diff --git a/jwtcat.py b/jwtcat.py
index 44ccd44..31623c8 100755
--- a/jwtcat.py
+++ b/jwtcat.py
@@ -22,13 +22,14 @@
 import time
 from datetime import datetime, timedelta
 from itertools import chain, product
+from concurrent.futures import ProcessPoolExecutor  # Improvement 1: For multiprocessing
 
 import coloredlogs
 import jwt
 from tqdm import tqdm
 
 logger = logging.getLogger(__name__)
-coloredlogs.install(level='DEBUG', milliseconds=True)
+coloredlogs.install(level='DEBUG', milliseconds=True, fmt='%(asctime)s %(levelname)s %(message)s')
 
 
 def parse_args():
@@ -105,16 +106,11 @@ def parse_args():
 
     parser.add_argument(
         "-lL", "--log-level",
-        default=logging.INFO,
-        dest="log_level",
-        # TODO: Improve how to retrieve all log levels
-        choices=[
-            'DEBUG',
-            'INFO',
-        ],
+        default='logging.INFO',
+        choices=logging._nameToLevel.keys(),  # Improvement 2: Retrieve all log levels dynamically
         help="Set the logging level",
-        type=str,
-        required=False,
+        type = str,
+        required=False
     )
 
     parser.add_argument(
@@ -222,15 +218,12 @@ def is_vulnerable(args):
         args {object} -- The command-line arguments
     """
     headers = jwt.get_unverified_header(args.token)
+    alg = headers.get('alg')
+    if alg in ["HS256", "HS512", "HS384", "None"]:
+        logger.info(f"JWT potentially vulnerable with algorithm: {alg}")
+    else:
+        logger.warning(f"JWT signed with non-vulnerable algorithm: {alg}")
 
-    if headers['alg'] == "HS256":
-        logging.info("JWT vulnerable to HS256 guessing attacks")
-    elif headers['alg'] == "HS512":
-        logging.info("JWT vulnerable to HS512 guessing attacks")
-    elif headers['alg'] == "HS384":
-        logging.info("JWT vulnerable to HS384 guessing attacks")
-    elif headers['alg'] == "None":
-        logging.info("JWT vulnerable to CVE-2018-1000531")
 
 
 def hs256_attack(args):
@@ -241,29 +234,31 @@ def hs256_attack(args):
         args {object} -- The command-line arguments
     """
     headers = jwt.get_unverified_header(args.token)
-    
-    if not headers['alg'] == "HS256" and not headers['alg'] == "HS512" and not headers['alg'] == "HS384":
-        logging.error("JWT signed using an algorithm other than HS256 or HS512 or HS384")
-    else:
-        tqdm_disable = True if args.log_level == "DEBUG" else False
-
-        if args.attack_mode == "brute-force":
-            # Count = ....
-            for candidate in tqdm(bruteforce(args.charset, args.increment_min, args.increment_max), disable=tqdm_disable):
-                if run(args.token, candidate):
-                    return candidate
-
-            return None
-
-        elif args.attack_mode == "wordlist":
-            word_count = len(open(args.wordlist.name, "r",
-                                  encoding="utf-8",
-                                  errors="ignore").readlines())
-            for entry in tqdm(args.wordlist, disable=tqdm_disable, total=word_count):
-                if run(args.token, entry.rstrip()):
-                    return entry.rstrip()
+    if headers['alg'] not in ["HS256", "HS512", "HS384"]:
+        logger.error("JWT signed using unsupported algorithm")
+        return None
+
+    tqdm_disable = args.log_level == "DEBUG"
+    candidate = None
+
+    if args.attack_mode == "brute-force":
+        # Improvement: Use multiprocessing for brute-force attack
+        with ProcessPoolExecutor() as executor:
+            for result in tqdm(executor.map(lambda x: run(args.token, x), bruteforce(args.charset, args.increment_min, args.increment_max)), disable=tqdm_disable):
+                if result:
+                    candidate = result
+                    break
+    elif args.attack_mode == "wordlist":
+        # Improved batch reading for wordlist mode to reduce I/O time
+        wordlist = [line.strip() for line in args.wordlist]
+        with ProcessPoolExecutor() as executor:
+            for result in tqdm(executor.map(lambda word: run(args.token, word), wordlist), disable=tqdm_disable, total=len(wordlist)):
+                if result:
+                    candidate = result
+                    break
+
+    return candidate
 
-            return None
 
 
 def main():
diff --git a/requirements.txt b/requirements.txt
index 8029220..89e8d9a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
-autopep8==1.5.2
-coloredlogs==14.0
-humanfriendly==8.2
-pycodestyle==2.6.0
-PyJWT==2.4.0
-pyreadline==2.1
-tqdm==4.46.0
+autopep8==1.6.0            # Updated from 1.5.2 to 1.6.0
+coloredlogs==15.0.1        # Updated from 14.0 to 15.0.1
+humanfriendly==10.0        # Updated from 8.2 to 10.0
+pycodestyle==2.10.0       # Updated from 2.6.0 to 2.10.0
+PyJWT==2.6.0               # Updated from 2.4.0 to 2.6.0
+pyreadline==2.1            # No update available
+tqdm==4.65.0               # Updated from 4.46.0 to 4.65.0