diff --git a/CHANGELOG.md b/CHANGELOG.md
index 60d85345c..cd6efd480 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,7 @@ The format is loosely based on [Keep a Changelog](http://keepachangelog.com/en/1
 
 * **Breaking change:** All `ReturnsAsync` and `ThrowsAsync` setup methods now consistently return a new `Task` on each invocation (@snrnats, #595) 
 * Speed up `Mock.Of<T>()` by approx. one order of magnitude (@informatorius, #598)
+* Update package reference to `Castle.Core` (DynamicProxy) from version 4.2.1 to 4.3.0 (@stakx, #624)
 
 #### Fixed
 
diff --git a/Moq.Tests/Moq.Tests.csproj b/Moq.Tests/Moq.Tests.csproj
index e190cc8c8..d5ca940aa 100644
--- a/Moq.Tests/Moq.Tests.csproj
+++ b/Moq.Tests/Moq.Tests.csproj
@@ -20,7 +20,7 @@
 	</PropertyGroup>
 
 	<ItemGroup>
-		<PackageReference Include="Castle.Core" Version="4.2.1" />
+		<PackageReference Include="Castle.Core" Version="4.3.0" />
 		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.5.0" />
 		<PackageReference Include="System.ValueTuple" Version="4.4.0" />
 		<PackageReference Include="xunit" Version="2.3.1" />
diff --git a/Moq.nuspec b/Moq.nuspec
index c16cfaae7..84bad5587 100644
--- a/Moq.nuspec
+++ b/Moq.nuspec
@@ -14,7 +14,7 @@
 		<releaseNotes>A changelog is available at https://github.com/moq/moq4/blob/master/CHANGELOG.md.</releaseNotes>
 		<dependencies>
 			<group targetFramework=".NETFramework4.5">
-				<dependency id="Castle.Core" version="4.2.1" />
+				<dependency id="Castle.Core" version="4.3.0" />
 				<dependency id="System.Threading.Tasks.Extensions" version="4.3.0" />
 				<dependency id="System.ValueTuple" version="4.4.0" />
 			</group>
@@ -22,7 +22,7 @@
 				<dependency id="NETStandard.Library" version="1.6.1" />
 				<dependency id="System.Linq.Queryable" version="4.3.0" />
 				<dependency id="System.Reflection.TypeExtensions" version="4.3.0" />
-				<dependency id="Castle.Core" version="4.2.1" />
+				<dependency id="Castle.Core" version="4.3.0" />
 				<dependency id="System.Threading.Tasks.Extensions" version="4.3.0" />
 				<dependency id="System.ValueTuple" version="4.4.0" />
 			</group>
diff --git a/Source/Moq.csproj b/Source/Moq.csproj
index b7910bca5..cbc93b430 100644
--- a/Source/Moq.csproj
+++ b/Source/Moq.csproj
@@ -27,7 +27,7 @@
 	</PropertyGroup>
 
 	<ItemGroup>
-		<PackageReference Include="Castle.Core" Version="4.2.1" />
+		<PackageReference Include="Castle.Core" Version="4.3.0" />
 		<PackageReference Include="GitInfo" Version="2.0.8" />
 		<PackageReference Include="IFluentInterface" Version="2.0.4" />
 		<PackageReference Include="SourceLink.Create.CommandLine" Version="2.7.3" PrivateAssets="All" />