diff --git a/angstrom-async.opam b/angstrom-async.opam
index 8dfa73c..33c8613 100644
--- a/angstrom-async.opam
+++ b/angstrom-async.opam
@@ -13,7 +13,7 @@ build: [
 depends: [
   "ocaml" {>= "4.04.1"}
   "dune" {>= "1.8"}
-  "angstrom" {>= "0.7.0"}
+  "angstrom" {>= "0.9.0"}
   "async" {>= "v0.10.0"}
 ]
 synopsis: "Async support for Angstrom"