diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1ba1309..f0bb669 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Changelog
 
+## v0.12.1 — 2026-09-25 07:57
+
+- Hotfix for the v0.12.0 bootstrap crash (`UnknownDependenciesException`): `MeshModule` now exports `MeshService`, and `WeatherService`'s `import type { MeshService }` became a value import — with `emitDecoratorMetadata` the type-only import is erased, so the constructor's DI token was `undefined` at runtime even with the export (the unit suite instantiates services directly and never booted the module graph, which is why 58 green tests still shipped a broken app).
+- `docker-compose.yml`: `WEATHER_CRON` passthrough (`${WEATHER_CRON:-}`) mirroring the existing notify-var pattern — empty/unset falls back to the service default `'0 * * * *'`. No LAT/LON/CITY passthroughs (service-side defaults suffice).
+- New DI smoke spec `src/weather/di.spec.ts`: compiles `WeatherModule` with Nest's `Test.createTestingModule().compile()` (no `app.init()`, so no TCP connection) and asserts `WeatherService` resolves its `MeshService` from `MeshModule` — fails if the export regresses.
+
 ## v0.12.0 — 2026-09-25 07:42
 
 - New `src/weather` module: hourly cron-triggered weather report for Lublin, broadcast on the mesh (pinned send channel). `WeatherService.fetchWeather()` GETs Open-Meteo current conditions (`temperature_2m`, `apparent_temperature`, `relative_humidity_2m`, `wind_speed_10m`, `weather_code` — free API, no key) via global fetch; `formatReport()` renders one short line (e.g. `Lublin weather: 18°C (feels 17), partly cloudy, humidity 65%, wind 12 km/h`) with a WMO weather-code → description map (~19 common codes, unknown → `code <n>`). The `@Cron` handler fetches, formats and broadcasts via `MeshService.sendText(BROADCAST_ADDR, report)`; any error logs `[weather] report failed: ...` and is swallowed — the cron never crashes the app.
diff --git a/docker-compose.yml b/docker-compose.yml
index fccc94a..9882176 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -8,6 +8,7 @@ services:
       MESH_POLL_MS: '1000'
       MESH_NOTIFY_URL: ${MESH_NOTIFY_URL:-}
       MESH_NOTIFY_CHANNEL: '${MESH_NOTIFY_CHANNEL:-3}'
+      WEATHER_CRON: ${WEATHER_CRON:-}
     volumes:
       - mesh_data:/app/data
     restart: unless-stopped
diff --git a/package.json b/package.json
index 8271564..5cc1dc9 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "mesh-bot",
-  "version": "0.12.0",
+  "version": "0.12.1",
   "description": "",
   "author": "",
   "private": true,
diff --git a/src/mesh/mesh.module.ts b/src/mesh/mesh.module.ts
index aa9cbbf..bc945c3 100644
--- a/src/mesh/mesh.module.ts
+++ b/src/mesh/mesh.module.ts
@@ -23,5 +23,6 @@ function openMessageDb(): DatabaseSync {
       useFactory: () => new MeshService(openMessageDb()),
     },
   ],
+  exports: [MeshService],
 })
 export class MeshModule {}
diff --git a/src/weather/di.spec.ts b/src/weather/di.spec.ts
new file mode 100644
index 0000000..2a142b7
--- /dev/null
+++ b/src/weather/di.spec.ts
@@ -0,0 +1,17 @@
+import { Test } from '@nestjs/testing';
+import { describe, expect, it } from 'vitest';
+import { MeshService } from '../mesh/mesh.service.js';
+import { WeatherModule } from './weather.module.js';
+import { WeatherService } from './weather.service.js';
+
+describe('DI wiring (module graph)', () => {
+  // compile() instantiates providers but does not run lifecycle hooks, so no TCP connection is opened.
+  it('resolves WeatherService with MeshService provided by MeshModule', async () => {
+    process.env.MESH_DB_PATH = ':memory:'; // keep openMessageDb from touching the repo's ./data
+    const moduleRef = await Test.createTestingModule({
+      imports: [WeatherModule],
+    }).compile();
+    expect(moduleRef.get(WeatherService)).toBeInstanceOf(WeatherService);
+    expect(moduleRef.get(MeshService)).toBeInstanceOf(MeshService);
+  });
+});
diff --git a/src/weather/weather.service.ts b/src/weather/weather.service.ts
index dea85dc..6caa40e 100644
--- a/src/weather/weather.service.ts
+++ b/src/weather/weather.service.ts
@@ -1,7 +1,7 @@
 import { Injectable, Logger } from '@nestjs/common';
 import { Cron } from '@nestjs/schedule';
 import { BROADCAST_ADDR } from '../mesh/codec.js';
-import type { MeshService } from '../mesh/mesh.service.js';
+import { MeshService } from '../mesh/mesh.service.js';
 
 /** Open-Meteo `current` block fields we use (free API, no key). */
 export interface CurrentWeather {