diff --git a/.gitignore b/.gitignore
index f3f1ec1..5f54680 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,3 +5,4 @@ rdoc/
 Gemfile.lock
 spec/dummy/tmp
 spec/dummy/log
+gemfiles
diff --git a/Appraisals b/Appraisals
new file mode 100644
index 0000000..cfd86ba
--- /dev/null
+++ b/Appraisals
@@ -0,0 +1,7 @@
+appraise "prawn0.12.0" do
+  gem "prawn", '0.12.0'
+end
+
+appraise "prawn0.6.3" do
+  gem "prawn", '0.6.3'
+end 
diff --git a/Gemfile b/Gemfile
index 2940ed5..069c016 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,3 +6,4 @@ gemspec
 gem "spork", ">= 0.9.0"
 gem "rspec-rails"
 gem "mocha"
+gem "appraisal"
diff --git a/README.rdoc b/README.rdoc
index fb38c6d..6f973ee 100644
--- a/README.rdoc
+++ b/README.rdoc
@@ -78,6 +78,20 @@ Sometimes you need to be able to render a PDF from anywhere (Background process
 
 While layouts and partials aren't yet supported, helper methods can be called from within the PDF views. To help keep PDF's DRY, I would recommend creating a <code>PdfHelper</code> class for complex functionality. Don't forget to add this helper to your emailer if you generate PDF's as attachments.
 
+== Testing
+
+prawnto uses appraisal to run tests for different versions of prawn. In order to
+run the specs you first need to install the dependencies for each appraisal:
+  
+  rake appraisal:install
+
+Then you can run the tests for a specifc version of prawn (only 0.12.0 and 
+0.6.3, but you can add your own version) or all versions:
+
+  rake appraisal:prawn0.12.0 spec
+  rake appraisal:prawn0.6.3 spec
+  rake appraisal spec # all versions
+
 = Contributing & Reporting Issues
 
 Obviously, all code contributions are greatly appreciated. We also need help with testing and the wiki.
diff --git a/Rakefile b/Rakefile
index fa9ceca..0bea826 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,10 +1,12 @@
+require 'rubygems'
+require 'bundler/setup'
+
 require 'rake'
 require 'rake/testtask'
 require 'rdoc/task'
 require 'rubygems/package_task'
 
-desc 'Default: run unit tests.'
-task :default => :test
+require 'appraisal'
 
 desc 'Generate documentation for the prawnto plugin.'
 RDoc::Task.new do |rdoc|
@@ -15,9 +17,11 @@ RDoc::Task.new do |rdoc|
   rdoc.rdoc_files.include("README.rdoc", "lib/**/*.rb")
 end
 
-desc 'Test the prawnto gem'
-Rake::TestTask.new(:test) do |t|
-  t.libs << 'lib'
-  t.pattern = 'test/*_test.rb'
-  # t.verbose = true
+require 'rspec/core/rake_task'
+
+desc 'Default: run specs.'
+task :default => :spec
+
+desc "Run specs"
+RSpec::Core::RakeTask.new do |t|
 end
diff --git a/prawnto.gemspec b/prawnto.gemspec
index e701e94..c1312b4 100644
--- a/prawnto.gemspec
+++ b/prawnto.gemspec
@@ -15,7 +15,7 @@ Gem::Specification.new do |s|
   s.required_rubygems_version = ">= 1.3.6"
   s.platform = Gem::Platform::RUBY
   s.add_dependency('rails', '>= 3.1')
-  s.add_dependency('prawn', '>= 0.12.0')
+  s.add_dependency('prawn', '>= 0.6.0')
 
