diff --git a/ImmutableTest/packages.config b/ImmutableTest/packages.config
index 171f425..05f015a 100644
--- a/ImmutableTest/packages.config
+++ b/ImmutableTest/packages.config
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="MSTest.TestAdapter" version="1.4.0" targetFramework="net472" />
-  <package id="Newtonsoft.Json" version="12.0.1" targetFramework="net461" />
+  <package id="Newtonsoft.Json" version="13.0.1" targetFramework="net461" />
   <package id="NUnit" version="3.11.0" targetFramework="net472" />
   <package id="System.Collections.Immutable" version="1.5.0" targetFramework="net461" />
 </packages>
\ No newline at end of file