diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 849b162..ef549fa 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -23,13 +23,7 @@ jobs:
       fail-fast: false
       matrix:
         include:
-        - ruby: 2.5.8
-          gemfile: Gemfile.4.2.mysql2
-        - ruby: 2.5.8
-          gemfile: Gemfile.5.2.mysql2
-        - ruby: 2.5.8
-          gemfile: Gemfile.6.0.mysql2
-        - ruby: 2.5.8
+        - ruby: 2.7.8
           gemfile: Gemfile.6.1.mysql2
         - ruby: 3.2.0
           gemfile: Gemfile.6.1.mysql2
@@ -39,6 +33,8 @@ jobs:
           gemfile: Gemfile.7.1.mysql2
         - ruby: 3.3.4
           gemfile: Gemfile.7.2.mysql2
+        - ruby: 3.3.4
+          gemfile: Gemfile.8.0.mysql2
     env:
       BUNDLE_GEMFILE: "${{ matrix.gemfile }}"
     steps:
@@ -71,13 +67,7 @@ jobs:
       fail-fast: false
       matrix:
         include:
-        - ruby: 2.5.8
-          gemfile: Gemfile.4.2.pg
-        - ruby: 2.5.8
-          gemfile: Gemfile.5.2.pg
-        - ruby: 2.5.8
-          gemfile: Gemfile.6.0.pg
-        - ruby: 2.5.8
+        - ruby: 2.7.8
           gemfile: Gemfile.6.1.pg
         - ruby: 3.2.0
           gemfile: Gemfile.6.1.pg
@@ -87,6 +77,8 @@ jobs:
           gemfile: Gemfile.7.1.pg
         - ruby: 3.3.4
           gemfile: Gemfile.7.2.pg
+        - ruby: 3.3.4
+          gemfile: Gemfile.8.0.pg
     env:
       BUNDLE_GEMFILE: "${{ matrix.gemfile }}"
     steps:
diff --git a/Gemfile b/Gemfile
index 0048d2c..6730b2c 120000
--- a/Gemfile
+++ b/Gemfile
@@ -1 +1 @@
-Gemfile.5.2.pg
\ No newline at end of file
+Gemfile.7.2.pg
\ No newline at end of file
diff --git a/Gemfile.4.2.mysql2 b/Gemfile.4.2.mysql2
deleted file mode 100644
index abb9869..0000000
--- a/Gemfile.4.2.mysql2
+++ /dev/null
@@ -1,15 +0,0 @@
-source 'https://rubygems.org'
-
-# Runtime dependencies
-gem 'activerecord', '~>4.2.1'
-gem 'mysql2', '~> 0.4.10'
-
-# Development dependencies
-gem 'database_cleaner'
-gem 'rake'
-gem 'rspec', '~>3.4'
-gem 'byebug'
-gem 'gemika'
-
-# Gem under test
-gem 'minidusen', :path => '.'
diff --git a/Gemfile.4.2.mysql2.lock b/Gemfile.4.2.mysql2.lock
deleted file mode 100644
index 2f2725a..0000000
--- a/Gemfile.4.2.mysql2.lock
+++ /dev/null
@@ -1,69 +0,0 @@
-PATH
-  remote: .
-  specs:
-    minidusen (0.11.2)
-      activerecord (>= 3.2)
-      activesupport (>= 3.2)
-      edge_rider (>= 0.2.5)
-
-GEM
-  remote: https://rubygems.org/
-  specs:
-    activemodel (4.2.7.1)
-      activesupport (= 4.2.7.1)
-      builder (~> 3.1)
-    activerecord (4.2.7.1)
-      activemodel (= 4.2.7.1)
-      activesupport (= 4.2.7.1)
-      arel (~> 6.0)
-    activesupport (4.2.7.1)
-      i18n (~> 0.7)
-      json (~> 1.7, >= 1.7.7)
-      minitest (~> 5.1)
-      thread_safe (~> 0.3, >= 0.3.4)
-      tzinfo (~> 1.1)
-    arel (6.0.3)
-    builder (3.2.2)
-    byebug (9.0.5)
-    database_cleaner (1.5.3)
-    diff-lcs (1.2.5)
-    edge_rider (2.1.1)
-      activerecord (>= 3.2)
-    gemika (0.8.1)
-    i18n (0.7.0)
-    json (1.8.6)
-    minitest (5.9.0)
-    mysql2 (0.4.10)
-    rake (11.3.0)
-    rspec (3.5.0)
-      rspec-core (~> 3.5.0)
-      rspec-expectations (~> 3.5.0)
-      rspec-mocks (~> 3.5.0)
-    rspec-core (3.5.3)
-      rspec-support (~> 3.5.0)
-    rspec-expectations (3.5.0)
-      diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.5.0)
