diff --git a/fern/products/sdks/overview/typescript/changelog/2025-11-03.mdx b/fern/products/sdks/overview/typescript/changelog/2025-11-03.mdx
index 97ca2d081..62983d3f6 100644
--- a/fern/products/sdks/overview/typescript/changelog/2025-11-03.mdx
+++ b/fern/products/sdks/overview/typescript/changelog/2025-11-03.mdx
@@ -1,3 +1,7 @@
+## 3.19.1
+**`(fix):`** `mergeHeaders()` and `mergeOnlyDefinedHeaders()` are now case-insensitive.
+
+
 ## 3.19.0
 **`(feat):`** Add support for application/x-www-form-urlencoded request bodies.