diff --git a/Gemfile.lock b/Gemfile.lock
index cc2fd73..8a0b22c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -3,6 +3,7 @@ PATH
   specs:
     classifier (1.4.4)
       fast-stemmer (~> 1.0)
+      matrix
       mutex_m (~> 0.2)
       rake
 
@@ -23,6 +24,7 @@ GEM
 PLATFORMS
   arm64-darwin-22
   arm64-darwin-23
+  arm64-darwin-24
   x86_64-linux
 
 DEPENDENCIES
diff --git a/classifier.gemspec b/classifier.gemspec
index e802fea..7514767 100644
--- a/classifier.gemspec
+++ b/classifier.gemspec
@@ -12,6 +12,7 @@ Gem::Specification.new do |s|
   s.add_dependency 'fast-stemmer', '~> 1.0'
   s.add_dependency 'mutex_m', '~> 0.2'
   s.add_dependency 'rake'
+  s.add_dependency 'matrix'
   s.add_development_dependency 'minitest'
   s.add_development_dependency 'rdoc'
 end