diff --git a/flake.lock b/flake.lock
index 93e27cd..c6923ac 100644
--- a/flake.lock
+++ b/flake.lock
@@ -43,11 +43,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1724316499,
-        "narHash": "sha256-Qb9MhKBUTCfWg/wqqaxt89Xfi6qTD3XpTzQ9eXi3JmE=",
+        "lastModified": 1726062281,
+        "narHash": "sha256-PyFVySdGj3enKqm8RQuo4v1KLJLmNLOq2yYOHsI6e2Q=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "797f7dc49e0bc7fab4b57c021cdf68f595e47841",
+        "rev": "e65aa8301ba4f0ab8cb98f944c14aa9da07394f8",
         "type": "github"
       },
       "original": {
@@ -59,11 +59,11 @@
     },
     "nixpkgs-unstable": {
       "locked": {
-        "lastModified": 1724395761,
-        "narHash": "sha256-zRkDV/nbrnp3Y8oCADf5ETl1sDrdmAW6/bBVJ8EbIdQ=",
+        "lastModified": 1726206720,
+        "narHash": "sha256-tI7141IHDABMNgz4iXDo8agCp0SeTLbaIZ2DRndwcmk=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "ae815cee91b417be55d43781eb4b73ae1ecc396c",
+        "rev": "673d99f1406cb09b8eb6feab4743ebdf70046557",
         "type": "github"
       },
       "original": {
diff --git a/pkgs/pinned.nix b/pkgs/pinned.nix
index aad30b4..9d99616 100644
--- a/pkgs/pinned.nix
+++ b/pkgs/pinned.nix
@@ -4,22 +4,22 @@ pkgs: pkgsUnstable:
   inherit (pkgs)
     bitcoin
     bitcoind
-    btcpayserver
     charge-lnd
-    clightning
     electrs
     elementsd
     extra-container
     hwi
     lightning-loop
     lightning-pool
-    lndconnect
-    nbxplorer;
+    lndconnect;
 
   inherit (pkgsUnstable)
+    btcpayserver
     clboss
+    clightning
     fulcrum
-    lnd;
+    lnd
+    nbxplorer;
 
   inherit pkgs pkgsUnstable;
 }
diff --git a/pkgs/python-packages/default.nix b/pkgs/python-packages/default.nix
index 356e8e2..af056d5 100644
--- a/pkgs/python-packages/default.nix
+++ b/pkgs/python-packages/default.nix
@@ -6,7 +6,6 @@ rec {
   in
     {
       txzmq = callPackage ./txzmq {};
-
       pyln-client = clightningPkg ./pyln-client;
       pyln-proto = clightningPkg ./pyln-proto;
       pyln-bolt7 = clightningPkg ./pyln-bolt7;
@@ -25,6 +24,10 @@ rec {
 
       # autobahn 20.12.3, required by joinmarketclient
       autobahn = callPackage ./specific-versions/autobahn.nix {};
+      # coincurve 20, required by pyln-proto.
+      coincurve = callPackage ./specific-versions/coincurve_20 {};
+      # scikit-build-core 0_10, required by coincurve.
+      scikit-build-core = callPackage ./specific-versions/scikit-build-core_0_10 {};
     };
 
   nbPython3Packages = (python3.override {
diff --git a/pkgs/python-packages/pyln-proto/default.nix b/pkgs/python-packages/pyln-proto/default.nix
index 32bc248..cde5e44 100644
--- a/pkgs/python-packages/pyln-proto/default.nix
+++ b/pkgs/python-packages/pyln-proto/default.nix
@@ -29,10 +29,4 @@ buildPythonPackage rec {
   checkInputs = [ pytestCheckHook ];
 
