diff --git a/opic.gemspec b/opic.gemspec
index d0b9a44..8b7a652 100644
--- a/opic.gemspec
+++ b/opic.gemspec
@@ -19,7 +19,7 @@ Gem::Specification.new do |spec|
 
   spec.add_runtime_dependency "rest-client"
 
-  spec.add_development_dependency "bundler", "~> 1.3"
+  spec.add_development_dependency "bundler", "~> 2.1"
   spec.add_development_dependency "pry"
   spec.add_development_dependency "rspec"
   spec.add_development_dependency "rake"