diff --git a/pkgs/development/ocaml-modules/conduit/async.nix b/pkgs/development/ocaml-modules/conduit/async.nix
index 249635d14bb8..5aaf16c46de5 100644
--- a/pkgs/development/ocaml-modules/conduit/async.nix
+++ b/pkgs/development/ocaml-modules/conduit/async.nix
@@ -9,8 +9,6 @@ buildDunePackage {
     src
     ;
 
-  duneVersion = "3";
-
   buildInputs = [ ppx_sexp_conv ppx_here ];
 
   propagatedBuildInputs = [
diff --git a/pkgs/development/ocaml-modules/conduit/default.nix b/pkgs/development/ocaml-modules/conduit/default.nix
index ada502aaf0cb..7a7ee238f10b 100644
--- a/pkgs/development/ocaml-modules/conduit/default.nix
+++ b/pkgs/development/ocaml-modules/conduit/default.nix
@@ -5,14 +5,13 @@
 
 buildDunePackage rec {
   pname = "conduit";
-  version = "6.2.0";
+  version = "6.2.1";
 
   minimalOCamlVersion = "4.08";
-  duneVersion = "3";
 
   src = fetchurl {
     url = "https://github.com/mirage/ocaml-conduit/releases/download/v${version}/conduit-${version}.tbz";
-    sha256 = "sha256-PtRAsO3aGyEt12K9skgx85TcoFmF3RtKxPlFgdFFI5Q=";
+    hash = "sha256-WdXntiQ3vkibC3nOEf+QrATvOcaD5M78qFh6/cL1W7s=";
   };
 
   propagatedBuildInputs = [ astring ipaddr ipaddr-sexp sexplib uri ppx_sexp_conv ];
diff --git a/pkgs/development/ocaml-modules/conduit/lwt-unix.nix b/pkgs/development/ocaml-modules/conduit/lwt-unix.nix
index cb86ea5f4f06..81a77f356aff 100644
--- a/pkgs/development/ocaml-modules/conduit/lwt-unix.nix
+++ b/pkgs/development/ocaml-modules/conduit/lwt-unix.nix
@@ -6,7 +6,6 @@
 buildDunePackage {
   pname = "conduit-lwt-unix";
   inherit (conduit-lwt) version src;
-  duneVersion = "3";
 
   buildInputs = [ ppx_sexp_conv ];
 
diff --git a/pkgs/development/ocaml-modules/conduit/lwt.nix b/pkgs/development/ocaml-modules/conduit/lwt.nix
index 2ec6f556916d..641d57db10e3 100644
--- a/pkgs/development/ocaml-modules/conduit/lwt.nix
+++ b/pkgs/development/ocaml-modules/conduit/lwt.nix
@@ -3,7 +3,6 @@
 buildDunePackage {
   pname = "conduit-lwt";
   inherit (conduit) version src;
-  duneVersion = "3";
 
   buildInputs = [ ppx_sexp_conv ];
 
diff --git a/pkgs/development/ocaml-modules/conduit/mirage.nix b/pkgs/development/ocaml-modules/conduit/mirage.nix
index 04025666c3d9..79174261b9eb 100644
--- a/pkgs/development/ocaml-modules/conduit/mirage.nix
+++ b/pkgs/development/ocaml-modules/conduit/mirage.nix
@@ -1,5 +1,4 @@
 { buildDunePackage, conduit-lwt
-, fetchpatch
 , ppx_sexp_conv, sexplib, uri, cstruct, mirage-flow
 , mirage-flow-combinators, mirage-random, mirage-time, mirage-clock
 , dns-client-mirage, vchan, xenstore, tls, tls-mirage, ipaddr, ipaddr-sexp
@@ -11,12 +10,6 @@ buildDunePackage {
 
   inherit (conduit-lwt) version src;
 
-  # Compatibility with tls ≥ 0.17
-  patches = fetchpatch {
-    url = "https://github.com/mirage/ocaml-conduit/commit/403b4cec528dae71aded311215868a35c11dad7e.patch";
-    hash = "sha256-R/iuLf2PSrx8mLKLueMA3+zr9sB8dX/3evjUbfQECBk=";
-  };
-
   nativeBuildInputs = [ ppx_sexp_conv ];
 
   propagatedBuildInputs = [