diff --git a/fern/products/sdks/overview/csharp/changelog/2026-03-20.mdx b/fern/products/sdks/overview/csharp/changelog/2026-03-20.mdx
index 8812a00139..9c2b5a7bbc 100644
--- a/fern/products/sdks/overview/csharp/changelog/2026-03-20.mdx
+++ b/fern/products/sdks/overview/csharp/changelog/2026-03-20.mdx
@@ -1,3 +1,9 @@
+## 2.51.1
+**`(chore):`** Remove dead `#elif NET7_0_OR_GREATER` and `#else` branches inside
+`QueryStringBuilder` that could only execute on .NET 6 or .NET 7,
+which are no longer targeted.
+
+
 ## 2.51.0
 **`(feat):`** Add `net9.0` target framework to all generated C# SDK projects. The library
 now targets `net462;net8.0;net9.0;netstandard2.0`, enabling `#if NET9_0_OR_GREATER`
diff --git a/fern/products/sdks/overview/rust/changelog/2026-03-20.mdx b/fern/products/sdks/overview/rust/changelog/2026-03-20.mdx
index ecc236c249..839fb0f7af 100644
--- a/fern/products/sdks/overview/rust/changelog/2026-03-20.mdx
+++ b/fern/products/sdks/overview/rust/changelog/2026-03-20.mdx
@@ -1,3 +1,10 @@
+## 0.21.0
+**`(feat):`** Add forward-compatible enum support. When `forward-compatible: true` is set on an enum
+type, the generated Rust enum includes a `#[non_exhaustive]` attribute, a hidden
+`__Unknown(String)` variant for unrecognized values, and custom Serialize/Deserialize
+implementations that gracefully handle unknown enum values from the server.
+
+
 ## 0.20.4
 **`(fix):`** Derive `Default` on request body types (inlined and query-parameter requests) when all
 fields have types that implement `Default` in Rust, not only when all fields are `Option<T>`.