diff --git a/.gemspec b/.gemspec
index e38aab9..3a47718 100644
--- a/.gemspec
+++ b/.gemspec
@@ -32,6 +32,8 @@ Gem::Specification.new do |gem|
   gem.requirements               = ['GnuPG >= 1.4.7 (not required, but enables extra functionality)']
   gem.add_development_dependency 'yard' , '>= 0.5.8'
   gem.add_development_dependency 'rspec', '>= 1.3.0'
+  gem.add_development_dependency 'pry'
   gem.add_runtime_dependency     'open4', '>= 1.0.1'
+
   gem.post_install_message       = nil
 end
diff --git a/Gemfile b/Gemfile
new file mode 100644
index 0000000..851fabc
--- /dev/null
+++ b/Gemfile
@@ -0,0 +1,2 @@
+source 'https://rubygems.org'
+gemspec
diff --git a/Gemfile.lock b/Gemfile.lock
new file mode 100644
index 0000000..9f91e07
--- /dev/null
+++ b/Gemfile.lock
@@ -0,0 +1,44 @@
+PATH
+  remote: .
+  specs:
+    openpgp (0.0.3)
+      open4 (>= 1.0.1)
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    coderay (1.1.3)
+    diff-lcs (1.5.0)
+    method_source (1.0.0)
+    open4 (1.3.4)
+    pry (0.14.2)
+      coderay (~> 1.1)
+      method_source (~> 1.0)
+    rspec (3.11.0)
+      rspec-core (~> 3.11.0)
+      rspec-expectations (~> 3.11.0)
+      rspec-mocks (~> 3.11.0)
+    rspec-core (3.11.0)
+      rspec-support (~> 3.11.0)
+    rspec-expectations (3.11.1)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.11.0)
+    rspec-mocks (3.11.1)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.11.0)
+    rspec-support (3.11.1)
+    webrick (1.7.0)
+    yard (0.9.28)
+      webrick (~> 1.7.0)
+
+PLATFORMS
+  x86_64-linux
+
+DEPENDENCIES
+  openpgp!
+  pry
+  rspec (>= 1.3.0)
+  yard (>= 0.5.8)
+
+BUNDLED WITH
+   2.3.24