diff --git a/Gemfile.lock b/Gemfile.lock
index c7aa1e1..3e7f379 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,7 +2,7 @@ PATH
   remote: .
   specs:
     jenkins (0.6.2)
-      builder (>= 2.1.2)
+      builder (~> 2.1.2)
       hpricot
       httparty (~> 0.6.1)
       json (>= 1.4.6)
@@ -13,7 +13,7 @@ GEM
   remote: http://rubygems.org/
   specs:
     awesome_print (0.3.2)
-    builder (3.0.0)
+    builder (2.1.2)
     crack (0.1.8)
     cucumber (0.10.0)
       builder (>= 2.1.2)
diff --git a/jenkins.gemspec b/jenkins.gemspec
index 8a0184e..fe5b879 100644
--- a/jenkins.gemspec
+++ b/jenkins.gemspec
@@ -21,7 +21,7 @@ Gem::Specification.new do |s|
 
   s.add_dependency("term-ansicolor", [">= 1.0.4"])
   s.add_dependency("httparty", ["~> 0.6.1"])
-  s.add_dependency("builder", [">= 2.1.2"])
+  s.add_dependency("builder", ["~> 2.1.2"])
   s.add_dependency("thor", ["~> 0.14.2"])
   s.add_dependency("hpricot")
   s.add_dependency("json", ">= 1.4.6")
diff --git a/lib/jenkins/api.rb b/lib/jenkins/api.rb
index 89cd598..57dad72 100644
--- a/lib/jenkins/api.rb
+++ b/lib/jenkins/api.rb
@@ -204,10 +204,16 @@ def self.delete_node(name)
     end
 
     # Helper for POST that don't barf at Jenkins's crappy API responses
-    def self.post_plain(path, options = {})
+    def self.post_plain(path, data = "", options = {})
       options = options.with_clean_keys
       uri = URI.parse base_uri
-      res = Net::HTTP.start(uri.host, uri.port) { |http| http.post(path, options) }
+      res = Net::HTTP.start(uri.host, uri.port) do |http| 
+        if RUBY_VERSION =~ /1.8/
+          http.post(path, options)
+        else
+          http.post(path, data, options)
+        end
+      end
     end
     
     # Helper for GET that don't barf at Jenkins's crappy API responses