diff --git a/.mrubycconfig b/.mrubycconfig
index 6449614..c833751 100644
--- a/.mrubycconfig
+++ b/.mrubycconfig
@@ -4,5 +4,3 @@ test_tmp_dir: test/tmp
 mrubyc_src_dir: src
 mrubyc_mrblib_dir: mrblib
 mruby_lib_dir: test
-mruby_version: mruby-2.1.0
-cruby_version: 2.7.0
diff --git a/.ruby-version b/.ruby-version
deleted file mode 100644
index 60dd455..0000000
--- a/.ruby-version
+++ /dev/null
@@ -1 +0,0 @@
-mruby-2.1.0
diff --git a/.travis.yml b/.travis.yml
index deb4c5d..bc262d5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,33 +1,16 @@
-language: c
+language: ruby
 
-arch:
-  - amd64
-  - arm64
-  - ppc64le
+addons:
+  apt:
+    packages:
+      - docker-ce
 
-cache:
-  directories:
-    - /home/travis/.rbenv/
+services:
+  - docker
 
 before_install:
-  - sudo apt update
-  - sudo apt install -y autoconf bison build-essential libssl-dev libyaml-dev libreadline6-dev zlib1g-dev libncurses5-dev libffi-dev libgdbm3 libgdbm-dev
-
-before_script:
-  - "export CRUBY_VERSION=$(ruby -e'puts `grep cruby_version .mrubycconfig`.sub(\"cruby_version: \", \"\")')"
-  - export MRUBY_VERSION=$(grep mruby .ruby-version)
-  - if [ ! -e ~/.rbenv/bin/rbenv ]; then git clone https://github.com/rbenv/rbenv.git ~/.rbenv; fi
-  - if [ ! -e ~/.rbenv/plugins/ruby-build/bin/ruby-build ]; then git clone https://github.com/rbenv/ruby-build.git ~/.rbenv/plugins/ruby-build; fi
-  - cd ~/.rbenv/plugins/ruby-build && git pull && cd -
-  - echo 'export PATH="$HOME/.rbenv/shims:$HOME/.rbenv/bin:$PATH"' >> ~/.bash_profile
-  - source ~/.bash_profile
-  - echo $PATH
-  - rbenv init -
-  - rbenv install --skip-existing $MRUBY_VERSION
-  - rbenv install --skip-existing $CRUBY_VERSION
-  - RBENV_VERSION=$CRUBY_VERSION gem install bundler
-  - RBENV_VERSION=$CRUBY_VERSION bundle install
+  - docker build -t mrubyc/mrubyc-test .
 
 script:
-  - RBENV_VERSION=$CRUBY_VERSION CFLAGS="-DMRBC_USE_MATH=1 -DMAX_SYMBOLS_COUNT=500" bundle exec mrubyc-test --every=100
+  - docker run --mount type=bind,src=${PWD}/,dst=/mrubyc mrubyc/mrubyc-test
 
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..26f8bd4
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,18 @@
+from ruby:2.7.2-slim
+
+RUN apt update && apt -y upgrade
+RUN apt install -y bison make git gcc gcc-arm-linux-gnueabi qemu qemu-kvm qemu-system-arm
+
+RUN gem update --system
+
+RUN git clone https://github.com/mruby/mruby /root/mruby
+ARG MRUBY_TAG
+RUN cd /root/mruby; git checkout $MRUBY_TAG; make
+
+VOLUME /root/mrubyc
+COPY Gemfile /root/mrubyc/
+COPY Gemfile.lock /root/mrubyc/
+WORKDIR /root/mrubyc
+RUN bundle install
+ENV CFLAGS="-DMRBC_USE_MATH=1 -DMAX_SYMBOLS_COUNT=500"
+CMD ["bundle", "exec", "mrubyc-test", "-e", "100", "-p", "/root/mruby/build/host/bin/mrbc"]
diff --git a/Gemfile b/Gemfile
index 95989b2..13224ee 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,3 +1,3 @@
 source "https://rubygems.org"
 
