diff --git a/CWT/packages.config b/CWT/packages.config
index 69cb79b..68c54c1 100644
--- a/CWT/packages.config
+++ b/CWT/packages.config
@@ -2,6 +2,6 @@
 <packages>
   <package id="BouncyCastle" version="1.8.1" targetFramework="net40" />
   <package id="Com.AugustCellars.COSE" version="1.0.5.2" targetFramework="net40" />
-  <package id="PeterO.Cbor" version="2.5.2" targetFramework="net40" />
+  <package id="PeterO.Cbor" version="4.0.0" targetFramework="net40" />
   <package id="PeterO.Numbers" version="0.4.0" targetFramework="net40" />
 </packages>
\ No newline at end of file