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diff --git a/lib/bundler/capistrano.rb b/lib/bundler/capistrano.rb
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+++ b/lib/bundler/capistrano.rb
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+# frozen_string_literal: true
+# Capistrano task for Bundler.
+#
+# Add "require 'bundler/capistrano'" in your Capistrano deploy.rb, and
+# Bundler will be activated after each new deployment.
+require "bundler/deployment"
+require "capistrano/version"
+
+if defined?(Capistrano::Version) && Gem::Version.new(Capistrano::Version).release >= Gem::Version.new("3.0")
+  raise "For Capistrano 3.x integration, please use http://github.com/capistrano/bundler"
+end
+
+Capistrano::Configuration.instance(:must_exist).load do
+  before "deploy:finalize_update", "bundle:install"
+  Bundler::Deployment.define_task(self, :task, :except => { :no_release => true })
+  set :rake, lambda { "#{fetch(:bundle_cmd, "bundle")} exec rake" }
+end