diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index 55a4169..835ce82 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -15,7 +15,7 @@ jobs:
           # it's an unstable feature.
           rust-version: nightly
       - uses: actions/checkout@v4
-      - run: cargo +nightly fmt -- --check --config-path <(echo 'license_template_path = "HEADER"')
+      - run: cargo +nightly fmt -- --check
 
   lint:
     runs-on: ubuntu-latest
@@ -33,7 +33,9 @@ jobs:
       - name: Set up Rust
         uses: hecrj/setup-rust-action@v2
       - uses: actions/checkout@master
-      - run: cargo check --all-targets --all-features
+      - run: |
+          cargo check --all-targets --all-features
+          cargo check --no-default-features
 
   test:
     strategy:
diff --git a/Cargo.toml b/Cargo.toml
index efd4ff2..279f049 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,5 +1,5 @@
 [workspace.package]
-version = "2.0.0"
+version = "2.1.0"
 edition = "2021"
 authors = ["baoyachi <liaoymxsdl@gmail.com>"]
 description = "A simple log. It's really simple use"
@@ -26,10 +26,10 @@ license.workspace = true
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-log = "0.4.11"
+log = { version = "0.4.11", features = ["serde", "std"] }
 log4rs = { version = "1.1.1", default-features = false, features = ["all_components", "humantime", "serde", "serde-value", "yaml_format", "gzip"], optional = true }
 once_cell = { version = "1.15.0", default-features = false, optional = true }
-serde = { version = "1.0.145", default-features = false, features = ["derive"] }
+serde = { version = "1.0.145", features = ["derive"] }
 winnow = "0.6.18"
 
 [dependencies.simple-log-derive]
diff --git a/src/inner.rs b/src/inner.rs
index c892387..99016c6 100644
--- a/src/inner.rs
+++ b/src/inner.rs
@@ -87,7 +87,7 @@
 
 use crate::level::{parse_level, LevelInto};
 use crate::out_kind::OutKind;
-use crate::SimpleResult;
+use crate::{InnerLevel, SimpleResult};
 use log::LevelFilter;
 use log4rs::append::console::ConsoleAppender;
 use log4rs::append::rolling_file::policy::compound::roll::fixed_window::FixedWindowRoller;
@@ -241,10 +241,10 @@ pub fn get_log_conf() -> SimpleResult<LogConfig> {
     let config = log_conf.lock().unwrap().log_config.clone();
     Ok(config)
 }
+
 use crate::level::deserialize_level;
 use crate::out_kind::deserialize_out_kind;
 
-pub(crate) type InnerLevel = (LevelFilter, Vec<TargetLevel>);
 #[derive(Debug, Serialize, Deserialize, Clone, PartialEq, Eq)]
 #[serde(rename_all = "snake_case")]
 pub struct LogConfig {
@@ -278,24 +278,6 @@ impl Default for LogConfig {
     }
 }
 
-#[derive(Debug, Serialize, Deserialize, Clone, PartialEq, Eq)]
-pub struct TargetLevel {
-    name: String,
-    level: LevelFilter,
-}
-
-impl<S> From<(S, LevelFilter)> for TargetLevel
-where
-    S: AsRef<str>,
-{
-    fn from(value: (S, LevelFilter)) -> Self {
-        Self {
-            name: value.0.as_ref().to_string(),
-            level: value.1,
-        }
-    }
-}
-
 impl LogConfig {
     fn default_basename(&self) -> String {
         let arg0 = std::env::args()
diff --git a/src/level.rs b/src/level.rs
index a92540a..6bcb7c1 100644
--- a/src/level.rs
+++ b/src/level.rs
@@ -1,4 +1,4 @@
-use crate::inner::InnerLevel;
+use crate::InnerLevel;
 use core::fmt;
 use log::{Level, LevelFilter};
 pub use parser::*;
@@ -6,8 +6,7 @@ use serde::de::DeserializeSeed;
 use serde::{de, Deserializer};
 
 pub(crate) mod parser {
-    use crate::inner::InnerLevel;
-    use crate::TargetLevel;
+    use crate::{InnerLevel, TargetLevel};
     use log::LevelFilter;
     use std::str::FromStr;
     use winnow::ascii::{alpha1, multispace0};
diff --git a/src/lib.rs b/src/lib.rs
index 209d29d..8b9f1a3 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -12,7 +12,28 @@ pub use inner::*;
 
 pub use log::Level;
 pub use log::LevelFilter;
+use serde::{Deserialize, Serialize};
+
 #[cfg(feature = "target")]
 pub use simple_log_derive::*;
 
 pub type SimpleResult<T> = Result<T, String>;
+pub(crate) type InnerLevel = (LevelFilter, Vec<TargetLevel>);
+
+#[derive(Debug, Serialize, Deserialize, Clone, PartialEq, Eq)]
+pub struct TargetLevel {
+    name: String,
+    level: LevelFilter,
+}
+
+impl<S> From<(S, LevelFilter)> for TargetLevel
+where
+    S: AsRef<str>,
+{
+    fn from(value: (S, LevelFilter)) -> Self {
+        Self {
+            name: value.0.as_ref().to_string(),
+            level: value.1,
+        }
+    }
+}
diff --git a/src/out_kind.rs b/src/out_kind.rs
index b417a59..3ea2df4 100644
--- a/src/out_kind.rs
+++ b/src/out_kind.rs
@@ -74,7 +74,7 @@ impl<'de> de::Visitor<'de> for KindSerde {
     }
 }
 
-pub fn deserialize_out_kind<'de, D>(deserializer: D) -> Result<Vec<OutKind>, D::Error>
+pub(crate) fn deserialize_out_kind<'de, D>(deserializer: D) -> Result<Vec<OutKind>, D::Error>
 where
     D: Deserializer<'de>,
 {