diff --git a/archinstall/lib/models/authentication.py b/archinstall/lib/models/authentication.py
index 31441387..66c77786 100644
--- a/archinstall/lib/models/authentication.py
+++ b/archinstall/lib/models/authentication.py
@@ -44,7 +44,7 @@ class U2FLoginConfiguration:
 	def parse_arg(args: U2FLoginConfigSerialization) -> 'U2FLoginConfiguration | None':
 		u2f_login_method = args.get('u2f_login_method')
 
-		if u2f_login_method is None:
+		if not u2f_login_method:
 			return None
 
 		u2f_config = U2FLoginConfiguration(u2f_login_method=U2FLoginMethod(u2f_login_method))
diff --git a/archinstall/lib/models/users.py b/archinstall/lib/models/users.py
index 3f18f52d..8ff1a31a 100644
--- a/archinstall/lib/models/users.py
+++ b/archinstall/lib/models/users.py
@@ -201,7 +201,7 @@ class User:
 			elif enc_password:
 				password = Password(enc_password=enc_password)
 
-			if username is None or password is None:
+			if not username or password is None:
 				continue
 
 			user = User(
diff --git a/pyproject.toml b/pyproject.toml
index 2f04942b..af38e603 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -33,7 +33,7 @@ Source = "https://github.com/archlinux/archinstall"
 [project.optional-dependencies]
 log = ["systemd_python==235"]
 dev = [
-    "mypy==1.18.2",
+    "mypy==1.19.0",
     "flake8==7.3.0",
     "pre-commit==4.5.0",
     "ruff==0.14.8",