diff --git a/flake.nix b/flake.nix
index f95d1a0..4c888ed 100644
--- a/flake.nix
+++ b/flake.nix
@@ -2,21 +2,23 @@
   description = "basic rust flake";
 
   inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs/nixos-21.11";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-22.05";
     nixpkgs-unstable.url = "github:NixOS/nixpkgs/nixos-unstable";
-    rust-overlay.url = "github:oxalica/rust-overlay";
-    flake-utils.url = "github:numtide/flake-utils";
-    flake-compat = {
-      url = "github:edolstra/flake-compat";
-      flake = false;
+    rust-overlay = {
+      url = "github:oxalica/rust-overlay";
+      inputs = {
+        nixpkgs.follows = "nixpkgs";
+        flake-utils.follows = "flake-utils";
+      };
     };
+    flake-utils.url = "github:numtide/flake-utils";
     gitignoresrc = {
       url = "github:hercules-ci/gitignore.nix";
       flake = false;
     };
   };
 
-  outputs = { self, nixpkgs, nixpkgs-unstable, flake-utils, flake-compat, gitignoresrc, rust-overlay, ... }@inputs:
+  outputs = { self, nixpkgs, nixpkgs-unstable, flake-utils, gitignoresrc, rust-overlay, ... }@inputs:
     {
       #overlay = import ./nix { inherit gitignoresrc; };
     } // (flake-utils.lib.eachDefaultSystem (system:
@@ -35,11 +37,13 @@
             buildInputs = [
               pkgs.rust-bin.nightly.latest.rustfmt
               pkgs.rust-bin.stable.latest.default
-              unstable.rust-analyzer
+              pkgs.rust-analyzer
               pkgs.cargo-audit
               pkgs.cargo-license
               pkgs.cargo-tarpaulin
               pkgs.cargo-kcov
+              pkgs.valgrind
+              pkgs.gnuplot
               pkgs.kcov
             ];
           };