diff --git a/Gemfile b/Gemfile
index 8a6112057..f58c9e397 100644
--- a/Gemfile
+++ b/Gemfile
@@ -51,7 +51,6 @@ gem 'twitter-bootstrap-rails'
 gem 'uglifier', '>= 1.3.0'
 gem 'webpacker', '~> 4'
 gem 'whenever', require: false
-gem 'xray-rails'
 gem 'yard'
 
 group :development, :test do
@@ -96,6 +95,7 @@ group :development do
   # Access an IRB console on exception pages or by using <%= console %> anywhere
   # in the code.
   gem 'web-console', '>= 3.3.0'
+  gem 'xray-rails'
 end
 
 extra_gems = "/opt/laevigata/shared/Gemfile.local"
diff --git a/config/initializers/explain_partials.rb b/config/initializers/explain_partials.rb
deleted file mode 100644
index 58329f09f..000000000
--- a/config/initializers/explain_partials.rb
+++ /dev/null
@@ -1,16 +0,0 @@
-# Start the app with EXPLAIN_PARTIALS=true to show locations of view partials
-if Rails.env.development? and ENV['EXPLAIN_PARTIALS']
-  module ActionView
-    class PartialRenderer
-      def render_with_explanation(*args)
-        rendered = render_without_explanation(*args).to_s
-        # Note: We haven't figured out how to get a path when @template is nil.
-        start_explanation = "\n<!-- START PARTIAL #{@template.inspect} -->\n"
-        end_explanation = "\n<!-- END PARTIAL #{@template.inspect} -->\n"
-        start_explanation.html_safe + rendered + end_explanation.html_safe
-      end
-
-      alias_method_chain :render, :explanation
-    end
-  end
-end