diff --git a/Gemfile b/Gemfile
index c89ba40b20..20c4e16785 100644
--- a/Gemfile
+++ b/Gemfile
@@ -14,5 +14,5 @@ gem 'rubocop-minitest', '0.35.0'
 gem 'rubocop-rake', '0.6.0'
 gem 'simplecov', '0.22.0'
 gem 'test-unit', '3.6.2'
-gem 'timecop', '0.9.9'
+gem 'timecop', '0.9.10'
 gem 'yard', '0.9.36'
diff --git a/Gemfile.lock b/Gemfile.lock
index b66478f38e..d7d3bef42a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -60,7 +60,7 @@ GEM
     strscan (3.1.0)
     test-unit (3.6.2)
       power_assert
-    timecop (0.9.9)
+    timecop (0.9.10)
     unicode-display_width (2.5.0)
     yard (0.9.36)
 
@@ -79,7 +79,7 @@ DEPENDENCIES
   rubocop-rake (= 0.6.0)
   simplecov (= 0.22.0)
   test-unit (= 3.6.2)
-  timecop (= 0.9.9)
+  timecop (= 0.9.10)
   yard (= 0.9.36)
 
 BUNDLED WITH