diff --git a/Libraries/FHIR3.Core/Source/packages.config b/Libraries/FHIR3.Core/Source/packages.config
index 99d221fa7..87ab311e9 100644
--- a/Libraries/FHIR3.Core/Source/packages.config
+++ b/Libraries/FHIR3.Core/Source/packages.config
@@ -3,6 +3,6 @@
   <package id="Hl7.Fhir.STU3" version="0.93.4" targetFramework="net452" />
   <package id="Hl7.Fhir.Support" version="0.4.2" targetFramework="net452" />
   <package id="Hl7.FhirPath" version="0.4.2" targetFramework="net452" />
-  <package id="Newtonsoft.Json" version="9.0.1" targetFramework="net452" />
+  <package id="Newtonsoft.Json" version="13.0.1" targetFramework="net452" />
   <package id="System.ValueTuple" version="4.3.0" targetFramework="net452" />
 </packages>
\ No newline at end of file