diff --git a/lib/puma/acme.rb b/lib/puma/acme.rb
index faf372a..02f6bd3 100644
--- a/lib/puma/acme.rb
+++ b/lib/puma/acme.rb
@@ -6,7 +6,6 @@
 require 'puma'
 require 'puma/binder'
 require 'puma/plugin'
-require 'sinatra'
 
 module Puma
   # This is a plugin for Puma that will automatically provision a SSL
diff --git a/puma-acme.gemspec b/puma-acme.gemspec
index d6925b3..1ab6a9c 100644
--- a/puma-acme.gemspec
+++ b/puma-acme.gemspec
@@ -24,7 +24,6 @@ Gem::Specification.new do |s|
   s.add_runtime_dependency 'acme-client', '~> 2.0.13'
   s.add_runtime_dependency 'pstore', '~> 0.1'
   s.add_runtime_dependency 'puma', '~> 6.0'
-  s.add_runtime_dependency 'sinatra', '>= 3.2'
 
   s.add_development_dependency 'http.rb', '~> 0.12'
   s.add_development_dependency 'minitest', '~> 5.14'