diff --git a/.circleci/config.yml b/.circleci/config.yml
index d66e96b..e0126a2 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -3,14 +3,14 @@ version: 2
 references:
 
   ruby_image: &ruby_image
-    circleci/ruby:2.3.3
+    cimg/ruby:2.7.7
 
   mysql_container_config: &mysql_container_config
     docker:
       - image: *ruby_image
         environment:
           DB_HOST=127.0.0.1
-      - image: circleci/mysql:5.6.39
+      - image: cimg/mysql:5.7.36
         environment:
           MYSQL_DATABASE=immortal_db
 
@@ -18,13 +18,6 @@ references:
     docker:
       - image: *ruby_image
 
-  install_bundler: &install_bundler
-    run:
-      name: Install Bundler
-      command: |
-        gem install bundler
-        gem cleanup bundler
-
   install_gems: &install_gems
     run:
       name: Install Gems
@@ -48,7 +41,6 @@ jobs:
       - DB_PORT=3306
     steps:
       - checkout
-      - *install_bundler
       - *install_gems
       - *appraisal_install
       - *appraisal_rspec
@@ -56,7 +48,6 @@ jobs:
     <<: *sqlite_container_config
     steps:
       - checkout
-      - *install_bundler
       - *install_gems
       - *appraisal_install
       - *appraisal_rspec
diff --git a/.ruby-version b/.ruby-version
index 0bee604..1f7da99 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-2.3.3
+2.7.7
diff --git a/Appraisals b/Appraisals
index 04e6e6f..fb0e592 100644
--- a/Appraisals
+++ b/Appraisals
@@ -1,14 +1,14 @@
-appraise 'activerecord-41' do
-  gem 'activerecord', '~> 4.1.0'
-  gem 'mysql2', '0.3.20' if ENV['CONFIG_MYSQL']
+appraise 'activerecord-50' do
+  gem 'activerecord', '~> 5.0.0'
+  gem 'mysql2' if ENV['CONFIG_MYSQL']
 end
 
-appraise 'activerecord-42' do
-  gem 'activerecord', '~> 4.2.0'
-  gem 'mysql2', '~> 0.4.0' if ENV['CONFIG_MYSQL']
+appraise 'activerecord-51' do
+  gem 'activerecord', '~> 5.1.0'
+  gem 'mysql2' if ENV['CONFIG_MYSQL']
 end
 
