diff --git a/RELEASE.md b/RELEASE.md
index 3807e07..4313bb4 100644
--- a/RELEASE.md
+++ b/RELEASE.md
@@ -1,5 +1,17 @@
 # sunspecctl Releases
 
+## v0.4.3
+
+**Date:** 2026-11-01
+**Previous release:** v0.4.2
+
+### Changed
+
+- Dependency update, no other change. Picks up the go-modbus fix for a response that arrives during `Client.Close`.
+- Built on go-modbus v1.10.5, go-sunspec v0.8.3, go-serial v0.2.1.
+
+---
+
 ## v0.4.2
 
 **Date:** 2026-11-01
diff --git a/go.mod b/go.mod
index 0984260..d403d80 100644
--- a/go.mod
+++ b/go.mod
@@ -3,8 +3,8 @@ module github.com/otfabric/sunspecctl
 go 1.23
 
 require (
-	github.com/otfabric/go-modbus v1.10.3
-	github.com/otfabric/go-sunspec v0.8.2
+	github.com/otfabric/go-modbus v1.10.5
+	github.com/otfabric/go-sunspec v0.8.3
 	github.com/spf13/cobra v1.10.2
 )
 
diff --git a/go.sum b/go.sum
index 2c6182c..4481163 100644
--- a/go.sum
+++ b/go.sum
@@ -1,12 +1,12 @@
 github.com/cpuguy83/go-md2man/v2 v2.0.6/go.mod h1:oOW0eioCTA6cOiMLiUPZOpcVxMig6NIQQ7OS05n1F4g=
 github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=
 github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
-github.com/otfabric/go-modbus v1.10.3 h1:aqNcwsOSkhiM1jkJTd5oabiySZAyGzGa86kZJLTSva4=
-github.com/otfabric/go-modbus v1.10.3/go.mod h1:LciyfLtd+4wKhQrDV5TjdrRH3NB60A+5d9bzTtGHQW4=
+github.com/otfabric/go-modbus v1.10.5 h1:ZVs82MLukfzTVAkOlhq8nE9v1DJ3dLik9rJRVpERbMc=
+github.com/otfabric/go-modbus v1.10.5/go.mod h1:LciyfLtd+4wKhQrDV5TjdrRH3NB60A+5d9bzTtGHQW4=
 github.com/otfabric/go-serial v0.2.1 h1:PCOdnCDAHIHFaxTBNmisC/4SlD+NVd74d+EJPnXrCOw=
 github.com/otfabric/go-serial v0.2.1/go.mod h1:TqbYpWWg6W+IuCLs8YM2cndlMAEaTyaKyUX6Z08gtq8=
-github.com/otfabric/go-sunspec v0.8.2 h1:b8IavXsNwMI+XsbRra+ORFWNSsrK6sjiLAw12KrZjo4=
-github.com/otfabric/go-sunspec v0.8.2/go.mod h1:yO9mDZFQuTiR5IH8vWYaXQl+K+PJ4fER9qr5NKn4kR0=
+github.com/otfabric/go-sunspec v0.8.3 h1:xj6d2lcuhRW7KMvUBMHr+E+6YSbe9jKd4aXKUIdU4SY=
+github.com/otfabric/go-sunspec v0.8.3/go.mod h1:mGoLLTbPtiT5cUX3lRAon80wgENEU+/5vxOMDUJTRCk=
 github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
 github.com/santhosh-tekuri/jsonschema/v6 v6.0.3 h1:1EYB5IzjZawrrnELUi78f9fPu57HuXjmddZPjrls/28=
 github.com/santhosh-tekuri/jsonschema/v6 v6.0.3/go.mod h1:JXeL+ps8p7/KNMjDQk3TCwPpBy0wYklyWTfbkIzdIFU=