diff --git a/dune-project b/dune-project
index cd123544..36a3d94e 100644
--- a/dune-project
+++ b/dune-project
@@ -25,8 +25,8 @@
   (thread-local-storage (and (>= 0.2) (< 0.3)))
   (odoc :with-doc)
   (hmap :with-test)
-  picos
-  picos_std
+  (picos (and (>= 0.5) (< 0.6)))
+  (picos_std (and (>= 0.5) (< 0.6)))
   (mdx
    (and
     (>= 1.9.0)
@@ -56,7 +56,7 @@
   (allow_empty)  ; on < 5.0
   (depends
     (moonpool (= :version))
-    picos_stdio
+    (picos_io (and (>= 0.5) (< 0.6)))
     (ocaml (>= 5.0))
     (trace :with-test)
     (trace-tef :with-test)
diff --git a/moonpool-io.opam b/moonpool-io.opam
index 97eefe0b..76a6ab82 100644
--- a/moonpool-io.opam
+++ b/moonpool-io.opam
@@ -10,7 +10,7 @@ bug-reports: "https://github.com/c-cube/moonpool/issues"
 depends: [
   "dune" {>= "3.0"}
   "moonpool" {= version}
-  "picos_stdio"
+  "picos_io" {>= "0.5" & < "0.6"}
   "ocaml" {>= "5.0"}
   "trace" {with-test}
   "trace-tef" {with-test}
diff --git a/moonpool.opam b/moonpool.opam
index 9ca18dad..f3c884ac 100644
--- a/moonpool.opam
+++ b/moonpool.opam
@@ -18,8 +18,8 @@ depends: [
   "thread-local-storage" {>= "0.2" & < "0.3"}
   "odoc" {with-doc}
   "hmap" {with-test}
-  "picos"
-  "picos_std"
+  "picos" {>= "0.5" & < "0.6"}
+  "picos_std" {>= "0.5" & < "0.6"}
   "mdx" {>= "1.9.0" & with-test}
 ]
 depopts: [
diff --git a/src/io/dune b/src/io/dune
index 8d290f98..8ba05ca5 100644
--- a/src/io/dune
+++ b/src/io/dune
@@ -4,4 +4,4 @@
  (synopsis "Async IO for moonpool, using Picos")
  (enabled_if
   (>= %{ocaml_version} 5.0))
- (libraries moonpool picos_stdio picos_stdio.select picos_stdio.fd))
+ (libraries moonpool picos_io picos_io.select picos_io.fd))
diff --git a/src/io/moonpool_io.ml b/src/io/moonpool_io.ml
index 198a9671..9b249347 100644
--- a/src/io/moonpool_io.ml
+++ b/src/io/moonpool_io.ml
@@ -1,6 +1,6 @@
-module Fd = Picos_stdio_fd
-module Unix = Picos_stdio.Unix
-module Select = Picos_stdio_select
+module Fd = Picos_io_fd
+module Unix = Picos_io.Unix
+module Select = Picos_io_select
 
 let fd_of_unix_fd : Unix.file_descr -> Fd.t = Fun.id
 let configure = Select.configure