-appraise 'activerecord-50' do
-  gem 'activerecord', '~> 5.0.0'
-  gem 'mysql2', '~> 0.5.0' if ENV['CONFIG_MYSQL']
+appraise 'activerecord-52' do
+  gem 'activerecord', '~> 5.2.0'
+  gem 'mysql2' if ENV['CONFIG_MYSQL']
 end
diff --git a/gemfiles/activerecord_41.gemfile.lock b/gemfiles/activerecord_41.gemfile.lock
deleted file mode 100644
index d01be24..0000000
--- a/gemfiles/activerecord_41.gemfile.lock
+++ /dev/null
@@ -1,120 +0,0 @@
-PATH
-  remote: ..
-  specs:
-    immortal (3.0.0)
-      activerecord (>= 4.1.0, < 5.1)
-
-GEM
-  remote: http://rubygems.org/
-  specs:
-    activemodel (4.1.16)
-      activesupport (= 4.1.16)
-      builder (~> 3.1)
-    activerecord (4.1.16)
-      activemodel (= 4.1.16)
-      activesupport (= 4.1.16)
-      arel (~> 5.0.0)
-    activesupport (4.1.16)
-      i18n (~> 0.6, >= 0.6.9)
-      json (~> 1.7, >= 1.7.7)
-      minitest (~> 5.1)
-      thread_safe (~> 0.1)
-      tzinfo (~> 1.1)
-    appraisal (2.2.0)
-      bundler
-      rake
-      thor (>= 0.14.0)
-    arel (5.0.1.20140414130214)
-    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)
-    builder (3.2.3)
-    byebug (10.0.2)
-    codeclimate-engine-rb (0.4.1)
-      virtus (~> 1.0)
-    coercible (1.0.0)
-      descendants_tracker (~> 0.0.1)
-    concurrent-ruby (1.1.3)
-    descendants_tracker (0.0.4)
-      thread_safe (~> 0.3, >= 0.3.1)
-    diff-lcs (1.3)
-    equalizer (0.0.11)
-    i18n (0.9.5)
-      concurrent-ruby (~> 1.0)
-    ice_nine (0.11.2)
-    jaro_winkler (1.5.1)
-    json (1.8.6)
-    kwalify (0.7.2)
-    minitest (5.11.3)
-    mysql2 (0.3.20)
-    parallel (1.12.1)
-    parser (2.5.3.0)
-      ast (~> 2.4.0)
-    powerpack (0.1.2)
-    rainbow (3.0.0)
-    rake (10.5.0)
-    reek (5.2.0)
-      codeclimate-engine-rb (~> 0.4.0)
-      kwalify (~> 0.7.0)
-      parser (>= 2.5.0.0, < 2.6, != 2.5.1.1)
-      rainbow (>= 2.0, < 4.0)
-    rspec (3.6.0)
-      rspec-core (~> 3.6.0)
-      rspec-expectations (~> 3.6.0)
-      rspec-mocks (~> 3.6.0)
-    rspec-core (3.6.0)
-      rspec-support (~> 3.6.0)
-    rspec-expectations (3.6.0)
-      diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.6.0)
-    rspec-its (1.2.0)
-      rspec-core (>= 3.0.0)
-      rspec-expectations (>= 3.0.0)
-    rspec-mocks (3.6.0)
-      diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.6.0)
-    rspec-support (3.6.0)
-    rubocop (0.60.0)
-      jaro_winkler (~> 1.5.1)
-      parallel (~> 1.10)
-      parser (>= 2.5, != 2.5.1.1)
-      powerpack (~> 0.1)
-      rainbow (>= 2.2.2, < 4.0)
-      ruby-progressbar (~> 1.7)
-      unicode-display_width (~> 1.4.0)
-    rubocop-rspec (1.30.1)
-      rubocop (>= 0.60.0)
-    ruby-progressbar (1.10.0)
-    sqlite3 (1.3.13)
-    thor (0.20.3)
-    thread_safe (0.3.6)
-    tzinfo (1.2.5)
-      thread_safe (~> 0.1)
-    unicode-display_width (1.4.0)
-    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
-  activerecord (~> 4.1.0)
-  appraisal
-  byebug
-  immortal!
-  mysql2 (= 0.3.20)
-  rake (~> 10.0)
-  reek
-  rspec (~> 3.6.0)
-  rspec-its
-  rubocop
-  rubocop-rspec
-  sqlite3
