diff --git a/CHANGELOG.md b/CHANGELOG.md
index 61c69e53..66922a5c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,8 @@
 ## Unreleased
 
+## 4.0.0
+
+### Enhancements
 * Add bootstrap v4.1 generator template. [@m5o](https://github.com/m5o)
 * Add Rails 5.2 support. [@gobijan](https://github.com/gobijan)
 * Add API to register custom components.[@feliperenan](https://github.com/feliperenan)
diff --git a/Gemfile.lock b/Gemfile.lock
index 5845edfc..8940345d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    simple_form (3.5.1)
+    simple_form (4.0.0)
       actionpack (> 4)
       activemodel (> 4)
 
diff --git a/lib/simple_form/version.rb b/lib/simple_form/version.rb
index 9bbbab94..7c5d182b 100644
--- a/lib/simple_form/version.rb
+++ b/lib/simple_form/version.rb
@@ -1,4 +1,4 @@
 # frozen_string_literal: true
 module SimpleForm
-  VERSION = "3.5.1".freeze
+  VERSION = "4.0.0".freeze
 end