diff --git a/CHANGELOG.md b/CHANGELOG.md
index 51344ed..04dfd9e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,4 @@
-## [x.y.z](https://github.com/sushichop/Puppy/releases/tag/x.y.z) (yyyy-mm-dd)
+## [0.4.0](https://github.com/sushichop/Puppy/releases/tag/0.4.0) (2022-01-31)
 
 - `FileRotatonLogger` inherits `FileLogger`. [#29](https://github.com/sushichop/Puppy/pull/29)
 - Add asynchronous methods for `delete` and `flush`. [#30](https://github.com/sushichop/Puppy/pull/30)
diff --git a/Configurations/Common.xcconfig b/Configurations/Common.xcconfig
index 6d8e448..73b9a4a 100644
--- a/Configurations/Common.xcconfig
+++ b/Configurations/Common.xcconfig
@@ -19,7 +19,7 @@ WATCHOS_DEPLOYMENT_TARGET = 3.0
 
 SWIFT_VERSION = 5.0
 
-MARKETING_VERSION = 0.3.1
+MARKETING_VERSION = 0.4.0
 DYLIB_CURRENT_VERSION = 1
 CURRENT_PROJECT_VERSION = $(DYLIB_CURRENT_VERSION)
 
diff --git a/Puppy.podspec b/Puppy.podspec
index 19b401b..b37129d 100644
--- a/Puppy.podspec
+++ b/Puppy.podspec
@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name              = "Puppy"
-  s.version           = "0.3.1"
+  s.version           = "0.4.0"
   s.summary           = "A flexible logging library written in Swift"
   s.homepage          = "https://github.com/sushichop/Puppy"
   s.license           = { :type => "MIT", :file => "LICENSE" }