-
-BUNDLED WITH
-   1.16.5
diff --git a/gemfiles/activerecord_42.gemfile.lock b/gemfiles/activerecord_42.gemfile.lock
deleted file mode 100644
index 4ce5b6a..0000000
--- a/gemfiles/activerecord_42.gemfile.lock
+++ /dev/null
@@ -1,118 +0,0 @@
-PATH
-  remote: ..
-  specs:
-    immortal (3.0.0)
-      activerecord (>= 4.1.0, < 5.1)
-
-GEM
-  remote: http://rubygems.org/
-  specs:
-    activemodel (4.2.11)
-      activesupport (= 4.2.11)
-      builder (~> 3.1)
-    activerecord (4.2.11)
-      activemodel (= 4.2.11)
-      activesupport (= 4.2.11)
-      arel (~> 6.0)
-    activesupport (4.2.11)
-      i18n (~> 0.7)
-      minitest (~> 5.1)
-      thread_safe (~> 0.3, >= 0.3.4)
-      tzinfo (~> 1.1)
-    appraisal (2.2.0)
-      bundler
-      rake
-      thor (>= 0.14.0)
-    arel (6.0.4)
-    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)
-    builder (3.2.3)
-    byebug (10.0.2)
-    codeclimate-engine-rb (0.4.1)
-      virtus (~> 1.0)
-    coercible (1.0.0)
-      descendants_tracker (~> 0.0.1)
-    concurrent-ruby (1.1.3)
-    descendants_tracker (0.0.4)
-      thread_safe (~> 0.3, >= 0.3.1)
-    diff-lcs (1.3)
-    equalizer (0.0.11)
-    i18n (0.9.5)
-      concurrent-ruby (~> 1.0)
-    ice_nine (0.11.2)
-    jaro_winkler (1.5.1)
-    kwalify (0.7.2)
-    minitest (5.11.3)
-    mysql2 (0.4.10)
-    parallel (1.12.1)
-    parser (2.5.3.0)
-      ast (~> 2.4.0)
-    powerpack (0.1.2)
-    rainbow (3.0.0)
-    rake (10.5.0)
-    reek (5.2.0)
-      codeclimate-engine-rb (~> 0.4.0)
-      kwalify (~> 0.7.0)
-      parser (>= 2.5.0.0, < 2.6, != 2.5.1.1)
-      rainbow (>= 2.0, < 4.0)
-    rspec (3.6.0)
-      rspec-core (~> 3.6.0)
-      rspec-expectations (~> 3.6.0)
-      rspec-mocks (~> 3.6.0)
-    rspec-core (3.6.0)
-      rspec-support (~> 3.6.0)
-    rspec-expectations (3.6.0)
-      diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.6.0)
-    rspec-its (1.2.0)
-      rspec-core (>= 3.0.0)
-      rspec-expectations (>= 3.0.0)
-    rspec-mocks (3.6.0)
-      diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.6.0)
-    rspec-support (3.6.0)
-    rubocop (0.60.0)
-      jaro_winkler (~> 1.5.1)
-      parallel (~> 1.10)
-      parser (>= 2.5, != 2.5.1.1)
-      powerpack (~> 0.1)
-      rainbow (>= 2.2.2, < 4.0)
-      ruby-progressbar (~> 1.7)
-      unicode-display_width (~> 1.4.0)
-    rubocop-rspec (1.30.1)
-      rubocop (>= 0.60.0)
-    ruby-progressbar (1.10.0)
-    sqlite3 (1.3.13)
-    thor (0.20.3)
-    thread_safe (0.3.6)
-    tzinfo (1.2.5)
-      thread_safe (~> 0.1)
-    unicode-display_width (1.4.0)
-    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
-  activerecord (~> 4.2.0)
-  appraisal
-  byebug
-  immortal!
-  mysql2 (~> 0.4.0)
-  rake (~> 10.0)
-  reek
-  rspec (~> 3.6.0)
-  rspec-its
-  rubocop
-  rubocop-rspec
-  sqlite3
-
-BUNDLED WITH
-   1.16.5
diff --git a/gemfiles/activerecord_50.gemfile b/gemfiles/activerecord_50.gemfile
index ee48d14..5587c46 100644
--- a/gemfiles/activerecord_50.gemfile
+++ b/gemfiles/activerecord_50.gemfile
@@ -3,6 +3,6 @@
 source "http://rubygems.org"
 
