diff --git a/Gemfile.lock b/Gemfile.lock
index 28845fa..45649bb 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -6,25 +6,35 @@ PATH
 GEM
   remote: https://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)
+    activemodel (7.1.1)
+      activesupport (= 7.1.1)
+    activerecord (7.1.1)
+      activemodel (= 7.1.1)
+      activesupport (= 7.1.1)
+      timeout (>= 0.4.0)
+    activesupport (7.1.1)
+      base64
+      bigdecimal
       concurrent-ruby (~> 1.0, >= 1.0.2)
-      i18n (>= 0.7, < 2)
-      minitest (~> 5.1)
-      tzinfo (~> 1.1)
-    arel (9.0.0)
+      connection_pool (>= 2.2.5)
+      drb
+      i18n (>= 1.6, < 2)
+      minitest (>= 5.1)
+      mutex_m
+      tzinfo (~> 2.0)
+    base64 (0.1.1)
+    bigdecimal (3.1.4)
     coderay (1.1.3)
     concurrent-ruby (1.2.2)
+    connection_pool (2.4.1)
     diff-lcs (1.5.0)
+    drb (2.1.1)
+      ruby2_keywords
     i18n (1.14.1)
       concurrent-ruby (~> 1.0)
     method_source (1.0.0)
     minitest (5.20.0)
+    mutex_m (0.1.2)
     pry (0.14.2)
       coderay (~> 1.1)
       method_source (~> 1.0)
@@ -42,16 +52,17 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.12.0)
     rspec-support (3.12.1)
+    ruby2_keywords (0.0.5)
     sqlite3 (1.3.13)
-    thread_safe (0.3.6)
-    tzinfo (1.2.11)
-      thread_safe (~> 0.1)
+    timeout (0.4.0)
+    tzinfo (2.0.6)
+      concurrent-ruby (~> 1.0)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  activerecord (< 6.0)
+  activerecord (< 8.0)
   bundler
   inheritance_integer_type!
   pry
diff --git a/inheritance_integer_type.gemspec b/inheritance_integer_type.gemspec
index fe34f32..9326f82 100644
--- a/inheritance_integer_type.gemspec
+++ b/inheritance_integer_type.gemspec
@@ -21,7 +21,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "bundler"
   spec.add_development_dependency "rake"
   spec.add_development_dependency "rspec"
-  spec.add_development_dependency "activerecord", "< 6.0"
+  spec.add_development_dependency "activerecord", "< 8.0"
   spec.add_development_dependency "sqlite3", "~> 1.3.6"
   spec.add_development_dependency "pry"
 end