diff --git a/Gemfile.lock b/Gemfile.lock
index e6f5526..cde6bcf 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -6,7 +6,9 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
-    minitest (5.25.1)
+    minitest (6.0.1)
+      prism (~> 1.5)
+    prism (1.7.0)
     rake (13.0.6)
 
 PLATFORMS
@@ -15,7 +17,7 @@ PLATFORMS
 
 DEPENDENCIES
   bundler (~> 2)
-  minitest (~> 5.0)
+  minitest (~> 6.0)
   rake (~> 13.0)
   tempfile-fixture!
 
diff --git a/tempfile-fixture.gemspec b/tempfile-fixture.gemspec
index 260aff9..b4244a7 100644
--- a/tempfile-fixture.gemspec
+++ b/tempfile-fixture.gemspec
@@ -36,6 +36,6 @@ Gem::Specification.new do |spec|
   spec.require_paths = ['lib']
 
   spec.add_development_dependency 'bundler', '~> 2'
-  spec.add_development_dependency 'minitest', '~> 5.0'
+  spec.add_development_dependency 'minitest', '~> 6.0'
   spec.add_development_dependency 'rake', '~> 13.0'
 end