diff --git a/rqrcode.gemspec b/rqrcode.gemspec
index 5b7fb35..d1dbc33 100644
--- a/rqrcode.gemspec
+++ b/rqrcode.gemspec
@@ -28,7 +28,7 @@ Gem::Specification.new do |spec|
   spec.required_ruby_version = ">= 2.3"
   spec.add_dependency "rqrcode_core", "~> 1.0"
   spec.add_dependency "chunky_png", "~> 1.0"
-  spec.add_development_dependency "bundler", ">= 2.0"
+  spec.add_development_dependency "bundler", "~> 2.0"
   spec.add_development_dependency "rake", "~> 13.0"
   spec.add_development_dependency "rspec", "~> 3.5"
   spec.add_development_dependency "standardrb", "~> 1.0"