diff --git a/Tests/Benchmarks/Benchmarks.csproj b/Tests/Benchmarks/Benchmarks.csproj
index 48c71a753..6f82f5aa8 100644
--- a/Tests/Benchmarks/Benchmarks.csproj
+++ b/Tests/Benchmarks/Benchmarks.csproj
@@ -12,6 +12,6 @@
     <PackageReference Include="BenchmarkDotNet" Version="0.14.0" />
     <PackageReference Include="Bogus" Version="35.6.1" />
     <!-- Resolve MSB3277 -->
-    <PackageReference Include="System.Reflection.Metadata" Version="9.0.0" Condition="'$(TargetFramework)' == 'net472'" />
+    <PackageReference Include="System.Reflection.Metadata" Version="9.0.1" Condition="'$(TargetFramework)' == 'net472'" />
   </ItemGroup>
 </Project>
diff --git a/Tests/FluentAssertions.Equivalency.Specs/FluentAssertions.Equivalency.Specs.csproj b/Tests/FluentAssertions.Equivalency.Specs/FluentAssertions.Equivalency.Specs.csproj
index e83ffe734..f764fa291 100644
--- a/Tests/FluentAssertions.Equivalency.Specs/FluentAssertions.Equivalency.Specs.csproj
+++ b/Tests/FluentAssertions.Equivalency.Specs/FluentAssertions.Equivalency.Specs.csproj
@@ -17,7 +17,7 @@
       FluentAssertions.Specs.csproj for net47 does not generate a binding redirect from 4.0.4.0 to 4.0.4.1
       Upgrading to 1.6.0 gives "Could not load file or assembly 'System.Runtime.CompilerServices.Unsafe, Version=4.0.4.0"
     -->
-    <PackageReference Include="System.Collections.Immutable" Version="[1.5.0]" />
+    <PackageReference Include="System.Collections.Immutable" Version="[9.0.1]" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFramework)' == 'net6.0' OR '$(TargetFramework)' == 'net8.0'">
diff --git a/Tests/FluentAssertions.Specs/FluentAssertions.Specs.csproj b/Tests/FluentAssertions.Specs/FluentAssertions.Specs.csproj
index acc609ca0..b30e82f4c 100644
--- a/Tests/FluentAssertions.Specs/FluentAssertions.Specs.csproj
+++ b/Tests/FluentAssertions.Specs/FluentAssertions.Specs.csproj
@@ -17,7 +17,7 @@
       FluentAssertions.Specs.csproj for net47 does not generate a binding redirect from 4.0.4.0 to 4.0.4.1
       Upgrading to 1.6.0 gives "Could not load file or assembly 'System.Runtime.CompilerServices.Unsafe, Version=4.0.4.0"
     -->
-    <PackageReference Include="System.Collections.Immutable" Version="[1.5.0]" />
+    <PackageReference Include="System.Collections.Immutable" Version="[9.0.1]" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFramework)' == 'net6.0' OR '$(TargetFramework)' == 'net8.0'">