vendor/bundle/bin/rackup in tdiary-5.0.5 vs vendor/bundle/bin/rackup in tdiary-5.0.6

@@ -17,6 +17,11 @@
     version = $1
     ARGV.shift
   end
 end
 
+if Gem.respond_to?(:activate_bin_path)
 load Gem.activate_bin_path('rack', 'rackup', version)
+else
+gem "rack", version
+load Gem.bin_path("rack", "rackup", version)
+end