diff --git a/tests/Invisionware.Collections.Tests/Invisionware.Collections.Tests.csproj b/tests/Invisionware.Collections.Tests/Invisionware.Collections.Tests.csproj
index fe6cb6d..b9c59c1 100644
--- a/tests/Invisionware.Collections.Tests/Invisionware.Collections.Tests.csproj
+++ b/tests/Invisionware.Collections.Tests/Invisionware.Collections.Tests.csproj
@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="FluentAssertions" Version="5.7.0" />
+    <PackageReference Include="FluentAssertions" Version="5.9.0" />
     <PackageReference Include="nunit" Version="3.12.0" />
     <PackageReference Include="NUnit3TestAdapter" Version="3.13.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.2.0" />