msgpack_rails.gemspec in msgpack_rails-0.1.0 vs msgpack_rails.gemspec in msgpack_rails-0.3.0

@@ -17,8 +17,11 @@
   spec.executables   = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ["lib"]
 
   spec.add_runtime_dependency "activesupport", ">= 3.0"
-  spec.add_runtime_dependency "activemodel", ">= 3.0"
-  spec.add_runtime_dependency "msgpack"
+  if RUBY_ENGINE == "jruby"
+    spec.add_runtime_dependency "msgpack-jruby"
+  else
+    spec.add_runtime_dependency "msgpack"
+  end
 end