diff --git a/garth-jekyll-theme.gemspec b/garth-jekyll-theme.gemspec
index 3cf0537..121f4cb 100644
--- a/garth-jekyll-theme.gemspec
+++ b/garth-jekyll-theme.gemspec
@@ -1,11 +1,19 @@
-Gem::Specification.new do |s|
-  s.name     = 'garth-jekyll-theme'
-  s.version  = '0.2.8'
-  s.license  = 'MIT'
-  s.summary  = 'A stupidly simple theme for Jekyll (3.2)'
-  s.description  = 'A stupidly simple theme for Jekyll (3.2), using official Jekyll theme implementation'
-  s.author   = 'David Darnes'
-  s.email    = 'me@daviddarnes.com'
-  s.homepage = 'https://github.com/daviddarnes/garth-jekyll-theme'
-  s.files    = `git ls-files -z`.split("\x0").grep(%r{^_(sass|includes|layouts)/})
+# coding: utf-8
+
+Gem::Specification.new do |spec|
+  spec.name          = "garth-jekyll-theme"
+  spec.version       = "0.2.9"
+  spec.authors       = ["David Darnes"]
+  spec.email         = ["me@daviddarnes.com"]
+
+  spec.summary       = "A stupidly simple theme for Jekyll (3.2)"
+  spec.homepage      = "https://github.com/daviddarnes/garth-jekyll-theme"
+  spec.license       = "MIT"
+
+  spec.files         = `git ls-files -z`.split("\x0").select { |f| f.match(%r{^(_layouts|_includes|_sass|LICENSE|README)/i}) }
+
+  spec.add_runtime_dependency "jekyll", "~> 3.2"
+
+  spec.add_development_dependency "jekyll", "~> 3.2"
+  spec.add_development_dependency "bundler", "~> 1.12"
 end