-    rspec-mocks (3.5.0)
-      diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.5.0)
-    rspec-support (3.5.0)
-    thread_safe (0.3.6)
-    tzinfo (1.2.2)
-      thread_safe (~> 0.1)
-
-PLATFORMS
-  ruby
-
-DEPENDENCIES
-  activerecord (~> 4.2.1)
-  byebug
-  database_cleaner
-  gemika
-  minidusen!
-  mysql2 (~> 0.4.10)
-  rake
-  rspec (~> 3.4)
-
-BUNDLED WITH
-   1.17.3
diff --git a/Gemfile.4.2.pg b/Gemfile.4.2.pg
deleted file mode 100644
index cf08715..0000000
--- a/Gemfile.4.2.pg
+++ /dev/null
@@ -1,15 +0,0 @@
-source 'https://rubygems.org'
-
-# Runtime dependencies
-gem 'activerecord', '~>4.2.1'
-gem 'pg'
-
-# Development dependencies
-gem 'rake'
-gem 'database_cleaner'
-gem 'rspec', '~>3.4'
-gem 'byebug'
-gem 'gemika'
-
-# Gem under test
-gem 'minidusen', :path => '.'
diff --git a/Gemfile.4.2.pg.lock b/Gemfile.4.2.pg.lock
deleted file mode 100644
index b7d62fa..0000000
--- a/Gemfile.4.2.pg.lock
+++ /dev/null
@@ -1,69 +0,0 @@
-PATH
-  remote: .
-  specs:
-    minidusen (0.11.2)
-      activerecord (>= 3.2)
-      activesupport (>= 3.2)
-      edge_rider (>= 0.2.5)
-
-GEM
-  remote: https://rubygems.org/
-  specs:
-    activemodel (4.2.7.1)
-      activesupport (= 4.2.7.1)
-      builder (~> 3.1)
-    activerecord (4.2.7.1)
-      activemodel (= 4.2.7.1)
-      activesupport (= 4.2.7.1)
-      arel (~> 6.0)
-    activesupport (4.2.7.1)
-      i18n (~> 0.7)
-      json (~> 1.7, >= 1.7.7)
-      minitest (~> 5.1)
-      thread_safe (~> 0.3, >= 0.3.4)
-      tzinfo (~> 1.1)
-    arel (6.0.3)
-    builder (3.2.2)
-    byebug (9.0.5)
-    database_cleaner (1.5.3)
-    diff-lcs (1.2.5)
-    edge_rider (2.1.1)
-      activerecord (>= 3.2)
-    gemika (0.8.1)
-    i18n (0.7.0)
-    json (1.8.6)
-    minitest (5.9.0)
-    pg (0.19.0)
-    rake (11.3.0)
-    rspec (3.5.0)
-      rspec-core (~> 3.5.0)
-      rspec-expectations (~> 3.5.0)
-      rspec-mocks (~> 3.5.0)
-    rspec-core (3.5.3)
-      rspec-support (~> 3.5.0)
-    rspec-expectations (3.5.0)
-      diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.5.0)
-    rspec-mocks (3.5.0)
-      diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.5.0)
-    rspec-support (3.5.0)
-    thread_safe (0.3.6)
-    tzinfo (1.2.2)
-      thread_safe (~> 0.1)
-
-PLATFORMS
-  ruby
-
-DEPENDENCIES
-  activerecord (~> 4.2.1)
-  byebug
-  database_cleaner
-  gemika
-  minidusen!
-  pg
-  rake
-  rspec (~> 3.4)
-
-BUNDLED WITH
-   1.17.3
diff --git a/Gemfile.5.2.mysql2 b/Gemfile.5.2.mysql2
deleted file mode 100644
index 3ae87a9..0000000
--- a/Gemfile.5.2.mysql2
+++ /dev/null
@@ -1,16 +0,0 @@
-source 'https://rubygems.org'
-
-# Runtime dependencies
-gem 'activerecord', '~>5.2.3'
-gem 'mysql2', '~>0.4.4'
-gem 'i18n', '<=1.5.1' # Required to support tests for Ruby 2.2.x
-
-# Development dependencies
-gem 'rake'
-gem 'database_cleaner'
-gem 'rspec', '~>3.5'
-gem 'byebug'
-gem 'gemika'
-
-# Gem under test
-gem 'minidusen', :path => '.'
diff --git a/Gemfile.5.2.mysql2.lock b/Gemfile.5.2.mysql2.lock
deleted file mode 100644
index 0cabf8e..0000000
--- a/Gemfile.5.2.mysql2.lock
+++ /dev/null
@@ -1,68 +0,0 @@
-PATH
-  remote: .
-  specs:
-    minidusen (0.11.2)
-      activerecord (>= 3.2)
-      activesupport (>= 3.2)
-      edge_rider (>= 0.2.5)
-
-GEM
-  remote: https://rubygems.org/
-  specs:
-    activemodel (5.2.3)
