diff --git a/CHANGELOG.md b/CHANGELOG.md
index bf045463..f0447ab7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+# 0.16.0
+
+Released on Sunday, June 13 2021.
+
+- Updated to use AngleSharp 0.16
+
 # 0.15.1
 
 Release on Sunday, June 6 2021.
diff --git a/src/AngleSharp.Css.Tests/AngleSharp.Css.Tests.csproj b/src/AngleSharp.Css.Tests/AngleSharp.Css.Tests.csproj
index aa45e263..024bfc65 100644
--- a/src/AngleSharp.Css.Tests/AngleSharp.Css.Tests.csproj
+++ b/src/AngleSharp.Css.Tests/AngleSharp.Css.Tests.csproj
@@ -1,10 +1,10 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFrameworks>netcoreapp2.1</TargetFrameworks>
     <SignAssembly>true</SignAssembly>
     <AssemblyOriginatorKeyFile>Key.snk</AssemblyOriginatorKeyFile>
     <IsPackable>false</IsPackable>
-    <LangVersion>7.1</LangVersion>
+    <LangVersion>9.0</LangVersion>
     <AssemblyName>AngleSharp.Css.Tests</AssemblyName>
     <CopyLocalLockFileAssemblies>true</CopyLocalLockFileAssemblies> <!-- https://github.com/Tyrrrz/GitHubActionsTestLogger/issues/5 -->
   </PropertyGroup>
@@ -16,7 +16,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="AngleSharp.Xml" Version="0.15.0" />
+    <PackageReference Include="AngleSharp.Xml" Version="0.16.0" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
     <PackageReference Include="NUnit" Version="3.13.1" />
     <PackageReference Include="NUnit3TestAdapter" Version="3.17.0" />
diff --git a/src/AngleSharp.Css.Tests/Functions/CssDocumentFunction.cs b/src/AngleSharp.Css.Tests/Functions/CssDocumentFunction.cs
index a2ab3fd6..49b95970 100644
--- a/src/AngleSharp.Css.Tests/Functions/CssDocumentFunction.cs
+++ b/src/AngleSharp.Css.Tests/Functions/CssDocumentFunction.cs
@@ -1,6 +1,7 @@
 namespace AngleSharp.Css.Tests.Functions
 {
     using AngleSharp.Css.Dom;
+    using AngleSharp.Dom;
     using NUnit.Framework;
     using System.Linq;
     using static CssConstructionFunctions;
diff --git a/src/AngleSharp.Css.Tests/Mocks/PageRequester.cs b/src/AngleSharp.Css.Tests/Mocks/PageRequester.cs
index 29bc34c2..a62c3174 100644
--- a/src/AngleSharp.Css.Tests/Mocks/PageRequester.cs
+++ b/src/AngleSharp.Css.Tests/Mocks/PageRequester.cs
@@ -1,5 +1,6 @@
 namespace AngleSharp.Css.Tests.Mocks
 {
+    using AngleSharp.Dom;
     using AngleSharp.Io;
     using AngleSharp.Text;
     using System;
diff --git a/src/AngleSharp.Css.Tests/Mocks/SiteMapping.cs b/src/AngleSharp.Css.Tests/Mocks/SiteMapping.cs
index 0f93ab26..72d5978e 100644
--- a/src/AngleSharp.Css.Tests/Mocks/SiteMapping.cs
+++ b/src/AngleSharp.Css.Tests/Mocks/SiteMapping.cs
@@ -1,5 +1,6 @@
 namespace AngleSharp.Css.Tests.Mocks
 {
+    using AngleSharp.Dom;
     using AngleSharp.Xml;
     using AngleSharp.Xml.Dom;
     using AngleSharp.Xml.Parser;
diff --git a/src/AngleSharp.Css.Tests/Parsing/CssTokenization.cs b/src/AngleSharp.Css.Tests/Parsing/CssTokenization.cs
index 5133dc54..d8471f18 100644
--- a/src/AngleSharp.Css.Tests/Parsing/CssTokenization.cs
+++ b/src/AngleSharp.Css.Tests/Parsing/CssTokenization.cs
@@ -1,6 +1,7 @@
 namespace AngleSharp.Css.Tests.Parsing
 {
     using AngleSharp.Css.Parser;
+    using AngleSharp.Dom;
     using AngleSharp.Text;
     using NUnit.Framework;
 
diff --git a/src/AngleSharp.Css.Tests/Rules/CssImportRule.cs b/src/AngleSharp.Css.Tests/Rules/CssImportRule.cs
index 41f1cf9b..2a329c39 100644
--- a/src/AngleSharp.Css.Tests/Rules/CssImportRule.cs
+++ b/src/AngleSharp.Css.Tests/Rules/CssImportRule.cs
@@ -1,5 +1,6 @@
 namespace AngleSharp.Css.Tests.Rules
 {
+    using AngleSharp.Dom;
     using NUnit.Framework;
     using static CssConstructionFunctions;
 
