diff --git a/mighty_test.gemspec b/mighty_test.gemspec
index fb764da..fa51cc1 100644
--- a/mighty_test.gemspec
+++ b/mighty_test.gemspec
@@ -27,7 +27,7 @@ Gem::Specification.new do |spec|
 
   # Runtime dependencies
   spec.add_dependency "listen", "~> 3.5"
-  spec.add_dependency "minitest", "~> 5.15"
+  spec.add_dependency "minitest", ">= 5.15", "< 7.0"
   spec.add_dependency "minitest-fail-fast", "~> 0.1.0"
   spec.add_dependency "minitest-focus", "~> 1.4"
   spec.add_dependency "minitest-rg", "~> 5.3"