Can't run bundle update because of json 1.7.5

I can't seem to run bundle update on my Windows 7 machine with Ruby 1.9.3p194. I've installed the latest DevKit as well. bundle complains about the lack of a make command, I can't find make on my hard drive (I searched). How do I get this to work?

C:\website>bundle update
Fetching gem metadata from
Using rake (
Using i18n (0.6.1)
Using multi_json (1.3.6)
Using activesupport (3.2.8)
Using builder (3.0.2)
Using activemodel (3.2.8)
Using erubis (2.7.0)
Using journey (1.0.4)
Using rack (1.4.1)
Using rack-cache (1.2)
Using rack-test (0.6.1)
Using hike (1.2.1)
Using tilt (1.3.3)
Using sprockets (2.1.3)
Using actionpack (3.2.8)
Using mime-types (1.19)
Using polyglot (0.3.3)
Using treetop (1.4.10)
Using mail (2.4.4)
Using actionmailer (3.2.8)
Using arel (3.0.2)
Using tzinfo (0.3.33)
Using activerecord (3.2.8)
Using activeresource (3.2.8)
Using bundler (1.1.5)
Using coffee-script-source (1.3.3)
Using execjs (1.4.0)
Using coffee-script (2.2.0)
Using rack-ssl (1.3.2)
Installing json (1.7.5) with native extensions
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

        C:/Ruby193/bin/ruby.exe extconf.rb
creating Makefile

'make' is not recognized as an internal or external command,
operable program or batch file.

Gem files will remain installed in C:/Ruby193/lib/ruby/gems/1.9.1/gems/json-1.7.5 for inspection.
Results logged to C:/Ruby193/lib/ruby/gems/1.9.1/gems/json-1.7.5/ext/json/ext/generator/gem_make.out
An error occured while installing json (1.7.5), and Bundler cannot continue.
Make sure that `gem install json -v '1.7.5'` succeeds before bundling.


ruby dk.rb install --force in the DevKit directory did the trick.

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