 gem "activerecord", "~> 5.0.0"
-gem "mysql2", "~> 0.5.0"
+gem "mysql2"
 
 gemspec path: "../"
diff --git a/gemfiles/activerecord_50.gemfile.lock b/gemfiles/activerecord_50.gemfile.lock
index 3d49a1e..ce65d1e 100644
--- a/gemfiles/activerecord_50.gemfile.lock
+++ b/gemfiles/activerecord_50.gemfile.lock
@@ -1,61 +1,52 @@
 PATH
   remote: ..
   specs:
-    immortal (3.0.0)
-      activerecord (>= 4.1.0, < 5.1)
+    immortal (3.1.0)
+      activerecord (>= 4.1.0, < 6.0)
 
 GEM
   remote: http://rubygems.org/
   specs:
-    activemodel (5.0.7)
-      activesupport (= 5.0.7)
-    activerecord (5.0.7)
-      activemodel (= 5.0.7)
-      activesupport (= 5.0.7)
+    activemodel (5.0.7.2)
+      activesupport (= 5.0.7.2)
+    activerecord (5.0.7.2)
+      activemodel (= 5.0.7.2)
+      activesupport (= 5.0.7.2)
       arel (~> 7.0)
-    activesupport (5.0.7)
+    activesupport (5.0.7.2)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
-    appraisal (2.2.0)
+    appraisal (2.5.0)
       bundler
       rake
       thor (>= 0.14.0)
     arel (7.1.4)
-    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 (10.0.2)
-    codeclimate-engine-rb (0.4.1)
-      virtus (~> 1.0)
-    coercible (1.0.0)
-      descendants_tracker (~> 0.0.1)
-    concurrent-ruby (1.1.3)
-    descendants_tracker (0.0.4)
-      thread_safe (~> 0.3, >= 0.3.1)
-    diff-lcs (1.3)
-    equalizer (0.0.11)
-    i18n (1.1.1)
+    ast (2.4.2)
+    byebug (11.1.3)
+    concurrent-ruby (1.2.3)
+    diff-lcs (1.5.1)
+    i18n (1.14.4)
       concurrent-ruby (~> 1.0)
-    ice_nine (0.11.2)
-    jaro_winkler (1.5.1)
+    json (2.7.2)
     kwalify (0.7.2)
-    minitest (5.11.3)
-    mysql2 (0.5.2)
-    parallel (1.12.1)
-    parser (2.5.3.0)
-      ast (~> 2.4.0)
-    powerpack (0.1.2)
-    rainbow (3.0.0)
+    language_server-protocol (3.17.0.3)
+    minitest (5.22.3)
+    mysql2 (0.5.6)
+    parallel (1.24.0)
+    parser (3.2.2.4)
+      ast (~> 2.4.1)
+      racc
+    racc (1.7.3)
+    rainbow (3.1.1)
     rake (10.5.0)
-    reek (5.2.0)
