diff --git a/src/AngleSharp.Diffing.Tests/AngleSharp.DiffingTests.csproj b/src/AngleSharp.Diffing.Tests/AngleSharp.DiffingTests.csproj
index ec15b72..e1f8a91 100644
--- a/src/AngleSharp.Diffing.Tests/AngleSharp.DiffingTests.csproj
+++ b/src/AngleSharp.Diffing.Tests/AngleSharp.DiffingTests.csproj
@@ -10,6 +10,9 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <!-- Run the tests on a newer AngleSharp than the library's minimum: from 1.3.1 its .NET 8 build
+         differs from the netstandard2.0 build the library compiles against (IHtmlCollection<T> indexer). -->
+    <PackageReference Update="AngleSharp" Version="1.10.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
     <PackageReference Include="GitHubActionsTestLogger" Version="2.4.1">
       <PrivateAssets>all</PrivateAssets>
diff --git a/src/AngleSharp.Diffing/Strategies/ElementStrategies/CssSelectorElementMatcher.cs b/src/AngleSharp.Diffing/Strategies/ElementStrategies/CssSelectorElementMatcher.cs
index a900b62..bdc985f 100644
--- a/src/AngleSharp.Diffing/Strategies/ElementStrategies/CssSelectorElementMatcher.cs
+++ b/src/AngleSharp.Diffing/Strategies/ElementStrategies/CssSelectorElementMatcher.cs
@@ -43,7 +43,7 @@ private static bool TryGetTestNode(IDiffContext context, string cssSelector, [No
         testNode = searchResult.Length switch
         {
             0 => null,
-            1 => searchResult[0],
+            1 => searchResult.First(),
             _ => throw new DiffMatchSelectorReturnedTooManyResultsException($@"The CSS selector ""{cssSelector}"" returned {searchResult.Length} matches from the test node tree. No more than one is allowed.")
         };