diff --git a/jr-cli.gemspec b/jr-cli.gemspec
index 27639f8..4778d8f 100644
--- a/jr-cli.gemspec
+++ b/jr-cli.gemspec
@@ -23,7 +23,7 @@ Gem::Specification.new do |spec|
 
   spec.add_development_dependency 'bundler', '>= 2.4.21'
   spec.add_development_dependency 'rake', '13.2.1'
-  spec.add_development_dependency 'test-unit', '3.6.2'
+  spec.add_development_dependency 'test-unit', '3.6.3'
   spec.add_development_dependency 'aruba', '2.2.0'
   spec.add_development_dependency 'guard', '2.19.0'
   spec.add_development_dependency 'guard-test', '2.0.8'