diff --git a/pwntools.gemspec b/pwntools.gemspec
index 4a8e65c..729f013 100644
--- a/pwntools.gemspec
+++ b/pwntools.gemspec
@@ -39,7 +39,7 @@ Gem::Specification.new do |s|
   s.add_runtime_dependency 'rubyserial', '~> 0.5'
 
   # TODO(david942j): check why ruby crash during testing if upgrade minitest to 5.10.2/3
-  s.add_development_dependency 'minitest', '= 5.10.1'
+  s.add_development_dependency 'minitest', '= 5.15.0'
   s.add_development_dependency 'pry', '~> 0.10'
   s.add_development_dependency 'rake', '~> 13.0'
   s.add_development_dependency 'rubocop', '~> 1'