diff --git a/parser.gemspec b/parser.gemspec
index cc4d35f8b..f42d8f55c 100644
--- a/parser.gemspec
+++ b/parser.gemspec
@@ -30,7 +30,7 @@ Gem::Specification.new do |spec|
 
   spec.add_development_dependency 'bundler',   '>= 1.15', '< 3.0.0'
   spec.add_development_dependency 'rake',      '~> 13.0.1'
-  spec.add_development_dependency 'racc',      '= 1.6.0'
+  spec.add_development_dependency 'racc',      '= 1.6.1'
   spec.add_development_dependency 'cliver',    '~> 0.3.2'
 
   spec.add_development_dependency 'yard'