diff --git a/builder-web.opam b/builder-web.opam
index 7b905fd..cadb7fc 100644
--- a/builder-web.opam
+++ b/builder-web.opam
@@ -17,7 +17,7 @@ build: [
 depends: [
   "ocaml" {>= "4.13.0"}
   "dune" {>= "2.7.0"}
-  "builder" {>= "0.2.0"}
+  "builder" {>= "0.4.0"}
   "dream" {>= "1.0.0~alpha7"}
   "bos"
   "ohex" {>= "0.2.0"}