-      codeclimate-engine-rb (~> 0.4.0)
+    reek (6.1.4)
       kwalify (~> 0.7.0)
-      parser (>= 2.5.0.0, < 2.6, != 2.5.1.1)
+      parser (~> 3.2.0)
       rainbow (>= 2.0, < 4.0)
+    regexp_parser (2.9.0)
+    rexml (3.2.6)
     rspec (3.6.0)
       rspec-core (~> 3.6.0)
       rspec-expectations (~> 3.6.0)
@@ -65,35 +56,43 @@ GEM
     rspec-expectations (3.6.0)
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.6.0)
-    rspec-its (1.2.0)
+    rspec-its (1.3.0)
       rspec-core (>= 3.0.0)
       rspec-expectations (>= 3.0.0)
     rspec-mocks (3.6.0)
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.6.0)
     rspec-support (3.6.0)
-    rubocop (0.60.0)
-      jaro_winkler (~> 1.5.1)
+    rubocop (1.59.0)
+      json (~> 2.3)
+      language_server-protocol (>= 3.17.0)
       parallel (~> 1.10)
-      parser (>= 2.5, != 2.5.1.1)
-      powerpack (~> 0.1)
+      parser (>= 3.2.2.4)
       rainbow (>= 2.2.2, < 4.0)
+      regexp_parser (>= 1.8, < 3.0)
+      rexml (>= 3.2.5, < 4.0)
+      rubocop-ast (>= 1.30.0, < 2.0)
       ruby-progressbar (~> 1.7)
-      unicode-display_width (~> 1.4.0)
-    rubocop-rspec (1.30.1)
-      rubocop (>= 0.60.0)
-    ruby-progressbar (1.10.0)
-    sqlite3 (1.3.13)
-    thor (0.20.3)
+      unicode-display_width (>= 2.4.0, < 3.0)
+    rubocop-ast (1.30.0)
+      parser (>= 3.2.1.0)
+    rubocop-capybara (2.20.0)
+      rubocop (~> 1.41)
+    rubocop-factory_bot (2.25.1)
+      rubocop (~> 1.41)
+    rubocop-rspec (2.29.1)
+      rubocop (~> 1.40)
+      rubocop-capybara (~> 2.17)
+      rubocop-factory_bot (~> 2.22)
+      rubocop-rspec_rails (~> 2.28)
+    rubocop-rspec_rails (2.28.2)
+      rubocop (~> 1.40)
+    ruby-progressbar (1.13.0)
+    thor (1.3.1)
     thread_safe (0.3.6)
-    tzinfo (1.2.5)
+    tzinfo (1.2.11)
       thread_safe (~> 0.1)
-    unicode-display_width (1.4.0)
-    virtus (1.0.5)
-      axiom-types (~> 0.1)
-      coercible (~> 1.0)
-      descendants_tracker (~> 0.0, >= 0.0.3)
-      equalizer (~> 0.0, >= 0.0.9)
+    unicode-display_width (2.5.0)
 
