diff --git a/Gemfile.lock b/Gemfile.lock
index e0d32c7..ae006ae 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -92,7 +92,7 @@ GEM
     builder (3.2.4)
     chronic_duration (0.10.6)
       numerizer (~> 0.1.1)
-    concurrent-ruby (1.2.3)
+    concurrent-ruby (1.3.1)
     connection_pool (2.4.1)
     counter_culture (3.5.3)
       activerecord (>= 4.2)