   postUnpack = "sourceRoot=$sourceRoot/contrib/pyln-proto";
-
-  postPatch = ''
-    substituteInPlace pyproject.toml \
-      --replace-fail 'coincurve = "^18"' 'coincurve = "^19"' \
-      --replace-fail 'cryptography = "^41"' 'cryptography = "^42"' \
-  '';
 }
diff --git a/pkgs/python-packages/specific-versions/coincurve_20/default.nix b/pkgs/python-packages/specific-versions/coincurve_20/default.nix
new file mode 100644
index 0000000..afa9d41
--- /dev/null
+++ b/pkgs/python-packages/specific-versions/coincurve_20/default.nix
@@ -0,0 +1,87 @@
+# Copied from nixpkgs revision 673d99f1406cb09b8eb6feab4743ebdf70046557
+{
+  lib,
+  buildPythonPackage,
+  fetchFromGitHub,
+
+  # build-system
+  cmake,
+  hatchling,
+  ninja,
+  pkg-config,
+  setuptools,
+  scikit-build-core,
+
+  # dependencies
+  asn1crypto,
+  cffi,
+  secp256k1,
+
+  # checks
+  pytestCheckHook,
+  pythonOlder,
+}:
+
+buildPythonPackage rec {
+  pname = "coincurve";
+  version = "20.0.0";
+  pyproject = true;
+
+  disabled = pythonOlder "3.7";
+
+  src = fetchFromGitHub {
+    owner = "ofek";
+    repo = "coincurve";
+    rev = "refs/tags/v${version}";
+    hash = "sha256-NKx/iLuzFEu1UBuwa14x55Ab3laVAKEtX6dtoWi0dOg=";
+  };
+
+  postPatch = ''
+    # don't try to load .dll files
+    cp -r --no-preserve=mode ${secp256k1.src} libsecp256k1
+    patchShebangs secp256k1/autogen.sh
+  '';
+
+  build-system = [
+    hatchling
+    cffi
+    cmake
+    ninja
+    pkg-config
+    setuptools
+    scikit-build-core
+  ];
+
+  dontUseCmakeConfigure = true;
+
+  env.COINCURVE_IGNORE_SYSTEM_LIB = "OFF";
+
+  buildInputs = [ secp256k1 ];
+
+  dependencies = [
+    asn1crypto
+    cffi
+  ];
+
+  preCheck = ''
+    # https://github.com/ofek/coincurve/blob/master/tox.ini#L20-L22=
+    rm -rf coincurve
+
+    # don't run benchmark tests
+    rm tests/test_bench.py
+  '';
+
+  nativeCheckInputs = [ pytestCheckHook ];
+
+  pythonImportsCheck = [ "coincurve" ];
+
+  meta = with lib; {
+    description = "Cross-platform bindings for libsecp256k1";
+    homepage = "https://github.com/ofek/coincurve";
+    license = with licenses; [
+      asl20
+      mit
+    ];
+    maintainers = [ ];
+  };
+}
diff --git a/pkgs/python-packages/specific-versions/scikit-build-core_0_10/default.nix b/pkgs/python-packages/specific-versions/scikit-build-core_0_10/default.nix
new file mode 100644
index 0000000..587e4c6
--- /dev/null
+++ b/pkgs/python-packages/specific-versions/scikit-build-core_0_10/default.nix
@@ -0,0 +1,97 @@
+# Copied from nixpkgs revision 673d99f1406cb09b8eb6feab4743ebdf70046557
+{
+  lib,
+  buildPythonPackage,
+  fetchFromGitHub,
+  pythonOlder,
+
+  # build-system
+  hatch-vcs,
+  hatchling,
+  cmake,
+  ninja,
+
+  # dependencies
+  packaging,
+  pathspec,
+  exceptiongroup,
+
+  # tests
+  build,
+  cattrs,
+  numpy,
+  pybind11,
+  pytest-subprocess,
+  pytestCheckHook,
+  setuptools,
+  tomli,
+  virtualenv,
+  wheel,
+}:
+
+buildPythonPackage rec {
+  pname = "scikit-build-core";
+  version = "0.10.5";
+  pyproject = true;
+
+  src = fetchFromGitHub {
+    owner = "scikit-build";
