diff --git a/.github/workflows/dependency-refresh-tests.yml b/.github/workflows/dependency-refresh-tests.yml
index 5ae3c7a..d8187a1 100644
--- a/.github/workflows/dependency-refresh-tests.yml
+++ b/.github/workflows/dependency-refresh-tests.yml
@@ -3,7 +3,7 @@ name: Dependency Refresh Tests
 on:
   push:
     branches:
-      - feature/2-serializable-0.10.1-dependency-refresh
+      - feature/4-serializable-0.10.2-dependency-refresh
   pull_request:
     branches:
       - main
@@ -29,7 +29,7 @@ jobs:
       - uses: actions/checkout@v4
         with:
           repository: Flowduino/ESPressio-Serializable
-          ref: 0.10.1
+          ref: 0.10.2
           path: project/dependencies/ESPressio-Serializable
       - uses: actions/setup-python@v5
         with:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6bc387e..9cfaa2a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,26 @@ Versioning](https://semver.org/).
 > had little or no release-note detail, the entry is intentionally terse
 > rather than inferring unsupported intent.
 
+## [0.2.3] - 2026-08-21
+
+### Changed
+
+- Updated the optional ESPressio Serializable integration baseline from
+  `>= 0.10.1 < 1.0.0` to `>= 0.10.2 < 1.0.0`.
+- Updated PlatformIO examples and current dependency documentation to target
+  ESPressio Serializable 0.10.2.
+- Updated release-candidate CI to compile Serializable Unit variants against
+  the released ESPressio Serializable 0.10.2 tag.
+- Updated package metadata for ESPressio Units 0.2.3.
+
+### Compatibility
+
+- Ordinary Unit types remain dependency-free with respect to ESPressio
+  Serializable.
+- Serializable Unit variants remain opt-in and source-compatible.
+- No Units runtime or public API behaviour changes are introduced by this
+  dependency-maintenance release.
+
 ## [0.2.2] - 2026-08-20
 
 ### Changed
diff --git a/ESPRESSIO_DEPENDENCY_CHART.md b/ESPRESSIO_DEPENDENCY_CHART.md
index d5262d3..63e5aed 100644
--- a/ESPRESSIO_DEPENDENCY_CHART.md
+++ b/ESPRESSIO_DEPENDENCY_CHART.md
@@ -5,14 +5,14 @@
 ## Purpose
 
 This document describes the current ESPressio dependency hierarchy relevant to
-ESPressio Units 0.2.2.
+ESPressio Units 0.2.3.
 
 - **Solid arrow** — required dependency.
 - **Dashed arrow** — opt-in dependency activated only when the associated
   integration/header is selected.
 - Arrows point from the dependent library to the library it consumes.
 
-## ESPressio Units 0.2.2
+## ESPressio Units 0.2.3
 
 **Required ESPressio dependencies: none.**
 
@@ -20,8 +20,8 @@ Ordinary Unit types remain standalone. Serializable variants are explicitly
 opt-in:
 
 ```text
-ESPressio Units 0.2.2
-    - - -> ESPressio Serializable >= 0.10.1 < 1.0.0
+ESPressio Units 0.2.3
+    - - -> ESPressio Serializable >= 0.10.2 < 1.0.0
             Serializable Unit variants only
 ```
 
@@ -30,8 +30,8 @@ ESPressio Units 0.2.2
 ```text
 FOUNDATIONAL
 ├── Observable 3.0.1
-├── Serializable 0.10.1
-├── Units 0.2.2
+├── Serializable 0.10.2
+├── Units 0.2.3
 ├── Security 0.2.0
 └── Command 0.3.0
 
@@ -51,14 +51,14 @@ TRANSPORT / INTEGRATION
 └── Event 5.8.1
 
 DIAGNOSTICS / OPERATOR
-└── Serial 0.5.1
+└── Serial 0.5.1 (release candidate)
 ```
 
 ### Important opt-in relationships
 
 ```text
 Units
-  - - -> Serializable >= 0.10.1 < 1.0.0
+  - - -> Serializable >= 0.10.2 < 1.0.0
          Serializable Unit variants
 
 Sockets
@@ -101,7 +101,7 @@ The intended ESPressio rule is that integration dependencies cascade only
 upstream library, but an upstream library should not acquire a reverse
 dependency merely to host an integration.
 
-There is one currently known reciprocal optional relationship:
+There are two currently known reciprocal optional relationships:
 
