diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index d6f5405..ada7355 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "3.0.1"
+  ".": "3.1.0"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 00275f4..c1c5b15 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,20 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [3.1.0](https://github.com/smart-swimmingpool/monitor/compare/v3.0.1...v3.1.0) (2026-08-11)
+
+
+### Features
+
+* optional MQTT username/password with portal restyling ([9b0ab7a](https://github.com/smart-swimmingpool/monitor/commit/9b0ab7adc46a50ccc266a4e70bba0e459e9b7ca9))
+
+
+### Bug Fixes
+
+* code review findings — dangling reference, printf, trailing return type ([c6c3bc4](https://github.com/smart-swimmingpool/monitor/commit/c6c3bc4eab7e3e3d28f15c69b2f64a12b6c84e49))
+* cpplint header guard style in Version.h (SRC_VERSION_H_) ([685f6e1](https://github.com/smart-swimmingpool/monitor/commit/685f6e1ca5d90731059b0e2b99172d42100ef5e9))
+* **license:** add SPDX-License-Identifier to all source files ([61135d6](https://github.com/smart-swimmingpool/monitor/commit/61135d6a8d3dda5d8305c2760cb6c54b33b5f024))
+
 ## [Unreleased]
 
 ## [3.0.1] - 2026-06-27
diff --git a/platformio.ini b/platformio.ini
index 069732c..f208e52 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -34,7 +34,7 @@ lib_deps =
 build_flags =
   ${env.build_flags}
   ; FW_VERSION is auto-maintained by release-please — do not edit manually
-  '-DFW_VERSION="3.0.1"'
+  '-DFW_VERSION="3.1.0"'
   '-DGITHUB_REPO="smart-swimmingpool/monitor"'
   -D SERIAL_SPEED=${common.serial_speed}
   -D LILYGO_T5_V231
diff --git a/src/Version.h b/src/Version.h
index 0717619..cc898df 100644
--- a/src/Version.h
+++ b/src/Version.h
@@ -10,7 +10,7 @@
 #define SRC_VERSION_H_
 
 #ifndef FW_VERSION
-#define FW_VERSION "0.0.0"  // x-release-please-version
+#define FW_VERSION "3.1.0"  // x-release-please-version
 #endif
 
 #endif  // SRC_VERSION_H_