diff --git a/CHANGELOG.md b/CHANGELOG.md
index 75771be..54b5f09 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,7 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
-### Added
+## [1.0.0] - 2021-04-23
+
+### Changed
 
 - README updated
 - Small documentation clarification [@smnscp](https://github.com/smnscp).
@@ -23,5 +25,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - fix `required_ruby_version` for Ruby 3 support
 
-[unreleased]: https://github.com/whomwah/rqrcode_core/compare/v0.2.0...HEAD
+[unreleased]: https://github.com/whomwah/rqrcode_core/compare/v1.0.0...HEAD
+[1.0.0]: https://github.com/whomwah/rqrcode_core/compare/v0.2.0...v1.0.0
 [0.2.0]: https://github.com/whomwah/rqrcode_core/compare/v0.1.2...v0.2.0
diff --git a/Gemfile.lock b/Gemfile.lock
index ad1089c..012ade9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,21 +1,21 @@
 PATH
   remote: .
   specs:
-    rqrcode_core (0.2.0)
+    rqrcode_core (1.0.0)
 
 GEM
   remote: https://rubygems.org/
   specs:
     ast (2.4.2)
-    minitest (5.11.3)
+    minitest (5.14.4)
     parallel (1.20.1)
-    parser (3.0.0.0)
+    parser (3.0.1.0)
       ast (~> 2.4.1)
     rainbow (3.0.0)
-    rake (13.0.1)
+    rake (13.0.3)
     regexp_parser (2.1.1)
-    rexml (3.2.4)
-    rubocop (1.11.0)
+    rexml (3.2.5)
+    rubocop (1.12.1)
       parallel (~> 1.10)
       parser (>= 3.0.0.0)
       rainbow (>= 2.2.2, < 4.0)
@@ -30,8 +30,8 @@ GEM
       rubocop (>= 0.90.0, < 2.0)
       rubocop-ast (>= 0.4.0)
     ruby-progressbar (1.11.0)
-    standard (1.0.4)
-      rubocop (= 1.11.0)
+    standard (1.0.5)
+      rubocop (= 1.12.1)
       rubocop-performance (= 1.10.1)
     standardrb (1.0.0)
       standard
@@ -41,11 +41,11 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  bundler (>= 2.0)
+  bundler (~> 2.0)
   minitest (~> 5.0)
   rake (~> 13.0)
   rqrcode_core!
   standardrb (~> 1.0)
 
 BUNDLED WITH
-   2.2.3
+   2.2.15
diff --git a/lib/rqrcode_core/version.rb b/lib/rqrcode_core/version.rb
index 45eb5eb..7ca9744 100644
--- a/lib/rqrcode_core/version.rb
+++ b/lib/rqrcode_core/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module RQRCodeCore
-  VERSION = "0.2.0"
+  VERSION = "1.0.0"
 end
diff --git a/rqrcode_core.gemspec b/rqrcode_core.gemspec
index 7dbfd69..08d9057 100644
--- a/rqrcode_core.gemspec
+++ b/rqrcode_core.gemspec
@@ -25,7 +25,7 @@ Gem::Specification.new do |spec|
   spec.require_paths = ["lib"]
 
   spec.required_ruby_version = ">= 2.3"
-  spec.add_development_dependency "bundler", ">= 2.0"
+  spec.add_development_dependency "bundler", "~> 2.0"
   spec.add_development_dependency "rake", "~> 13.0"
   spec.add_development_dependency "minitest", "~> 5.0"
   spec.add_development_dependency "standardrb", "~> 1.0"