update changelogs

Author: dsinghvi

fern/products/sdks/generators/csharp/changelog/2026-04-30.mdx

@@ -1,3 +1,23 @@
+## 2.64.1
+**`(fix):`** Fix namespace collision when referencing nested discriminated union variant
+types in generated test code. When the enclosing type name matches a segment
+of the test file's namespace, the C# compiler resolves it as the namespace
+instead of the SDK type (CS0234). Now emits fully qualified type references
+in this case.
+
+
+**`(fix):`** Fix OneOfSerializer to prefer strongly-typed deserialization over catch-all
+matches. When a discriminated union type inside a OneOf uses a catch-all for
+unknown discriminators, the serializer now tries all types and selects the
+best match instead of returning the first success.
+
+
+**`(fix):`** Fix serialization round-trip tests to account for WhenWritingNull normalization.
+The Roundtrips test now verifies idempotency of the serialized form rather than
+comparing against the raw input JSON, which may include null optional properties
+that are intentionally omitted by the serializer.
+
+
 ## 2.64.0
 **`(feat):`** Add `retryStatusCodes` config with `"legacy"` and `"recommended"` modes. Legacy (default)
 preserves current behavior (408, 429, >= 500). Recommended retries only transient

fern/products/sdks/generators/java/changelog/2026-04-30.mdx

@@ -1,3 +1,10 @@
+## 4.7.0
+**`(feat):`** Add `retry-status-codes` config with `"legacy"` and `"recommended"` modes. Legacy (default)
+preserves current behavior (408, 429, >= 500). Recommended retries only transient
+codes (408, 429, 502, 503, 504), avoiding idempotency issues with 500. A 4.0.0
+migration auto-pins legacy for upgrading users.
+
+
 ## 4.6.4
 **`(fix):`** Fix dynamic snippet generation for multipart/form-data endpoints with file parameters.
 Previously, when a file value was not provided in the example, the file argument was