diff --git a/pkgs/development/ocaml-modules/lru/default.nix b/pkgs/development/ocaml-modules/lru/default.nix
index 678023bb8f3d..2c8a3e99df57 100644
--- a/pkgs/development/ocaml-modules/lru/default.nix
+++ b/pkgs/development/ocaml-modules/lru/default.nix
@@ -4,6 +4,8 @@ buildDunePackage rec {
   pname = "lru";
   version = "0.3.1";
 
+  duneVersion = "3";
+
   src = fetchurl {
     url = "https://github.com/pqwy/lru/releases/download/v${version}/lru-${version}.tbz";
     hash = "sha256-bL4j0np9WyRPhpwLiBQNR/cPQTpkYu81wACTJdSyNv0=";
diff --git a/pkgs/development/ocaml-modules/psq/default.nix b/pkgs/development/ocaml-modules/psq/default.nix
index ea9a0615b414..f1c8ab92af44 100644
--- a/pkgs/development/ocaml-modules/psq/default.nix
+++ b/pkgs/development/ocaml-modules/psq/default.nix
@@ -1,15 +1,15 @@
 { lib, buildDunePackage, ocaml, fetchurl, seq, qcheck-alcotest }:
 
 buildDunePackage rec {
-  minimumOCamlVersion = "4.03";
+  minimalOCamlVersion = "4.03";
   pname = "psq";
-  version = "0.2.0";
+  version = "0.2.1";
 
-  useDune2 = true;
+  duneVersion = "3";
 
   src = fetchurl {
-    url = "https://github.com/pqwy/psq/releases/download/v${version}/psq-v${version}.tbz";
-    sha256 = "1j4lqkq17rskhgcrpgr4n1m1a2b1x35mlxj6f9g05rhpmgvgvknk";
+    url = "https://github.com/pqwy/psq/releases/download/v${version}/psq-${version}.tbz";
+    hash = "sha256-QgBfUz6r50sXme4yuJBWVM1moivtSvK9Jmso2EYs00Q=";
   };
 
   propagatedBuildInputs = [ seq ];