diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..8e57635
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,57 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+## [Unreleased]
+
+---
+
+## [1.0.0] — 2025-01-27
+
+### 🎉 Initial MVP Release
+
+First stable release of TimeToLeave: a smart departure planner that integrates
+your calendar with real-time public transport data to tell you exactly when to leave.
+
+### Web Application
+
+- Next.js 16 web dashboard with Tailwind CSS 4
+- Calendar sync via `.ics` file import or URL
+- Station search and journey planning for upcoming events
+- Real-time departures with dynamic leave-status countdown
+- Browser-based leave reminders with push notifications
+- Dark/light theme toggle
+- Debounced search and optimized calendar loading
+- Docker support with multi-stage build and standalone output
+
+### Mobile Application
+
+- React Native 0.81 / Expo 54 mobile client
+- Five-screen navigation: Event List, Add Event, Event Detail, Origin Setup, Settings
+- Native calendar import via `expo-calendar`
+- Geolocation-based origin detection via `expo-location`
+- Local push notifications via `expo-notifications`
+- Persistent settings and state via AsyncStorage
+
+### Public Transport Integration
+
+- HAFAS protocol support for Austrian railway (ÖBB) real-time departures
+- WienerLinien integration for Vienna U-Bahn, tram, and bus departures
+- Accurate timezone-aware HAFAS time parsing with DST transition handling for `Europe/Vienna`
+- Support for repeated stop IDs and multiple connections
+
+### Routing
+
+- Bike route calculation from origin to departure station via OSRM
+- Geocoding API integration for station lookups
+- Fallback and caching logic for API failures
+
+### Shared Infrastructure
+
+- Monorepo structure with npm workspaces
+- `@timetoleave/core` — shared types, countdown utilities, and leave-status logic
+- `@timetoleave/api-client` — typed client for HAFAS, calendar, geocoding, and bike routing
+- Correlation IDs for request tracing and monitoring
+- Comprehensive test coverage across web (Vitest) and mobile (Jest)
+- Strict TypeScript type-checking across all workspaces
+- ESLint linting across the codebase
diff --git a/apps/web/package.json b/apps/web/package.json
index 7c6b43b..9239ffb 100644
--- a/apps/web/package.json
+++ b/apps/web/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@timetoleave/web",
-  "version": "0.1.0",
+  "version": "1.0.0"
   "private": true,
   "scripts": {
     "dev": "next dev",
diff --git a/package.json b/package.json
index 514537e..ea5d731 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "time-to-leave",
-  "version": "0.1.0",
+  "version": "1.0.0"
   "private": true,
   "workspaces": [
     "apps/*",
diff --git a/packages/api-client/package.json b/packages/api-client/package.json
index 00cd332..d369ba9 100644
--- a/packages/api-client/package.json
+++ b/packages/api-client/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@timetoleave/api-client",
-  "version": "0.1.0",
+  "version": "1.0.0"
   "private": true,
   "main": "src/index.ts",
   "types": "src/index.ts",
diff --git a/packages/core/package.json b/packages/core/package.json
index 36790b2..cf84784 100644
--- a/packages/core/package.json
+++ b/packages/core/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@timetoleave/core",
-  "version": "0.1.0",
+  "version": "1.0.0"
   "private": true,
   "main": "src/index.ts",
   "types": "src/index.ts",