diff --git a/.gitignore b/.gitignore
index fedf1b5..8f5ed9c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,4 @@ coverage
 rdoc
 pkg
 *~
+Gemfile.lock
diff --git a/Gemfile b/Gemfile
new file mode 100644
index 0000000..a1b93f3
--- /dev/null
+++ b/Gemfile
@@ -0,0 +1,3 @@
+source :rubygems
+
+gemspec
diff --git a/sinatra-url-for.gemspec b/sinatra-url-for.gemspec
index cc23c5a..7ae9a1e 100644
--- a/sinatra-url-for.gemspec
+++ b/sinatra-url-for.gemspec
@@ -23,7 +23,8 @@ Gem::Specification.new do |s|
 
     if Gem::Version.new(Gem::RubyGemsVersion) >= Gem::Version.new('1.2.0') then
       s.add_runtime_dependency(%q<sinatra>, [">= 0.9.1.1"])
-      s.add_development_dependency(%q<rspec>, [">= 1.1.11"])
+      s.add_development_dependency(%q<rspec>, ["~> 1.1.11"])
+      s.add_development_dependency(%q<jeweler>)
     else
       s.add_dependency(%q<sinatra>, [">= 0.9.1.1"])
       s.add_dependency(%q<rspec>, [">= 1.1.11"])