diff --git a/appveyor.yml b/appveyor.yml
index bf1c6254f..0ac5aea97 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,4 +1,4 @@
-version: 5.1.3.{build}
+version: 5.1.4.{build}
 
 configuration: Release
 
diff --git a/src/Autofac/Autofac.csproj b/src/Autofac/Autofac.csproj
index acf6004c8..cb370ee6e 100644
--- a/src/Autofac/Autofac.csproj
+++ b/src/Autofac/Autofac.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <Description>Autofac is an IoC container for Microsoft .NET. It manages the dependencies between classes so that applications stay easy to change as they grow in size and complexity.</Description>
-    <VersionPrefix>5.1.3</VersionPrefix>
+    <VersionPrefix>5.1.4</VersionPrefix>
     <TargetFrameworks>netstandard2.1;netstandard2.0;net461</TargetFrameworks>
     <LangVersion>latest</LangVersion>
     <Nullable>enable</Nullable>