diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3ba59a02..8807f21d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,8 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/) a
 
 ## [Unreleased]
 
+## [0.12.3] - 2019-05-16
+
 ### Changed
 
 - [INTERNAL] Move arg, assign, constant, flow, massign, operator, scope, and statement nodes into their own files.
@@ -379,7 +381,8 @@ would previously result in `array[]`, but now prints properly. (Thanks to @xipgr
 
 - Initial release 🎉
 
-[unreleased]: https://github.com/prettier/plugin-ruby/compare/v0.12.2...HEAD
+[unreleased]: https://github.com/prettier/plugin-ruby/compare/v0.12.3...HEAD
+[0.12.3]: https://github.com/prettier/plugin-ruby/compare/v0.12.2...v0.12.3
 [0.12.2]: https://github.com/prettier/plugin-ruby/compare/v0.12.1...v0.12.2
 [0.12.1]: https://github.com/prettier/plugin-ruby/compare/v0.12.0...v0.12.1
 [0.12.0]: https://github.com/prettier/plugin-ruby/compare/v0.11.0...v0.12.0
diff --git a/Gemfile b/Gemfile
index 4b61218b..7f4f5e95 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,7 +2,4 @@
 
 source 'https://rubygems.org'
 
-gem 'minitest'
-gem 'rubocop'
-
 gemspec
diff --git a/Gemfile.lock b/Gemfile.lock
index 4886a6f1..8628bab6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    prettier (0.12.2)
+    prettier (0.12.3)
 
 GEM
   remote: https://rubygems.org/
@@ -31,10 +31,10 @@ PLATFORMS
 
 DEPENDENCIES
   bundler (~> 2.0)
-  minitest
+  minitest (~> 5.11)
   prettier!
   rake (~> 12.3)
-  rubocop
+  rubocop (~> 0.67)
 
 BUNDLED WITH
    2.0.1
diff --git a/package.json b/package.json
index e7ecd575..bd9ad3a0 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@prettier/plugin-ruby",
-  "version": "0.12.2",
+  "version": "0.12.3",
   "description": "prettier plugin for the Ruby programming language",
   "main": "src/ruby.js",
   "scripts": {
@@ -26,7 +26,7 @@
     "all-contributors-cli": "^6.1.2",
     "eslint": "^5.15.0",
     "eslint-config-airbnb-base": "^13.1.0",
-    "eslint-config-prettier": "^4.1.0",
+    "eslint-config-prettier": "^4.3.0",
     "eslint-plugin-import": "^2.16.0",
     "jest": "^24.0.0"
   },
diff --git a/prettier.gemspec b/prettier.gemspec
index b48e7132..ff39d841 100644
--- a/prettier.gemspec
+++ b/prettier.gemspec
@@ -30,5 +30,7 @@ Gem::Specification.new do |spec|
   spec.require_paths = %w[lib]
 
   spec.add_development_dependency 'bundler', '~> 2.0'
+  spec.add_development_dependency 'minitest', '~> 5.11'
   spec.add_development_dependency 'rake', '~> 12.3'
+  spec.add_development_dependency 'rubocop', '~> 0.67'
 end
diff --git a/yarn.lock b/yarn.lock
index ee1fb781..7b681e8b 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1079,10 +1079,10 @@ eslint-config-airbnb-base@^13.1.0:
     object.assign "^4.1.0"
     object.entries "^1.0.4"
 
-eslint-config-prettier@^4.1.0:
-  version "4.2.0"
-  resolved "https://registry.yarnpkg.com/eslint-config-prettier/-/eslint-config-prettier-4.2.0.tgz#70b946b629cd0e3e98233fd9ecde4cb9778de96c"
-  integrity sha512-y0uWc/FRfrHhpPZCYflWC8aE0KRJRY04rdZVfl8cL3sEZmOYyaBdhdlQPjKZBnuRMyLVK+JUZr7HaZFClQiH4w==
+eslint-config-prettier@^4.3.0:
+  version "4.3.0"
+  resolved "https://registry.yarnpkg.com/eslint-config-prettier/-/eslint-config-prettier-4.3.0.tgz#c55c1fcac8ce4518aeb77906984e134d9eb5a4f0"
+  integrity sha512-sZwhSTHVVz78+kYD3t5pCWSYEdVSBR0PXnwjDRsUs8ytIrK8PLXw+6FKp8r3Z7rx4ZszdetWlXYKOHoUrrwPlA==
   dependencies:
     get-stdin "^6.0.0"