diff --git a/Libraries/FHIR.Core/Source/packages.config b/Libraries/FHIR.Core/Source/packages.config
index 2b2fbf510..b33bbb028 100644
--- a/Libraries/FHIR.Core/Source/packages.config
+++ b/Libraries/FHIR.Core/Source/packages.config
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="Hl7.Fhir.DSTU2" version="0.90.4" targetFramework="net4" requireReinstallation="true" />
-  <package id="Newtonsoft.Json" version="9.0.1" targetFramework="net452" />
+  <package id="Newtonsoft.Json" version="13.0.1" targetFramework="net452" />
 </packages>
\ No newline at end of file