diff --git a/src/AngleSharp.Css.nuspec b/src/AngleSharp.Css.nuspec
index 8e33fe5f..f401d037 100644
--- a/src/AngleSharp.Css.nuspec
+++ b/src/AngleSharp.Css.nuspec
@@ -14,7 +14,7 @@
     <copyright>Copyright 2016-2021, AngleSharp</copyright>
     <tags>html html5 css css3 dom styling library anglesharp angle</tags>
     <dependencies>
-      <dependency id="AngleSharp" version="0.15.0" />
+      <dependency id="AngleSharp" version="0.16.0" />
     </dependencies>
   </metadata>
 </package>
diff --git a/src/AngleSharp.Css/AngleSharp.Css.csproj b/src/AngleSharp.Css/AngleSharp.Css.csproj
index 5b59d267..d2665667 100644
--- a/src/AngleSharp.Css/AngleSharp.Css.csproj
+++ b/src/AngleSharp.Css/AngleSharp.Css.csproj
@@ -7,7 +7,7 @@
     <SignAssembly>true</SignAssembly>
     <AssemblyOriginatorKeyFile>Key.snk</AssemblyOriginatorKeyFile>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
-    <LangVersion>7.1</LangVersion>
+    <LangVersion>9.0</LangVersion>
     <RepositoryUrl>https://github.com/AngleSharp/AngleSharp.Css</RepositoryUrl>
     <RepositoryType>git</RepositoryType>
     <PublishRepositoryUrl>true</PublishRepositoryUrl>
@@ -21,7 +21,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="AngleSharp" Version="0.15.0" />
+    <PackageReference Include="AngleSharp" Version="0.16.0" />
   </ItemGroup>
 
   <PropertyGroup Condition=" '$(OS)' == 'Windows_NT' ">
diff --git a/src/AngleSharp.Css/Dom/CssHelpers.cs b/src/AngleSharp.Css/Dom/CssHelpers.cs
index f10c12db..228412b6 100644
--- a/src/AngleSharp.Css/Dom/CssHelpers.cs
+++ b/src/AngleSharp.Css/Dom/CssHelpers.cs
@@ -44,7 +44,7 @@ public static String Escape(String str)
                         continue;
                     }
                     else if (ch < 0x80 && 
-                            !ch.IsOneOf(Symbols.Minus,Symbols.Underscore) && 
+                            !(ch is Symbols.Minus or Symbols.Underscore) && 
                             !ch.IsAlphanumericAscii())
                     {
                         sb.Append(Symbols.ReverseSolidus);
diff --git a/src/AngleSharp.Css/Dom/IDocumentFunction.cs b/src/AngleSharp.Css/Dom/IDocumentFunction.cs
index ac9510fc..f771fd8d 100644
--- a/src/AngleSharp.Css/Dom/IDocumentFunction.cs
+++ b/src/AngleSharp.Css/Dom/IDocumentFunction.cs
@@ -1,5 +1,6 @@
 namespace AngleSharp.Css.Dom
 {
+    using AngleSharp.Dom;
     using System;
 
     /// <summary>
diff --git a/src/AngleSharp.Css/Dom/Internal/DocumentFunction.cs b/src/AngleSharp.Css/Dom/Internal/DocumentFunction.cs
index 40d19114..d6db9281 100644
--- a/src/AngleSharp.Css/Dom/Internal/DocumentFunction.cs
+++ b/src/AngleSharp.Css/Dom/Internal/DocumentFunction.cs
@@ -1,5 +1,6 @@
 namespace AngleSharp.Css.Dom
 {
+    using AngleSharp.Dom;
     using AngleSharp.Text;
     using System;
     using System.IO;
diff --git a/src/AngleSharp.Css/Dom/Internal/DocumentFunctions/DomainFunction.cs b/src/AngleSharp.Css/Dom/Internal/DocumentFunctions/DomainFunction.cs
index 5fbe382e..922d93ec 100644
--- a/src/AngleSharp.Css/Dom/Internal/DocumentFunctions/DomainFunction.cs
+++ b/src/AngleSharp.Css/Dom/Internal/DocumentFunctions/DomainFunction.cs
@@ -1,6 +1,7 @@
 namespace AngleSharp.Css.Dom
 {
     using AngleSharp.Css;
+    using AngleSharp.Dom;
     using AngleSharp.Text;
     using System;
 
