diff --git a/Gemfile b/Gemfile
index 451ddcd..58e84bd 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,7 +3,7 @@
 source 'https://rubygems.org'
 
 group :development do
-  gem 'rspec', '~> 3.5.0'
+  gem 'rspec', '~> 3.8.0'
 end
 
 group :test do
diff --git a/underpass.gemspec b/underpass.gemspec
index 93dbaae..edf88b8 100644
--- a/underpass.gemspec
+++ b/underpass.gemspec
@@ -32,6 +32,6 @@ Gem::Specification.new do |s|
 
   s.add_runtime_dependency 'rgeo', '~> 2.0', '>= 2.0.0'
 
-  s.add_development_dependency 'rspec', '~> 3.5', '>= 3.5.0'
+  s.add_development_dependency 'rspec', '~> 3.8', '>= 3.8.0'
   s.add_development_dependency 'simplecov', '~> 0.16.0'
 end