diff --git a/CHANGELOG.md b/CHANGELOG.md
index 02df4a15..d7a4bcc8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,11 +1,5 @@
 # Change Log
 
-## next
-
-### Fixed
-
-* removed outdated dependency `derivative`
-
 ## [1.3.0]
 
 ### New
diff --git a/src/append/file.rs b/src/append/file.rs
index f4826f94..5dbcf016 100644
--- a/src/append/file.rs
+++ b/src/append/file.rs
@@ -5,8 +5,8 @@
 use log::Record;
 use parking_lot::Mutex;
 use std::{
-    fs::{self, File, OpenOptions},
     fmt::{Debug, Formatter},
+    fs::{self, File, OpenOptions},
     io::{self, BufWriter, Write},
     path::{Path, PathBuf},
 };
diff --git a/src/append/rolling_file/mod.rs b/src/append/rolling_file/mod.rs
index 302c270c..6c7f0274 100644
--- a/src/append/rolling_file/mod.rs
+++ b/src/append/rolling_file/mod.rs
@@ -19,8 +19,8 @@
 use log::Record;
 use parking_lot::Mutex;
 use std::{
-    fs::{self, File, OpenOptions},
     fmt::{Debug, Formatter},
+    fs::{self, File, OpenOptions},
     io::{self, BufWriter, Write},
     path::{Path, PathBuf},
 };
diff --git a/src/config/raw.rs b/src/config/raw.rs
index c5494f3e..955c7528 100644
--- a/src/config/raw.rs
+++ b/src/config/raw.rs
@@ -442,7 +442,7 @@ struct Root {
 
 impl Default for Root {
     fn default() -> Self {
-        Self{
+        Self {
             level: root_level_default(),
             appenders: vec![],
         }
diff --git a/src/encode/pattern/mod.rs b/src/encode/pattern/mod.rs
index 45d6e45b..09e6deb1 100644
--- a/src/encode/pattern/mod.rs
+++ b/src/encode/pattern/mod.rs
@@ -123,7 +123,11 @@
 
 use chrono::{Local, Utc};
 use log::{Level, Record};
-use std::{default::Default, io, process, thread, fmt::{Debug, Formatter}};
+use std::{
+    default::Default,
+    fmt::{Debug, Formatter},
+    io, process, thread,
+};
 
 use crate::encode::{
     self,