diff --git a/pkgs/development/ocaml-modules/lwt/default.nix b/pkgs/development/ocaml-modules/lwt/default.nix
index 754cbb3c5bff..065bb32e1f1f 100644
--- a/pkgs/development/ocaml-modules/lwt/default.nix
+++ b/pkgs/development/ocaml-modules/lwt/default.nix
@@ -7,7 +7,7 @@
   dune-configurator,
   ocplib-endian,
   ppxlib,
-  version ? if lib.versionAtLeast ppxlib.version "0.36" then "6.1.1" else "5.9.1",
+  version ? if lib.versionAtLeast ppxlib.version "0.36" then "6.1.2" else "5.9.1",
 }:
 
 buildDunePackage {
@@ -22,7 +22,7 @@ buildDunePackage {
       {
         "5.9.1" = "sha256-oPYLFugMTI3a+hmnwgUcoMgn5l88NP1Roq0agLhH/vI=";
         "5.9.2" = "sha256-pzowRN1wwaF2iMfMPE7RCtA2XjlaXC3xD0yznriVfu8=";
-        "6.1.1" = "sha256-EMlA+mh66bfVNqDcmuaW7GoEEu6xQhCRjZx7t7pHuGo=";
+        "6.1.2" = "sha256-9Uxo1ekB3VcvdR4FCVdVWzvPHuVwflYIdD/fWvg0/kc=";
       }
       ."${version}";
   };