diff --git a/Gemfile.lock b/Gemfile.lock
index f9e22a2a..536c751c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -56,7 +56,9 @@ GEM
     logger (1.7.0)
     mini_mime (1.1.5)
     mini_portile2 (2.8.9)
-    minitest (5.27.0)
+    minitest (6.0.6)
+      drb (~> 2.0)
+      prism (~> 1.5)
     nokogiri (1.19.3)
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
@@ -75,6 +77,7 @@ GEM
       tdiff (~> 0.4)
     org-ruby (0.9.12)
       rubypants (~> 0.2)
+    prism (1.9.0)
     psych (5.2.3)
       date
       stringio
@@ -127,7 +130,7 @@ DEPENDENCIES
   github-markup!
   html-pipeline (~> 1.0)
   kramdown
-  minitest (~> 5.4, >= 5.4.3)
+  minitest (~> 6.0, >= 5.4.3)
   nokogiri (~> 1.19.2)
   nokogiri-diff (~> 0.3.0)
   org-ruby (= 0.9.12)
diff --git a/github-markup.gemspec b/github-markup.gemspec
index cea949c3..0f1a25e3 100644
--- a/github-markup.gemspec
+++ b/github-markup.gemspec
@@ -22,7 +22,7 @@ Gem::Specification.new do |s|
 
   s.add_development_dependency 'rake', '~> 13'
   s.add_development_dependency 'activesupport', '~> 8.1.3'
-  s.add_development_dependency 'minitest', '~> 5.4', '>= 5.4.3'
+  s.add_development_dependency 'minitest', '>= 5.4.3', '~> 6.0'
   s.add_development_dependency 'html-pipeline', '~> 1.0'
   s.add_development_dependency 'sanitize', '>= 4.6.3'
   s.add_development_dependency 'nokogiri', '~> 1.19.2'