diff --git a/fern/products/sdks/overview/csharp/changelog/2026-03-25.mdx b/fern/products/sdks/overview/csharp/changelog/2026-03-25.mdx
index cbfaff919..edf26f97e 100644
--- a/fern/products/sdks/overview/csharp/changelog/2026-03-25.mdx
+++ b/fern/products/sdks/overview/csharp/changelog/2026-03-25.mdx
@@ -1,3 +1,14 @@
+## 2.54.5
+**`(chore):`** Upgrade BCL/runtime NuGet package versions in generated C# SDKs.
+All packages remain within the 9.x line for net8.0 compatibility.
+
+- Portable.System.DateTimeOnly: 8.0.2 → 9.0.1
+- System.Text.Json: 8.0.5 → 9.0.9 (legacy TFM conditional)
+- Microsoft.Extensions.Logging.Abstractions: 8.0.2 → 9.0.13 (WebSocket)
+- System.Threading.Channels: 8.0.0 → 9.0.13 (WebSocket)
+- System.Net.ServerSentEvents: 9.0.9 → 9.0.14 (SSE)
+
+
 ## 2.54.4
 **`(fix):`** Thread endpoint ID through dynamic snippet generator to differentiate
 generated snippets by endpoint.