diff --git a/Gemfile.lock b/Gemfile.lock
index f9d109c..2dd0884 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -26,7 +26,7 @@ GEM
     ast (2.4.3)
     base64 (0.3.0)
     bigdecimal (4.0.1)
-    concurrent-ruby (1.3.6)
+    concurrent-ruby (1.3.7)
     connection_pool (3.0.2)
     contracts (0.17.3)
     crack (1.0.1)
diff --git a/vendor/cache/concurrent-ruby-1.3.6.gem b/vendor/cache/concurrent-ruby-1.3.6.gem
deleted file mode 100644
index 5689df5..0000000
Binary files a/vendor/cache/concurrent-ruby-1.3.6.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