diff --git a/bin/brakeman b/bin/brakeman
index 6419928cfd9bb7e8db97a6f93b329b95af88f946..9300c9bb07c54e0b3742b1f4ba83bf57698bd0de 100755
--- a/bin/brakeman
+++ b/bin/brakeman
@@ -54,7 +54,8 @@ end
 
 if options[:previous_results_json]
   vulns = Brakeman.compare options.merge(:quiet => options[:quiet])
-  puts JSON.pretty_generate(vulns)
+  puts MultiJson.dump(vulns, :pretty => true)
+
   if options[:exit_on_warn] and (vulns[:new].count + vulns[:fixed].count > 0)
     exit Brakeman::Warnings_Found_Exit_Code
   end
diff --git a/brakeman.gemspec b/brakeman.gemspec
index 5356e6d10b1976323d5939d24745fdb747280f53..d32e7e00ce536ff1a7bf09196057d1006ea0adef 100644
--- a/brakeman.gemspec
+++ b/brakeman.gemspec
@@ -19,5 +19,5 @@ Gem::Specification.new do |s|
   s.add_dependency "erubis", "~>2.6"
   s.add_dependency "haml", "~>3.0"
   s.add_dependency "sass", "~>3.0"
-  s.add_dependency "json_pure"
+  s.add_dependency "multi_json"
 end
diff --git a/lib/brakeman.rb b/lib/brakeman.rb
index 50ddaef6ac853197d2eb2113fba71e0a6f433990..5b4be4df8454aaccd6fb3eaf1b34c23ff0f10338 100644
--- a/lib/brakeman.rb
+++ b/lib/brakeman.rb
@@ -316,19 +316,20 @@ module Brakeman
 
   # Compare JSON ouptut from a previous scan and return the diff of the two scans
   def self.compare options
-    require 'json'
+    require 'multi_json'
     require 'brakeman/differ'
     raise ArgumentError.new("Comparison file doesn't exist") unless File.exists? options[:previous_results_json]
 
     begin
-      previous_results = JSON.parse(File.read(options[:previous_results_json]), :symbolize_names =>true)[:warnings]
-    rescue JSON::ParserError
+      previous_results = MultiJson.load(File.read(options[:previous_results_json]), :symbolize_keys => true)[:warnings]
+    rescue MultiJson::DecodeError
       self.notify "Error parsing comparison file: #{options[:previous_results_json]}"
       exit!
     end
 
     tracker = run(options)
-    new_results = JSON.parse(tracker.report.to_json, :symbolize_names =>true)[:warnings]
+
+    new_results = MultiJson.load(tracker.report.to_json, :symbolize_keys => true)[:warnings]
 
     Brakeman::Differ.new(new_results, previous_results).diff
   end
diff --git a/lib/brakeman/report.rb b/lib/brakeman/report.rb
index bfc7fb243430663559a6202b4f7c95c9ac7a7cff..409566ce1edcb1aeabdcc34a7ca8aa7b186d4231 100644
--- a/lib/brakeman/report.rb
+++ b/lib/brakeman/report.rb
@@ -6,6 +6,7 @@ require 'brakeman/util'
 require 'terminal-table'
 require 'highline/system_extensions'
 require "csv"
+require 'multi_json'
 require 'brakeman/version'
 
 if CSV.const_defined? :Reader
@@ -647,8 +648,6 @@ class Brakeman::Report
   end
 
   def to_json
-    require 'json'
-
     errors = tracker.errors.map{|e| { :error => e[:error], :location => e[:backtrace][0] }}
     app_path = tracker.options[:app_path]
 
@@ -672,11 +671,11 @@ class Brakeman::Report
       :brakeman_version => Brakeman::Version
     }
 
-    JSON.pretty_generate({
+    MultiJson.dump({
       :scan_info => scan_info,
       :warnings => warnings,
       :errors => errors
-    })
+    }, :pretty => true)
   end
 
   def all_warnings
diff --git a/lib/brakeman/warning.rb b/lib/brakeman/warning.rb
index fcbf222722ba238cbfcf2d0d8c52e0a2c499fb04..086efa818d0467de08d8a4431c9e4dc00ab18128 100644
--- a/lib/brakeman/warning.rb
+++ b/lib/brakeman/warning.rb
@@ -1,3 +1,5 @@
+require 'multi_json'
+
 #The Warning class stores information about warnings
 class Brakeman::Warning
   attr_reader :called_from, :check, :class, :confidence, :controller,
@@ -177,8 +179,6 @@ class Brakeman::Warning
   end
 
   def to_json
-    require 'json'
-
-    JSON.dump self.to_hash
+    MultiJson.dump self.to_hash
   end
 end
diff --git a/test/tests/test_json_compare.rb b/test/tests/test_json_compare.rb
index 6bc77769b82f51e2cc476f261c18b1c66fc8431d..77a92f61815899dda13cfa96e79f3a4f1973574d 100644
--- a/test/tests/test_json_compare.rb
+++ b/test/tests/test_json_compare.rb
@@ -6,7 +6,7 @@ class JSONCompareTests < Test::Unit::TestCase
     @json_path = File.join @path, "report.json"
     File.delete @json_path if File.exist? @json_path
     Brakeman.run :app_path => @path, :output_files => [@json_path]
-    @report = JSON.parse File.read(@json_path)
+    @report = MultiJson.load File.read(@json_path)
   end
 
   def update_json