diff --git a/pkgs/development/ocaml-modules/faraday/async.nix b/pkgs/development/ocaml-modules/faraday/async.nix
index f24866a815c..18d1b76f043 100644
--- a/pkgs/development/ocaml-modules/faraday/async.nix
+++ b/pkgs/development/ocaml-modules/faraday/async.nix
@@ -5,6 +5,7 @@ buildDunePackage rec {
   inherit (faraday) version src;
 
   minimalOCamlVersion = "4.08";
+  duneVersion = "3";
 
   propagatedBuildInputs = [ faraday core_unix async ];
 
diff --git a/pkgs/development/ocaml-modules/faraday/default.nix b/pkgs/development/ocaml-modules/faraday/default.nix
index 0dcfd5ec02d..38ef4bb475a 100644
--- a/pkgs/development/ocaml-modules/faraday/default.nix
+++ b/pkgs/development/ocaml-modules/faraday/default.nix
@@ -5,6 +5,7 @@ buildDunePackage rec {
   version = "0.8.2";
 
   minimalOCamlVersion = "4.08";
+  duneVersion = "3";
 
   src = fetchFromGitHub {
     owner = "inhabitedtype";
diff --git a/pkgs/development/ocaml-modules/faraday/lwt-unix.nix b/pkgs/development/ocaml-modules/faraday/lwt-unix.nix
index a184011e913..1919de47169 100644
--- a/pkgs/development/ocaml-modules/faraday/lwt-unix.nix
+++ b/pkgs/development/ocaml-modules/faraday/lwt-unix.nix
@@ -3,6 +3,7 @@
 buildDunePackage rec {
   pname = "faraday-lwt-unix";
   inherit (faraday) version src;
+  duneVersion = "3";
 
   propagatedBuildInputs = [ lwt faraday-lwt ];
 
diff --git a/pkgs/development/ocaml-modules/faraday/lwt.nix b/pkgs/development/ocaml-modules/faraday/lwt.nix
index 2db306254f3..011074f2fba 100644
--- a/pkgs/development/ocaml-modules/faraday/lwt.nix
+++ b/pkgs/development/ocaml-modules/faraday/lwt.nix
@@ -5,6 +5,7 @@ buildDunePackage rec {
   inherit (faraday) version src;
 
   propagatedBuildInputs = [ faraday lwt ];
+  duneVersion = "3";
 
   meta = faraday.meta // {
     description = "Lwt support for Faraday";