diff --git a/nix/pkgs.nix b/nix/pkgs.nix
index 8626523577646a6e5dc34237700cfa2a2ab4dde4..8f08f15e2ed2c3ad9c9f176c69dd830e48dae2a3 100644
--- a/nix/pkgs.nix
+++ b/nix/pkgs.nix
@@ -7,7 +7,6 @@ let
     headache = oself.callPackage ./headache.nix {};
     mlmpfr = oself.callPackage ./mlmpfr.nix {};
     why3 = oself.callPackage ./why3.nix {};
-    yaml = oself.callPackage ./yaml.nix {};
     ppx_deriving_yaml = oself.callPackage ./ppx_deriving_yaml.nix {};
 
     # Helpers
diff --git a/nix/ppx_deriving_yaml.nix b/nix/ppx_deriving_yaml.nix
index 44b6e980ae69201b348aad19bba59a2b4b905e85..4b1e177f30bea44777844c0b7cd2bce8ede92056 100644
--- a/nix/ppx_deriving_yaml.nix
+++ b/nix/ppx_deriving_yaml.nix
@@ -1,12 +1,11 @@
-{ lib, buildDunePackage, fetchurl, ppxlib, alcotest, mdx
-, ppx_deriving, yaml
-}:
+{ lib, buildDunePackage, fetchurl, ppxlib, alcotest, ppx_deriving, yaml }:
 
 buildDunePackage rec {
   pname = "ppx_deriving_yaml";
   version = "0.2.1";
 
   minimalOCamlVersion = "4.08";
+  duneVersion = "3";
 
   src = fetchurl {
     url = "https://github.com/patricoferris/ppx_deriving_yaml/releases/download/v${version}/ppx_deriving_yaml-${version}.tbz";
@@ -15,9 +14,6 @@ buildDunePackage rec {
 
   propagatedBuildInputs = [ ppxlib ppx_deriving yaml ];
 
-  doCheck = true;
-  checkInputs = [ alcotest mdx ];
-
   meta = {
     description = "A YAML codec generator for OCaml";
     homepage = "https://github.com/patricoferris/ppx_deriving_yaml";
diff --git a/nix/sources.json b/nix/sources.json
index 52d18208892086ed9f4900f4291307d4e9d6f9b8..f3366def7224ddf86cc72dba0203100ae2053299 100644
--- a/nix/sources.json
+++ b/nix/sources.json
@@ -29,10 +29,10 @@
         "homepage": "https://github.com/NixOS/nixpkgs",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "d231d18e4aa5e1d00f86b4f484f9e4344538e3ea",
-        "sha256": "1ks9h2m6ns6b0wbw6x4cqaqwgfac1n51v3a8vygnm7ynq34ka2l1",
+        "rev": "f292b4964cb71f9dfbbd30dc9f511d6165cd109b",
+        "sha256": "01yzrkrb60dd2y2y3fh4939z374hf5pa92q8axfcygqlnbk3jpb4",
         "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs/archive/d231d18e4aa5e1d00f86b4f484f9e4344538e3ea.tar.gz",
+        "url": "https://github.com/NixOS/nixpkgs/archive/f292b4964cb71f9dfbbd30dc9f511d6165cd109b.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "why3": {
diff --git a/nix/yaml.nix b/nix/yaml.nix
deleted file mode 100644
index bc8c7af164efc3768c615212b47da43ef5c8cfd5..0000000000000000000000000000000000000000
--- a/nix/yaml.nix
+++ /dev/null
@@ -1,32 +0,0 @@
-{ lib, fetchurl, buildDunePackage
-, dune-configurator
-, bos, ctypes, fmt, logs
-, mdx, alcotest, crowbar, junit_alcotest, ezjsonm
-}:
-
-buildDunePackage rec {
-  pname = "yaml";
-  version = "3.0.1";
-
-  src = fetchurl {
-    url = "https://github.com/avsm/ocaml-yaml/releases/download/v${version}/yaml-${version}.tbz";
-    sha256 = "ku0bpClVmhS2tF4XDzSCGReR+ZrFGJpfIGEuFb+99pU=";
-  };
-
-  minimalOCamlVersion = "4.05.0";
-
-  buildInputs = [ dune-configurator ];
-  propagatedBuildInputs = [ bos ctypes ];
-
-  doCheck = true;
-  nativeCheckInputs = [ mdx.bin ];
-  checkInputs = [ fmt logs alcotest crowbar junit_alcotest ezjsonm ];
-
-  meta = {
-    description = "Parse and generate YAML 1.1 files";
-    homepage = "https://github.com/avsm/ocaml-yaml";
-    license = lib.licenses.isc;
-    maintainers = [ lib.maintainers.vbgl ];
-  };
-
-}