diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..8e159b2
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,26 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1702876093,
+        "narHash": "sha256-LgZ6qc+fNK04ChCXs5vz7GQP93XE2D5pYAkOl5bk8bE=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "5fcb8660ddddb1ec92ebcfa048f7ef4f11260a27",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..cabde49
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,38 @@
+{
+  description = "Insecure mock server for OAuth2";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs";
+  };
+
+  outputs = { self, nixpkgs }:
+    let
+      system = "x86_64-linux";
+      name = "oauth2-mock-server";
+      pkgs = import nixpkgs { inherit system; };
+      stackWrapper = pkgs.symlinkJoin {
+        name = "stack";
+        paths = [ pkgs.stack ];
+        buildInputs = with pkgs; [ makeWrapper ];
+        postBuild = ''
+          wrapProgram $out/bin/stack \
+            --add-flags "--no-install-ghc"
+        '';
+      };
+      buildInputs = [ stackWrapper ] ++ (
+        with pkgs; [ reuse zlib ] ++ (
+          with haskell.packages."ghc927"; [ ghc haskell-language-server ]
+        )
+      );
+    in {
+
+    packages.${system}.${name} = nixpkgs.legacyPackages.${system}.${name};
+    packages.${system}.default = self.packages.${system}.${name};
+
+    devShells.${system}.default = pkgs.mkShell {
+      buildInputs = buildInputs;
+      LD_LIBRARY_PATH = pkgs.lib.makeLibraryPath buildInputs;
+    };
+  };
+}
+
diff --git a/stack.yaml b/stack.yaml
index ec5fd64..8ad91c4 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -9,16 +9,18 @@
 # to be used for project dependencies. For example:
 #
 # resolver: lts-3.5
+resolver: lts-20.24
 # resolver: nightly-2015-09-21
 # resolver: ghc-7.10.2
+# resolver: ghc-9.4.4
 #
 # The location of a snapshot can be provided as a file or url. Stack assumes
 # a snapshot provided as a file might change, whereas a url resource does not.
 #
 # resolver: ./custom-snapshot.yaml
 # resolver: https://example.com/snapshots/2018-01-01.yaml
-resolver:
-  url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/22/0.yaml
+# resolver:
+#   url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/22/0.yaml
 
 # User packages to be built.
 # Various formats can be used as shown in the example below.
@@ -35,7 +37,12 @@ packages:
 # These entries can reference officially published versions as well as
 # forks / in-progress versions pinned to a git hash. For example:
 #
-# extra-deps:
+extra-deps:
+  #  - aeson-2.2.1.0
+  #  - servant-0.20.1
+  #  - servant-server-0.20
+  #  - warp-3.3.31
+ 
 # - acme-missiles-0.3
 # - git: https://github.com/commercialhaskell/stack.git
 #   commit: e7b331f14bcffb8367cd58fbfc8b40ec7642100a
@@ -50,6 +57,8 @@ packages:
 
 # Control whether we use the GHC we find on the path
 system-ghc: true
+nix:
+  enable: false
 #
 # Require a specific version of Stack, using version ranges
 # require-stack-version: -any # Default
@@ -65,3 +74,5 @@ arch: x86_64
 #
 # Allow a newer minor version of GHC than the snapshot specifies
 # compiler-check: newer-minor
+#allow-newer: true
+
diff --git a/stack.yaml.lock b/stack.yaml.lock
index a39a124..84da166 100644
--- a/stack.yaml.lock
+++ b/stack.yaml.lock
@@ -6,8 +6,7 @@
 packages: []
 snapshots:
 - completed:
-    sha256: e176944bc843f740e05242fa7a66ca1f440c127e425254f7f1257f9b19add23f
-    size: 712153
-    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/22/0.yaml
-  original:
-    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/22/0.yaml
+    sha256: e019cd29e3f7f9dbad500225829a3f7a50f73c674614f2f452e21bb8bf5d99ea
+    size: 650253
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/20/24.yaml
+  original: lts-20.24