diff --git a/lib/rack/uri_sanitizer.rb b/lib/rack/uri_sanitizer.rb
index 5c80e40..92c11d8 100644
--- a/lib/rack/uri_sanitizer.rb
+++ b/lib/rack/uri_sanitizer.rb
@@ -11,6 +11,12 @@ def call(env)
         env['QUERY_STRING'] = env['QUERY_STRING'].gsub(/%(?![0-9a-fA-F]{2})/, '%25')
       end
 
+      if env['REQUEST_METHOD'] == 'POST'
+        rack_input = env['rack.input'].read
+        unless /\A(?:%[0-9a-fA-F]{2}|[^%])*\z/ =~ rack_input
+          env['rack.input'] = StringIO.new(rack_input.gsub(/%(?![0-9a-fA-F]{2})/, '%25'))
+        end
+      end
       @app.call(env)
     end
   end
diff --git a/lib/rack/uri_sanitizer/version.rb b/lib/rack/uri_sanitizer/version.rb
index fd7842d..cacd8c4 100644
--- a/lib/rack/uri_sanitizer/version.rb
+++ b/lib/rack/uri_sanitizer/version.rb
@@ -1,5 +1,5 @@
 module Rack
   class URISanitizer
-    VERSION = "0.0.2"
+    VERSION = "0.1.0"
   end
 end