 ```text
 ESP-Now - - -> Event
@@ -111,11 +111,23 @@ Event - - -> ESP-Now
     ESPNowTransportEventBridge
 ```
 
-Although both edges are opt-in, together they form an architectural cycle. The
+and:
+
+```text
+Sockets - - -> Event
+    socket Event transports
+
+Event - - -> Sockets
+    SocketWorkerEventBridge
+    SocketSecuritySessionEventBridge
+```
+
+Although these edges are opt-in, each pair forms an architectural cycle. The
 preferred resolution is to keep Event transport-neutral and move the
-ESP-Now-specific Observer-to-Event bridge downstream into ESP-Now's Event
-integration (or a dedicated downstream integration package). No new reciprocal
-dependency should be introduced while that relocation remains outstanding.
+transport-specific Observer-to-Event bridges downstream alongside the concrete
+transport library's Event integration (or into a dedicated downstream
+integration package). No new reciprocal dependency should be introduced while
+those relocations remain outstanding.
 
 ## Architectural principle
 
diff --git a/README.md b/README.md
index 63a2c77..e14119f 100644
--- a/README.md
+++ b/README.md
@@ -5,10 +5,10 @@ Flowduino ESPressio Development Platform.
 
 ## Current Version
 
-**0.2.2**
+**0.2.3**
 
-Version 0.2.2 refreshes the optional Serializable Unit integration baseline to
-**ESPressio Serializable >= 0.10.1 < 1.0.0**. Ordinary Unit types remain
+Version 0.2.3 refreshes the optional Serializable Unit integration baseline to
+**ESPressio Serializable >= 0.10.2 < 1.0.0**. Ordinary Unit types remain
 independent of Serializable.
 
 ## ESPressio Development Platform
@@ -57,7 +57,7 @@ counterparts are exposed through separate `*_Serializable.hpp` headers
 and `ESPressio_SerializableUnits.hpp`; only applications selecting those
 types acquire the dependency.
 
-Serializable Unit variants target **ESPressio Serializable >= 0.10.1 < 1.0.0**,
+Serializable Unit variants target **ESPressio Serializable >= 0.10.2 < 1.0.0**,
 allowing compatible later 0.x patch releases while preventing an automatic
 transition to a future 1.x breaking release.
 
@@ -67,15 +67,15 @@ Core Units usage:
 
 ```ini
 lib_deps =
-    https://github.com/flowduino/ESPressio-Units@^0.2.2
+    https://github.com/flowduino/ESPressio-Units@^0.2.3
 ```
 
 When using the optional Serializable Unit variants:
 
 ```ini
 lib_deps =
-    https://github.com/flowduino/ESPressio-Units@^0.2.2
-    https://github.com/flowduino/ESPressio-Serializable@^0.10.1
+    https://github.com/flowduino/ESPressio-Units@^0.2.3
+    https://github.com/flowduino/ESPressio-Serializable@^0.10.2
 ```
 
 ## Namespace
@@ -164,7 +164,7 @@ ordinary Unit
 
 Serializable Unit
     -> Units
-    -> Serializable >= 0.10.1 < 1.0.0
+    -> Serializable >= 0.10.2 < 1.0.0
 ```
 
 This is particularly important to Timing: Timing can use either ordinary
diff --git a/library.json b/library.json
index 35adccf..77090c6 100644
--- a/library.json
+++ b/library.json
@@ -17,7 +17,7 @@
         "type": "git",
         "url": "https://github.com/Flowduino/ESPressio-Units.git"
     },
-    "version": "0.2.2",
+    "version": "0.2.3",
     "license": "Apache-2.0",
     "frameworks": "arduino",
     "platforms": "*",
diff --git a/library.properties b/library.properties
index ab3dcac..ef8cc4c 100644
--- a/library.properties
+++ b/library.properties
@@ -1,5 +1,5 @@
 name=Flowduino ESPressio-Units
-version=0.2.2
+version=0.2.3
 author=Simon J. Stuart
 maintainer=Flowduino.com
 sentence=Strongly-typed SI unit and physical quantity library intended for use with microcontrollers