diff --git a/mrbgems/mruby-set/.gitignore b/mrbgems/mruby-set/.gitignore
deleted file mode 100644
index b349187b5..000000000
--- a/mrbgems/mruby-set/.gitignore
+++ /dev/null
@@ -1 +0,0 @@
-/mruby/
diff --git a/mrbgems/mruby-set/.travis.yml b/mrbgems/mruby-set/.travis.yml
deleted file mode 100644
index e438907a6..000000000
--- a/mrbgems/mruby-set/.travis.yml
+++ /dev/null
@@ -1,14 +0,0 @@
-sudo: false
-addons:
-  apt:
-    packages:
-      - rake
-      - bison
-      - git
-      - gperf
-language: c
-compiler:
-  - gcc
-  - clang
-script:
-  - rake test
diff --git a/mrbgems/mruby-set/Rakefile b/mrbgems/mruby-set/Rakefile
deleted file mode 100644
index af775b8af..000000000
--- a/mrbgems/mruby-set/Rakefile
+++ /dev/null
@@ -1,22 +0,0 @@
-MRUBY_CONFIG = File.expand_path(ENV["MRUBY_CONFIG"] || "build_config.rb")
-
-file :mruby do
-  sh "git clone --depth=1 git://github.com/mruby/mruby.git"
-end
-
-desc "compile binary"
-task :compile => :mruby do
-  sh "cd mruby && MRUBY_CONFIG=#{MRUBY_CONFIG} rake all"
-end
-
-desc "test"
-task :test => :mruby do
-  sh "cd mruby && MRUBY_CONFIG=#{MRUBY_CONFIG} rake all test"
-end
-
-desc "cleanup"
-task :clean do
-  sh "cd mruby && rake deep_clean"
-end
-
-task :default => :test
diff --git a/mrbgems/mruby-set/build_config.rb b/mrbgems/mruby-set/build_config.rb
deleted file mode 100644
index 9568b5c71..000000000
--- a/mrbgems/mruby-set/build_config.rb
+++ /dev/null
@@ -1,6 +0,0 @@
-MRuby::Build.new do |conf|
-  toolchain :gcc
-  conf.gembox 'default'
-  conf.gem '../mruby-set'
-  conf.enable_test
-end