diff --git a/conduit-lwt-unix.opam b/conduit-lwt-unix.opam
index d60cca77..5f177fa0 100644
--- a/conduit-lwt-unix.opam
+++ b/conduit-lwt-unix.opam
@@ -25,7 +25,7 @@ depends: [
 ]
 depopts: ["tls" "lwt_ssl" "launchd"]
 conflicts: [
-  "tls" {< "0.11.0"}
+  "tls" {< "0.13.0"}
   "ssl" {< "0.5.9"}
 ]
 build: [
@@ -34,3 +34,7 @@ build: [
 ]
 dev-repo: "git+https://github.com/mirage/ocaml-conduit.git"
 synopsis: "A network connection establishment library for Lwt_unix"
+pin-depends: [
+  [ "tls.0.13.0" "git+https://github.com/mirleft/ocaml-tls.git#f9dd61f556d3f2790aa9eedcf2b6b3c8c99cb338" ]
+  [ "tls-mirage.0.13.0" "git+https://github.com/mirleft/ocaml-tls.git#f9dd61f556d3f2790aa9eedcf2b6b3c8c99cb338" ]
+]
diff --git a/conduit-mirage.opam b/conduit-mirage.opam
index da598a9a..41cf1a32 100644
--- a/conduit-mirage.opam
+++ b/conduit-mirage.opam
@@ -40,3 +40,7 @@ build: [
 ]
 dev-repo: "git+https://github.com/mirage/ocaml-conduit.git"
 synopsis: "A network connection establishment library for MirageOS"
+pin-depends: [
+  [ "tls.0.13.0" "git+https://github.com/mirleft/ocaml-tls.git#f9dd61f556d3f2790aa9eedcf2b6b3c8c99cb338" ]
+  [ "tls-mirage.0.13.0" "git+https://github.com/mirleft/ocaml-tls.git#f9dd61f556d3f2790aa9eedcf2b6b3c8c99cb338" ]
+]
diff --git a/src/conduit-lwt-unix/conduit_lwt_tls.real.mli b/src/conduit-lwt-unix/conduit_lwt_tls.real.mli
index e29cc8b2..099ff520 100644
--- a/src/conduit-lwt-unix/conduit_lwt_tls.real.mli
+++ b/src/conduit-lwt-unix/conduit_lwt_tls.real.mli
@@ -18,7 +18,7 @@
 (** TLS/SSL connections via OCaml-TLS *)
 
 module X509 : sig
-  val private_of_pems : cert:string -> priv_key:string -> X509_lwt.priv Lwt.t
+  val private_of_pems : cert:string -> priv_key:string -> Tls.Config.certchain Lwt.t
 
   type authenticator = X509.Authenticator.t