diff --git a/dream.opam b/dream.opam
index fc9c0c12..d62d7fd2 100644
--- a/dream.opam
+++ b/dream.opam
@@ -69,9 +69,8 @@ depends: [
   "magic-mime"
   "markup" {>= "1.0.2"}
   "mirage-clock" {>= "3.0.0"}  # now_d_ps : unit -> int * int64.
-  "mirage-crypto" {>= "1.0.0"}
-  "mirage-crypto-rng" {>= "1.0.0"}
-  "mirage-crypto-rng-lwt"
+  "mirage-crypto" {>= "1.2.0"}
+  "mirage-crypto-rng" {>= "1.2.0"}
   "multipart_form" {>= "0.4.0"}
   "multipart_form-lwt"
   "ocaml" {>= "4.08.0"}
diff --git a/src/dream.ml b/src/dream.ml
index 07b9248a..06d0130b 100644
--- a/src/dream.ml
+++ b/src/dream.ml
@@ -56,7 +56,7 @@ let now () =
 
 let () =
   Random.initialize (fun () ->
-    Mirage_crypto_rng_lwt.initialize (module Mirage_crypto_rng.Fortuna))
+    Mirage_crypto_rng_unix.use_default ())
 
 module Session =
 struct
diff --git a/src/dune b/src/dune
index a82c981c..e40646fc 100644
--- a/src/dune
+++ b/src/dune
@@ -16,6 +16,6 @@
   logs
   lwt
   lwt.unix
-  mirage-crypto-rng-lwt
+  mirage-crypto-rng.unix
   ptime.clock.os
  ))