diff --git a/apps/chat/apps/mobile/package.json b/apps/chat/apps/mobile/package.json
index 057786a7f..5d2f0cfcb 100644
--- a/apps/chat/apps/mobile/package.json
+++ b/apps/chat/apps/mobile/package.json
@@ -22,30 +22,30 @@
 		"@react-navigation/bottom-tabs": "^7.0.5",
 		"@react-navigation/drawer": "^7.0.0",
 		"@react-navigation/native": "^7.0.3",
-		"expo": "^52.0.39",
-		"expo-constants": "~17.0.8",
-		"expo-dev-client": "~5.0.4",
-		"expo-dev-launcher": "^5.0.17",
-		"expo-linking": "~7.0.5",
-		"expo-router": "~4.0.6",
-		"expo-status-bar": "~2.0.1",
-		"expo-system-ui": "~4.0.8",
-		"expo-web-browser": "~14.0.2",
-		"nativewind": "latest",
+		"expo": "~55.0.5",
+		"expo-constants": "~55.0.7",
+		"expo-dev-client": "^6.0.13",
+		"expo-dev-launcher": "^6.0.13",
+		"expo-linking": "~55.0.7",
+		"expo-router": "~55.0.5",
+		"expo-status-bar": "~55.0.4",
+		"expo-system-ui": "~55.0.9",
+		"expo-web-browser": "~55.0.9",
+		"nativewind": "~4.2.3",
 		"node-fetch": "^2.7.0",
-		"react": "18.3.1",
-		"react-dom": "18.3.1",
-		"react-native": "0.76.7",
-		"react-native-gesture-handler": "~2.20.2",
+		"react": "19.2.0",
+		"react-dom": "19.2.0",
+		"react-native": "0.83.2",
+		"react-native-gesture-handler": "~2.28.0",
 		"react-native-markdown-display": "^7.0.2",
-		"react-native-reanimated": "3.16.2",
-		"react-native-safe-area-context": "4.12.0",
-		"react-native-screens": "~4.4.0",
-		"react-native-web": "~0.19.10"
+		"react-native-reanimated": "~4.1.5",
+		"react-native-safe-area-context": "~5.6.0",
+		"react-native-screens": "~4.16.0",
+		"react-native-web": "~0.21.0"
 	},
 	"devDependencies": {
 		"@babel/core": "^7.20.0",
-		"@types/react": "~18.3.12",
+		"@types/react": "~19.1.0",
 		"@typescript-eslint/eslint-plugin": "^7.7.0",
 		"@typescript-eslint/parser": "^7.7.0",
 		"dotenv": "^16.4.7",
diff --git a/apps/context/apps/mobile/package.json b/apps/context/apps/mobile/package.json
index 261578753..e7707d233 100644
--- a/apps/context/apps/mobile/package.json
+++ b/apps/context/apps/mobile/package.json
@@ -23,38 +23,38 @@
 		"@react-native-async-storage/async-storage": "^1.23.1",
 		"@react-native-picker/picker": "^2.11.0",
 		"@react-navigation/native": "^7.0.3",
-		"expo": "^52.0.46",
-		"expo-constants": "~17.0.8",
-		"expo-dev-client": "~5.0.4",
-		"expo-dev-launcher": "^5.0.17",
+		"expo": "~55.0.5",
+		"expo-constants": "~55.0.7",
+		"expo-dev-client": "^6.0.13",
+		"expo-dev-launcher": "^6.0.13",
 		"expo-font": "^14.0.10",
-		"expo-linking": "~7.0.5",
+		"expo-linking": "~55.0.7",
 		"expo-localization": "^16.1.6",
-		"expo-router": "~4.0.6",
-		"expo-status-bar": "~2.0.1",
-		"expo-system-ui": "~4.0.9",
-		"expo-secure-store": "~14.0.1",
-		"expo-web-browser": "~14.0.2",
+		"expo-router": "~55.0.5",
+		"expo-status-bar": "~55.0.4",
+		"expo-system-ui": "~55.0.9",
+		"expo-secure-store": "~55.0.8",
+		"expo-web-browser": "~55.0.9",
