diff --git a/frontend/Dockerfile b/frontend/Dockerfile
index 1c7d16b8..db153277 100644
--- a/frontend/Dockerfile
+++ b/frontend/Dockerfile
@@ -1,7 +1,9 @@
 FROM node:20-alpine AS deps
 WORKDIR /app
 COPY package.json package-lock.json* ./
-RUN npm ci || npm install
+# --legacy-peer-deps allows install to succeed despite peer dep mismatches
+# (Tailwind 4 alpha + React 19 peer deps tend to be strict).
+RUN npm ci --legacy-peer-deps || npm install --legacy-peer-deps
 
 FROM node:20-alpine AS builder
 WORKDIR /app
diff --git a/frontend/package.json b/frontend/package.json
index aca9fbac..edfda58a 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -16,7 +16,7 @@
     "react-dom": "^19.0.0",
     "@tanstack/react-query": "^5.50.0",
     "leaflet": "^1.9.4",
-    "react-leaflet": "^4.2.1",
+    "react-leaflet": "^5.0.0",
     "leaflet-draw": "^1.0.4"
   },
   "devDependencies": {