Rakefile in win32screenshot-0.0.7 vs Rakefile in win32screenshot-0.0.8

@@ -14,10 +14,10 @@
     gem.homepage = "http://github.com/jarmo/win32screenshot"
     gem.authors = ["Jarmo Pertman", "Aslak Hellesøy"]
 
     gem.rdoc_options = ["--main", "README.rdoc"]
 
-    gem.add_dependency "ffi"
+    gem.add_dependency "ffi", "~>0"
 
     gem.add_development_dependency "rspec", ">= 1.2.9"
     gem.add_development_dependency 'os'
     if OS.java?
       gem.add_development_dependency "rmagick4j"
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