diff --git a/PreMailer.Net/PreMailer.Net.Tests/PreMailer.Net.Tests.csproj b/PreMailer.Net/PreMailer.Net.Tests/PreMailer.Net.Tests.csproj
index ec4074c..f4f372a 100644
--- a/PreMailer.Net/PreMailer.Net.Tests/PreMailer.Net.Tests.csproj
+++ b/PreMailer.Net/PreMailer.Net.Tests/PreMailer.Net.Tests.csproj
@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="AngleSharp" Version="1.1.0" />
+    <PackageReference Include="AngleSharp" Version="1.4.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
     <PackageReference Include="Moq" Version="4.20.72" />
     <PackageReference Include="xunit" Version="2.9.3" />
diff --git a/PreMailer.Net/PreMailer.Net/PreMailer.Net.csproj b/PreMailer.Net/PreMailer.Net/PreMailer.Net.csproj
index b5f505e..08af530 100644
--- a/PreMailer.Net/PreMailer.Net/PreMailer.Net.csproj
+++ b/PreMailer.Net/PreMailer.Net/PreMailer.Net.csproj
@@ -19,7 +19,11 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="AngleSharp" Version="1.1.0" />
+    <PackageReference Include="AngleSharp" Version="1.4.0" />
+  </ItemGroup>
+
+  <ItemGroup Condition="'$(TargetFramework)' == 'net461'">
+    <PackageReference Include="System.Memory" Version="4.5.5" />
   </ItemGroup>
 
   <ItemGroup>