diff --git a/pkgs/development/ocaml-modules/lwt/ppx.nix b/pkgs/development/ocaml-modules/lwt/ppx.nix
new file mode 100644
index 000000000000..3cf08d06f1eb
--- /dev/null
+++ b/pkgs/development/ocaml-modules/lwt/ppx.nix
@@ -0,0 +1,19 @@
+{ stdenv, jbuilder, ocaml, findlib, lwt, ppx_tools_versioned }:
+
+stdenv.mkDerivation {
+  name = "ocaml${ocaml.version}-lwt_ppx-${lwt.version}";
+
+  inherit (lwt) src;
+
+  buildInputs = [ jbuilder ocaml findlib ppx_tools_versioned ];
+
+  propagatedBuildInputs = [ lwt ];
+
+  buildPhase = "jbuilder build -p lwt_ppx";
+  installPhase = "${jbuilder.installPhase} lwt_ppx.install";
+
+  meta = {
+    description = "Ppx syntax extension for Lwt";
+    inherit (lwt.meta) license platforms homepage maintainers;
+  };
+}
diff --git a/pkgs/development/tools/analysis/flow/default.nix b/pkgs/development/tools/analysis/flow/default.nix
index 4a2d298495da..dbe19935d62e 100644
--- a/pkgs/development/tools/analysis/flow/default.nix
+++ b/pkgs/development/tools/analysis/flow/default.nix
@@ -1,17 +1,17 @@
 { stdenv, fetchFromGitHub, lib, ocaml, libelf, cf-private, CoreServices,
-  findlib, camlp4, sedlex, ocamlbuild, ocaml_lwt, wtf8, dtoa }:
+  findlib, camlp4, sedlex, ocamlbuild, lwt_ppx, wtf8, dtoa }:
 
 with lib;
 
 stdenv.mkDerivation rec {
-  version = "0.66.0";
+  version = "0.68.0";
   name = "flow-${version}";
 
   src = fetchFromGitHub {
     owner = "facebook";
     repo = "flow";
     rev = "v${version}";
-    sha256 = "0l1sdd1n0llmz8m81vym3zhcn824sr9w46h9jpb7i7wrcm4y410d";
+    sha256 = "0wags0msk7s1z3gi6ns6d7zdpqk8wh5ryafvdyk6zwqwhaqgr5jw";
   };
 
   installPhase = ''
@@ -20,7 +20,7 @@ stdenv.mkDerivation rec {
   '';
 
   buildInputs = [
-    ocaml libelf findlib camlp4 sedlex ocamlbuild ocaml_lwt wtf8 dtoa
+    ocaml libelf findlib camlp4 sedlex ocamlbuild lwt_ppx wtf8 dtoa
   ] ++ optionals stdenv.isDarwin [ cf-private CoreServices ];
 
   meta = with stdenv.lib; {
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index be6957c7a572..8e7bf14f224a 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -7780,7 +7780,7 @@ with pkgs;
   flow = callPackage ../development/tools/analysis/flow {
     inherit (darwin.apple_sdk.frameworks) CoreServices;
     inherit (darwin) cf-private;
-    inherit (ocamlPackages) ocaml findlib camlp4 sedlex ocamlbuild ocaml_lwt
+    inherit (ocamlPackages) ocaml findlib camlp4 sedlex ocamlbuild lwt_ppx
       wtf8 dtoa;
   };
 
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index 5c2ec39ade7a..7ac8508d889b 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -374,6 +374,10 @@ let
 
     ocaml_lwt = if lib.versionOlder "4.02" ocaml.version then lwt3 else lwt2;
 
+    lwt_ppx = callPackage ../development/ocaml-modules/lwt/ppx.nix {
+      lwt = lwt3;
+    };
+
     lwt_react = callPackage ../development/ocaml-modules/lwt_react {
       lwt = lwt3;
     };