diff --git a/src/AngleSharp.Css/Dom/Internal/DocumentFunctions/RegexpFunction.cs b/src/AngleSharp.Css/Dom/Internal/DocumentFunctions/RegexpFunction.cs
index 0f3d2c38..f3e51c2b 100644
--- a/src/AngleSharp.Css/Dom/Internal/DocumentFunctions/RegexpFunction.cs
+++ b/src/AngleSharp.Css/Dom/Internal/DocumentFunctions/RegexpFunction.cs
@@ -1,6 +1,7 @@
 namespace AngleSharp.Css.Dom
 {
     using AngleSharp.Css;
+    using AngleSharp.Dom;
     using System;
     using System.Text.RegularExpressions;
 
diff --git a/src/AngleSharp.Css/Dom/Internal/DocumentFunctions/UrlFunction.cs b/src/AngleSharp.Css/Dom/Internal/DocumentFunctions/UrlFunction.cs
index 15f2851b..369b3589 100644
--- a/src/AngleSharp.Css/Dom/Internal/DocumentFunctions/UrlFunction.cs
+++ b/src/AngleSharp.Css/Dom/Internal/DocumentFunctions/UrlFunction.cs
@@ -1,6 +1,7 @@
 namespace AngleSharp.Css.Dom
 {
     using AngleSharp.Css;
+    using AngleSharp.Dom;
     using System;
 
     /// <summary>
diff --git a/src/AngleSharp.Css/Dom/Internal/DocumentFunctions/UrlPrefixFunction.cs b/src/AngleSharp.Css/Dom/Internal/DocumentFunctions/UrlPrefixFunction.cs
index afcaf7f4..d84337b4 100644
--- a/src/AngleSharp.Css/Dom/Internal/DocumentFunctions/UrlPrefixFunction.cs
+++ b/src/AngleSharp.Css/Dom/Internal/DocumentFunctions/UrlPrefixFunction.cs
@@ -1,6 +1,7 @@
 namespace AngleSharp.Css.Dom
 {
     using AngleSharp.Css;
+    using AngleSharp.Dom;
     using System;
 
     /// <summary>
diff --git a/src/AngleSharp.Css/Extensions/ValidationExtensions.cs b/src/AngleSharp.Css/Extensions/ValidationExtensions.cs
index 937c4cb5..cd7ff474 100644
--- a/src/AngleSharp.Css/Extensions/ValidationExtensions.cs
+++ b/src/AngleSharp.Css/Extensions/ValidationExtensions.cs
@@ -1,5 +1,6 @@
 namespace AngleSharp.Css.Dom
 {
+    using AngleSharp.Dom;
     using System;
     using System.Linq;
 
diff --git a/src/AngleSharp.Css/Factories/DefaultDocumentFunctionFactory.cs b/src/AngleSharp.Css/Factories/DefaultDocumentFunctionFactory.cs
index 95501300..63ce44e7 100644
--- a/src/AngleSharp.Css/Factories/DefaultDocumentFunctionFactory.cs
+++ b/src/AngleSharp.Css/Factories/DefaultDocumentFunctionFactory.cs
@@ -1,6 +1,7 @@
 namespace AngleSharp.Css
 {
     using AngleSharp.Css.Dom;
+    using AngleSharp.Dom;
     using System;
     using System.Collections.Generic;
 
diff --git a/src/AngleSharp.Css/Parser/CssTokenizer.cs b/src/AngleSharp.Css/Parser/CssTokenizer.cs
index e675b2ee..94392381 100644
--- a/src/AngleSharp.Css/Parser/CssTokenizer.cs
+++ b/src/AngleSharp.Css/Parser/CssTokenizer.cs
@@ -1,6 +1,7 @@
 namespace AngleSharp.Css.Parser
 {
     using AngleSharp.Common;
+    using AngleSharp.Dom;
     using AngleSharp.Css.Dom.Events;
     using AngleSharp.Css.Parser.Tokens;
     using AngleSharp.Text;
@@ -65,7 +66,7 @@ public String ContentFrom(Int32 position)
             var current = Current;
             var spaced = 0;
 
-            while (!current.IsOneOf(Symbols.EndOfFile, Symbols.Semicolon, Symbols.CurlyBracketOpen, Symbols.CurlyBracketClose))
+            while (!(current is Symbols.EndOfFile or Symbols.Semicolon or Symbols.CurlyBracketOpen or Symbols.CurlyBracketClose))
             {
                 var token = Data(current);
 