 		"i18next": "^25.3.2",
-		"nativewind": "latest",
-		"react": "18.3.1",
-		"react-dom": "18.3.1",
+		"nativewind": "~4.2.3",
+		"react": "19.2.0",
+		"react-dom": "19.2.0",
 		"react-i18next": "^15.6.0",
-		"react-native": "0.76.9",
-		"react-native-gesture-handler": "~2.20.2",
+		"react-native": "0.83.2",
+		"react-native-gesture-handler": "~2.28.0",
 		"react-native-markdown-display": "^7.0.2",
 		"react-native-pager-view": "^6.7.0",
 		"react-native-purchases": "^8.9.5",
-		"react-native-reanimated": "3.16.2",
-		"react-native-safe-area-context": "4.12.0",
-		"react-native-screens": "~4.4.0",
+		"react-native-reanimated": "~4.1.5",
+		"react-native-safe-area-context": "~5.6.0",
+		"react-native-screens": "~4.16.0",
 		"react-native-tab-view": "^4.0.10",
-		"react-native-web": "~0.19.10"
+		"react-native-web": "~0.21.0"
 	},
 	"devDependencies": {
 		"@babel/core": "^7.20.0",
 		"@types/node": "^24.10.1",
-		"@types/react": "~18.3.12",
+		"@types/react": "~19.1.0",
 		"@typescript-eslint/eslint-plugin": "^7.7.0",
 		"@typescript-eslint/parser": "^7.7.0",
 		"eslint": "^8.57.0",
diff --git a/apps/manacore/apps/mobile/package.json b/apps/manacore/apps/mobile/package.json
index 14913d4fe..0c456fe14 100644
--- a/apps/manacore/apps/mobile/package.json
+++ b/apps/manacore/apps/mobile/package.json
@@ -22,29 +22,29 @@
 		"@react-navigation/drawer": "^7.0.0",
 		"@react-navigation/native": "^7.0.3",
 		"@manacore/shared-auth": "workspace:*",
-		"expo": "^54.0.25",
-		"expo-secure-store": "^15.0.7",
-		"expo-constants": "~18.0.10",
-		"expo-dev-client": "~6.0.18",
-		"expo-dev-launcher": "^5.0.17",
-		"expo-linking": "~8.0.9",
-		"expo-router": "~6.0.15",
-		"expo-status-bar": "~3.0.8",
-		"expo-system-ui": "~6.0.8",
-		"expo-web-browser": "~15.0.9",
-		"nativewind": "latest",
-		"react": "19.1.0",
-		"react-dom": "19.1.0",
-		"react-native": "0.81.5",
+		"expo": "~55.0.5",
+		"expo-secure-store": "~55.0.8",
+		"expo-constants": "~55.0.7",
+		"expo-dev-client": "^6.0.13",
+		"expo-dev-launcher": "^6.0.13",
+		"expo-linking": "~55.0.7",
+		"expo-router": "~55.0.5",
+		"expo-status-bar": "~55.0.4",
+		"expo-system-ui": "~55.0.9",
+		"expo-web-browser": "~55.0.9",
+		"nativewind": "~4.2.3",
+		"react": "19.2.0",
+		"react-dom": "19.2.0",
+		"react-native": "0.83.2",
 		"react-native-gesture-handler": "~2.28.0",
-		"react-native-reanimated": "4.1.5",
-		"react-native-safe-area-context": "5.6.2",
+		"react-native-reanimated": "~4.1.5",
+		"react-native-safe-area-context": "~5.6.0",
 		"react-native-screens": "~4.16.0",
-		"react-native-web": "~0.21.2"
+		"react-native-web": "~0.21.0"
 	},
 	"devDependencies": {
 		"@babel/core": "^7.20.0",
-		"@types/react": "^19.2.3",
+		"@types/react": "~19.1.0",
 		"@types/react-dom": "^19.2.3",
 		"@typescript-eslint/eslint-plugin": "^7.7.0",
 		"@typescript-eslint/parser": "^7.7.0",
