diff --git a/Gemfile.lock b/Gemfile.lock
index 19089e68..71ab011a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -27,6 +27,7 @@ GEM
   remote: http://rubygems.org/
   specs:
     blankslate (2.1.2.4)
+    concurrent-ruby (1.1.10)
     diff-lcs (1.2.4)
     file-tail (1.0.12)
       tins (~> 0.5)
@@ -77,7 +78,8 @@ GEM
       sexp_processor (>= 3.0.5)
     tilt (1.4.1)
     tins (0.8.0)
-    tzinfo (0.3.37)
+    tzinfo (2.0.5)
+      concurrent-ruby (~> 1.0)
     webrat (0.7.3)
       nokogiri (>= 1.2.0)
       rack (>= 1.0)