Gemfile in instrumental_agent-2.1.0 vs Gemfile in instrumental_agent-3.0.0.alpha

@@ -1,11 +1,6 @@
 source "https://rubygems.org"
 
 gemspec
-ruby_engine = defined?(RUBY_ENGINE) && RUBY_ENGINE
-if RUBY_VERSION < "1.9" && !%w{jruby rbx}.include?(ruby_engine)
-  # Built and installed via ext/mkrf_conf.rb
-  gem 'system_timer', '~> 1.2'
-end
 
 # fixes 2.3.0 ffi bundle error
-gem 'ffi', '~> 1.0.11'
\ No newline at end of file
+gem 'ffi', '~> 1.0.11'