diff --git a/COSE/COSE.Std10.csproj b/COSE/COSE.Std10.csproj
index a4b29e8..252f843 100644
--- a/COSE/COSE.Std10.csproj
+++ b/COSE/COSE.Std10.csproj
@@ -77,7 +77,7 @@
   
 
   <ItemGroup>
-    <PackageReference Include="PeterO.Cbor" Version="4.0.0" />
+    <PackageReference Include="PeterO.Cbor" Version="4.5.1" />
     <PackageReference Include="Portable.BouncyCastle" Version="1.8.5" />
   </ItemGroup>
   <ItemGroup>
diff --git a/COSE/Tests/Tests.csproj b/COSE/Tests/Tests.csproj
index f387a14..9da3d62 100644
--- a/COSE/Tests/Tests.csproj
+++ b/COSE/Tests/Tests.csproj
@@ -10,7 +10,7 @@
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.8.0" />
     <PackageReference Include="MSTest.TestAdapter" Version="1.3.2" />
     <PackageReference Include="MSTest.TestFramework" Version="1.3.2" />
-    <PackageReference Include="PeterO.Cbor" Version="4.0.0" />
+    <PackageReference Include="PeterO.Cbor" Version="4.5.1" />
     <PackageReference Include="Portable.BouncyCastle" Version="1.8.5" />
   </ItemGroup>
 
diff --git a/COSE/packages.config b/COSE/packages.config
index 7dcfd31..8939a51 100644
--- a/COSE/packages.config
+++ b/COSE/packages.config
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="PeterO.Cbor" version="3.0.3" targetFramework="net462" />
+  <package id="PeterO.Cbor" version="4.5.1" targetFramework="net462" />
   <package id="PeterO.Numbers" version="1.0.2" targetFramework="net462" />
 </packages>
\ No newline at end of file