diff --git a/src/Caliburn.Micro.Core.Tests/Caliburn.Micro.Core.Tests.csproj b/src/Caliburn.Micro.Core.Tests/Caliburn.Micro.Core.Tests.csproj
index f1c7c8e92..99ee2a0c1 100644
--- a/src/Caliburn.Micro.Core.Tests/Caliburn.Micro.Core.Tests.csproj
+++ b/src/Caliburn.Micro.Core.Tests/Caliburn.Micro.Core.Tests.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="MSBuild.Sdk.Extras">
 
   <PropertyGroup>
-    <TargetFramework>net46</TargetFramework>
+    <TargetFramework>net45</TargetFramework>
     <IsPackable>false</IsPackable>
   </PropertyGroup>
 
diff --git a/src/Caliburn.Micro.Core/Caliburn.Micro.Core.csproj b/src/Caliburn.Micro.Core/Caliburn.Micro.Core.csproj
index 9c09e5e96..c89ba4bc4 100644
--- a/src/Caliburn.Micro.Core/Caliburn.Micro.Core.csproj
+++ b/src/Caliburn.Micro.Core/Caliburn.Micro.Core.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="MSBuild.Sdk.Extras">
 
   <PropertyGroup>
-    <TargetFrameworks>netstandard1.3;net46;uap10.0.16299;Xamarin.iOS10;MonoAndroid80</TargetFrameworks>
+    <TargetFrameworks>netstandard1.1;net45;uap10.0.16299;Xamarin.iOS10;MonoAndroid80</TargetFrameworks>
     <PackageId>Caliburn.Micro.Core</PackageId>
     <Product>Caliburn.Micro Core</Product>
     <RootNamespace>Caliburn.Micro</RootNamespace>
diff --git a/src/Caliburn.Micro.Platform/Caliburn.Micro.Platform.csproj b/src/Caliburn.Micro.Platform/Caliburn.Micro.Platform.csproj
index 3e9db3c0d..13d5cf330 100644
--- a/src/Caliburn.Micro.Platform/Caliburn.Micro.Platform.csproj
+++ b/src/Caliburn.Micro.Platform/Caliburn.Micro.Platform.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="MSBuild.Sdk.Extras">
 
   <PropertyGroup>
-    <TargetFrameworks>net46;uap10.0.16299;Xamarin.iOS10;MonoAndroid80;netstandard2.0</TargetFrameworks>
+    <TargetFrameworks>net45;uap10.0.16299;Xamarin.iOS10;MonoAndroid80;netstandard2.0</TargetFrameworks>
     <PackageId>Caliburn.Micro</PackageId>
     <Product>Caliburn.Micro</Product>
     <RootNamespace>Caliburn.Micro</RootNamespace>
@@ -11,7 +11,7 @@
     <DefineConstants>XFORMS</DefineConstants>
   </PropertyGroup>
 
-  <PropertyGroup Condition="'$(TargetFramework)' == 'net46'">
+  <PropertyGroup Condition="'$(TargetFramework)' == 'net45'">
     <AssemblyOriginatorKeyFile>.\..\Caliburn.Micro.snk</AssemblyOriginatorKeyFile>
     <SignAssembly>true</SignAssembly>
   </PropertyGroup>
@@ -22,7 +22,7 @@
     <None Include="Platforms\**\*.cs" />
   </ItemGroup>
 
-  <ItemGroup Condition="'$(TargetFramework)' == 'net46'">
+  <ItemGroup Condition="'$(TargetFramework)' == 'net45'">
     <PackageReference Include="Microsoft.Xaml.Behaviors.Wpf" Version=" 1.0.1" />
     <Reference Include="PresentationCore" />
     <Reference Include="PresentationFramework" />