diff --git a/git-kv.opam b/git-kv.opam
index 9a18edc..78a1460 100644
--- a/git-kv.opam
+++ b/git-kv.opam
@@ -14,7 +14,7 @@ depends: [
   "mirage-kv"         {>= "6.0.0"}
   "carton"            {>= "0.6.0"}
   "fmt"               {>= "0.8.7"}
-  "mirage-clock"
+  "mirage-clock"      {>= "2.0.0"}
   "ptime"
   "hxd"               {with-test}
   "conf-git"          {with-test}