diff --git a/Gemfile.lock b/Gemfile.lock
index eea3328..060ca9a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -28,7 +28,7 @@ GEM
     base64 (0.3.0)
     benchmark (0.4.1)
     bigdecimal (3.2.3)
-    concurrent-ruby (1.3.5)
+    concurrent-ruby (1.3.6)
     connection_pool (2.5.4)
     diff-lcs (1.6.2)
     docile (1.4.1)
@@ -166,7 +166,7 @@ CHECKSUMS
   base64 (0.3.0) sha256=27337aeabad6ffae05c265c450490628ef3ebd4b67be58257393227588f5a97b
   benchmark (0.4.1) sha256=d4ef40037bba27f03b28013e219b950b82bace296549ec15a78016552f8d2cce
   bigdecimal (3.2.3) sha256=ffd11d1ac67a0d3b2f44aec0a6487210b3f813f363dd11f1fcccf5ba00da4e1b
-  concurrent-ruby (1.3.5) sha256=813b3e37aca6df2a21a3b9f1d497f8cbab24a2b94cab325bffe65ee0f6cbebc6
+  concurrent-ruby (1.3.6) sha256=6b56837e1e7e5292f9864f34b69c5a2cbc75c0cf5338f1ce9903d10fa762d5ab
   connection_pool (2.5.4) sha256=e9e1922327416091f3f6542f5f4446c2a20745276b9aa796dd0bb2fd0ea1e70a
   diff-lcs (1.6.2) sha256=9ae0d2cba7d4df3075fe8cd8602a8604993efc0dfa934cff568969efb1909962
   docile (1.4.1) sha256=96159be799bfa73cdb721b840e9802126e4e03dfc26863db73647204c727f21e