diff --git a/.claude/skills/quartz-integration/SKILL.md b/.claude/skills/quartz-integration/SKILL.md
index b81b04eab1..3a1002d806 100644
--- a/.claude/skills/quartz-integration/SKILL.md
+++ b/.claude/skills/quartz-integration/SKILL.md
@@ -7,7 +7,7 @@ description: Integration guide for using the Quartz Nostr KMP library in externa
 
 Reference for integrating `com.vitorpamplona.quartz:quartz` into external Nostr KMP projects.
 
-**Published artifact**: `com.vitorpamplona.quartz:quartz:1.12.2` (Maven Central)
+**Published artifact**: `com.vitorpamplona.quartz:quartz:1.12.3` (Maven Central)
 **Targets**: JVM 21+, Android (minSdk 21+), iOS (XCFramework `quartz-kmpKit`)
 **License**: MIT
 
@@ -19,7 +19,7 @@ Reference for integrating `com.vitorpamplona.quartz:quartz` into external Nostr
 
 ```toml
 [versions]
-quartz = "1.12.2"
+quartz = "1.12.3"
 
 [libraries]
 quartz = { module = "com.vitorpamplona.quartz:quartz", version.ref = "quartz" }
@@ -41,7 +41,7 @@ kotlin {
 
 ```kotlin
 dependencies {
-    implementation("com.vitorpamplona.quartz:quartz:1.12.2")
+    implementation("com.vitorpamplona.quartz:quartz:1.12.3")
 }
 ```
 
diff --git a/.claude/skills/quartz-integration/references/gradle-setup.md b/.claude/skills/quartz-integration/references/gradle-setup.md
index 176a5a788b..83662e5e6a 100644
--- a/.claude/skills/quartz-integration/references/gradle-setup.md
+++ b/.claude/skills/quartz-integration/references/gradle-setup.md
@@ -3,7 +3,7 @@
 ## Current version
 
 ```
-com.vitorpamplona.quartz:quartz:1.12.2
+com.vitorpamplona.quartz:quartz:1.12.3
 ```
 
 Check latest: https://central.sonatype.com/artifact/com.vitorpamplona.quartz/quartz
@@ -16,7 +16,7 @@ Check latest: https://central.sonatype.com/artifact/com.vitorpamplona.quartz/qua
 
 ```toml
 [versions]
-quartz = "1.12.2"
+quartz = "1.12.3"
 
 [libraries]
 quartz = { module = "com.vitorpamplona.quartz:quartz", version.ref = "quartz" }
@@ -55,7 +55,7 @@ kotlin {
 ```kotlin
 // build.gradle.kts (app module)
 dependencies {
-    implementation("com.vitorpamplona.quartz:quartz:1.12.2")
+    implementation("com.vitorpamplona.quartz:quartz:1.12.3")
 }
 ```
 
@@ -70,7 +70,7 @@ plugins {
 }
 
 dependencies {
-    implementation("com.vitorpamplona.quartz:quartz:1.12.2")
+    implementation("com.vitorpamplona.quartz:quartz:1.12.3")
     // JNA needed for libsodium (NIP-44) on JVM
     implementation("net.java.dev.jna:jna:5.18.1")
 }
diff --git a/README.md b/README.md
index f4ef3e3844..24326c5842 100644
--- a/README.md
+++ b/README.md
@@ -297,16 +297,16 @@ repositories {
 Add the following line to your `commonMain` dependencies:
 
 ```gradle
-implementation('com.vitorpamplona.quartz:quartz:1.12.2')
+implementation('com.vitorpamplona.quartz:quartz:1.12.3')
 ```
 
 Variations to each platform are also available:
 
 ```gradle
-implementation('com.vitorpamplona.quartz:quartz-android:1.12.2')
-implementation('com.vitorpamplona.quartz:quartz-jvm:1.12.2')
-implementation('com.vitorpamplona.quartz:quartz-iosarm64:1.12.2')
-implementation('com.vitorpamplona.quartz:quartz-iossimulatorarm64:1.12.2')
+implementation('com.vitorpamplona.quartz:quartz-android:1.12.3')
+implementation('com.vitorpamplona.quartz:quartz-jvm:1.12.3')
+implementation('com.vitorpamplona.quartz:quartz-iosarm64:1.12.3')
+implementation('com.vitorpamplona.quartz:quartz-iossimulatorarm64:1.12.3')
 ```
 
 Check versions on [MavenCentral](https://central.sonatype.com/search?q=com.vitorpamplona.quartz)
diff --git a/docs/changelog/README.md b/docs/changelog/README.md
index 4ec2262476..d4b237e5f6 100644
--- a/docs/changelog/README.md
+++ b/docs/changelog/README.md
@@ -2,6 +2,7 @@
 
 Release notes for Amethyst, one file per version. Files are named with zero-padded version numbers so they sort correctly in any file browser. Use [`TEMPLATE.md`](TEMPLATE.md) as the starting point for the next release.
 
+- [v1.12.3 — Relay Latency Health & a macOS Notarization Fix](v1.12.03.md)
 - [v1.12.2 — Road Events, Collapsable replies and some fixes](v1.12.02.md)
 - [v1.12.1 — Health Connect Workouts, Share as Image](v1.12.01.md)
 - [v1.12.0 — Payments, Private Posts & Workouts](v1.12.00.md)
diff --git a/docs/changelog/v1.12.03.md b/docs/changelog/v1.12.03.md
new file mode 100644
index 0000000000..b733454963
--- /dev/null
+++ b/docs/changelog/v1.12.03.md
@@ -0,0 +1,27 @@
+# v1.12.3: Relay Latency Health & a macOS Notarization Fix
+
+Highlights:
+
+- Tracks per-relay latency on Desktop and surfaces slow relays in the dashboard, a details popup, and a banner.
+- Fixes macOS notarization for the desktop DMG and the `amy` CLI tarball.
+
+## New Features
+
+### Relay Latency Health (Desktop)
+
+- Adds a per-relay latency tracker and a slow-relay classifier.
+- Wires the latency tracker into `RelayHealthStore` with persistence across launches.
+- Surfaces relay latency in the desktop dashboard, a relay-details popup, and an unhealthy-relay banner.
+
+## Build & Documentation
+
+- Fixes macOS notarization for the desktop DMG and the `amy` CLI tarball by signing the Mach-O native libraries bundled inside jars (secp256k1, SQLite, JNA, Skiko, jkeychain, and ComposeMediaPlayer) — Apple's notary service recurses into jars and had rejected them as unsigned.
+
+## Contributors
+
+- @npub1gcxzte5zlkncx26j68ez60fzkvtkm9e0vrwdcvsjakxf9mu9qewqlfnj5z
+- @npub12cfje6nl2nuxplcqfvhg7ljt89fmpj0n0fd24zxsukja5qm9wmtqd7y76c
+
+## Translations
+
+- _None this release._
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 7987e9005e..306a584524 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -2,8 +2,8 @@
 # Amethyst app version — single source of truth consumed by both Android (amethyst/)
 # and Desktop (desktopApp/). `appCode` is the Android versionCode: a monotonic
 # integer that must increment on every release, even when `app` is unchanged.
-app = "1.12.2"
-appCode = "450"
+app = "1.12.3"
+appCode = "451"
 accompanistAdaptive = "0.37.3"
 cachemapVersion = "0.2.4"
 composeMultiplatform = "1.11.1"