diff --git a/Directory.Packages.props b/Directory.Packages.props
index 169185cf..22fa46e1 100644
--- a/Directory.Packages.props
+++ b/Directory.Packages.props
@@ -8,7 +8,7 @@
     <PackageVersion Include="FodyPackaging" Version="6.9.3" />
     <PackageVersion Include="JetBrains.Annotations" Version="2026.2.0" />
     <PackageVersion Include="Microsoft.CSharp" Version="4.7.0" />
-    <PackageVersion Include="System.Collections.Immutable" Version="10.0.13" />
+    <PackageVersion Include="System.Collections.Immutable" Version="10.0.14" />
     <!-- the TUnit metapackage is not used since it brings in a Mono.Cecil that conflicts with the Cecil used by Fody -->
     <PackageVersion Include="TUnit.Core" Version="1.75.0" />
     <PackageVersion Include="TUnit.Assertions" Version="1.76.0" />
diff --git a/TestsCommon/TestsCommon.csproj b/TestsCommon/TestsCommon.csproj
index dd19f7ed..683f033b 100644
--- a/TestsCommon/TestsCommon.csproj
+++ b/TestsCommon/TestsCommon.csproj
@@ -10,6 +10,7 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="FodyHelpers" />
+    <PackageReference Include="System.Collections.Immutable" VersionOverride="10.0.14" />
     <PackageReference Include="TUnit.Core" />
     <PackageReference Include="TUnit.Assertions" />
     <PackageReference Include="TUnit.Engine" />