diff --git a/src/HtmlSanitizer/HtmlSanitizer.csproj b/src/HtmlSanitizer/HtmlSanitizer.csproj
index 7f49ebc..8eff906 100644
--- a/src/HtmlSanitizer/HtmlSanitizer.csproj
+++ b/src/HtmlSanitizer/HtmlSanitizer.csproj
@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <Description>Cleans HTML from constructs that can be used for cross-site scripting (XSS)</Description>
@@ -41,7 +41,7 @@
     <PackageReference Include="AngleSharp" Version="[0.17.1]" />
     <PackageReference Include="AngleSharp.Css" Version="[0.17.0]" />
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.1.1" PrivateAssets="All" />
-    <PackageReference Include="System.Collections.Immutable" Version="7.0.0" />
+    <PackageReference Include="System.Collections.Immutable" Version="8.0.0" />
   </ItemGroup>
 
   <ItemGroup Condition=" '$(TargetFramework)' == 'net46'">