diff --git a/angstrom-async.opam b/angstrom-async.opam
index 6a058fa..607e101 100644
--- a/angstrom-async.opam
+++ b/angstrom-async.opam
@@ -22,7 +22,7 @@ build: [
 depends: [
   "ocaml" {>= "4.04.1"}
   "dune" {>= "3.0"}
-  "angstrom" {>= "0.7.0"}
+  "angstrom" {= version}
   "async" {>= "v0.10.0"}
   "core_bench" {with-test}
   "core_unix" {with-test & >= "v0.15.0"}
diff --git a/angstrom-lwt-unix.opam b/angstrom-lwt-unix.opam
index 08b54a1..4f3f358 100644
--- a/angstrom-lwt-unix.opam
+++ b/angstrom-lwt-unix.opam
@@ -22,7 +22,7 @@ build: [
 depends: [
   "ocaml" {>= "4.03.0"}
   "dune" {>= "3.0"}
-  "angstrom"
+  "angstrom" {= version}
   "lwt"
   "base-unix"
   "core_bench" {with-test}
diff --git a/angstrom-unix.opam b/angstrom-unix.opam
index f584e96..117c6de 100644
--- a/angstrom-unix.opam
+++ b/angstrom-unix.opam
@@ -22,7 +22,7 @@ build: [
 depends: [
   "ocaml" {>= "4.03.0"}
   "dune" {>= "3.0"}
-  "angstrom"
+  "angstrom" {= version}
   "base-unix"
 ]
 synopsis: "Unix support for Angstrom"