diff --git a/protonenv/config.py b/protonenv/config.py
index 71a262d..f272344 100644
--- a/protonenv/config.py
+++ b/protonenv/config.py
@@ -1,19 +1,30 @@
 import os
+from dataclasses import dataclass
+
+from .utils import json_load
 
 # ---
 
-class Configuration(object):
-	def __init__(self, dictionary=None):
-		if dictionary is not None:
-			self.__dict__.update(dictionary)
+HOME_DIR = os.path.expanduser("~")
+PROTONENV_DIR = os.path.join(HOME_DIR, '.protonenv')
+
 
+@dataclass
+class Configuration:
+	common_dir: str = os.path.join(HOME_DIR, '.steam/debian-installation/steamapps/common')
+	protonenv_dir: str = PROTONENV_DIR
+	prefixes_dir: str = os.path.join(PROTONENV_DIR, 'prefixes')
+	temporary_dir: str = os.path.join(PROTONENV_DIR, 'temp')
+	config_path: str = os.path.join(PROTONENV_DIR, 'config.json')
+
+	def read_json(self):
+		json_config = json_load(self.config_path)
+		for k in ["common_dir", "protonenv_dir", "prefixes_dir", "temporary_dir", "config_path"]:
+			if k in json_config:
+				self.__setattr__(k, json_config[k])
+
+		return self
 # ---
 
-HOME_DIR = os.path.expanduser("~")
 
-config = Configuration()
-config.common_dir = os.path.join(HOME_DIR, '.steam/debian-installation/steamapps/common')
-config.protonenv_dir = os.path.join(HOME_DIR, '.protonenv')
-config.prefixes_dir = os.path.join(config.protonenv_dir, 'prefixes')
-config.temporary_dir = os.path.join(config.protonenv_dir, 'temp')
-config.config_path = os.path.join(config.protonenv_dir, 'config.json')
\ No newline at end of file
+config = Configuration().read_json()
diff --git a/protonenv/core.py b/protonenv/core.py
index abf4387..5ab1a55 100644
--- a/protonenv/core.py
+++ b/protonenv/core.py
@@ -38,7 +38,7 @@ def ask_common_dir():
 			ans = config.common_dir
 		if os.path.exists(ans):
 			break
-		print(f'{ans} does not exists, try again...')
+		print(f'{ans} does not exist, try again...')
 	return ans
 
 
@@ -118,9 +118,9 @@ def uninstall(args):
 @subcommand([Argument("version", help="Proton version"), Argument("prefix", help="Prefix name")])
 def prefix(args):
 	if prefix_exists(args.prefix):
-		die(f'Prefix "{args.prefix}" has already exists.')
+		die(f'Prefix "{args.prefix}" already exists.')
 	if not proton_exists(args.version):
-		die(f'Proton {args.version} does not exists.')
+		die(f'Proton {args.version} does not exist.')
 	os.makedirs(get_prefix_path(args.prefix))
 	prefix_config = {"version": args.version}
 	prefix_config_save(args.prefix, prefix_config)
@@ -129,7 +129,7 @@ def prefix(args):
 @subcommand([Argument("prefix", help="Prefix name"), Argument("--flags", help="Environment variable: KEY=VALUE", nargs='+'), Argument("--command", help="Default command")])
 def default(args):
 	if not prefix_exists(args.prefix):
-		die(f'Prefix {args.prefix} does not exists.')
+		die(f'Prefix {args.prefix} does not exist.')
 	prefix_config = prefix_config_load(args.prefix)
 	if args.command:
 		prefix_config['command'] = args.command
@@ -151,7 +151,7 @@ def default(args):
 @subcommand([Argument("prefix", help="Prefix name")])
 def info(args):
 	if not prefix_exists(args.prefix):
-		die(f'Prefix {args.prefix} does not exists.')
+		die(f'Prefix {args.prefix} does not exist.')
 	prefix_config = prefix_config_load(args.prefix)
 	die(f'\
 {args.prefix}\n\
@@ -164,7 +164,7 @@ def info(args):
 @subcommand([Argument("prefix", help="Prefix name"), Argument("--open", action="store_true", help="Open the directory")])
 def directory(args):
 	if not prefix_exists(args.prefix):
-		die(f'Prefix {args.prefix} does not exists.')
+		die(f'Prefix {args.prefix} does not exist.')
 	content_path = get_prefix_content_path(args.prefix)
 	if args.open:
 		cmd_exec(f'xdg-open {content_path}')
@@ -174,7 +174,7 @@ def directory(args):
 def run(args):
 	if not prefix_exists(args.name):
 		if not proton_exists(args.name):
-			die(f'{args.name} does not exists.')
+			die(f'{args.name} does not exist.')
 		if not args.command:
 			die('Command is not specified.')
 		proton_exec(args.name, None, args.command)
@@ -193,4 +193,4 @@ def main():
 	if args.subcommand is None:
 		cli.print_help()
 	else:
-		args.func(args)
\ No newline at end of file
+		args.func(args)
diff --git a/protonenv/core_utils.py b/protonenv/core_utils.py
index 5acfe32..a206b05 100644
--- a/protonenv/core_utils.py
+++ b/protonenv/core_utils.py
@@ -30,7 +30,7 @@ def proton_exists(version):
 	return os.path.exists(get_proton_exec_path(version))
 
 def config_load():
-	return Configuration(json_load(config.config_path))
+	return Configuration().read_json()
 
 def config_save(content):
 	json_dump(config.config_path, vars(content))
diff --git a/protonenv/proton.json b/protonenv/proton.json
index a0d0e28..98bd0ba 100644
--- a/protonenv/proton.json
+++ b/protonenv/proton.json
@@ -4,5 +4,6 @@
 	"4.2"	: "1054830",
 	"4.11"	: "1113280",
 	"5.0"	: "1245040",
-	"5.13"	: "1420170"
+	"5.13"	: "1420170",
+	"6.3"   : "1580130"
 }
\ No newline at end of file