Depend on new i18n gem, silence deprecation warning

middleman-core/lib/middleman-core/application.rb

@@ -4,6 +4,10 @@ require "tilt"
 # i18n Built-in
 require "i18n"
 
+# Don't fail on invalid locale, that's not what our current
+# users expect.
+::I18n.config.enforce_available_locales = false
+
 # Use ActiveSupport JSON
 require "active_support/json"
 require "active_support/core_ext/integer/inflections"

middleman-core/middleman-core.gemspec

@@ -36,5 +36,5 @@ Gem::Specification.new do |s|
   s.add_dependency("listen", ["~> 1.1"])
 
   # i18n
-  s.add_dependency("i18n", ["~> 0.6.1"])
+  s.add_dependency("i18n", ["~> 0.6.9"])
 end