diff --git a/CHANGELOG.md b/CHANGELOG.md
index 656794d..1388390 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,13 @@ All notable changes to Buzznode are documented here, following
 
 ## [Unreleased]
 
+## [0.5.9] - 2026-07-31
+
+### Added
+
+- Update to Launcher desktop substrate `0.1.7` and register its shared health
+  and native-notification bridge interfaces.
+
 ## [0.5.8] - 2026-07-31
 
 ### Fixed
diff --git a/Dockerfile b/Dockerfile
index e4751a8..f224835 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -10,7 +10,7 @@
 # Buzznode connects to an existing relay and deliberately contains neither the
 # Buzz Desktop client nor local relay/backing services.
 
-ARG DESKTOP_IMAGE=ghcr.io/pdparchitect/launcher-image-base-desktop:0.1.6
+ARG DESKTOP_IMAGE=ghcr.io/pdparchitect/launcher-image-base-desktop:0.1.7
 
 # Upstream publishes a Linux package only for AMD64. Extract its headless tools
 # there; on ARM64, build the same immutable tag and exact commit from source.
diff --git a/Makefile b/Makefile
index b233586..dca8ef4 100644
--- a/Makefile
+++ b/Makefile
@@ -12,7 +12,7 @@ TARGETARCH ?= $(word 2,$(subst /, ,$(PLATFORM)))
 BUZZ_VERSION ?= 0.5.2
 BUZZ_DEB_SHA256 ?= 3f022bc31ed579e045946e6acab8483639bcb94e62c1e70f67b97b22f8f879c5
 BUZZ_SOURCE_SHA ?= 3e48f1b2365d326ee1c9582448d86a99b44ecd5d
-DESKTOP_IMAGE ?= ghcr.io/pdparchitect/launcher-image-base-desktop:0.1.6
+DESKTOP_IMAGE ?= ghcr.io/pdparchitect/launcher-image-base-desktop:0.1.7
 CODEX_VERSION ?= 0.145.0
 CLAUDE_CODE_VERSION ?= 2.1.220
 CODEX_ACP_VERSION ?= 1.1.7
@@ -90,6 +90,8 @@ check:
 	@grep -q '\[ -n "$${PS1:-}" \]' overlay/etc/bash.bashrc.d/buzznode-prompt.sh
 	@test "$$(jq -er '.schemaVersion' launcher/application.json)" = 2
 	@! jq -e 'has("image")' launcher/application.json >/dev/null
+	@jq -e '.interfaces.health.kind == "health" and .interfaces.health.port == 6902 and .interfaces.health.path == "/healthz"' launcher/application.json >/dev/null
+	@jq -e '.interfaces.notifications.kind == "notifications" and .interfaces.notifications.port == 6902 and .interfaces.notifications.path == "/notifications"' launcher/application.json >/dev/null
 	@jq -e '.interfaces.preview.kind == "preview" and .interfaces.preview.port == 6902 and .interfaces.preview.path == "/preview.jpg"' launcher/application.json >/dev/null
 	@for asset in $$(jq -er '.media.icon, .media.cover, .media.screenshots[].source' launcher/application.json); do \
 		test -f "launcher/$$asset"; \
diff --git a/VERSION b/VERSION
index 659914a..416bfb0 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-0.5.8
+0.5.9
diff --git a/launcher/application.json b/launcher/application.json
index ced454b..dbd0bd2 100644
--- a/launcher/application.json
+++ b/launcher/application.json
@@ -26,6 +26,16 @@
       "port": 6901,
       "path": "/"
     },
+    "health": {
+      "kind": "health",
+      "port": 6902,
+      "path": "/healthz"
+    },
+    "notifications": {
+      "kind": "notifications",
+      "port": 6902,
+      "path": "/notifications"
+    },
     "preview": {
       "kind": "preview",
       "port": 6902,