diff --git a/appveyor.yml b/appveyor.yml
index 77e86b1..7be3cfe 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,4 +1,4 @@
-version: 5.0.0.{build}
+version: 5.1.0.{build}
 
 configuration: Release
 
diff --git a/src/Autofac.Configuration/Autofac.Configuration.csproj b/src/Autofac.Configuration/Autofac.Configuration.csproj
index c6781e5..dad5567 100644
--- a/src/Autofac.Configuration/Autofac.Configuration.csproj
+++ b/src/Autofac.Configuration/Autofac.Configuration.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <Description>Configuration support for Autofac.</Description>
-    <VersionPrefix>5.0.0</VersionPrefix>
+    <VersionPrefix>5.1.0</VersionPrefix>
     <TargetFrameworks>net461;netstandard2.0</TargetFrameworks>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>