diff --git a/Gemfile.lock b/Gemfile.lock
index d5aa7ca..9c39150 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -8,6 +8,7 @@ GEM
       thread_safe (~> 0.1)
       tzinfo (~> 1.1)
     columnize (0.8.9)
+    concurrent-ruby (1.1.10)
     debugger (1.6.8)
       columnize (>= 0.3.1)
       debugger-linecache (~> 1.2.0)
@@ -15,7 +16,8 @@ GEM
     debugger-linecache (1.2.0)
     debugger-ruby_core_source (1.3.7)
     diff-lcs (1.2.5)
-    i18n (0.6.11)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
     json (1.8.1)
     mime-types (2.4.3)
     minitest (5.4.3)