diff --git a/Gemfile.lock b/Gemfile.lock
index 54b84e6..8a70403 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -30,7 +30,7 @@ GEM
     base64 (0.3.0)
     benchmark (0.4.1)
     bigdecimal (4.0.1)
-    concurrent-ruby (1.3.5)
+    concurrent-ruby (1.3.7)
     connection_pool (2.5.3)
     contracts (0.17.3)
     crack (1.0.1)
diff --git a/vendor/cache/concurrent-ruby-1.3.5.gem b/vendor/cache/concurrent-ruby-1.3.5.gem
deleted file mode 100644
index 1cd9f52..0000000
Binary files a/vendor/cache/concurrent-ruby-1.3.5.gem and /dev/null differ
diff --git a/vendor/cache/concurrent-ruby-1.3.7.gem b/vendor/cache/concurrent-ruby-1.3.7.gem
new file mode 100644
index 0000000..d7df695
Binary files /dev/null and b/vendor/cache/concurrent-ruby-1.3.7.gem differ