diff --git a/apps/manadeck/apps/mobile/package.json b/apps/manadeck/apps/mobile/package.json
index 69ca12bda..4533ada7d 100644
--- a/apps/manadeck/apps/mobile/package.json
+++ b/apps/manadeck/apps/mobile/package.json
@@ -26,41 +26,41 @@
 		"@react-navigation/native": "^7.0.3",
 		"base64-js": "^1.5.1",
 		"class-variance-authority": "^0.7.1",
-		"expo": "54.0.13",
+		"expo": "~55.0.5",
 		"expo-blur": "~15.0.7",
 		"expo-build-properties": "~1.0.9",
-		"expo-constants": "~18.0.9",
-		"expo-dev-client": "~6.0.13",
+		"expo-constants": "~55.0.7",
+		"expo-dev-client": "^6.0.13",
 		"expo-device": "~8.0.9",
-		"expo-file-system": "~19.0.15",
+		"expo-file-system": "~55.0.10",
 		"expo-font": "~14.0.9",
-		"expo-image-picker": "~17.0.8",
-		"expo-linking": "~8.0.8",
-		"expo-router": "~6.0.10",
-		"expo-secure-store": "^15.0.7",
-		"expo-status-bar": "~3.0.8",
+		"expo-image-picker": "~55.0.12",
+		"expo-linking": "~55.0.7",
+		"expo-router": "~55.0.5",
+		"expo-secure-store": "~55.0.8",
+		"expo-status-bar": "~55.0.4",
 		"expo-symbols": "~1.0.7",
-		"expo-system-ui": "~6.0.7",
+		"expo-system-ui": "~55.0.9",
 		"expo-updates": "~29.0.12",
-		"expo-web-browser": "~15.0.8",
-		"nativewind": "^4.2.1",
-		"react": "19.1.0",
-		"react-dom": "19.1.0",
-		"react-native": "0.81.4",
+		"expo-web-browser": "~55.0.9",
+		"nativewind": "~4.2.3",
+		"react": "19.2.0",
+		"react-dom": "19.2.0",
+		"react-native": "0.83.2",
 		"react-native-calendars": "^1.1313.0",
 		"react-native-draggable-flatlist": "^4.0.3",
 		"react-native-gesture-handler": "~2.28.0",
-		"react-native-reanimated": "~4.1.1",
+		"react-native-reanimated": "~4.1.5",
 		"react-native-safe-area-context": "~5.6.0",
 		"react-native-screens": "~4.16.0",
 		"react-native-svg": "15.12.1",
-		"react-native-web": "^0.21.0",
+		"react-native-web": "~0.21.0",
 		"react-native-worklets": "0.5.1",
 		"zustand": "^5.0.8"
 	},
 	"devDependencies": {
 		"@babel/core": "^7.20.0",
-		"@types/react": "^19.2.3",
+		"@types/react": "~19.1.0",
 		"@types/react-dom": "^19.2.3",
 		"ajv": "^8.12.0",
 		"eslint": "^9.25.1",
diff --git a/apps/picture/apps/mobile/package.json b/apps/picture/apps/mobile/package.json
index 200a4d2c1..63c35c373 100644
--- a/apps/picture/apps/mobile/package.json
+++ b/apps/picture/apps/mobile/package.json
@@ -26,35 +26,35 @@
 		"@react-native-async-storage/async-storage": "2.2.0",
 		"@react-navigation/native": "^7.0.3",
 		"blurhash": "^2.0.5",
-		"expo": "54.0.12",
+		"expo": "~55.0.5",
 		"expo-blur": "~15.0.7",
 		"expo-clipboard": "~8.0.7",
-		"expo-constants": "~18.0.9",
-		"expo-file-system": "~19.0.16",
-		"expo-haptics": "~15.0.7",
-		"expo-image": "~3.0.9",
+		"expo-constants": "~55.0.7",
+		"expo-file-system": "~55.0.10",
+		"expo-haptics": "~55.0.8",
+		"expo-image": "~55.0.6",
 		"expo-linear-gradient": "~15.0.7",
-		"expo-linking": "~8.0.8",
-		"expo-location": "~19.0.7",
-		"expo-media-library": "~18.2.0",
