diff --git a/nix/onixPackages/default.nix b/nix/onixPackages/default.nix
index 13c68a8..e61792c 100644
--- a/nix/onixPackages/default.nix
+++ b/nix/onixPackages/default.nix
@@ -14,15 +14,4 @@ ocamlPackages.overrideScope (self: super: {
     doCheck = false;
   });
   logs = super.logs.override { jsooSupport = false; };
-  opam-core = super.opam-core.overrideAttrs (attrs: {
-    propagatedBuildInputs = attrs.propagatedBuildInputs ++ [
-      ocamlPackages.uutf
-      ocamlPackages.jsonm
-      ocamlPackages.sha
-      self.swhid_core
-      self.spdx_licenses
-    ];
-  });
-  swhid_core = self.callPackage ./swhid_core.nix {};
-  spdx_licenses = self.callPackage ./spdx_licenses.nix {};
 })
diff --git a/nix/onixPackages/spdx_licenses.nix b/nix/onixPackages/spdx_licenses.nix
deleted file mode 100644
index dc1dd08..0000000
--- a/nix/onixPackages/spdx_licenses.nix
+++ /dev/null
@@ -1,20 +0,0 @@
-{ lib, fetchurl, buildDunePackage }:
-
-buildDunePackage rec {
-  pname = "spdx_licenses";
-  version = "1.2.0";
-  useDune2 = true;
-
-  src = fetchurl {
-    url =
-      "https://github.com/kit-ty-kate/spdx_licenses/releases/download/v1.2.0/spdx_licenses-1.2.0.tar.gz";
-    sha256 = "sha256-9ViB7PRDz70w3RJczapgn2tJx9wTWgAbdzos6r3J2r4=";
-  };
-
-  meta = with lib; {
-    description = "spdx_licenses";
-    homepage = "https://github.com/kit-ty-kate/spdx_licenses";
-    license = licenses.mit;
-    maintainers = [ ];
-  };
-}
diff --git a/nix/onixPackages/swhid_core.nix b/nix/onixPackages/swhid_core.nix
deleted file mode 100644
index 678eb60..0000000
--- a/nix/onixPackages/swhid_core.nix
+++ /dev/null
@@ -1,20 +0,0 @@
-{ lib, fetchurl, buildDunePackage }:
-
-buildDunePackage rec {
-  pname = "swhid_core";
-  version = "0.1";
-  useDune2 = true;
-
-  src = fetchurl {
-    url =
-      "https://github.com/OCamlPro/swhid_core/archive/refs/tags/0.1.tar.gz";
-    sha256 = "sha256-hxi065fJ8KzW2RYqnvovavgkdKC9GG9iL9oylPdzvM8=";
-  };
-
-  meta = with lib; {
-    description = "swhid_core";
-    homepage = "https://github.com/OCamlPro/swhid_core";
-    license = licenses.isc;
-    maintainers = [ ];
-  };
-}