actionpack-action_caching was released a long time ago

Gemfile

@@ -71,11 +71,11 @@ gem 'seed-fu', '~> 2.3.3'
 
 if rails_master?
   gem 'rails', git: 'https://github.com/rails/rails.git'
-  gem 'actionpack-action_caching', git: 'https://github.com/rails/actionpack-action_caching.git'
 else
   gem 'rails'
-  gem 'actionpack-action_caching'
 end
+
+gem 'actionpack-action_caching'
 gem 'rails-observers'
 
 # Rails 4.1.6+ will relax the mail gem version requirement to `~> 2.5, >= 2.5.4`.

Gemfile_master.lock

@@ -1,10 +1,3 @@
-GIT
-  remote: https://github.com/rails/actionpack-action_caching.git
-  revision: a9f3f09477b12b51faa6756005eee4103f7f4030
-  specs:
-    actionpack-action_caching (1.1.0)
-      actionpack (>= 4.0.0, < 5.0)
-
 GIT
   remote: https://github.com/rails/rails.git
   revision: aa6637d140c2ebd28bbd23fc250af033a065dbe8
@@ -79,6 +72,8 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
+    actionpack-action_caching (1.1.1)
+      actionpack (>= 4.0.0, < 5.0)
     active_model_serializers (0.8.2)
       activemodel (>= 3.0)
     addressable (2.3.6)
@@ -441,7 +436,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  actionpack-action_caching!
+  actionpack-action_caching
   active_model_serializers (~> 0.8.0)
   annotate
   barber