diff --git a/trading_assistant_api/services/user/internal/service/user_service.go b/trading_assistant_api/services/user/internal/service/user_service.go
index 1a30181..6001da1 100644
--- a/trading_assistant_api/services/user/internal/service/user_service.go
+++ b/trading_assistant_api/services/user/internal/service/user_service.go
@@ -75,12 +75,12 @@ func (s *Service) Login(account, password string) (string, error) {
 
 func validAccount(a string) bool {
 	n := len(a)
-	return n >= 3 && n <= 100
+	return n >= 3 && n <= 20
 }
 
 func validPassword(p string) bool {
 	n := len(p)
-	return n >= 8 && n <= 128
+	return n >= 8 && n <= 20
 }
 
 func isUniqueViolation(err error) bool {