diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index cd56838..1a2c194 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -17,7 +17,7 @@ jobs:
     strategy:
       matrix:
         platform: [ubuntu-latest, windows-latest]
-        ruby: ["2.5", "2.6", "2.7", "3.0"]
+        ruby: ["2.5", "2.6", "2.7", "3.0", "head"]
     runs-on: ${{ matrix.platform }}
     steps:
       - name: configure git crlf on windows
diff --git a/mini_portile2.gemspec b/mini_portile2.gemspec
index ce41c99..7dcfa1b 100644
--- a/mini_portile2.gemspec
+++ b/mini_portile2.gemspec
@@ -31,12 +31,14 @@ Gem::Specification.new do |spec|
   spec.test_files = spec.files.grep(%r{^(test|spec|features|examples)/})
   spec.require_paths = ["lib"]
 
+  spec.required_ruby_version = ">= 2.3.0"
+
+  spec.add_dependency "net-ftp", "~> 0.1"
+
   spec.add_development_dependency "bundler", "~> 2.1"
   spec.add_development_dependency "minitar", "~> 0.7"
   spec.add_development_dependency "minitest", "~> 5.11"
   spec.add_development_dependency "minitest-hooks", "~> 1.5.0"
   spec.add_development_dependency "rake", "~> 13.0"
   spec.add_development_dependency "webrick", "~> 1.0"
-
-  spec.required_ruby_version = ">= 2.3.0"
 end