diff --git a/.github/release-please-manifest.json b/.github/release-please-manifest.json
index 3581b47a1..4e5ba41a4 100644
--- a/.github/release-please-manifest.json
+++ b/.github/release-please-manifest.json
@@ -1,6 +1,6 @@
 {
   "packages/access-client": "18.1.0",
-  "packages/filecoin-api": "4.3.0",
+  "packages/filecoin-api": "4.3.1",
   "packages/filecoin-client": "3.2.0",
   "packages/capabilities": "13.0.0",
   "packages/upload-api": "8.0.0",
diff --git a/packages/filecoin-api/CHANGELOG.md b/packages/filecoin-api/CHANGELOG.md
index 21849bc14..2eca1d2ee 100644
--- a/packages/filecoin-api/CHANGELOG.md
+++ b/packages/filecoin-api/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [4.3.1](https://github.com/web3-storage/w3up/compare/filecoin-api-v4.3.0...filecoin-api-v4.3.1) (2024-01-15)
+
+
+### Fixes
+
+* avoid duplicates on aggregator buffer concat ([#1259](https://github.com/web3-storage/w3up/issues/1259)) ([9e64bab](https://github.com/web3-storage/w3up/commit/9e64babe93edeb474fc740d9be74c709d47bed1a))
+
 ## [4.3.0](https://github.com/web3-storage/w3up/compare/filecoin-api-v4.2.0...filecoin-api-v4.3.0) (2023-11-29)
 
 
diff --git a/packages/filecoin-api/package.json b/packages/filecoin-api/package.json
index d6a1a4207..e626a355a 100644
--- a/packages/filecoin-api/package.json
+++ b/packages/filecoin-api/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@web3-storage/filecoin-api",
-  "version": "4.3.0",
+  "version": "4.3.1",
   "type": "module",
   "main": "./src/lib.js",
   "homepage": "https://web3.storage",