diff --git a/frontend/src/lib/utils/security.ts b/frontend/src/lib/utils/security.ts
index 9d8bb0848f395da91a0346892433d4e36617ffca..734f5f63242709d53e11e916b0b1e222e2837c2f 100644
--- a/frontend/src/lib/utils/security.ts
+++ b/frontend/src/lib/utils/security.ts
@@ -28,12 +28,7 @@ export function validateEmail(email: unknown): email is string {
 }
 
 export function validateUsername(username: unknown): username is string {
-	return (
-		typeof username === 'string' &&
-		username.length >= 3 &&
-		username.length <= 31 &&
-		/^[a-z0-9_-]+$/.test(username)
-	);
+	return typeof username === 'string' && username.length >= 3 && username.length <= 31;
 }
 
 export function validatePassword(password: unknown): password is string {