-gem "mrubyc-test", "~> 0.5.3"
+gem "mrubyc-test", "~> 0.6"
diff --git a/Gemfile.lock b/Gemfile.lock
index 008edfa..77e347b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,17 +1,17 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (6.0.3.1)
+    activesupport (6.0.3.4)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
       zeitwerk (~> 2.2, >= 2.2.2)
-    concurrent-ruby (1.1.6)
-    i18n (1.8.2)
+    concurrent-ruby (1.1.7)
+    i18n (1.8.5)
       concurrent-ruby (~> 1.0)
-    minitest (5.14.1)
-    mrubyc-test (0.5.3)
+    minitest (5.14.2)
+    mrubyc-test (0.6.0)
       activesupport (~> 6.0)
       rufo (~> 0.12)
       thor (~> 1.0)
@@ -20,13 +20,13 @@ GEM
     thread_safe (0.3.6)
     tzinfo (1.2.7)
       thread_safe (~> 0.1)
-    zeitwerk (2.3.0)
+    zeitwerk (2.4.0)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  mrubyc-test (~> 0.5.3)
+  mrubyc-test (~> 0.6)
 
 BUNDLED WITH
    2.1.4
diff --git a/Makefile b/Makefile
index dd5f872..8b3efb1 100644
--- a/Makefile
+++ b/Makefile
@@ -7,8 +7,8 @@
 #  This file is distributed under BSD 3-Clause License.
 #
 
-MRUBY_VERSION = `grep mruby_version .mrubycconfig | sed 's/mruby_version: *//'`
-CRUBY_VERSION = `grep cruby_version .mrubycconfig | sed 's/cruby_version: *//'`
+# tag or branch name of mruby/mruby
+MRUBY_TAG = `grep MRUBY_VERSION mrblib/global.rb | sed 's/MRUBY_VERSION *= *"\(.\+\)"/\1/'`
 
 all: mrubyc_lib mrubyc_bin
 
@@ -42,15 +42,8 @@ package: clean
 
 .PHONY: test setup_test
 test:
-	RBENV_VERSION=$(CRUBY_VERSION) \
-	CFLAGS="-DMRBC_USE_MATH=1 -DMAX_SYMBOLS_COUNT=500 $(CFLAGS)" \
-	bundle exec mrubyc-test test --every=100 $(file)
+	docker run --mount type=bind,src=${PWD}/,dst=/root/mrubyc mrubyc/mrubyc-test
 
 setup_test:
-	@echo MRUBY_VERSION=$(MRUBY_VERSION)
-	@echo CRUBY_VERSION=$(CRUBY_VERSION)
-	rbenv install --skip-existing $(MRUBY_VERSION) ;\
-	rbenv local $(MRUBY_VERSION) ;\
-	rbenv install --skip-existing $(CRUBY_VERSION) ;\
-	RBENV_VERSION=$(CRUBY_VERSION) gem install bundler ;\
-	RBENV_VERSION=$(CRUBY_VERSION) bundle install
+	@echo MRUBY_TAG=$(MRUBY_TAG)
+	docker build -t mrubyc/mrubyc-test --build-arg MRUBY_TAG=$(MRUBY_TAG) .
diff --git a/mrblib/global.rb b/mrblib/global.rb
index 13d38e2..f7ba4f2 100644
--- a/mrblib/global.rb
+++ b/mrblib/global.rb
@@ -8,4 +8,5 @@
 #
 
 RUBY_VERSION = "1.9"
+MRUBY_VERSION = "2.1.1"
 MRUBYC_VERSION = "2.1"
diff --git a/test/tmp/.ruby-version b/test/tmp/.ruby-version
deleted file mode 100644
index ec1cf33..0000000
--- a/test/tmp/.ruby-version
+++ /dev/null
@@ -1 +0,0 @@
-2.6.3