diff --git a/mutant.gemspec b/mutant.gemspec
index b4129cf7..9daf20d5 100644
--- a/mutant.gemspec
+++ b/mutant.gemspec
@@ -16,7 +16,7 @@ Gem::Specification.new do |gem|
   gem.extra_rdoc_files = %w[TODO LICENSE]
   gem.executables       = [ 'mutant' ]
 
-  gem.add_runtime_dependency('parser',              '~> 2.0.beta4')
+  gem.add_runtime_dependency('parser',              '~> 2.0.beta5')
   gem.add_runtime_dependency('unparser',            '~> 0.0.1')
   gem.add_runtime_dependency('ice_nine',            '~> 0.7.0')
   gem.add_runtime_dependency('descendants_tracker', '~> 0.0.1')