-      activesupport (= 5.2.3)
-    activerecord (5.2.3)
-      activemodel (= 5.2.3)
-      activesupport (= 5.2.3)
-      arel (>= 9.0)
-    activesupport (5.2.3)
-      concurrent-ruby (~> 1.0, >= 1.0.2)
-      i18n (>= 0.7, < 2)
-      minitest (~> 5.1)
-      tzinfo (~> 1.1)
-    arel (9.0.0)
-    byebug (9.0.5)
-    concurrent-ruby (1.1.5)
-    database_cleaner (1.7.0)
-    diff-lcs (1.2.5)
-    edge_rider (2.1.1)
-      activerecord (>= 3.2)
-    gemika (0.8.1)
-    i18n (1.5.1)
-      concurrent-ruby (~> 1.0)
-    minitest (5.11.3)
-    mysql2 (0.4.10)
-    rake (11.3.0)
-    rspec (3.5.0)
-      rspec-core (~> 3.5.0)
-      rspec-expectations (~> 3.5.0)
-      rspec-mocks (~> 3.5.0)
-    rspec-core (3.5.3)
-      rspec-support (~> 3.5.0)
-    rspec-expectations (3.5.0)
-      diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.5.0)
-    rspec-mocks (3.5.0)
-      diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.5.0)
-    rspec-support (3.5.0)
-    thread_safe (0.3.6)
-    tzinfo (1.2.5)
-      thread_safe (~> 0.1)
-
-PLATFORMS
-  ruby
-
-DEPENDENCIES
-  activerecord (~> 5.2.3)
-  byebug
-  database_cleaner
-  gemika
-  i18n (<= 1.5.1)
-  minidusen!
-  mysql2 (~> 0.4.4)
-  rake
-  rspec (~> 3.5)
-
-BUNDLED WITH
-   1.17.3
diff --git a/Gemfile.5.2.pg b/Gemfile.5.2.pg
deleted file mode 100644
index 3fc948b..0000000
--- a/Gemfile.5.2.pg
+++ /dev/null
@@ -1,16 +0,0 @@
-source 'https://rubygems.org'
-
-# Runtime dependencies
-gem 'activerecord', '~>5.2.3'
-gem 'pg', '~>0.18.4'
-gem 'i18n', '<=1.5.1' # Required to support tests for Ruby 2.2.x
-
-# Development dependencies
-gem 'rake'
-gem 'database_cleaner'
-gem 'rspec', '~>3.5'
-gem 'byebug'
-gem 'gemika'
-
-# Gem under test
-gem 'minidusen', :path => '.'
diff --git a/Gemfile.5.2.pg.lock b/Gemfile.5.2.pg.lock
deleted file mode 100644
index d4aa62b..0000000
--- a/Gemfile.5.2.pg.lock
+++ /dev/null
@@ -1,68 +0,0 @@
-PATH
-  remote: .
-  specs:
-    minidusen (0.11.2)
-      activerecord (>= 3.2)
-      activesupport (>= 3.2)
-      edge_rider (>= 0.2.5)
-
-GEM
-  remote: https://rubygems.org/
-  specs:
-    activemodel (5.2.3)
-      activesupport (= 5.2.3)
-    activerecord (5.2.3)
-      activemodel (= 5.2.3)
-      activesupport (= 5.2.3)
-      arel (>= 9.0)
-    activesupport (5.2.3)
-      concurrent-ruby (~> 1.0, >= 1.0.2)
-      i18n (>= 0.7, < 2)
-      minitest (~> 5.1)
-      tzinfo (~> 1.1)
-    arel (9.0.0)
-    byebug (9.0.5)
-    concurrent-ruby (1.1.5)
-    database_cleaner (1.7.0)
-    diff-lcs (1.2.5)
-    edge_rider (2.1.1)
-      activerecord (>= 3.2)
-    gemika (0.8.1)
-    i18n (1.5.1)
-      concurrent-ruby (~> 1.0)
-    minitest (5.11.3)
-    pg (0.18.4)
-    rake (13.0.6)
-    rspec (3.5.0)
-      rspec-core (~> 3.5.0)
-      rspec-expectations (~> 3.5.0)
-      rspec-mocks (~> 3.5.0)
-    rspec-core (3.5.3)
-      rspec-support (~> 3.5.0)
-    rspec-expectations (3.5.0)
-      diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.5.0)
-    rspec-mocks (3.5.0)
-      diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.5.0)
-    rspec-support (3.5.0)
-    thread_safe (0.3.6)
-    tzinfo (1.2.5)
-      thread_safe (~> 0.1)
-
-PLATFORMS
-  ruby
-
-DEPENDENCIES
-  activerecord (~> 5.2.3)
-  byebug
-  database_cleaner
-  gemika
-  i18n (<= 1.5.1)
-  minidusen!
-  pg (~> 0.18.4)
