diff --git a/Gemfile b/Gemfile
index 42d851a..fc0bc84 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,7 +4,7 @@ source "https://rubygems.org"
 gemspec
 
 # Pin minitest < 6.0 until Rails supports it
-gem "minitest", "~> 5.0"
+gem "minitest", "~> 6.0"
 
 gem "puma"
 
diff --git a/Gemfile.lock b/Gemfile.lock
index bbd3b00..d1f3140 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -123,7 +123,8 @@ GEM
       net-smtp
     marcel (1.1.0)
     mini_mime (1.1.5)
-    minitest (5.27.0)
+    minitest (6.0.1)
+      prism (~> 1.5)
     net-imap (0.6.2)
       date
       net-protocol
@@ -269,7 +270,7 @@ PLATFORMS
 
 DEPENDENCIES
   kramdown (~> 2.4)
-  minitest (~> 5.0)
+  minitest (~> 6.0)
   propshaft
   puma
   rubocop-rails-omakase