Require plugins from Gemfile :jekyll_plugins group.

bin/jekyll

@@ -13,6 +13,8 @@ require 'mercenary'
   end
 end
 
+Jekyll::PluginManager.require_from_bundler
+
 Jekyll::Deprecator.process(ARGV)
 
 Mercenary.program(:jekyll) do |p|

lib/jekyll/plugin_manager.rb

@@ -17,7 +17,7 @@ module Jekyll
     def conscientious_require
       require_plugin_files
       require_gems
-      require_from_bundler
+      self.require_from_bundler
     end
 
     # Require each of the gem plugins specified.
@@ -31,10 +31,11 @@ module Jekyll
       end
     end
 
-    def require_from_bundler
-      unless site.safe
+    def self.require_from_bundler
+      unless ENV["JEKYLL_NO_BUNDLER_REQUIRE"]
         require "bundler/setup"
         Bundler.require(:jekyll_plugins)
+        ENV["JEKYLL_NO_BUNDLER_REQUIRE"] = true
       end
     rescue LoadError
       false