diff --git a/rotate-keys b/rotate-keys
index 140950e..5baed14 100755
--- a/rotate-keys
+++ b/rotate-keys
@@ -83,7 +83,7 @@ def create_new_key(iam, user):
         if 'Error' in err.response:
             print("Key not created")
             if err.response['Error']['Code'] == 'LimitExceeded':
-                print("User {} already has the maximum number of keys".format(user))
+                print(f"User {user} already has the maximum number of keys")
 
     return new_key
 
@@ -98,12 +98,12 @@ def rotate_key(session, user):
     LOG.debug("Getting user key limit for account...")
     key_limit = iam.get_account_summary()['SummaryMap']['AccessKeysPerUserQuota']
     
-    LOG.debug("User key limit: {}".format(key_limit))
+    LOG.debug(f"User key limit: {key_limit}")
     
     LOG.debug("Getting user's keys...")
     user_keys = iam.list_access_keys()['AccessKeyMetadata']
 
-    LOG.debug("Found {} keys for user {}".format(len(user_keys), user))
+    LOG.debug(f"Found {len(user_keys)} keys for user {user}")
 
     LOG.debug("Check to see if user has the limit of keys allowed...")
     if len(user_keys) == key_limit:
@@ -122,7 +122,7 @@ def update_credentials_file(credentials_file, profile_name, key, set_default):
     credentials = configparser.ConfigParser()
     credentials.read(credentials_file)
 
-    LOG.debug("credentials = {}".format(credentials.sections()))
+    LOG.debug(f"credentials = {credentials.sections()}")
 
     if not profile_name in credentials.sections():
         LOG.debug("Profile does not exist in credentials file; creating now...")
@@ -132,8 +132,8 @@ def update_credentials_file(credentials_file, profile_name, key, set_default):
     profile_creds['aws_access_key_id'] = key['AccessKey']['AccessKeyId']
     profile_creds['aws_secret_access_key'] = key['AccessKey']['SecretAccessKey']
 
-    LOG.debug("Profile: {}, keys: {}, {}".format(profile_name, profile_creds['aws_access_key_id'], profile_creds['aws_secret_access_key']))
-    LOG.debug("credentials = {}".format([x for x in credentials[profile_name]]))
+    LOG.debug(f"Profile: {profile_name}, keys: {profile_creds['aws_access_key_id']}, {profile_creds['aws_secret_access_key']}")
+    LOG.debug(f"credentials = {[x for x in credentials[profile_name]]}"))
 
     # make the keys also be the default keys if the toggle is set
     if set_default:
@@ -145,8 +145,8 @@ def update_credentials_file(credentials_file, profile_name, key, set_default):
         default_creds['aws_access_key_id'] = key['AccessKey']['AccessKeyId']
         default_creds['aws_secret_access_key'] = key['AccessKey']['SecretAccessKey']
 
-        LOG.debug("Profile: default, keys: {}, {}".format(default_creds['aws_access_key_id'], default_creds['aws_secret_access_key']))
-        LOG.debug("credentials = {}".format([x for x in credentials['default']]))
+        LOG.debug(f"Profile: default, keys: {default_creds['aws_access_key_id'],}, {default_creds['aws_secret_access_key']}")
+        LOG.debug(f"credentials = {[x for x in credentials['default']]}")
 
     LOG.debug("Writing updated credentials file...")
     with open(credentials_file, 'w') as cred_file:
@@ -162,14 +162,14 @@ def main():
         LOG.setLevel(logging.DEBUG)
         logging.getLogger('botocore').setLevel(logging.WARNING)
 
-    LOG.debug("Getting AWS session and credentials for {}...".format(args.profile_name))
+    LOG.debug(f"Getting AWS session and credentials for {args.profile_name}...")
     session = boto3.session.Session(region_name='us-east-1', profile_name=args.profile_name)
     credentials = session.get_credentials()
 
     credentials_file = os.path.expanduser(args.credentials_file)
-    LOG.debug("credentials_file = {}".format(credentials_file))
+    LOG.debug(f"credentials_file = {credentials_file}")
 
-    print("Generating new AWS keys for user {}...".format(args.user))
+    print(f"Generating new AWS keys for user {args.user}...")
     new_key = rotate_key(session, args.user)
 
     if new_key:
diff --git a/rotate-ssh-keys b/rotate-ssh-keys
index 9eb4ef4..8296e31 100755
--- a/rotate-ssh-keys
+++ b/rotate-ssh-keys
@@ -27,6 +27,8 @@ from cryptography.hazmat.primitives import serialization as crypto_serialization
 from cryptography.hazmat.primitives.asymmetric import rsa 
 from cryptography.hazmat.backends import default_backend as crypto_default_backend
 
+from paramiko import SSHClient, AutoAddPolicy
+
 
 # setting up logging for this script
 _LEVEL = logging.INFO
@@ -354,7 +356,7 @@ def switch_keys_on_instances(session, new_key, old_key_name, remove_old_key_only
             for y in x['Instances']
     ]
 
-
+    
 
 
 def main():