diff --git a/Octokit/packages.config b/Octokit/packages.config
index d53e9fc6..f7abdcf4 100644
--- a/Octokit/packages.config
+++ b/Octokit/packages.config
@@ -8,5 +8,5 @@
   <package id="Rx-Linq" version="2.1.30214.0" targetFramework="net40" />
   <package id="Rx-Main" version="2.1.30214.0" targetFramework="net40" />
   <package id="Rx-PlatformServices" version="2.1.30214.0" targetFramework="net40" />
-  <package id="SimpleJson" version="0.28.0" targetFramework="net40" />
+  <package id="SimpleJson" version="0.28.0" targetFramework="net40" developmentDependency="true" />
 </packages>
\ No newline at end of file