-  rake
-  rspec (~> 3.5)
-
-BUNDLED WITH
-   2.2.28
diff --git a/Gemfile.6.0.mysql2.lock b/Gemfile.6.0.mysql2.lock
deleted file mode 100644
index 7c6a7f8..0000000
--- a/Gemfile.6.0.mysql2.lock
+++ /dev/null
@@ -1,67 +0,0 @@
-PATH
-  remote: .
-  specs:
-    minidusen (0.11.2)
-      activerecord (>= 3.2)
-      activesupport (>= 3.2)
-      edge_rider (>= 0.2.5)
-
-GEM
-  remote: https://rubygems.org/
-  specs:
-    activemodel (6.0.3.4)
-      activesupport (= 6.0.3.4)
-    activerecord (6.0.3.4)
-      activemodel (= 6.0.3.4)
-      activesupport (= 6.0.3.4)
-    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)
-    byebug (11.0.1)
-    concurrent-ruby (1.1.7)
-    database_cleaner (1.7.0)
-    diff-lcs (1.3)
-    edge_rider (2.1.1)
-      activerecord (>= 3.2)
-    gemika (0.8.1)
-    i18n (1.8.5)
-      concurrent-ruby (~> 1.0)
-    minitest (5.14.2)
-    mysql2 (0.4.10)
-    rake (12.3.2)
-    rspec (3.8.0)
-      rspec-core (~> 3.8.0)
-      rspec-expectations (~> 3.8.0)
-      rspec-mocks (~> 3.8.0)
-    rspec-core (3.8.0)
-      rspec-support (~> 3.8.0)
-    rspec-expectations (3.8.2)
-      diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.8.0)
-    rspec-mocks (3.8.0)
-      diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.8.0)
-    rspec-support (3.8.0)
-    thread_safe (0.3.6)
-    tzinfo (1.2.7)
-      thread_safe (~> 0.1)
-    zeitwerk (2.4.0)
-
-PLATFORMS
-  ruby
-
-DEPENDENCIES
-  activerecord (~> 6.0.0)
-  byebug
-  database_cleaner
-  gemika
-  minidusen!
-  mysql2 (~> 0.4.4)
-  rake
-  rspec (~> 3.5)
-
-BUNDLED WITH
-   1.17.3
diff --git a/Gemfile.6.0.pg.lock b/Gemfile.6.0.pg.lock
deleted file mode 100644
index 12b1e3f..0000000
--- a/Gemfile.6.0.pg.lock
+++ /dev/null
@@ -1,67 +0,0 @@
-PATH
-  remote: .
-  specs:
-    minidusen (0.11.2)
-      activerecord (>= 3.2)
-      activesupport (>= 3.2)
-      edge_rider (>= 0.2.5)
-
-GEM
-  remote: https://rubygems.org/
-  specs:
-    activemodel (6.0.3.4)
-      activesupport (= 6.0.3.4)
-    activerecord (6.0.3.4)
-      activemodel (= 6.0.3.4)
-      activesupport (= 6.0.3.4)
-    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)
-    byebug (11.0.1)
-    concurrent-ruby (1.1.7)
-    database_cleaner (1.7.0)
-    diff-lcs (1.3)
-    edge_rider (2.1.1)
-      activerecord (>= 3.2)
-    gemika (0.8.1)
-    i18n (1.8.5)
-      concurrent-ruby (~> 1.0)
-    minitest (5.14.2)
-    pg (0.18.4)
-    rake (12.3.2)
-    rspec (3.8.0)
-      rspec-core (~> 3.8.0)
-      rspec-expectations (~> 3.8.0)
-      rspec-mocks (~> 3.8.0)
-    rspec-core (3.8.0)
-      rspec-support (~> 3.8.0)
-    rspec-expectations (3.8.2)
-      diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.8.0)
-    rspec-mocks (3.8.0)
-      diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.8.0)
-    rspec-support (3.8.0)
-    thread_safe (0.3.6)
-    tzinfo (1.2.7)
-      thread_safe (~> 0.1)
-    zeitwerk (2.4.0)
-
-PLATFORMS
-  ruby
-
-DEPENDENCIES
-  activerecord (~> 6.0.0)
-  byebug
-  database_cleaner
-  gemika
-  minidusen!
-  pg (~> 0.18.4)
-  rake
-  rspec (~> 3.5)
-
-BUNDLED WITH
-   1.17.3
diff --git a/Gemfile.7.1.mysql2.lock b/Gemfile.7.1.mysql2.lock
index ac419eb..19765ae 100644
--- a/Gemfile.7.1.mysql2.lock
+++ b/Gemfile.7.1.mysql2.lock
@@ -65,7 +65,6 @@ GEM
       concurrent-ruby (~> 1.0)
 
