diff --git a/Gemfile b/Gemfile
index 3912bf91fd..5d6f453516 100644
--- a/Gemfile
+++ b/Gemfile
@@ -50,7 +50,7 @@ group :test do
   # Disallow v5.19 for now since it breaks mocha.
   # See: https://github.com/freerange/mocha/issues/614
   # Remove this line when mocha has fixed the issue
-  gem "minitest", "< 5.19"
+  gem "minitest", "< 5.21"
 end
 
 # development dependencies
diff --git a/Gemfile.lock b/Gemfile.lock
index 805c73a28c..8fa2580efc 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -112,7 +112,7 @@ GEM
     method_source (1.0.0)
     mini_mime (1.1.2)
     mini_portile2 (2.8.1)
-    minitest (5.18.1)
+    minitest (5.20.0)
     mocha (2.1.0)
       ruby2_keywords (>= 0.0.5)
     msgpack (1.7.0)
@@ -257,7 +257,7 @@ DEPENDENCIES
   listen (~> 3.0)
   lookbook (~> 2.1.1)
   matrix (~> 0.4.2)
-  minitest (< 5.19)
+  minitest (< 5.21)
   mocha
   primer_view_components!
   pry