diff --git a/deploy/wizwar.service b/deploy/wizwar.service
index 47c4792..1b4c0c3 100644
--- a/deploy/wizwar.service
+++ b/deploy/wizwar.service
@@ -11,6 +11,7 @@ Environment=PORT=8787
 Environment=HOST=127.0.0.1
 Environment=WIZWAR_DATA_DIR=/var/lib/wizwar/rooms
 Environment=WIZWAR_STATIC_DIR=/opt/wizwar/packages/web/dist
+Environment=SENTRY_DSN=https://a47ea012dff08b52dd230a95ccbe7414@o4509525984149504.ingest.us.sentry.io/4512011462049793
 ExecStart=/opt/wizwar/node_modules/.bin/tsx src/index.ts
 Restart=always
 RestartSec=3
diff --git a/packages/web/.env.production b/packages/web/.env.production
new file mode 100644
index 0000000..d292e3b
--- /dev/null
+++ b/packages/web/.env.production
@@ -0,0 +1,2 @@
+# Sentry browser DSN — public by design (it ships in every bundle).
+VITE_SENTRY_DSN=https://a47ea012dff08b52dd230a95ccbe7414@o4509525984149504.ingest.us.sentry.io/4512011462049793