diff --git a/.gitea/workflows/release.yaml b/.gitea/workflows/release.yaml
index 1280e9c..f6bc680 100644
--- a/.gitea/workflows/release.yaml
+++ b/.gitea/workflows/release.yaml
@@ -135,6 +135,35 @@ jobs:
           cache-from: type=registry,ref=${{ secrets.DOCKER_USER }}/libnovel-runner:latest
           cache-to: type=inline
 
+  # ── ui: source map upload ─────────────────────────────────────────────────────
+  # Builds the UI with source maps and uploads them to GlitchTip so that error
+  # stack traces resolve to original .svelte/.ts file names and line numbers.
+  # Runs in parallel with docker-ui (both need check-ui to pass first).
+  upload-sourcemaps:
+    name: Upload source maps
+    runs-on: ubuntu-latest
+    needs: [check-ui]
+    defaults:
+      run:
+        working-directory: ui
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: "22"
+          cache: npm
+          cache-dependency-path: ui/package-lock.json
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Build with source maps and upload to GlitchTip
+        env:
+          SENTRY_AUTH_TOKEN: ${{ secrets.GLITCHTIP_AUTH_TOKEN }}
+          BUILD_VERSION: ${{ gitea.ref_name }}
+        run: npm run build
+
   # ── docker: ui ────────────────────────────────────────────────────────────────
   docker-ui:
     name: Docker / ui
@@ -213,7 +242,7 @@ jobs:
   release:
     name: Gitea Release
     runs-on: ubuntu-latest
-    needs: [docker-backend, docker-runner, docker-ui, docker-caddy]
+    needs: [docker-backend, docker-runner, docker-ui, docker-caddy, upload-sourcemaps]
     steps:
       - uses: actions/checkout@v4
         with:
diff --git a/ui/package-lock.json b/ui/package-lock.json
index b431e22..f2bf992 100644
--- a/ui/package-lock.json
+++ b/ui/package-lock.json
@@ -17,6 +17,7 @@
 				"pocketbase": "^0.26.8"
 			},
 			"devDependencies": {
+				"@sentry/vite-plugin": "^5.1.1",
 				"@sveltejs/adapter-auto": "^7.0.0",
 				"@sveltejs/adapter-node": "^5.5.4",
 				"@sveltejs/kit": "^2.50.2",
diff --git a/ui/package.json b/ui/package.json
index 5a684b8..3dce99a 100644
--- a/ui/package.json
+++ b/ui/package.json
@@ -12,6 +12,7 @@
 		"check:watch": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json --watch"
 	},
 	"devDependencies": {
+		"@sentry/vite-plugin": "^5.1.1",
 		"@sveltejs/adapter-auto": "^7.0.0",
 		"@sveltejs/adapter-node": "^5.5.4",
 		"@sveltejs/kit": "^2.50.2",
diff --git a/ui/src/hooks.client.ts b/ui/src/hooks.client.ts
index 00e3ff2..dd9d965 100644
--- a/ui/src/hooks.client.ts
+++ b/ui/src/hooks.client.ts
@@ -6,7 +6,10 @@ import { env } from '$env/dynamic/public';
 if (env.PUBLIC_GLITCHTIP_DSN) {
 	Sentry.init({
 		dsn: env.PUBLIC_GLITCHTIP_DSN,
-		tracesSampleRate: 0.1
+		tracesSampleRate: 0.1,
+		// Must match the release name used when uploading source maps in CI
+		// (BUILD_VERSION injected by Dockerfile as PUBLIC_BUILD_VERSION).
+		release: env.PUBLIC_BUILD_VERSION || undefined
 	});
 }
 
diff --git a/ui/src/hooks.server.ts b/ui/src/hooks.server.ts
index 805bc73..0abdb36 100644
--- a/ui/src/hooks.server.ts
+++ b/ui/src/hooks.server.ts
@@ -13,7 +13,10 @@ import { drain as drainPresignCache } from '$lib/server/presignCache';
 if (pubEnv.PUBLIC_GLITCHTIP_DSN) {
 	Sentry.init({
 		dsn: pubEnv.PUBLIC_GLITCHTIP_DSN,
-		tracesSampleRate: 0.1
+		tracesSampleRate: 0.1,
+		// Must match the release name used when uploading source maps in CI
+		// (BUILD_VERSION injected by Dockerfile as PUBLIC_BUILD_VERSION).
+		release: pubEnv.PUBLIC_BUILD_VERSION || undefined
 	});
 }
 
diff --git a/ui/vite.config.ts b/ui/vite.config.ts
index bb50a3d..1ade991 100644
--- a/ui/vite.config.ts
+++ b/ui/vite.config.ts
@@ -1,9 +1,36 @@
 import { sveltekit } from '@sveltejs/kit/vite';
 import tailwindcss from '@tailwindcss/vite';
 import { defineConfig } from 'vite';
+import { sentryVitePlugin } from '@sentry/vite-plugin';
 
+// Source maps are always generated so that the CI pipeline can upload them to
+// GlitchTip after a release build. The sentryVitePlugin upload step is only
+// active when SENTRY_AUTH_TOKEN is present (i.e. in the release CI job).
 export default defineConfig({
-	plugins: [tailwindcss(), sveltekit()],
+	build: {
+		sourcemap: true
+	},
+	plugins: [
+		tailwindcss(),
+		sveltekit(),
+		sentryVitePlugin({
+			org: 'libnovel',
+			project: 'libnovel-ui',
+			url: 'https://errors.libnovel.cc/',
+			// Auth token injected by CI via SENTRY_AUTH_TOKEN env var.
+			// When the env var is absent the plugin is a no-op.
+			authToken: process.env.SENTRY_AUTH_TOKEN,
+			// Release name matches the Docker image tag (e.g. "1.2.3").
+			release: { name: process.env.BUILD_VERSION },
+			// Don't upload source maps in local dev or CI type-check jobs.
+			disable: !process.env.SENTRY_AUTH_TOKEN,
+			// Source maps are uploaded to GlitchTip; do not ship them in the
+			// production bundle served to browsers.
+			sourceMapsUploadOptions: {
+				filesToDeleteAfterUpload: ['./build/**/*.map']
+			}
+		})
+	],
 	ssr: {
 		// Force these packages to be bundled into the server output rather than
 		// treated as external requires. The production Docker image has no