diff --git a/fern/products/sdks/overview/csharp/changelog/2025-10-09.mdx b/fern/products/sdks/overview/csharp/changelog/2025-10-09.mdx
new file mode 100644
index 000000000..b66c78b8e
--- /dev/null
+++ b/fern/products/sdks/overview/csharp/changelog/2025-10-09.mdx
@@ -0,0 +1,5 @@
+## 2.4.2
+**`(fix):`** Enabled SSE and JSON streaming to deserialize OneOf the same as WebSockets can.
+Fixed minor nullability warnings.
+
+