 PLATFORMS
-  ruby
   x86_64-linux
 
 DEPENDENCIES
diff --git a/Gemfile.7.1.pg.lock b/Gemfile.7.1.pg.lock
index 073351a..5b08e46 100644
--- a/Gemfile.7.1.pg.lock
+++ b/Gemfile.7.1.pg.lock
@@ -65,7 +65,6 @@ GEM
       concurrent-ruby (~> 1.0)
 
 PLATFORMS
-  ruby
   x86_64-linux
 
 DEPENDENCIES
diff --git a/Gemfile.7.2.mysql2.lock b/Gemfile.7.2.mysql2.lock
index 1753189..2c7f2af 100644
--- a/Gemfile.7.2.mysql2.lock
+++ b/Gemfile.7.2.mysql2.lock
@@ -67,7 +67,6 @@ GEM
       concurrent-ruby (~> 1.0)
 
 PLATFORMS
-  ruby
   x86_64-linux
 
 DEPENDENCIES
diff --git a/Gemfile.7.2.pg.lock b/Gemfile.7.2.pg.lock
index dcfedc8..1c87490 100644
--- a/Gemfile.7.2.pg.lock
+++ b/Gemfile.7.2.pg.lock
@@ -67,7 +67,6 @@ GEM
       concurrent-ruby (~> 1.0)
 
