diff --git a/deployment/check/common/deployerNode.nix b/deployment/check/common/deployerNode.nix
index f8caba87..5802793c 100644
--- a/deployment/check/common/deployerNode.nix
+++ b/deployment/check/common/deployerNode.nix
@@ -54,11 +54,11 @@ in
 
     system.extraDependencies =
       [
-        inputs.flake-parts
-        inputs.flake-parts.inputs.nixpkgs-lib
         inputs.nixops4
         inputs.nixops4-nixos
         inputs.nixpkgs
+
+        sources.flake-parts
         sources.flake-inputs
 
         pkgs.stdenv
diff --git a/deployment/check/common/nixosTest.nix b/deployment/check/common/nixosTest.nix
index 3b43719a..d15203cb 100644
--- a/deployment/check/common/nixosTest.nix
+++ b/deployment/check/common/nixosTest.nix
@@ -138,7 +138,6 @@ in
         deployer.succeed("""
           nix flake lock --extra-experimental-features 'flakes nix-command' \
             --offline -v \
-            --override-input flake-parts ${inputs.flake-parts} \
             --override-input nixops4 ${inputs.nixops4.packages.${system}.flake-in-a-bottle} \
             \
             --override-input nixops4-nixos ${inputs.nixops4-nixos} \
@@ -151,7 +150,6 @@ in
             } \
             --override-input nixops4-nixos/git-hooks-nix ${emptyFlake} \
             \
-            --override-input nixpkgs ${inputs.nixpkgs} \
             --override-input git-hooks ${inputs.git-hooks} \
             ;
         """)
diff --git a/flake.lock b/flake.lock
index baf0a2bc..c98744f9 100644
--- a/flake.lock
+++ b/flake.lock
@@ -143,24 +143,6 @@
       }
     },
     "flake-parts_3": {
-      "inputs": {
-        "nixpkgs-lib": "nixpkgs-lib_3"
-      },
-      "locked": {
-        "lastModified": 1738453229,
-        "narHash": "sha256-7H9XgNiGLKN1G1CgRh0vUL4AheZSYzPm+zmZ7vxbJdo=",
-        "owner": "hercules-ci",
-        "repo": "flake-parts",
-        "rev": "32ea77a06711b758da0ad9bd6a844c5740a87abd",
-        "type": "github"
-      },
-      "original": {
-        "owner": "hercules-ci",
-        "repo": "flake-parts",
-        "type": "github"
-      }
-    },
-    "flake-parts_4": {
       "inputs": {
         "nixpkgs-lib": [
           "nixops4-nixos",
@@ -342,7 +324,7 @@
     "nix": {
       "inputs": {
         "flake-compat": "flake-compat_3",
-        "flake-parts": "flake-parts_4",
+        "flake-parts": "flake-parts_3",
         "git-hooks-nix": "git-hooks-nix_2",
         "nixfmt": "nixfmt",
         "nixpkgs": [
@@ -416,7 +398,7 @@
     },
     "nixops4": {
       "inputs": {
-        "flake-parts": "flake-parts_3",
+        "flake-parts": "flake-parts_2",
         "nix": "nix",
         "nix-cargo-integration": "nix-cargo-integration",
         "nixpkgs": "nixpkgs_3",
@@ -438,7 +420,7 @@
     },
     "nixops4-nixos": {
       "inputs": {
-        "flake-parts": "flake-parts_2",
+        "flake-parts": "flake-parts",
         "git-hooks-nix": "git-hooks-nix",
         "nixops4": "nixops4",
         "nixops4-nixos": [
@@ -520,18 +502,6 @@
         "url": "https://github.com/NixOS/nixpkgs/archive/072a6db25e947df2f31aab9eccd0ab75d5b2da11.tar.gz"
       }
     },
-    "nixpkgs-lib_3": {
-      "locked": {
-        "lastModified": 1738452942,
-        "narHash": "sha256-vJzFZGaCpnmo7I6i416HaBLpC+hvcURh/BQwROcGIp8=",
-        "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs/archive/072a6db25e947df2f31aab9eccd0ab75d5b2da11.tar.gz"
-      },
-      "original": {
-        "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs/archive/072a6db25e947df2f31aab9eccd0ab75d5b2da11.tar.gz"
-      }
-    },
     "nixpkgs-old": {
       "locked": {
         "lastModified": 1735563628,
@@ -664,7 +634,6 @@
     },
     "root": {
       "inputs": {
-        "flake-parts": "flake-parts",
         "git-hooks": "git-hooks",
         "nixops4": [
           "nixops4-nixos",
diff --git a/flake.nix b/flake.nix
index 5af7d4f5..5c816a0f 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,6 +1,5 @@
 {
   inputs = {
-    flake-parts.url = "github:hercules-ci/flake-parts";
     git-hooks.url = "github:cachix/git-hooks.nix";
     nixops4.follows = "nixops4-nixos/nixops4";
     nixops4-nixos.url = "github:nixops4/nixops4-nixos";
diff --git a/mkFlake.nix b/mkFlake.nix
index 4695253e..59d2d93a 100644
--- a/mkFlake.nix
+++ b/mkFlake.nix
@@ -1,7 +1,7 @@
 ## This file contains a tweak of flake-parts's `mkFlake` function to splice in
 ## sources taken from npins.
 
-inputs@{ self, flake-parts, ... }:
+inputs@{ self, ... }:
 
 let
   sources = import ./npins;
@@ -18,11 +18,13 @@ let
   self' = self // {
     inputs = inputs';
   };
+
+  flake-parts-lib = import "${sources.flake-parts}/lib.nix" { inherit (nixpkgs) lib; };
 in
 
 # XXX - finally we override the overall set of `inputs` -- we need both:
 #       `flake-parts obtains `nixpkgs` from `self.inputs` and not from `inputs`.
-flake-parts.lib.mkFlake {
+flake-parts-lib.mkFlake {
   inputs = inputs // {
     inherit nixpkgs;
   };