diff --git a/spec/dummy/Gemfile.lock b/spec/dummy/Gemfile.lock
index 4fe32805..78b10143 100644
--- a/spec/dummy/Gemfile.lock
+++ b/spec/dummy/Gemfile.lock
@@ -61,6 +61,7 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.9.1.1)
+    concurrent-ruby (1.1.10)
     database_cleaner (1.4.1)
     diff-lcs (1.2.5)
     domain_name (0.5.24)
@@ -91,7 +92,8 @@ GEM
     hike (1.2.3)
     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)