+    repo = "scikit-build-core";
+    rev = "refs/tags/v${version}";
+    hash = "sha256-hpwXEWPofgMT4ua2tZI1mtGbaBkT2XPBd6QL8xTi1A0=";
+  };
+
+  postPatch = lib.optionalString (pythonOlder "3.11") ''
+    substituteInPlace pyproject.toml \
+      --replace-fail '"error",' '"error", "ignore::UserWarning",'
+  '';
+
+  build-system = [
+    hatch-vcs
+    hatchling
+  ];
+
+  dependencies =
+    [
+      packaging
+      pathspec
+    ]
+    ++ lib.optionals (pythonOlder "3.11") [
+      exceptiongroup
+      tomli
+    ];
+
+  nativeCheckInputs = [
+    build
+    cattrs
+    cmake
+    ninja
+    numpy
+    pybind11
+    pytest-subprocess
+    pytestCheckHook
+    setuptools
+    virtualenv
+    wheel
+  ];
+
+  # cmake is only used for tests
+  dontUseCmakeConfigure = true;
+
+  pytestFlagsArray = [ "-m 'not isolated and not network'" ];
+
+  disabledTestPaths = [
+    # store permissions issue in Nix:
+    "tests/test_editable.py"
+  ];
+
+  pythonImportsCheck = [ "scikit_build_core" ];
+
+  meta = with lib; {
+    description = "Next generation Python CMake adaptor and Python API for plugins";
+    homepage = "https://github.com/scikit-build/scikit-build-core";
+    changelog = "https://github.com/scikit-build/scikit-build-core/releases/tag/v${version}";
+    license = with licenses; [ asl20 ];
+    maintainers = with maintainers; [ veprbl ];
+  };
+}
diff --git a/test/nixos-search/flake.lock b/test/nixos-search/flake.lock
index 7d7cf64..0e02af7 100644
--- a/test/nixos-search/flake.lock
+++ b/test/nixos-search/flake.lock
@@ -21,11 +21,11 @@
     "nixos-infra": {
       "flake": false,
       "locked": {
-        "lastModified": 1722643042,
-        "narHash": "sha256-bW2O/ZKSs2k2pf7r6IHMi7RKHL0JVhiKV9WfyrMO8CQ=",
+        "lastModified": 1725609162,
+        "narHash": "sha256-5DqMqrei9SIkmiibU2yYaeZ/uzMFguUjAa3hxIp6l3s=",
         "owner": "NixOS",
         "repo": "infra",
-        "rev": "66da5cfddb8c67b5e2f0b5bba62899f1f82eec42",
+        "rev": "a7802cab46dae02a8e7e942cfbca41d46220da74",
         "type": "github"
       },
       "original": {
@@ -43,11 +43,11 @@
         "npmlock2nix": "npmlock2nix"
       },
       "locked": {
-        "lastModified": 1723413203,
-        "narHash": "sha256-IbtEvGqCHY2UdP6EqD4Bc7jCrpqva1DVRUgggTTowYg=",
+        "lastModified": 1725982115,
+        "narHash": "sha256-bTwyWn0do8RCzZZOSdXhBDBE/TECEfKFglTM6mYHSo4=",
         "owner": "nixos",
         "repo": "nixos-search",
-        "rev": "0e318111ee9d44fc40552d5aa95a6fd4026401c5",
+        "rev": "d56ef06c2e9f2b28916592979c96e917ebe5db14",
         "type": "github"
       },
       "original": {
@@ -58,11 +58,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1723175592,
-        "narHash": "sha256-M0xJ3FbDUc4fRZ84dPGx5VvgFsOzds77KiBMW/mMTnI=",
+        "lastModified": 1725634671,
+        "narHash": "sha256-v3rIhsJBOMLR8e/RNWxr828tB+WywYIoajrZKFM+0Gg=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "5e0ca22929f3342b19569b21b2f3462f053e497b",
+        "rev": "574d1eac1c200690e27b8eb4e24887f8df7ac27c",
         "type": "github"
       },
       "original": {