diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b72a6f7..8bf4af9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -9,14 +9,18 @@ jobs:
     strategy:
       matrix:
         ruby-version:
-          - '3.1'
           - '3.2'
           - '3.3'
+          - '3.4'
         gemfile:
           - rails6.1
           - rails7.0
           - rails7.1
           - rails_main
+        include:
+          - {ruby-version: '3.1', gemfile: 'rails6.1'}
+          - {ruby-version: '3.1', gemfile: 'rails7.0'}
+          - {ruby-version: '3.1', gemfile: 'rails7.1'}
     env:
       BUNDLE_GEMFILE: gemfiles/${{ matrix.gemfile }}.gemfile
     steps:
diff --git a/.github/workflows/rails_main_testing.yml b/.github/workflows/rails_main_testing.yml
index 967dd8e..d0b1306 100644
--- a/.github/workflows/rails_main_testing.yml
+++ b/.github/workflows/rails_main_testing.yml
@@ -12,7 +12,7 @@ jobs:
     strategy:
       matrix:
         ruby-version:
-          - '3.3'
+          - '3.4'
         gemfile:
           - rails_main
     env:
diff --git a/gemfiles/rails6.1.gemfile b/gemfiles/rails6.1.gemfile
index 18cca85..72a8e73 100644
--- a/gemfiles/rails6.1.gemfile
+++ b/gemfiles/rails6.1.gemfile
@@ -4,3 +4,7 @@ gemspec path: "../"
 
 gem "activerecord", "~> 6.1.0"
 gem "sqlite3", "~> 1.4"
+gem "base64"
+gem "bigdecimal"
+gem "drb"
+gem "mutex_m"
diff --git a/gemfiles/rails6.1.gemfile.lock b/gemfiles/rails6.1.gemfile.lock
index 4dec9d8..3e7b9f3 100644
--- a/gemfiles/rails6.1.gemfile.lock
+++ b/gemfiles/rails6.1.gemfile.lock
@@ -18,14 +18,18 @@ GEM
       minitest (>= 5.1)
       tzinfo (~> 2.0)
       zeitwerk (~> 2.3)
+    base64 (0.2.0)
+    bigdecimal (3.1.9)
     bump (0.10.0)
     byebug (11.1.3)
     concurrent-ruby (1.2.2)
     diff-lcs (1.5.0)
+    drb (2.2.1)
     i18n (1.14.1)
       concurrent-ruby (~> 1.0)
     mini_portile2 (2.8.4)
-    minitest (5.20.0)
+    minitest (5.25.4)
+    mutex_m (0.3.0)
     rake (13.0.6)
     rspec (3.12.0)
       rspec-core (~> 3.12.0)
@@ -52,9 +56,13 @@ PLATFORMS
 
 DEPENDENCIES
   activerecord (~> 6.1.0)
+  base64
+  bigdecimal
   bump
   bundler
   byebug
+  drb
+  mutex_m
   rake
   rspec (~> 3.5)
   sqlite3 (~> 1.4)
@@ -62,4 +70,4 @@ DEPENDENCIES
   zombie_record!
 
 BUNDLED WITH
-   2.4.20
+   2.6.2
diff --git a/gemfiles/rails7.0.gemfile b/gemfiles/rails7.0.gemfile
index ec812ff..061cb5d 100644
--- a/gemfiles/rails7.0.gemfile
+++ b/gemfiles/rails7.0.gemfile
@@ -4,3 +4,7 @@ gemspec path: "../"
 
 gem "activerecord", "~> 7.0.0"
 gem "sqlite3", "~> 1.4"
+gem "base64"
+gem "bigdecimal"
+gem "drb"
+gem "mutex_m"
diff --git a/gemfiles/rails7.0.gemfile.lock b/gemfiles/rails7.0.gemfile.lock
index 2704c91..fc6a07e 100644
--- a/gemfiles/rails7.0.gemfile.lock
+++ b/gemfiles/rails7.0.gemfile.lock
@@ -17,14 +17,18 @@ GEM
       i18n (>= 1.6, < 2)
       minitest (>= 5.1)
       tzinfo (~> 2.0)
+    base64 (0.2.0)
+    bigdecimal (3.1.9)
     bump (0.10.0)
     byebug (11.1.3)
     concurrent-ruby (1.2.2)
     diff-lcs (1.5.0)
+    drb (2.2.1)
     i18n (1.14.1)
       concurrent-ruby (~> 1.0)
     mini_portile2 (2.8.4)
-    minitest (5.20.0)
+    minitest (5.25.4)
+    mutex_m (0.3.0)
     rake (13.0.6)
     rspec (3.12.0)
       rspec-core (~> 3.12.0)
@@ -50,9 +54,13 @@ PLATFORMS
 
 DEPENDENCIES
   activerecord (~> 7.0.0)
+  base64
+  bigdecimal
   bump
   bundler
   byebug
+  drb
+  mutex_m
   rake
   rspec (~> 3.5)
   sqlite3 (~> 1.4)
@@ -60,4 +68,4 @@ DEPENDENCIES
   zombie_record!
 
 BUNDLED WITH
-   2.4.20
+   2.6.2
diff --git a/gemfiles/rails7.1.gemfile.lock b/gemfiles/rails7.1.gemfile.lock
index 7777bfd..dcf92f7 100644
--- a/gemfiles/rails7.1.gemfile.lock
+++ b/gemfiles/rails7.1.gemfile.lock
@@ -34,7 +34,7 @@ GEM
     i18n (1.14.1)
       concurrent-ruby (~> 1.0)
     mini_portile2 (2.8.4)
-    minitest (5.20.0)
+    minitest (5.25.4)
     mutex_m (0.1.2)
     rake (13.0.6)
     rspec (3.12.0)
@@ -72,4 +72,4 @@ DEPENDENCIES
   zombie_record!
 
 BUNDLED WITH
-   2.4.20
+   2.6.2