diff --git a/holidays.gemspec b/holidays.gemspec
index 9973f56..6cb6e04 100644
--- a/holidays.gemspec
+++ b/holidays.gemspec
@@ -19,6 +19,7 @@ Gem::Specification.new do |s|
   s.files = [
     ".travis.yml",
     "CHANGELOG",
+    "Gemfile",
     "LICENSE",
     "README.rdoc",
     "REFERENCES",
@@ -136,13 +137,16 @@ Gem::Specification.new do |s|
     if Gem::Version.new(Gem::VERSION) >= Gem::Version.new('1.2.0') then
       s.add_runtime_dependency(%q<holidays>, [">= 0"])
       s.add_development_dependency(%q<rake>, [">= 2.4.2"])
+      s.add_development_dependency(%q<rdoc>, [">= 2.4.2"])
     else
       s.add_dependency(%q<holidays>, [">= 0"])
       s.add_dependency(%q<rake>, [">= 2.4.2"])
+      s.add_dependency(%q<rdoc>, [">= 2.4.2"])
     end
   else
     s.add_dependency(%q<holidays>, [">= 0"])
     s.add_dependency(%q<rake>, [">= 2.4.2"])
+    s.add_dependency(%q<rdoc>, [">= 2.4.2"])
   end
 end