diff --git a/examples/COSETests/packages.config b/examples/COSETests/packages.config
index a583f5a..1242cda 100644
--- a/examples/COSETests/packages.config
+++ b/examples/COSETests/packages.config
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="BouncyCastle" version="1.8.1" targetFramework="net40" />
-  <package id="PeterO.Cbor" version="2.4.2" targetFramework="net40" />
+  <package id="PeterO.Cbor" version="4.0.0" targetFramework="net40" />
   <package id="PeterO.Numbers" version="0.2.2" targetFramework="net40" />
 </packages>
\ No newline at end of file