diff --git a/CHANGELOG-3.4.md b/CHANGELOG-3.4.md
index 4b9fbf169b18..0807bab01529 100644
--- a/CHANGELOG-3.4.md
+++ b/CHANGELOG-3.4.md
@@ -61,6 +61,7 @@ See [code changes](https://github.com/coreos/etcd/compare/v3.3.0...v3.4.0) and [
   - 3.4 moves `cmd/vendor` directory to `vendor` at repository root.
   - Remove recursive symlinks in `cmd` directory.
   - Now `go get/install/build` on `etcd` packages (e.g. `clientv3`, `tools/benchmark`) enforce builds with etcd `vendor` directory.
+- Upgrade [`github.com/ugorji/go/codec`](https://github.com/ugorji/go) to [**`v1.1`**](https://github.com/ugorji/go/commit/02537d3a3e32ef636a53519265d211bd208ca488), and [regenerate v2 `client`](https://github.com/coreos/etcd/pull/9492), to [include 32-bit fixes](https://github.com/coreos/etcd/issues/9447).
 
 ### Dependency