diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
new file mode 100644
index 0000000..cd767e3
--- /dev/null
+++ b/.github/workflows/ruby.yml
@@ -0,0 +1,32 @@
+name: Ruby
+
+on:
+  push:
+    branches: [ "master", "1.2.0" ]
+  pull_request:
+    branches: [ "master", "1.2.0" ]
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        ruby-version: ['2.6', '2.7.8']
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Set up Ruby
+    # To automatically get bug fixes and new Ruby versions for ruby/setup-ruby,
+    # change this to (see https://github.com/ruby/setup-ruby#versioning):
+    # uses: ruby/setup-ruby@v1
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: ${{ matrix.ruby-version }}
+        bundler-cache: true # runs 'bundle install' and caches installed gems automatically
+        bundler: 2.4
+    - name: Run tests
+      run: bundle exec rspec
diff --git a/Gemfile b/Gemfile
index 3d027e6..6ecb5b1 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,7 +3,8 @@ source 'https://rubygems.org'
 gemspec
 
 group :development do
-  gem 'activerecord'
+  gem 'activerecord', '~>4.2.11.3'
+  gem 'bigdecimal', '~>1.4.0'
   gem 'bson_ext'
   gem 'guard'
   gem 'guard-rspec'
@@ -13,5 +14,5 @@ group :development do
   gem 'rake'
   gem 'RedCloth'
   gem 'rspec'
-  gem 'sqlite3'
+  gem 'sqlite3', '~> 1.3.0'
 end
diff --git a/Gemfile.lock b/Gemfile.lock
index b9d59cb..0468c21 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -6,99 +6,102 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
-    RedCloth (4.2.9)
-    activemodel (4.1.4)
-      activesupport (= 4.1.4)
+    RedCloth (4.3.3)
+    activemodel (4.2.11.3)
+      activesupport (= 4.2.11.3)
       builder (~> 3.1)
-    activerecord (4.1.4)
-      activemodel (= 4.1.4)
-      activesupport (= 4.1.4)
-      arel (~> 5.0.0)
-    activesupport (4.1.4)
-      i18n (~> 0.6, >= 0.6.9)
-      json (~> 1.7, >= 1.7.7)
+    activerecord (4.2.11.3)
+      activemodel (= 4.2.11.3)
+      activesupport (= 4.2.11.3)
+      arel (~> 6.0)
+    activesupport (4.2.11.3)
+      i18n (~> 0.7)
       minitest (~> 5.1)
-      thread_safe (~> 0.1)
+      thread_safe (~> 0.3, >= 0.3.4)
       tzinfo (~> 1.1)
-    arel (5.0.1.20140414130214)
-    bson (2.3.0)
+    arel (6.0.4)
+    bigdecimal (1.4.4)
+    bson (4.15.0)
     bson_ext (1.5.1)
-    builder (3.2.2)
-    celluloid (0.15.2)
-      timers (~> 1.1.0)
-    coderay (1.1.0)
-    connection_pool (2.0.0)
-    diff-lcs (1.2.5)
-    ffi (1.9.3)
-    formatador (0.2.5)
-    guard (2.6.1)
+    builder (3.2.4)
+    coderay (1.1.3)
+    concurrent-ruby (1.2.2)
+    diff-lcs (1.5.0)
+    ffi (1.16.3)
+    formatador (1.1.0)
+    guard (2.18.1)
       formatador (>= 0.2.4)
-      listen (~> 2.7)
-      lumberjack (~> 1.0)
-      pry (>= 0.9.12)
+      listen (>= 2.7, < 4.0)
+      lumberjack (>= 1.0.12, < 2.0)
+      nenv (~> 0.1)
+      notiffany (~> 0.0)
+      pry (>= 0.13.0)
