diff --git a/Gemfile b/Gemfile
index 098a82f..f0c112c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,6 +2,6 @@ source "https://rubygems.org"
 
 gem "rake"
 gem "rake-compiler"
-gem "test-unit", "~> 3.3.9"
+gem "test-unit", "~> 3.6.2"
 
 gemspec
diff --git a/Gemfile.lock b/Gemfile.lock
index 74ae098..f29dc50 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -6,11 +6,11 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
-    power_assert (2.0.1)
+    power_assert (2.0.3)
     rake (13.0.6)
     rake-compiler (1.1.1)
       rake
-    test-unit (3.3.9)
+    test-unit (3.6.2)
       power_assert
 
 PLATFORMS
@@ -19,7 +19,7 @@ PLATFORMS
 DEPENDENCIES
   rake
   rake-compiler
-  test-unit (~> 3.3.9)
+  test-unit (~> 3.6.2)
   version_sorter!
 
 BUNDLED WITH