diff --git a/metasploit-model.gemspec b/metasploit-model.gemspec
index e26bb15..f0f1892 100644
--- a/metasploit-model.gemspec
+++ b/metasploit-model.gemspec
@@ -26,11 +26,13 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'e2mmap'
 
   # Dependency loading
+  # Rails 8.0 upgrade: widened from '~> 7.0' (which means >= 7.0, < 8.0) to
+  # '>= 7.0', '< 8.1' so this gem resolves with both Rails 7.x and 8.0.
+  # The old pessimistic constraint hard-blocked Bundler from pulling Rails 8.
+  spec.add_runtime_dependency 'activemodel', '>= 7.0', '< 8.1'
+  spec.add_runtime_dependency 'activesupport', '>= 7.0', '< 8.1'
 
-  spec.add_runtime_dependency 'activemodel', '~> 7.0'
-  spec.add_runtime_dependency 'activesupport', '~> 7.0'
-
-  spec.add_runtime_dependency 'railties', '~> 7.0'
+  spec.add_runtime_dependency 'railties', '>= 7.0', '< 8.1'
 
   if RUBY_PLATFORM =~ /java/
     # markdown formatting for yard
diff --git a/spec/dummy/config/application.rb b/spec/dummy/config/application.rb
index 4ffb3b7..9526bdb 100644
--- a/spec/dummy/config/application.rb
+++ b/spec/dummy/config/application.rb
@@ -41,6 +41,9 @@ class Application < Rails::Application
     # Enable escaping HTML in JSON.
     config.active_support.escape_html_entities_in_json = true
 
+    # Set cache format version for Rails 7.2+ compatibility
+    config.active_support.cache_format_version = 7.0
+
   end
 end