+      shellany (~> 0.0)
       thor (>= 0.18.1)
-    guard-rspec (4.2.10)
+    guard-compat (1.2.1)
+    guard-rspec (4.7.3)
       guard (~> 2.1)
-      rspec (>= 2.14, < 4.0)
-    guard-yard (2.1.1)
+      guard-compat (~> 1.1)
+      rspec (>= 2.99.0, < 4.0)
+    guard-yard (2.2.1)
       guard (>= 1.1.0)
       yard (>= 0.7.0)
-    i18n (0.6.11)
-    json (1.8.1)
-    listen (2.7.9)
-      celluloid (>= 0.15.2)
-      rb-fsevent (>= 0.9.3)
-      rb-inotify (>= 0.9)
-    lumberjack (1.0.9)
-    method_source (0.8.2)
-    minitest (5.4.0)
-    mongoid (4.0.0)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
+    listen (3.8.0)
+      rb-fsevent (~> 0.10, >= 0.10.3)
+      rb-inotify (~> 0.9, >= 0.9.10)
+    lumberjack (1.2.10)
+    method_source (1.0.0)
+    minitest (5.20.0)
+    mongo (2.19.3)
+      bson (>= 4.14.1, < 5.0.0)
+    mongoid (5.4.1)
       activemodel (~> 4.0)
-      moped (~> 2.0.0)
-      origin (~> 2.1)
+      mongo (>= 2.5.1, < 3.0.0)
+      origin (~> 2.3)
       tzinfo (>= 0.3.37)
-    moped (2.0.0)
-      bson (~> 2.2)
-      connection_pool (~> 2.0)
-      optionable (~> 0.2.0)
-    optionable (0.2.0)
-    origin (2.1.1)
-    pry (0.10.0)
-      coderay (~> 1.1.0)
-      method_source (~> 0.8.1)
-      slop (~> 3.4)
-    rake (10.3.2)
-    rb-fsevent (0.9.4)
-    rb-inotify (0.9.5)
-      ffi (>= 0.5.0)
-    rspec (3.0.0)
-      rspec-core (~> 3.0.0)
-      rspec-expectations (~> 3.0.0)
-      rspec-mocks (~> 3.0.0)
-    rspec-core (3.0.2)
-      rspec-support (~> 3.0.0)
-    rspec-expectations (3.0.2)
+    nenv (0.3.0)
+    notiffany (0.1.3)
+      nenv (~> 0.1)
+      shellany (~> 0.0)
+    origin (2.3.1)
+    pry (0.14.2)
+      coderay (~> 1.1)
+      method_source (~> 1.0)
+    rake (13.1.0)
+    rb-fsevent (0.11.2)
+    rb-inotify (0.10.1)
+      ffi (~> 1.0)
+    rspec (3.12.0)
+      rspec-core (~> 3.12.0)
+      rspec-expectations (~> 3.12.0)
+      rspec-mocks (~> 3.12.0)
+    rspec-core (3.12.2)
+      rspec-support (~> 3.12.0)
+    rspec-expectations (3.12.3)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.12.0)
+    rspec-mocks (3.12.6)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.0.0)
-    rspec-mocks (3.0.2)
-      rspec-support (~> 3.0.0)
-    rspec-support (3.0.2)
-    slop (3.5.0)
-    sqlite3 (1.3.9)
-    thor (0.19.1)
-    thread_safe (0.3.4)
-    timers (1.1.0)
-    tzinfo (1.2.1)
+      rspec-support (~> 3.12.0)
+    rspec-support (3.12.1)
+    shellany (0.0.1)
+    sqlite3 (1.3.13)
+    thor (1.3.0)
+    thread_safe (0.3.6)
+    tzinfo (1.2.11)
       thread_safe (~> 0.1)
-    yard (0.8.7.4)
+    yard (0.9.34)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
   RedCloth
-  activerecord
+  activerecord (~> 4.2.11.3)
   attribute_normalizer!
+  bigdecimal (~> 1.4.0)
   bson_ext
   guard
   guard-rspec
@@ -107,4 +110,7 @@ DEPENDENCIES
   pry
   rake
   rspec
-  sqlite3
+  sqlite3 (~> 1.3.0)
+
+BUNDLED WITH
+   2.4.10