diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index fd5f59f..ab08364 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -12,5 +12,6 @@ jobs:
         with:
           nix_path: nixpkgs=channel:nixos-unstable
       - name: Setup erlang
-        run: cd sequential/installing && nix-shell
-      - run: make test PROFILE=ci
+        run: cd sequential/installing && nix develop
+      - name: Re-use nix flake to check erlang tests
+        run: cd sequential/installing && nix develop --command bash -c "cd ../../ && make test PROFILE=ci"
diff --git a/sequential/installing/flake.lock b/sequential/installing/flake.lock
new file mode 100644
index 0000000..69e7deb
--- /dev/null
+++ b/sequential/installing/flake.lock
@@ -0,0 +1,62 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1710146030,
+        "narHash": "sha256-SZ5L6eA7HJ/nmkzGG7/ISclqe6oZdOZTNoesiInkXPQ=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "b1d9ab70662946ef0850d488da1c9019f3a9752a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "ref": "main",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1717179513,
+        "narHash": "sha256-vboIEwIQojofItm2xGCdZCzW96U85l9nDW3ifMuAIdM=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "63dacb46bf939521bdc93981b4cbb7ecb58427a0",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "24.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/sequential/installing/flake.nix b/sequential/installing/flake.nix
index 80e5e0c..7f4be4f 100644
--- a/sequential/installing/flake.nix
+++ b/sequential/installing/flake.nix
@@ -2,8 +2,8 @@
   description = "A flake to download Erlang 27 and Rebar3 from Nixpkgs 24.05";
 
   inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs/24.05"; # Pinning to Nixpkgs version 24.05
-    flake-utils.url = "github:numtide/flake-utils";
+    nixpkgs.url = "github:NixOS/nixpkgs/24.05";
+    flake-utils.url = "github:numtide/flake-utils/main";
   };
 
   outputs = { self, nixpkgs, flake-utils, ... }:
@@ -13,8 +13,8 @@
       in {
         packages.default = pkgs.mkShell {
           buildInputs = [
-            pkgs.erlang_27    # Erlang 27
-            pkgs.rebar3       # Rebar3
+            pkgs.erlang_27    
+            pkgs.rebar3       
           ];
         };
       });
diff --git a/sequential/installing/shell.nix b/sequential/installing/shell.nix
deleted file mode 100644
index 46af1ef..0000000
--- a/sequential/installing/shell.nix
+++ /dev/null
@@ -1,9 +0,0 @@
-let
-  pkgs = import <nixpkgs> { config = {}; overlays = []; };
-in
-pkgs.mkShell {
-  packages = [
-    (pkgs.erlang.override { version = "27.0.1"; })
-    pkgs.beamPackages.rebar3
-  ];
-}