diff --git a/capsicum.gemspec b/capsicum.gemspec
index 8dfc1b5..eb5aeb6 100644
--- a/capsicum.gemspec
+++ b/capsicum.gemspec
@@ -29,7 +29,7 @@ Gem::Specification.new do |spec|
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
 
-  spec.add_development_dependency "bundler", "~> 1.14"
+  spec.add_development_dependency "bundler", "~> 2.5"
   spec.add_development_dependency "rake", "~> 10.0"
   spec.add_development_dependency "minitest", "~> 5.0"
 end