diff --git a/estonian_e_invoice.gemspec b/estonian_e_invoice.gemspec
index d1e098e..4184d6c 100644
--- a/estonian_e_invoice.gemspec
+++ b/estonian_e_invoice.gemspec
@@ -31,7 +31,7 @@ Gem::Specification.new do |spec|
   spec.add_runtime_dependency 'nokogiri'
   spec.add_runtime_dependency 'savon'
   spec.add_development_dependency 'bundler', '>= 2.2.10'
-  spec.add_development_dependency 'minitest', '~> 5.0'
+  spec.add_development_dependency 'minitest', '~> 6.0'
   spec.add_development_dependency 'mocha'
   spec.add_development_dependency 'rake', '~> 13.0'
   spec.add_development_dependency 'simplecov'