diff --git a/Gemfile.lock b/Gemfile.lock
index 6f76974..e4d68c4 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -63,6 +63,7 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.10.0)
+    concurrent-ruby (1.1.10)
     cucumber (1.3.20)
       builder (>= 2.1.2)
       diff-lcs (>= 1.1.3)
@@ -91,7 +92,8 @@ GEM
     globalid (0.3.6)
       activesupport (>= 4.1.0)
     hike (1.2.3)
-    i18n (0.7.0)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
     jbuilder (2.3.2)
       activesupport (>= 3.0.0, < 5)
       multi_json (~> 1.2)