diff --git a/src/Hyperion.Tests/Hyperion.Tests.csproj b/src/Hyperion.Tests/Hyperion.Tests.csproj
index 67fac9e7..dbf0c2ba 100644
--- a/src/Hyperion.Tests/Hyperion.Tests.csproj
+++ b/src/Hyperion.Tests/Hyperion.Tests.csproj
@@ -12,7 +12,7 @@
   <ItemGroup>
     <PackageReference Include="FluentAssertions" Version="5.10.3" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="$(TestSdkVersion)" />
-    <PackageReference Include="System.Collections.Immutable" Version="1.7.1" />
+    <PackageReference Include="System.Collections.Immutable" Version="5.0.0" />
     <PackageReference Include="xunit" Version="$(XunitVersion)" />
     <PackageReference Include="xunit.runner.visualstudio" Version="$(XunitRunnerVersion)" />
   </ItemGroup>