Trouble with a corrupt gemfile in production?

Gemfile

@@ -5,6 +5,9 @@ git_source(:github) do |repo_name|
   "https://github.com/#{repo_name}.git"
 end
 
+# Necessary for an unknown reason in production
+gem 'mini_portile2'
+
 # The central piece of this application: the month calendar view
 gem 'simple_calendar'
 # The recurrence management library

Gemfile.lock

@@ -241,6 +241,7 @@ GEM
       actionpack (>= 3.2.0, < 5.3)
     method_source (0.9.0)
     mini_mime (1.0.0)
+    mini_portile2 (2.3.0)
     minitest (5.11.1)
     modernizr-rails (2.7.1)
     multi_json (1.13.1)
@@ -465,6 +466,7 @@ DEPENDENCIES
   kramdown
   listen (>= 3.0.5, < 3.2)
   meta-tags
+  mini_portile2
   modernizr-rails
   mysql2
   paper_trail