 PLATFORMS
   ruby
@@ -103,14 +102,13 @@ DEPENDENCIES
   appraisal
   byebug
   immortal!
-  mysql2 (~> 0.5.0)
+  mysql2
   rake (~> 10.0)
   reek
   rspec (~> 3.6.0)
   rspec-its
   rubocop
   rubocop-rspec
-  sqlite3
 
 BUNDLED WITH
-   1.16.5
+   2.1.4
diff --git a/gemfiles/activerecord_41.gemfile b/gemfiles/activerecord_51.gemfile
similarity index 62%
rename from gemfiles/activerecord_41.gemfile
rename to gemfiles/activerecord_51.gemfile
index 7fcf1e6..b0412b6 100644
--- a/gemfiles/activerecord_41.gemfile
+++ b/gemfiles/activerecord_51.gemfile
@@ -2,7 +2,7 @@
 
 source "http://rubygems.org"
 
-gem "activerecord", "~> 4.1.0"
-gem "mysql2", "0.3.20"
+gem "activerecord", "~> 5.1.0"
+gem "mysql2"
 
 gemspec path: "../"
diff --git a/gemfiles/activerecord_51.gemfile.lock b/gemfiles/activerecord_51.gemfile.lock
new file mode 100644
index 0000000..de0617d
--- /dev/null
+++ b/gemfiles/activerecord_51.gemfile.lock
@@ -0,0 +1,114 @@
+PATH
+  remote: ..
+  specs:
+    immortal (3.1.0)
+      activerecord (>= 4.1.0, < 6.0)
+
+GEM
+  remote: http://rubygems.org/
+  specs:
+    activemodel (5.1.7)
+      activesupport (= 5.1.7)
+    activerecord (5.1.7)
+      activemodel (= 5.1.7)
+      activesupport (= 5.1.7)
+      arel (~> 8.0)
+    activesupport (5.1.7)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 0.7, < 2)
+      minitest (~> 5.1)
+      tzinfo (~> 1.1)
+    appraisal (2.5.0)
+      bundler
+      rake
+      thor (>= 0.14.0)
+    arel (8.0.0)
+    ast (2.4.2)
+    byebug (11.1.3)
+    concurrent-ruby (1.2.3)
+    diff-lcs (1.5.1)
+    i18n (1.14.4)
+      concurrent-ruby (~> 1.0)
+    json (2.7.2)
+    kwalify (0.7.2)
+    language_server-protocol (3.17.0.3)
+    minitest (5.22.3)
+    mysql2 (0.5.6)
+    parallel (1.24.0)
+    parser (3.2.2.4)
+      ast (~> 2.4.1)
+      racc
+    racc (1.7.3)
+    rainbow (3.1.1)
+    rake (10.5.0)
+    reek (6.1.4)
+      kwalify (~> 0.7.0)
+      parser (~> 3.2.0)
+      rainbow (>= 2.0, < 4.0)
+    regexp_parser (2.9.0)
+    rexml (3.2.6)
+    rspec (3.6.0)
+      rspec-core (~> 3.6.0)
+      rspec-expectations (~> 3.6.0)
+      rspec-mocks (~> 3.6.0)
+    rspec-core (3.6.0)
+      rspec-support (~> 3.6.0)
+    rspec-expectations (3.6.0)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.6.0)
+    rspec-its (1.3.0)
+      rspec-core (>= 3.0.0)
+      rspec-expectations (>= 3.0.0)
+    rspec-mocks (3.6.0)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.6.0)
+    rspec-support (3.6.0)
+    rubocop (1.59.0)
+      json (~> 2.3)
+      language_server-protocol (>= 3.17.0)
+      parallel (~> 1.10)
+      parser (>= 3.2.2.4)
+      rainbow (>= 2.2.2, < 4.0)
+      regexp_parser (>= 1.8, < 3.0)
+      rexml (>= 3.2.5, < 4.0)
+      rubocop-ast (>= 1.30.0, < 2.0)
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (>= 2.4.0, < 3.0)
+    rubocop-ast (1.30.0)
+      parser (>= 3.2.1.0)
+    rubocop-capybara (2.20.0)
+      rubocop (~> 1.41)
+    rubocop-factory_bot (2.25.1)
+      rubocop (~> 1.41)
+    rubocop-rspec (2.29.1)
+      rubocop (~> 1.40)
+      rubocop-capybara (~> 2.17)
+      rubocop-factory_bot (~> 2.22)
+      rubocop-rspec_rails (~> 2.28)
+    rubocop-rspec_rails (2.28.2)
+      rubocop (~> 1.40)
+    ruby-progressbar (1.13.0)
+    thor (1.3.1)
+    thread_safe (0.3.6)
+    tzinfo (1.2.11)
+      thread_safe (~> 0.1)
+    unicode-display_width (2.5.0)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  activerecord (~> 5.1.0)
+  appraisal
+  byebug
+  immortal!
+  mysql2
+  rake (~> 10.0)
+  reek
+  rspec (~> 3.6.0)
+  rspec-its
+  rubocop
+  rubocop-rspec
+
+BUNDLED WITH
+   2.1.4
diff --git a/gemfiles/activerecord_42.gemfile b/gemfiles/activerecord_52.gemfile
similarity index 61%
rename from gemfiles/activerecord_42.gemfile
rename to gemfiles/activerecord_52.gemfile
index 8f0d914..7c291f1 100644
--- a/gemfiles/activerecord_42.gemfile
+++ b/gemfiles/activerecord_52.gemfile
@@ -2,7 +2,7 @@
 
 source "http://rubygems.org"
 
-gem "activerecord", "~> 4.2.0"
-gem "mysql2", "~> 0.4.0"
+gem "activerecord", "~> 5.2.0"
+gem "mysql2"
 
