diff --git a/Gemfile.lock b/Gemfile.lock
index 7d834ea992..789ac22e07 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -19,7 +19,7 @@ GEM
     parallel (1.22.1)
     parser (3.1.2.1)
       ast (~> 2.4.1)
-    power_assert (2.0.1)
+    power_assert (2.0.2)
     pry (0.14.1)
       coderay (~> 1.1)
       method_source (~> 1.0)
@@ -50,7 +50,7 @@ GEM
       simplecov_json_formatter (~> 0.1)
     simplecov-html (0.12.3)
     simplecov_json_formatter (0.1.4)
-    test-unit (3.5.5)
+    test-unit (3.5.7)
       power_assert
     timecop (0.9.5)
     unicode-display_width (2.3.0)
@@ -70,7 +70,7 @@ DEPENDENCIES
   rubocop-minitest (= 0.23.0)
   rubocop-rake (= 0.6.0)
   simplecov (= 0.21)
-  test-unit (= 3.5.5)
+  test-unit (= 3.5.7)
   timecop (= 0.9.5)
   yard (= 0.9.27)
 
diff --git a/faker.gemspec b/faker.gemspec
index 61b3253b1e..55958fb5b3 100644
--- a/faker.gemspec
+++ b/faker.gemspec
@@ -36,7 +36,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency('rubocop-minitest', '0.23.0')
   spec.add_development_dependency('rubocop-rake', '0.6.0')
   spec.add_development_dependency('simplecov', '0.21')
-  spec.add_development_dependency('test-unit', '3.5.5')
+  spec.add_development_dependency('test-unit', '3.5.7')
   spec.add_development_dependency('timecop', '0.9.5')
   spec.add_development_dependency('yard', '0.9.27')
 end