diff --git a/builder-web.opam b/builder-web.opam
index 9b8e049..fcd61d9 100644
--- a/builder-web.opam
+++ b/builder-web.opam
@@ -22,6 +22,7 @@ depends: [
   "cstruct" {>= "6.0.0"}
   "bos"
   "hex"
+  "lwt" {>= "5.3.0"}
   "caqti"
   "caqti-lwt"
   "caqti-driver-sqlite3"