 PLATFORMS
-  ruby
   x86_64-linux
 
 DEPENDENCIES
diff --git a/Gemfile.6.0.mysql2 b/Gemfile.8.0.mysql2
similarity index 79%
rename from Gemfile.6.0.mysql2
rename to Gemfile.8.0.mysql2
index 1c0a1d7..a49e382 100644
--- a/Gemfile.6.0.mysql2
+++ b/Gemfile.8.0.mysql2
@@ -1,8 +1,8 @@
 source 'https://rubygems.org'
 
 # Runtime dependencies
-gem 'activerecord', '~>6.0.0'
-gem 'mysql2', '~>0.4.4'
+gem 'activerecord', '~>8.0.1'
+gem 'mysql2', '~>0.5'
 
 # Development dependencies
 gem 'rake'
diff --git a/Gemfile.8.0.mysql2.lock b/Gemfile.8.0.mysql2.lock
new file mode 100644
index 0000000..0916751
--- /dev/null
+++ b/Gemfile.8.0.mysql2.lock
@@ -0,0 +1,87 @@
+PATH
+  remote: .
+  specs:
+    minidusen (0.11.2)
+      activerecord (>= 3.2)
+      activesupport (>= 3.2)
+      edge_rider (>= 0.2.5)
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    activemodel (8.0.1)
+      activesupport (= 8.0.1)
+    activerecord (8.0.1)
+      activemodel (= 8.0.1)
+      activesupport (= 8.0.1)
+      timeout (>= 0.4.0)
+    activesupport (8.0.1)
+      base64
+      benchmark (>= 0.3)
+      bigdecimal
+      concurrent-ruby (~> 1.0, >= 1.3.1)
+      connection_pool (>= 2.2.5)
+      drb
+      i18n (>= 1.6, < 2)
+      logger (>= 1.4.2)
+      minitest (>= 5.1)
+      securerandom (>= 0.3)
+      tzinfo (~> 2.0, >= 2.0.5)
+      uri (>= 0.13.1)
+    base64 (0.2.0)
+    benchmark (0.4.0)
+    bigdecimal (3.1.8)
+    byebug (11.1.3)
+    concurrent-ruby (1.3.4)
+    connection_pool (2.4.1)
+    database_cleaner (2.0.2)
+      database_cleaner-active_record (>= 2, < 3)
+    database_cleaner-active_record (2.2.0)
+      activerecord (>= 5.a)
+      database_cleaner-core (~> 2.0.0)
+    database_cleaner-core (2.0.1)
+    diff-lcs (1.5.1)
+    drb (2.2.1)
+    edge_rider (2.3.0)
+      activerecord (>= 3.2)
+    gemika (0.8.3)
+    i18n (1.14.5)
+      concurrent-ruby (~> 1.0)
+    logger (1.6.1)
+    minitest (5.25.1)
+    mysql2 (0.5.6)
+    rake (13.2.1)
+    rspec (3.13.0)
+      rspec-core (~> 3.13.0)
+      rspec-expectations (~> 3.13.0)
+      rspec-mocks (~> 3.13.0)
+    rspec-core (3.13.1)
+      rspec-support (~> 3.13.0)
+    rspec-expectations (3.13.2)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.13.0)
+    rspec-mocks (3.13.1)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.13.0)
+    rspec-support (3.13.1)
+    securerandom (0.3.1)
+    timeout (0.4.3)
+    tzinfo (2.0.6)
+      concurrent-ruby (~> 1.0)
+    uri (1.0.2)
+
+PLATFORMS
+  x86_64-linux
+
+DEPENDENCIES
+  activerecord (~> 8.0.1)
+  byebug
+  database_cleaner
+  gemika
+  minidusen!
+  mysql2 (~> 0.5)
+  rake
+  rspec (~> 3.5)
+
+BUNDLED WITH
+   2.5.6
diff --git a/Gemfile.6.0.pg b/Gemfile.8.0.pg
similarity index 80%
rename from Gemfile.6.0.pg
rename to Gemfile.8.0.pg
index 9f57bab..de80414 100644
--- a/Gemfile.6.0.pg
+++ b/Gemfile.8.0.pg
@@ -1,8 +1,8 @@
 source 'https://rubygems.org'
 