   s.files         = `git ls-files`.split("\n")
   s.test_files    = `git ls-files -- {test,spec,features}/*`.split("\n")
diff --git a/spec/assets/default_render.pdf b/spec/assets/default_render-0.12.0.pdf
similarity index 100%
rename from spec/assets/default_render.pdf
rename to spec/assets/default_render-0.12.0.pdf
diff --git a/spec/assets/default_render-0.6.3.pdf b/spec/assets/default_render-0.6.3.pdf
new file mode 100644
index 0000000..9dee929
Binary files /dev/null and b/spec/assets/default_render-0.6.3.pdf differ
diff --git a/spec/assets/dsl_render.pdf b/spec/assets/dsl_render-0.12.0.pdf
similarity index 100%
rename from spec/assets/dsl_render.pdf
rename to spec/assets/dsl_render-0.12.0.pdf
diff --git a/spec/assets/dsl_render-0.6.3.pdf b/spec/assets/dsl_render-0.6.3.pdf
new file mode 100644
index 0000000..cd6478e
Binary files /dev/null and b/spec/assets/dsl_render-0.6.3.pdf differ
diff --git a/spec/assets/yield_block_in_helper_test.pdf b/spec/assets/yield_block_in_helper_test-0.12.0.pdf
similarity index 100%
rename from spec/assets/yield_block_in_helper_test.pdf
rename to spec/assets/yield_block_in_helper_test-0.12.0.pdf
diff --git a/spec/assets/yield_block_in_helper_test-0.6.3.pdf b/spec/assets/yield_block_in_helper_test-0.6.3.pdf
new file mode 100644
index 0000000..7181de7
Binary files /dev/null and b/spec/assets/yield_block_in_helper_test-0.6.3.pdf differ
diff --git a/spec/integrations/super_model_spec.rb b/spec/integrations/super_model_spec.rb
index e6aa925..21bbb31 100644
--- a/spec/integrations/super_model_spec.rb
+++ b/spec/integrations/super_model_spec.rb
@@ -8,7 +8,7 @@
     end
     
     it do
-      asset_binary = File.open(TEST_ASSETS + "/default_render.pdf").read.bytes.to_a
+      asset_binary = File.open(asset_path('default_render')).read.bytes.to_a
       @model.to_pdf.bytes.to_a.should == asset_binary
     end
   end
diff --git a/spec/integrations/test_controller_spec.rb b/spec/integrations/test_controller_spec.rb
index cca6fde..1d82b80 100644
--- a/spec/integrations/test_controller_spec.rb
+++ b/spec/integrations/test_controller_spec.rb
@@ -7,7 +7,7 @@
       get "/default_render.pdf"
       response.should be_success
       
-      asset_binary = File.open(TEST_ASSETS + "/default_render.pdf").read.bytes.to_a
+      asset_binary = File.open(asset_path("default_render")).read.bytes.to_a
       body_binary = response.body.bytes.to_a
       body_binary.should == asset_binary
     end
@@ -19,7 +19,7 @@
     
     it "should render items in a block passed to a helper" do
       get "/yield_block_in_helper_test.pdf"
-      asset_binary = File.open(TEST_ASSETS + "/yield_block_in_helper_test.pdf").read.bytes.to_a
+      asset_binary = File.open(asset_path("yield_block_in_helper_test")).read.bytes.to_a
       body_binary = response.body.bytes.to_a
       body_binary.should == asset_binary
     end
@@ -31,10 +31,10 @@
       get "/dsl_render.pdf"
       response.should be_success
       
-      asset_binary = File.open(TEST_ASSETS + "/dsl_render.pdf").read.bytes.to_a
+      asset_binary = File.open(asset_path("dsl_render")).read.bytes.to_a
       body_binary = response.body.bytes.to_a
       body_binary.should == asset_binary
     end
   end
 
-end
\ No newline at end of file
+end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index d3c3f10..e09e9cd 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -27,3 +27,11 @@
   # This code will be run each time you run your specs.
 
 end
+
+# Helper to provide asset path given the "base name" of the file.
+# For example, if +file+ is "default_render", asset_path returns
+# "/path/to/prawnto/spec/assets/default_render-#{prawn version}.pdf"
+def asset_path(file)
+  prawn_version = Gem.loaded_specs["prawn"].version.to_s.inspect
+  TEST_ASSETS + "/#{file}-#{prawn_version.gsub('"','')}.pdf"
+end