-		"expo-router": "~6.0.10",
-		"expo-secure-store": "~15.0.7",
+		"expo-linking": "~55.0.7",
+		"expo-location": "~55.0.6",
+		"expo-media-library": "~55.0.9",
+		"expo-router": "~55.0.5",
+		"expo-secure-store": "~55.0.8",
 		"expo-sharing": "~14.0.7",
-		"expo-status-bar": "~3.0.8",
+		"expo-status-bar": "~55.0.4",
 		"expo-symbols": "^1.0.7",
-		"expo-system-ui": "~6.0.7",
-		"expo-web-browser": "~15.0.8",
-		"nativewind": "^4.2.1",
-		"react": "19.1.0",
-		"react-dom": "19.1.0",
-		"react-native": "0.81.4",
+		"expo-system-ui": "~55.0.9",
+		"expo-web-browser": "~55.0.9",
+		"nativewind": "~4.2.3",
+		"react": "19.2.0",
+		"react-dom": "19.2.0",
+		"react-native": "0.83.2",
 		"react-native-context-menu-view": "^1.20.0",
 		"react-native-gesture-handler": "~2.28.0",
 		"react-native-pager-view": "6.9.1",
-		"react-native-reanimated": "~4.1.1",
+		"react-native-reanimated": "~4.1.5",
 		"react-native-safe-area-context": "~5.6.0",
 		"react-native-screens": "~4.16.0",
-		"react-native-web": "^0.21.0",
+		"react-native-web": "~0.21.0",
 		"react-native-worklets": "^0.6.0",
 		"react-native-zoom-toolkit": "^5.0.1",
 		"zustand": "^4.5.1"
@@ -63,7 +63,7 @@
 		"@babel/core": "^7.20.0",
 		"@babel/plugin-syntax-dynamic-import": "^7.8.3",
 		"@babel/plugin-syntax-import-meta": "^7.10.4",
-		"@types/react": "~19.2.0",
+		"@types/react": "~19.1.0",
 		"ajv": "^8.12.0",
 		"babel-plugin-module-resolver": "^5.0.2",
 		"babel-plugin-transform-remove-console": "^6.9.4",
diff --git a/apps/traces/apps/mobile/package.json b/apps/traces/apps/mobile/package.json
index cf77bfafd..c4c587dff 100644
--- a/apps/traces/apps/mobile/package.json
+++ b/apps/traces/apps/mobile/package.json
@@ -21,25 +21,25 @@
 		"@react-native-async-storage/async-storage": "2.2.0",
 		"@react-native-community/slider": "5.0.1",
 		"@react-navigation/native": "^7.0.3",
-		"expo": "~54.0.0",
-		"expo-background-fetch": "~14.0.7",
-		"expo-background-task": "~1.0.8",
-		"expo-constants": "~18.0.0",
+		"expo": "~55.0.5",
+		"expo-background-fetch": "~55.0.4",
+		"expo-background-task": "~55.0.4",
+		"expo-constants": "~55.0.7",
 		"expo-dev-client": "^6.0.13",
 		"expo-dev-launcher": "^6.0.13",
-		"expo-location": "~19.0.0",
-		"expo-media-library": "~18.2.0",
-		"expo-router": "~6.0.0",
-		"expo-status-bar": "~3.0.0",
-		"expo-system-ui": "~6.0.7",
-		"expo-task-manager": "~14.0.0",
-		"nativewind": "latest",
-		"react": "19.1.0",
-		"react-dom": "19.1.0",
-		"react-native": "0.81.4",
+		"expo-location": "~55.0.6",
+		"expo-media-library": "~55.0.9",
+		"expo-router": "~55.0.5",
+		"expo-status-bar": "~55.0.4",
+		"expo-system-ui": "~55.0.9",
+		"expo-task-manager": "~55.0.4",
+		"nativewind": "~4.2.3",
+		"react": "19.2.0",
+		"react-dom": "19.2.0",
+		"react-native": "0.83.2",
 		"react-native-gesture-handler": "~2.28.0",
 		"react-native-maps": "1.20.1",
-		"react-native-reanimated": "~4.1.1",
