diff --git a/seven-zip.gemspec b/seven-zip.gemspec
index 548e945..6fb06e1 100644
--- a/seven-zip.gemspec
+++ b/seven-zip.gemspec
@@ -20,7 +20,7 @@ Gem::Specification.new do |spec|
 
   spec.required_ruby_version = '>= 2.3.0'
 
-  spec.add_development_dependency "bundler", "~> 2"
+  spec.add_development_dependency "bundler"
   spec.add_development_dependency "rake", "~> 13"
   spec.add_development_dependency "rspec", "~> 3"