 gemspec path: "../"
diff --git a/gemfiles/activerecord_52.gemfile.lock b/gemfiles/activerecord_52.gemfile.lock
new file mode 100644
index 0000000..ac73f2a
--- /dev/null
+++ b/gemfiles/activerecord_52.gemfile.lock
@@ -0,0 +1,114 @@
+PATH
+  remote: ..
+  specs:
+    immortal (3.1.0)
+      activerecord (>= 4.1.0, < 6.0)
+
+GEM
+  remote: http://rubygems.org/
+  specs:
+    activemodel (5.2.8.1)
+      activesupport (= 5.2.8.1)
+    activerecord (5.2.8.1)
+      activemodel (= 5.2.8.1)
+      activesupport (= 5.2.8.1)
+      arel (>= 9.0)
+    activesupport (5.2.8.1)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 0.7, < 2)
+      minitest (~> 5.1)
+      tzinfo (~> 1.1)
+    appraisal (2.5.0)
+      bundler
+      rake
+      thor (>= 0.14.0)
+    arel (9.0.0)
+    ast (2.4.2)
+    byebug (11.1.3)
+    concurrent-ruby (1.2.3)
+    diff-lcs (1.5.1)
+    i18n (1.14.4)
+      concurrent-ruby (~> 1.0)
+    json (2.7.2)
+    kwalify (0.7.2)
+    language_server-protocol (3.17.0.3)
+    minitest (5.22.3)
+    mysql2 (0.5.6)
+    parallel (1.24.0)
+    parser (3.2.2.4)
+      ast (~> 2.4.1)
+      racc
+    racc (1.7.3)
+    rainbow (3.1.1)
+    rake (10.5.0)
+    reek (6.1.4)
+      kwalify (~> 0.7.0)
+      parser (~> 3.2.0)
+      rainbow (>= 2.0, < 4.0)
+    regexp_parser (2.9.0)
+    rexml (3.2.6)
+    rspec (3.6.0)
+      rspec-core (~> 3.6.0)
+      rspec-expectations (~> 3.6.0)
+      rspec-mocks (~> 3.6.0)
+    rspec-core (3.6.0)
+      rspec-support (~> 3.6.0)
+    rspec-expectations (3.6.0)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.6.0)
+    rspec-its (1.3.0)
+      rspec-core (>= 3.0.0)
+      rspec-expectations (>= 3.0.0)
+    rspec-mocks (3.6.0)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.6.0)
+    rspec-support (3.6.0)
+    rubocop (1.59.0)
+      json (~> 2.3)
+      language_server-protocol (>= 3.17.0)
+      parallel (~> 1.10)
+      parser (>= 3.2.2.4)
+      rainbow (>= 2.2.2, < 4.0)
+      regexp_parser (>= 1.8, < 3.0)
+      rexml (>= 3.2.5, < 4.0)
+      rubocop-ast (>= 1.30.0, < 2.0)
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (>= 2.4.0, < 3.0)
+    rubocop-ast (1.30.0)
+      parser (>= 3.2.1.0)
+    rubocop-capybara (2.20.0)
+      rubocop (~> 1.41)
+    rubocop-factory_bot (2.25.1)
+      rubocop (~> 1.41)
+    rubocop-rspec (2.29.1)
+      rubocop (~> 1.40)
+      rubocop-capybara (~> 2.17)
+      rubocop-factory_bot (~> 2.22)
+      rubocop-rspec_rails (~> 2.28)
+    rubocop-rspec_rails (2.28.2)
+      rubocop (~> 1.40)
+    ruby-progressbar (1.13.0)
+    thor (1.3.1)
+    thread_safe (0.3.6)
+    tzinfo (1.2.11)
+      thread_safe (~> 0.1)
+    unicode-display_width (2.5.0)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  activerecord (~> 5.2.0)
+  appraisal
+  byebug
+  immortal!
+  mysql2
+  rake (~> 10.0)
+  reek
+  rspec (~> 3.6.0)
+  rspec-its
+  rubocop
+  rubocop-rspec
+
+BUNDLED WITH
+   2.1.4
diff --git a/immortal.gemspec b/immortal.gemspec
index eceeb2d..8e8b2ad 100644
--- a/immortal.gemspec
+++ b/immortal.gemspec
@@ -23,7 +23,7 @@ Gem::Specification.new do |spec|
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = %w[lib]
 
-  spec.add_dependency 'activerecord', '>= 4.1.0', '< 5.1'
+  spec.add_dependency 'activerecord', '>= 4.1.0', '< 6.0'
   spec.add_development_dependency 'appraisal'
   spec.add_development_dependency 'rspec', '~> 3.6.0'
   spec.add_development_dependency 'rspec-its'