diff --git a/Gemfile b/Gemfile
index 8347210..ade62ee 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,5 +8,5 @@ group :test do
   gem "simplecov", "~> 0.17.1"
   gem "simplecov-rcov", "~> 0.2.3"
   gem "rake", "~> 13.0"
-  gem "test-unit", "~> 3.3"
+  gem "test-unit", "~> 3.4"
 end
diff --git a/Gemfile.lock b/Gemfile.lock
index 162e0d6..e774524 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -3,7 +3,7 @@ GEM
   specs:
     docile (1.3.2)
     json (2.3.1)
-    power_assert (1.1.5)
+    power_assert (2.0.0)
     rake (13.0.0)
     simplecov (0.17.1)
       docile (~> 1.1)
@@ -12,7 +12,7 @@ GEM
     simplecov-html (0.10.2)
     simplecov-rcov (0.2.3)
       simplecov (>= 0.4.1)
-    test-unit (3.3.4)
+    test-unit (3.4.4)
       power_assert
 
 PLATFORMS
@@ -22,7 +22,7 @@ DEPENDENCIES
   rake (~> 13.0)
   simplecov (~> 0.17.1)
   simplecov-rcov (~> 0.2.3)
-  test-unit (~> 3.3)
+  test-unit (~> 3.4)
 
 BUNDLED WITH
    2.0.2