diff --git a/Gemfile.lock b/Gemfile.lock
index 262a9575b..5cca860f9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -181,7 +181,7 @@ GEM
       capybara
       minitest (~> 5.0)
       rake
-    mocha (1.15.0)
+    mocha (1.16.0)
     net-imap (0.3.1)
       net-protocol
     net-pop (0.1.2)