diff --git a/.gitignore b/.gitignore
index 5be0788..7cf346d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,5 @@
 /.bundle/
 /.yardoc
-/Gemfile.lock
 /_yardoc/
 /coverage/
 /doc/
diff --git a/Gemfile.lock b/Gemfile.lock
new file mode 100644
index 0000000..f7270b1
--- /dev/null
+++ b/Gemfile.lock
@@ -0,0 +1,142 @@
+PATH
+  remote: .
+  specs:
+    kirico (1.0.5)
+      activemodel (~> 5.2)
+      activesupport (~> 5.2)
+      era_ja
+      validates_timeliness
+      virtus
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    activemodel (5.2.4)
+      activesupport (= 5.2.4)
+    activesupport (5.2.4)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 0.7, < 2)
+      minitest (~> 5.1)
+      tzinfo (~> 1.1)
+    ast (2.4.0)
+    axiom-types (0.1.1)
+      descendants_tracker (~> 0.0.4)
+      ice_nine (~> 0.11.0)
+      thread_safe (~> 0.3, >= 0.3.1)
+    byebug (11.0.1)
+    coderay (1.1.2)
+    coercible (1.0.0)
+      descendants_tracker (~> 0.0.1)
+    concurrent-ruby (1.1.5)
+    descendants_tracker (0.0.4)
+      thread_safe (~> 0.3, >= 0.3.1)
+    diff-lcs (1.3)
+    equalizer (0.0.11)
+    era_ja (1.1.0)
+    factory_bot (5.1.1)
+      activesupport (>= 4.2.0)
+    ffi (1.11.3)
+    formatador (0.2.5)
+    guard (2.16.1)
+      formatador (>= 0.2.4)
+      listen (>= 2.7, < 4.0)
+      lumberjack (>= 1.0.12, < 2.0)
+      nenv (~> 0.1)
+      notiffany (~> 0.0)
+      pry (>= 0.9.12)
+      shellany (~> 0.0)
+      thor (>= 0.18.1)
+    guard-bundler (2.2.1)
+      bundler (>= 1.3.0, < 3)
+      guard (~> 2.2)
+      guard-compat (~> 1.1)
+    guard-compat (1.2.1)
+    guard-rspec (4.7.3)
+      guard (~> 2.1)
+      guard-compat (~> 1.1)
+      rspec (>= 2.99.0, < 4.0)
+    guard-rubocop (1.3.0)
+      guard (~> 2.0)
+      rubocop (~> 0.20)
+    i18n (1.7.0)
+      concurrent-ruby (~> 1.0)
+    ice_nine (0.11.2)
+    jaro_winkler (1.5.4)
+    listen (3.2.1)
+      rb-fsevent (~> 0.10, >= 0.10.3)
+      rb-inotify (~> 0.9, >= 0.9.10)
+    lumberjack (1.0.13)
+    method_source (0.9.2)
+    minitest (5.13.0)
+    nenv (0.3.0)
+    notiffany (0.1.3)
+      nenv (~> 0.1)
+      shellany (~> 0.0)
+    parallel (1.19.1)
+    parser (2.6.5.0)
+      ast (~> 2.4.0)
+    pry (0.12.2)
+      coderay (~> 1.1.0)
+      method_source (~> 0.9.0)
+    pry-byebug (3.7.0)
+      byebug (~> 11.0)
+      pry (~> 0.10)
+    rainbow (3.0.0)
+    rake (10.5.0)
+    rb-fsevent (0.10.3)
+    rb-inotify (0.10.0)
+      ffi (~> 1.0)
+    rspec (3.9.0)
+      rspec-core (~> 3.9.0)
+      rspec-expectations (~> 3.9.0)
+      rspec-mocks (~> 3.9.0)
+    rspec-core (3.9.0)
+      rspec-support (~> 3.9.0)
+    rspec-expectations (3.9.0)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.9.0)
+    rspec-mocks (3.9.0)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.9.0)
+    rspec-support (3.9.0)
+    rubocop (0.77.0)
+      jaro_winkler (~> 1.5.1)
+      parallel (~> 1.10)
+      parser (>= 2.6)
+      rainbow (>= 2.2.2, < 4.0)
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (>= 1.4.0, < 1.7)
+    ruby-progressbar (1.10.1)
+    shellany (0.0.1)
+    thor (0.20.3)
+    thread_safe (0.3.6)
+    timeliness (0.4.3)
+    tzinfo (1.2.5)
+      thread_safe (~> 0.1)
+    unicode-display_width (1.6.0)
+    validates_timeliness (4.1.1)
+      timeliness (>= 0.3.10, < 1)
+    virtus (1.0.5)
+      axiom-types (~> 0.1)
+      coercible (~> 1.0)
+      descendants_tracker (~> 0.0, >= 0.0.3)
+      equalizer (~> 0.0, >= 0.0.9)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  bundler (~> 1.10)
+  factory_bot
+  guard
+  guard-bundler
+  guard-rspec
+  guard-rubocop
+  kirico!
+  pry
+  pry-byebug
+  rake (~> 10.0)
+  rspec
+
+BUNDLED WITH
+   1.17.3
diff --git a/kirico.gemspec b/kirico.gemspec
index daefc5f..533a8fa 100644
--- a/kirico.gemspec
+++ b/kirico.gemspec
@@ -28,8 +28,8 @@ Gem::Specification.new do |spec|
 
   spec.required_ruby_version = '~> 2.5'
 
-  spec.add_dependency 'activemodel'
-  spec.add_dependency 'activesupport'
+  spec.add_dependency 'activemodel', '~> 5.2'
+  spec.add_dependency 'activesupport', '~> 5.2'
   spec.add_dependency 'era_ja'
   spec.add_dependency 'validates_timeliness'
   spec.add_dependency 'virtus'