diff --git a/flake.nix b/flake.nix
index 94d580346..09109897e 100644
--- a/flake.nix
+++ b/flake.nix
@@ -72,11 +72,14 @@
       let
         pkgs = import nixpkgs {
           inherit system;
-          config.allowAliases = false;
+          config = {
+            allowAliases = false;
+            allowInsecure = true;
+          };
         };
 
         poetry2nix = import ./default.nix { inherit pkgs; };
-        p2nix-tools = pkgs.callPackage ./tools { };
+        p2nix-tools = pkgs.callPackage ./tools { inherit poetry2nix; };
       in
       rec {
         formatter = treefmtEval.${system}.config.build.wrapper;
diff --git a/tools/default.nix b/tools/default.nix
index 8e675b819..2759874d3 100644
--- a/tools/default.nix
+++ b/tools/default.nix
@@ -1,9 +1,4 @@
-{ pkgs ? import <nixpkgs> {
-    overlays = [
-      (import ../overlay.nix)
-    ];
-  }
-}:
+{ pkgs, poetry2nix }:
 let
   inherit (pkgs) lib;
 
@@ -36,7 +31,7 @@ in
       flamegraph.pl $workdir/traceFile.folded > poetry2nix-flamegraph.svg
     '';
 
-  env = pkgs.poetry2nix.mkPoetryEnv {
+  env = poetry2nix.mkPoetryEnv {
     projectDir = ./.;
   };