diff --git a/.forgejo/workflows/test.yaml b/.forgejo/workflows/test.yaml
index 5fe9a35..5a768bf 100644
--- a/.forgejo/workflows/test.yaml
+++ b/.forgejo/workflows/test.yaml
@@ -2,30 +2,27 @@ name: Test
 
 on:
   push:
-    branches:
-      - main
   pull_request:
-    branches:
-      - main
   schedule:
     - cron: '0 0 1 * *' # Monthly
 
-
 env:
   SLIGRO_USERNAME: ${{ secrets.SLIGRO_USERNAME }}
   SLIGRO_PASSWORD: ${{ secrets.SLIGRO_PASSWORD }}
 
+defaults:
+  run:
+    shell: nix develop --command {0}
+
 jobs:
 
-  pytest:
-    runs-on: docker
-    container:
-      image: alpine:latest
+  test:
+    runs-on: nix
     steps:
-    - run: apk add nodejs py3-pip ruff
     - uses: actions/checkout@v4
-    - run: pip install -r requirements.txt --break-system-packages
+
+    - name: Populate /nix/store
+      run: echo done
 
     - run: pytest
-
     - run: ruff check
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..67f87df
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,61 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1752480373,
+        "narHash": "sha256-JHQbm+OcGp32wAsXTE/FLYGNpb+4GLi5oTvCxwSoBOA=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "62e0f05ede1da0d54515d4ea8ce9c733f12d9f08",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "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/flake.nix b/flake.nix
new file mode 100644
index 0000000..07daac7
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,53 @@
+{
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs { system = system; };
+        pyprojecttoml = nixpkgs.lib.importTOML ./pyproject.toml;
+
+        supermarktconnector = pkgs.python3Packages.buildPythonPackage {
+          pname = "supermarktconnector";
+          version = "0.8.1-2";
+          format = "setuptools";
+          src = pkgs.fetchFromGitHub {
+            owner = "bartmachielsen";
+            repo = "SupermarktConnector";
+            rev = "393c8698a34393f233a0bef45022954bfabe4247";
+            hash = "sha256-OuCcwh58HdEsA2h6WGEgKDcyw4RH4NzHlVr7kY3DEHE=";
+          };
+        };
+
+      in rec {
+
+        packages.default = pkgs.python3Packages.buildPythonPackage {
+          pname = pyprojecttoml.project.name;
+          version = pyprojecttoml.project.version;
+          pyproject = true;
+          src = self;
+          dependencies = with pkgs.python3Packages; [ pyquery pytest requests ]
+            ++ [supermarktconnector];
+          nativeBuildInputs = with pkgs.python3Packages; [ setuptools ];
+          nativeCheckInputs = with pkgs.python3Packages; [ pytest ]
+            ++ [ pkgs.ruff ];
+          dontCheck = true; # Makes network requests.
+          checkPhase = ''
+            runHook preCheck
+            ruff check
+            runHook postCheck
+          '';
+        };
+
+        packages.editable = pkgs.python3Packages.mkPythonEditablePackage {
+          inherit (packages.default) name version dependencies;
+          root = "$PWD/src";
+          passthru = { inherit (packages.default) nativeCheckInputs; };
+        };
+
+      }
+    );
+}
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..83a87eb
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,3 @@
+[project]
+name = "revbank-inflatinator"
+version = "0.0.1"
diff --git a/requirements.txt b/requirements.txt
deleted file mode 100644
index 68df88e..0000000
--- a/requirements.txt
+++ /dev/null
@@ -1,4 +0,0 @@
-pyquery
-pytest
-requests
-supermarktconnector