diff --git a/dune-project b/dune-project
index 370ef50a..d03fd93a 100644
--- a/dune-project
+++ b/dune-project
@@ -36,6 +36,6 @@
   (depends
     (tiny_httpd (= :version))
     (camlzip (>= 1.06))
-    iostream-camlzip
+    (iostream-camlzip (>= 0.2.1))
     (logs :with-test)
     (odoc :with-doc)))
diff --git a/tiny_httpd_camlzip.opam b/tiny_httpd_camlzip.opam
index e28dde38..469935b2 100644
--- a/tiny_httpd_camlzip.opam
+++ b/tiny_httpd_camlzip.opam
@@ -11,7 +11,7 @@ depends: [
   "dune" {>= "2.9"}
   "tiny_httpd" {= version}
   "camlzip" {>= "1.06"}
-  "iostream-camlzip"
+  "iostream-camlzip" {>= "0.2.1"}
   "logs" {with-test}
   "odoc" {with-doc}
 ]