diff --git a/CBOR.csproj b/CBOR.csproj
index 0e13e60b..7a5b7bff 100644
--- a/CBOR.csproj
+++ b/CBOR.csproj
@@ -12,10 +12,13 @@
     <AssemblyName>CBOR</AssemblyName>
     <DefaultLanguage>en-US</DefaultLanguage>
     <FileAlignment>512</FileAlignment>
-    <ProjectTypeGuids>{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
+    <ProjectTypeGuids>{786C830F-07A1-408B-BD7F-6EE04809D6DB};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
     <NoWin32Manifest>False</NoWin32Manifest>
     <NuGetPackageImportStamp>
     </NuGetPackageImportStamp>
+    <AssemblyOriginatorKeyFile>PeterO.snk</AssemblyOriginatorKeyFile>
+    <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
+    <TargetFrameworkProfile>Profile259</TargetFrameworkProfile>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Platform)' == 'AnyCPU' ">
     <PlatformTarget>AnyCPU</PlatformTarget>
@@ -62,10 +65,12 @@
     <CodeAnalysisRuleSet>CBOR.ruleset</CodeAnalysisRuleSet>
     <DebugType>none</DebugType>
     <DebugSymbols>false</DebugSymbols>
+    <SignAssembly>true</SignAssembly>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'ReleaseNet40|AnyCPU'">
     <DocumentationFile>bin\ReleaseNet40\CBOR.xml</DocumentationFile>
     <CodeAnalysisRuleSet>CBOR.ruleset</CodeAnalysisRuleSet>
+    <SignAssembly>true</SignAssembly>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="PeterO\BigInteger.cs" />
diff --git a/CBOR.nuspec b/CBOR.nuspec
index 58d0c185..93bef34a 100644
--- a/CBOR.nuspec
+++ b/CBOR.nuspec
@@ -2,7 +2,7 @@
 <package>
   <metadata>
     <id>PeterO.Cbor</id>
-    <version>2.5</version>
+    <version>2.5.1</version>
     <title>CBOR</title>
     <authors>Peter Occil</authors>
     <owners>Peter Occil</owners>
@@ -15,8 +15,8 @@
     </description>
     <summary>A C# implementation of Concise Binary Object Representation (CBOR), a data serialization format. This implementation can also convert between CBOR and JSON.</summary>
     <releaseNotes>
-In version 2.5:
-* Sign the CBOR assembly with a strong name key
+In version 2.5.1:
+* Really sign the CBOR assembly with a strong name key
 In version 2.4.2:
 * Really use 0.2.2 of
   [`PeterO.Numbers`](https://www.nuget.org/packages/PeterO.Numbers)
diff --git a/Properties/AssemblyInfo.cs b/Properties/AssemblyInfo.cs
index 8b852070..b82b3924 100644
--- a/Properties/AssemblyInfo.cs
+++ b/Properties/AssemblyInfo.cs
@@ -33,4 +33,4 @@ Any copyright is dedicated to the Public Domain.
 //
 // You can specify all the values or you can use the default the Revision and
 // Build Numbers by using the '*' as shown below:
-[assembly: AssemblyVersion("2.5")]
+[assembly: AssemblyVersion("2.5.1")]
diff --git a/README.md b/README.md
index 4bea28cb..837da6d7 100644
--- a/README.md
+++ b/README.md
@@ -233,9 +233,14 @@ The following are some clarifications to RFC 7049.
 Release Notes
 -----------
 
+### Version 2.5.1
+
+* Really sign the CBOR assembly with a strong name key.
+
 ### Version 2.5
 
-* Sign the CBOR assembly with a strong name key
+* Sign the CBOR assembly with a strong name key (UPDATE: Version 2.5 was
+  mistakenly released without a strong name.)
 * Update [`PeterO.Numbers`](https://www.nuget.org/packages/PeterO.Numbers) to
   strong-named version