 # Runtime dependencies
-gem 'activerecord', '~>6.0.0'
-gem 'pg', '~>0.18.4'
+gem 'activerecord', '~>8.0.1'
+gem 'pg', '~> 1.4.0'
 
 # Development dependencies
 gem 'rake'
diff --git a/Gemfile.8.0.pg.lock b/Gemfile.8.0.pg.lock
new file mode 100644
index 0000000..f18c0d3
--- /dev/null
+++ b/Gemfile.8.0.pg.lock
@@ -0,0 +1,87 @@
+PATH
+  remote: .
+  specs:
+    minidusen (0.11.2)
+      activerecord (>= 3.2)
+      activesupport (>= 3.2)
+      edge_rider (>= 0.2.5)
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    activemodel (8.0.1)
+      activesupport (= 8.0.1)
+    activerecord (8.0.1)
+      activemodel (= 8.0.1)
+      activesupport (= 8.0.1)
+      timeout (>= 0.4.0)
+    activesupport (8.0.1)
+      base64
+      benchmark (>= 0.3)
+      bigdecimal
+      concurrent-ruby (~> 1.0, >= 1.3.1)
+      connection_pool (>= 2.2.5)
+      drb
+      i18n (>= 1.6, < 2)
+      logger (>= 1.4.2)
+      minitest (>= 5.1)
+      securerandom (>= 0.3)
+      tzinfo (~> 2.0, >= 2.0.5)
+      uri (>= 0.13.1)
+    base64 (0.2.0)
+    benchmark (0.4.0)
+    bigdecimal (3.1.8)
+    byebug (11.1.3)
+    concurrent-ruby (1.3.4)
+    connection_pool (2.4.1)
+    database_cleaner (2.0.2)
+      database_cleaner-active_record (>= 2, < 3)
+    database_cleaner-active_record (2.2.0)
+      activerecord (>= 5.a)
+      database_cleaner-core (~> 2.0.0)
+    database_cleaner-core (2.0.1)
+    diff-lcs (1.5.1)
+    drb (2.2.1)
+    edge_rider (2.3.0)
+      activerecord (>= 3.2)
+    gemika (0.8.3)
+    i18n (1.14.5)
+      concurrent-ruby (~> 1.0)
+    logger (1.6.1)
+    minitest (5.25.1)
+    pg (1.4.6)
+    rake (13.2.1)
+    rspec (3.13.0)
+      rspec-core (~> 3.13.0)
+      rspec-expectations (~> 3.13.0)
+      rspec-mocks (~> 3.13.0)
+    rspec-core (3.13.1)
+      rspec-support (~> 3.13.0)
+    rspec-expectations (3.13.2)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.13.0)
+    rspec-mocks (3.13.1)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.13.0)
+    rspec-support (3.13.1)
+    securerandom (0.3.1)
+    timeout (0.4.3)
+    tzinfo (2.0.6)
+      concurrent-ruby (~> 1.0)
+    uri (1.0.2)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  activerecord (~> 8.0.1)
+  byebug
+  database_cleaner
+  gemika
+  minidusen!
+  pg (~> 1.4.0)
+  rake
+  rspec (~> 3.5)
+
+BUNDLED WITH
+   2.5.6
diff --git a/Gemfile.lock b/Gemfile.lock
index a319174..09698d5 120000
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1 +1 @@
-Gemfile.5.2.pg.lock
\ No newline at end of file
+Gemfile.7.2.pg.lock
\ No newline at end of file
diff --git a/README.md b/README.md
index a4569fd..129350a 100644
--- a/README.md
+++ b/README.md
@@ -234,9 +234,6 @@ Supported Rails versions
 
 Minidusen is tested on:
 
-- Rails 4.2
-- Rails 5.2
-- Rails 6.0
 - Rails 6.1
 - Rails 7.0
 - Rails 7.1