@@ -762,7 +763,7 @@ private CssToken NumberStart(Char current)
         {
             while (true)
             {
-                if (current.IsOneOf(Symbols.Plus, Symbols.Minus))
+                if (current is Symbols.Plus or Symbols.Minus) 
                 {
                     StringBuffer.Append(current);
                     current = GetNext();
@@ -1099,7 +1100,7 @@ private CssToken UrlUQ(Char current)
                 {
                     return NewUrl(FlushBuffer(), bad: true);
                 }
-                else if (current.IsOneOf(Symbols.DoubleQuote, Symbols.SingleQuote, Symbols.RoundBracketOpen) || current.IsNonPrintable())
+                else if (current is Symbols.DoubleQuote or Symbols.SingleQuote or Symbols.RoundBracketOpen || current.IsNonPrintable())
                 {
                     RaiseErrorOccurred(CssParseError.InvalidCharacter);
                     return UrlBad();
diff --git a/src/AngleSharp.Css/Parser/Micro/CssUriParser.cs b/src/AngleSharp.Css/Parser/Micro/CssUriParser.cs
index dc739028..1685a657 100644
--- a/src/AngleSharp.Css/Parser/Micro/CssUriParser.cs
+++ b/src/AngleSharp.Css/Parser/Micro/CssUriParser.cs
@@ -137,12 +137,12 @@ private static CssUrlValue Unquoted(StringSource source)
                 {
                     return End(source, buffer);
                 }
-                else if (current.IsOneOf(Symbols.RoundBracketClose, Symbols.EndOfFile))
+                else if (current is Symbols.RoundBracketClose or Symbols.EndOfFile) 
                 {
                     source.Next();
                     return new CssUrlValue(buffer.ToPool());
                 }
-                else if (current.IsOneOf(Symbols.DoubleQuote, Symbols.SingleQuote, Symbols.RoundBracketOpen) || current.IsNonPrintable())
+                else if (current is Symbols.DoubleQuote or Symbols.SingleQuote or Symbols.RoundBracketOpen || current.IsNonPrintable())
                 {
                     return Bad(source, buffer);
                 }
diff --git a/src/AngleSharp.Css/Parser/Micro/UnitParser.cs b/src/AngleSharp.Css/Parser/Micro/UnitParser.cs
index 7b707132..cbc35a2b 100644
--- a/src/AngleSharp.Css/Parser/Micro/UnitParser.cs
+++ b/src/AngleSharp.Css/Parser/Micro/UnitParser.cs
@@ -289,7 +289,7 @@ private static Unit UnitStart(StringSource source)
         {
             var current = source.Current;
 
-            if (current.IsOneOf(Symbols.Plus, Symbols.Minus))
+            if (current is Symbols.Plus or Symbols.Minus)
             {
                 var next = source.Next();
 
diff --git a/src/AngleSharp.Css/Parser/StringSourceExtensions.cs b/src/AngleSharp.Css/Parser/StringSourceExtensions.cs
index 3677da94..c6bcfdc0 100644
--- a/src/AngleSharp.Css/Parser/StringSourceExtensions.cs
+++ b/src/AngleSharp.Css/Parser/StringSourceExtensions.cs
@@ -1,4 +1,4 @@
-namespace AngleSharp.Css.Parser
+namespace AngleSharp.Css.Parser
 {
     using AngleSharp.Text;
     using System;
@@ -42,7 +42,7 @@ public static String TakeUntilClosed(this StringSource source)
                     current = source.SkipCssComment();
                     continue;
                 }
-                else if (current.IsOneOf(Symbols.SingleQuote, Symbols.DoubleQuote))
+                else if (current is Symbols.SingleQuote or Symbols.DoubleQuote)
                 {
                     source.ParseString();
                     current = source.Current;
diff --git a/src/AngleSharp.Performance.Css/AngleSharp.Performance.Css.csproj b/src/AngleSharp.Performance.Css/AngleSharp.Performance.Css.csproj
index 07b0f8fa..5ff45cae 100644
--- a/src/AngleSharp.Performance.Css/AngleSharp.Performance.Css.csproj
+++ b/src/AngleSharp.Performance.Css/AngleSharp.Performance.Css.csproj
@@ -21,7 +21,7 @@
 
   <ItemGroup>
     <PackageReference Include="Alba.CsCss" version="1.0.1.0" />
-    <PackageReference Include="AngleSharp" Version="0.15.0" />
+    <PackageReference Include="AngleSharp" Version="0.16.0" />
     <PackageReference Include="ExCSS" version="2.0.6" />
   </ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/src/Directory.Build.props b/src/Directory.Build.props
index 7b45d666..9150a5ba 100644
--- a/src/Directory.Build.props
+++ b/src/Directory.Build.props
@@ -2,6 +2,6 @@
   <PropertyGroup>
     <Description>Extends the CSSOM from the core AngleSharp library.</Description>
     <Product>AngleSharp.Css</Product>
-    <Version>0.15.1</Version>
+    <Version>0.16.0</Version>
   </PropertyGroup>
 </Project>
diff --git a/tools/anglesharp.cake b/tools/anglesharp.cake
index 09988d9b..bfcc3bdc 100644
--- a/tools/anglesharp.cake
+++ b/tools/anglesharp.cake
@@ -178,7 +178,7 @@ Task("Publish-Release")
             Name = version,
             Body = String.Join(Environment.NewLine, releaseNotes.Notes),
             Prerelease = false,
-            TargetCommitish = "master",
+            TargetCommitish = "main",
         }).Wait();
     });