diff --git a/dune-project b/dune-project
index 8407c455..0d0e8bae 100644
--- a/dune-project
+++ b/dune-project
@@ -142,6 +142,7 @@
   (cohttp-eio
    (>= 6.1.0))
   eio_main
+  tls-eio
   (alcotest :with-test)
   (containers :with-test))
  (synopsis "Collector client for opentelemetry, using cohttp + eio"))
diff --git a/opentelemetry-client-cohttp-eio.opam b/opentelemetry-client-cohttp-eio.opam
index ee7f47c6..ae142446 100644
--- a/opentelemetry-client-cohttp-eio.opam
+++ b/opentelemetry-client-cohttp-eio.opam
@@ -22,6 +22,7 @@ depends: [
   "odoc" {with-doc}
   "cohttp-eio" {>= "6.1.0"}
   "eio_main"
+  "tls-eio"
   "alcotest" {with-test}
   "containers" {with-test}
 ]