diff --git a/src/AngleSharp.Css/AngleSharp.Css.csproj b/src/AngleSharp.Css/AngleSharp.Css.csproj
index 7ed2ac03..d947e988 100644
--- a/src/AngleSharp.Css/AngleSharp.Css.csproj
+++ b/src/AngleSharp.Css/AngleSharp.Css.csproj
@@ -21,7 +21,8 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="AngleSharp" Version="1.4.0-beta.495" />
+    <PackageReference Include="AngleSharp" Version="1.4.0" />
+    <PackageReference Include="System.Memory" Version="4.5.5" Condition="'$(TargetFramework)' == 'netstandard2.0' Or '$(TargetFramework)' == 'net462' Or '$(TargetFramework)' == 'net472'" />
   </ItemGroup>
 
   <PropertyGroup Condition=" '$(OS)' == 'Windows_NT' ">
diff --git a/src/AngleSharp.Performance.Css/AngleSharp.Performance.Css.csproj b/src/AngleSharp.Performance.Css/AngleSharp.Performance.Css.csproj
index 8bfd47f9..e48c8dde 100644
--- a/src/AngleSharp.Performance.Css/AngleSharp.Performance.Css.csproj
+++ b/src/AngleSharp.Performance.Css/AngleSharp.Performance.Css.csproj
@@ -27,7 +27,7 @@
 
   <ItemGroup>
     <PackageReference Include="Alba.CsCss" version="1.0.1.0" />
-    <PackageReference Include="AngleSharp" Version="1.4.0-beta.495" />
+    <PackageReference Include="AngleSharp" Version="1.4.0" />
     <PackageReference Include="ExCSS" version="2.0.6" />
   </ItemGroup>
 </Project>
\ No newline at end of file