diff --git a/Cargo.toml b/Cargo.toml
index 4948d04..5f6fcbe 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "rust_util"
-version = "0.6.10"
+version = "0.6.11"
 authors = ["Hatter Jiang <jht5945@gmail.com>"]
 edition = "2018"
 description = "Hatter's Rust Util"
@@ -9,12 +9,12 @@ readme = "README.md"
 
 [features]
 default = [] #["serde", "serde_json"]
-use_serde = ["serde", "serde_json"]
+# use_serde = ["serde", "serde_json"]
 
 [dependencies]
 libc = "0.2.65"
 term = "0.5.2"
 term_size = "0.3.1"
 lazy_static = "1.3.0"
-serde = { version = "1.0", features = ["derive"], optional = true }
-serde_json = { version = "1.0", optional = true }
+# serde = { version = "1.0", features = ["derive"], optional = true }
+# serde_json = { version = "1.0", optional = true }
diff --git a/src/util_file.rs b/src/util_file.rs
index 266d714..76560c0 100644
--- a/src/util_file.rs
+++ b/src/util_file.rs
@@ -1,11 +1,9 @@
-
 use std::{
     env,
     fs::{ self, File },
     io::{ Lines, BufReader },
     path::{ Path, PathBuf },
 };
-
 use crate::{
     iff,
     util_os,
@@ -118,18 +116,6 @@ pub fn find_parents_exists_dir(dir: &str) -> Option<PathBuf> {
     }
 }
 
-#[cfg(feature = "use_serde")]
-pub fn read_json_config<T>(config: Option<String>, files: &[String]) -> XResult<Option<(PathBuf, T)>> where T: serde::de::DeserializeOwned {
-    let config_path_buf_opt = read_config(config, files);
-    match config_path_buf_opt {
-        None => Ok(None),
-        Some(config_path_buf) => {
-            let json_config: T = serde_json::from_reader(std::fs::File::open(&config_path_buf)?)?;
-            Ok(Some((config_path_buf, json_config)))
-        }
-    }
-}
-
 pub fn read_config(config: Option<String>, files: &[String]) -> Option<PathBuf> {
     match config {
         Some(config_str) => Some(PathBuf::from(config_str)),