ -178,7 +178,7 @@ def _open_url(self, path, method, data=None, fatal=True):
 
             except HTTPError as e:
                 if fatal and self._module:
-                    msg = 'Failed to {0} {1}: {2} (HTTP {3})'.format(method, path, e.reason, e.code)
+                    msg = f'Failed to {method} {path}: {e.reason} (HTTP {e.code})'
                     result = {}
                     try:
                         result = json.loads(e.read())
@@ -194,7 +194,7 @@ def _open_url(self, path, method, data=None, fatal=True):
 
             except URLError as e:
                 if fatal and self._module:
-                    self._module.fail_json(msg='Failed to {0} {1}: {2}'.format(method, path, e.reason))
+                    self._module.fail_json(msg=f'Failed to {method} {path}: {e.reason}')
                 raise
 
     def get(self, path, fatal=True):
@@ -216,6 +216,6 @@ def delete(self, path, fatal=True):
             if getattr(e, 'code', 0) == 404:
                 return False
             if fatal and self._module:
-                self._module.fail_json(msg='Failed to DELETE {0}: {1}'.format(path, e.reason))
+                self._module.fail_json(msg=f'Failed to DELETE {path}: {e.reason}')
             raise
         return True
diff --git a/plugins/module_utils/mount.py b/plugins/module_utils/mount.py
index fc67314..daf8462 100644
--- a/plugins/module_utils/mount.py
+++ b/plugins/module_utils/mount.py
@@ -72,7 +72,7 @@ def run(self):
                 self.module.exit_json(changed=False)
 
             if not self.module.check_mode:
-                self.client.delete('{0}/{1}'.format(self.base_path, path))
+                self.client.delete(f'{self.base_path}/{path}')
             self.module.exit_json(changed=True, mount=mount)
 
         changed = False
@@ -96,7 +96,7 @@ def run(self):
             for key, val in self.params['options'].items():
                 payload['options'][key] = str(val)
 
-        mount_path = '{0}/{1}'.format(self.base_path, path)
+        mount_path = f'{self.base_path}/{path}'
         if not mount:
             changed = True
             if not self.module.check_mode:
@@ -110,7 +110,7 @@ def run(self):
                 if not self.module.check_mode:
                     if mount['type'] != payload['type']:
                         if not self.params['force']:
-                            self.module.fail_json('Existing mount at {0} is {1} and force is false'.format(mount_path, mount['type']))
+                            self.module.fail_json(f'Existing mount at {mount_path} is {mount["type"]} and force is false')
                         self.client.delete(mount_path)
                         self.client.post(mount_path, data=payload)
                     else:
@@ -123,7 +123,7 @@ def run(self):
                             if key not in payload:
                                 payload[key] = None
 
-                        self.client.post('{0}/{1}/tune'.format(self.base_path, path), data=payload)
+                        self.client.post(f'{self.base_path}/{path}/tune', data=payload)
                     mount = self._get_mount(path)
 
         self.module.exit_json(changed=changed, mount=mount, diff=diff)