+		"react-native-reanimated": "~4.1.5",
 		"react-native-worklets": "~0.6.1",
 		"react-native-safe-area-context": "~5.6.0",
 		"react-native-screens": "~4.16.0",
diff --git a/docs/EXPO_SDK_UPGRADE.md b/docs/EXPO_SDK_UPGRADE.md
new file mode 100644
index 000000000..2e21d28ab
--- /dev/null
+++ b/docs/EXPO_SDK_UPGRADE.md
@@ -0,0 +1,85 @@
+# Expo SDK Upgrade Guide
+
+**Current State (2026-03-28):**
+
+| App | Expo SDK | React Native | Router | Status |
+|-----|----------|-------------|--------|--------|
+| matrix | **55** | 0.83.2 | ~55.0.5 | Target version |
+| manacore | 54 | 0.81.5 | ~6.0.15 | Needs upgrade |
+| manadeck | 54 | 0.81.4 | ~6.0.10 | Needs upgrade |
+| picture | 54 | 0.81.4 | ~6.0.10 | Needs upgrade |
+| traces | 54 | 0.81.4 | ~6.0.0 | Needs upgrade |
+| chat | **52** | 0.76.7 | ~4.0.6 | Needs upgrade (2 majors!) |
+| context | **52** | 0.76.9 | ~4.0.6 | Needs upgrade (2 majors!) |
+
+**Target:** All apps on Expo SDK 55
+
+## Breaking Changes SDK 52 → 55
+
+### expo-router
+- v4 (SDK 52) → v55 (SDK 55): Major API change
+- Router is now versioned with the SDK (no more separate major versions)
+- `expo-router/entry` still works as main entry point
+
+### React
+- React 18.3 → React 19.2
+- New `use()` hook, improved Suspense
+
+### React Native
+- 0.76 → 0.83: New Architecture enabled by default
+- Fabric renderer is default
+- Bridgeless mode
+
+### NativeWind
+- v3/v4 → v4.2.3: Should be compatible if already on v4
+
+## Upgrade Steps (Per App)
+
+```bash
+# 1. Use Expo upgrade tool
+cd apps/{app}/apps/mobile
+npx expo install expo@~55.0.5 --fix
+
+# 2. This auto-upgrades compatible dependencies
+# For manual deps, use:
+npx expo install react-native@0.83.2 react@19.2.0 expo-router@~55.0.5
+
+# 3. Update NativeWind
+npx expo install nativewind@~4.2.3
+
+# 4. Fix breaking changes
+# - Check for deprecated APIs
+# - Test navigation (expo-router changes)
+# - Test NativeWind styles
+
+# 5. Clear caches and test
+npx expo start -c
+```
+
+## Recommended Upgrade Order
+
+1. **traces** (simplest app, minimal deps)
+2. **manadeck** (medium complexity)
+3. **picture** (has image handling)
+4. **manacore** (hub app, important)
+5. **context** (SDK 52 → 55, bigger jump)
+6. **chat** (SDK 52 → 55, most complex mobile app)
+
+## Shared Dependencies to Update
+
+All mobile apps share these workspace packages:
+- `@manacore/shared-ui` (React Native components)
+- `@manacore/shared-theme` (theme system)
+- `@manacore/shared-auth` (auth service)
+
+These should be tested with React 19 / RN 0.83 before upgrading apps.
+
+## Testing Checklist (Per App)
+
+- [ ] App starts without errors (`npx expo start`)
+- [ ] Navigation works (all routes)
+- [ ] Auth flow (login, logout, token refresh)
+- [ ] NativeWind styles render correctly
+- [ ] App-specific features work
+- [ ] iOS simulator test
+- [ ] Android emulator test (if applicable)