diff --git a/flake.lock b/flake.lock
index f88daae..aa94486 100644
--- a/flake.lock
+++ b/flake.lock
@@ -19,24 +19,6 @@
       }
     },
     "nixpkgs": {
-      "inputs": {
-        "nixpkgs": "nixpkgs_2"
-      },
-      "locked": {
-        "lastModified": 1733437725,
-        "narHash": "sha256-ridu0NcO4Dr2TsHqPE+kh58xTHcXg7IHq/FF74KrP/g=",
-        "owner": "nix-ocaml",
-        "repo": "nix-overlays",
-        "rev": "03b85ffd6c37255829d475f3584f8d8a1556d5f2",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-ocaml",
-        "repo": "nix-overlays",
-        "type": "github"
-      }
-    },
-    "nixpkgs_2": {
       "locked": {
         "lastModified": 1733380312,
         "narHash": "sha256-ywntxT10Om755wkB9tYgJwEwELQZKYAO5WcNuHv1vjI=",
@@ -52,10 +34,28 @@
         "type": "github"
       }
     },
+    "nixpkgs-oc": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      },
+      "locked": {
+        "lastModified": 1733437725,
+        "narHash": "sha256-ridu0NcO4Dr2TsHqPE+kh58xTHcXg7IHq/FF74KrP/g=",
+        "owner": "nix-ocaml",
+        "repo": "nix-overlays",
+        "rev": "03b85ffd6c37255829d475f3584f8d8a1556d5f2",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-ocaml",
+        "repo": "nix-overlays",
+        "type": "github"
+      }
+    },
     "root": {
       "inputs": {
         "flake-utils": "flake-utils",
-        "nixpkgs": "nixpkgs"
+        "nixpkgs-oc": "nixpkgs-oc"
       }
     },
     "systems": {
diff --git a/flake.nix b/flake.nix
index 0b86b5c..6eb7819 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,6 +1,6 @@
 {
   inputs = {
-    nixpkgs.url = "github:nix-ocaml/nix-overlays";
+    nixpkgs-oc.url = "github:nix-ocaml/nix-overlays";
     flake-utils.url = "github:numtide/flake-utils";
   };
 
@@ -11,14 +11,14 @@
 
   outputs = {
     self,
-    nixpkgs,
+    nixpkgs-oc,
     flake-utils,
   }: let
     version = builtins.toString self.lastModified;
   in
     flake-utils.lib.eachDefaultSystem (
       system: let
-        pkgs = nixpkgs.legacyPackages.${system};
+        pkgs = nixpkgs-oc.legacyPackages.${system};
         # import nixpkgs {
         #   inherit system;
         # };
@@ -100,7 +100,7 @@
       }
     )
     // {
-      nixosModules.culr = import ./nix/module.nix {overlays = [self.overlays.culr self.inputs.nixpkgs.overlays.default];};
+      nixosModules.culr = import ./nix/module.nix {overlays = [self.overlays.culr nixpkgs-oc.overlays.default];};
 
       overlays.culr = final: prev: let
         ocaml-deps = let