diff --git a/spec/dummy4/Gemfile.lock b/spec/dummy4/Gemfile.lock
index bc0019d5..24b00573 100644
--- a/spec/dummy4/Gemfile.lock
+++ b/spec/dummy4/Gemfile.lock
@@ -81,6 +81,7 @@ GEM
       execjs
     coffee-script-source (1.9.1.1)
     columnize (0.9.0)
+    concurrent-ruby (1.1.10)
     database_cleaner (1.5.0)
     debase (0.2.1)
       debase-ruby_core_source
@@ -116,7 +117,8 @@ GEM
       rspec (>= 2.99.0, < 4.0)
     http-cookie (1.0.2)
       domain_name (~> 0.5)
-    i18n (0.7.0)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
     jbuilder (2.3.1)
       activesupport (>= 3.0.0, < 5)
       multi_json (~> 1.2)