diff --git a/http-mirage-client.opam b/http-mirage-client.opam
index 912afb0..ab8300a 100644
--- a/http-mirage-client.opam
+++ b/http-mirage-client.opam
@@ -18,9 +18,9 @@ depends: [
   "mimic-happy-eyeballs"
   "httpaf"
   "alcotest-lwt" {with-test}
-  "mirage-clock-unix" {with-test}
+  "mirage-clock-unix" {with-test & >= "4.0.0"}
   "mirage-crypto-rng" {with-test}
-  "mirage-time-unix" {with-test}
+  "mirage-time-unix" {with-test & >= "3.0.0"}
   "h2" {>= "0.10.0"}
 ]
 build: [