middleman-webp.gemspec in middleman-webp-0.3.1 vs middleman-webp.gemspec in middleman-webp-0.3.2

@@ -16,10 +16,10 @@
   spec.files         = `git ls-files`.split($/)
   spec.executables   = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ["lib"]
 
-  spec.add_dependency "middleman-core", "~> 3.4.0"
+  spec.add_dependency "middleman-core", ">= 3.3.0", "< 3.5.0"
 
   spec.add_development_dependency "bundler", "~> 1.5"
   spec.add_development_dependency "rake"
   #spec.add_development_dependency "simplecov"
   spec.add_development_dependency "mocha"