diff --git a/README.md b/README.md
index fef9892..1722326 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,5 @@
 # Shiyo
-[![johnny-miyake](https://circleci.com/gh/johnny-miyake/shiyo.svg?style=svg)](https://github.com/johnny-miyake/shiyo)
+[![j-miyake](https://circleci.com/gh/j-miyake/shiyo.svg?style=svg)](https://github.com/j-miyake/shiyo)
 
 Shiyo is a minimal framework that supports writing your business rules using the [Specification pattern](https://en.wikipedia.org/wiki/Specification_pattern).
 It helps you to build a composite specification by method chaining like;
@@ -116,7 +116,7 @@ To install this gem onto your local machine, run `bundle exec rake install`. To
 
 ## Contributing
 
-Bug reports and pull requests are welcome on GitHub at https://github.com/johnny-miyake/shiyo. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the [code of conduct](https://github.com/johnny-miyake/shiyo/blob/master/CODE_OF_CONDUCT.md).
+Bug reports and pull requests are welcome on GitHub at https://github.com/j-miyake/shiyo. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the [code of conduct](https://github.com/j-miyake/shiyo/blob/master/CODE_OF_CONDUCT.md).
 
 ## License
 
@@ -124,4 +124,4 @@ The gem is available as open source under the terms of the [MIT License](https:/
 
 ## Code of Conduct
 
-Everyone interacting in the Shiyo project's codebases, issue trackers, chat rooms and mailing lists is expected to follow the [code of conduct](https://github.com/johnny-miyake/shiyo/blob/master/CODE_OF_CONDUCT.md).
+Everyone interacting in the Shiyo project's codebases, issue trackers, chat rooms and mailing lists is expected to follow the [code of conduct](https://github.com/j-miyake/shiyo/blob/master/CODE_OF_CONDUCT.md).
diff --git a/shiyo.gemspec b/shiyo.gemspec
index 6403591..d0ffea4 100644
--- a/shiyo.gemspec
+++ b/shiyo.gemspec
@@ -12,12 +12,12 @@ Gem::Specification.new do |spec|
   spec.description = <<-DESCRIPTION
     Shiyo is a minimal framework that supports writing your business rules using the Specification pattern.
   DESCRIPTION
-  spec.homepage = "https://github.com/johnny-miyake/shiyo"
+  spec.homepage = "https://github.com/j-miyake/shiyo"
   spec.license = "MIT"
   spec.required_ruby_version = ">= 2.6.0"
   spec.metadata["homepage_uri"] = spec.homepage
-  spec.metadata["source_code_uri"] = "https://github.com/johnny-miyake/shiyo"
-  spec.metadata["changelog_uri"] = "https://github.com/johnny-miyake/shiyo/blob/master/CHANGELOG.md"
+  spec.metadata["source_code_uri"] = "https://github.com/j-miyake/shiyo"
+  spec.metadata["changelog_uri"] = "https://github.com/j-miyake/shiyo/blob/master/CHANGELOG.md"
 
   # Specify which files should be added to the gem when it is released.
   # The `git ls-files -z` loads the files in the RubyGem that have been added into git.