diff --git a/pkgs/by-name/fa/fastapi-dls/add-algorithms-argument.patch b/pkgs/by-name/fa/fastapi-dls/add-algorithms-argument.patch
new file mode 100644
index 0000000000000..216c6763a7f84
--- /dev/null
+++ b/pkgs/by-name/fa/fastapi-dls/add-algorithms-argument.patch
@@ -0,0 +1,10 @@
+--- a/app/main.py
++++ b/app/main.py
+@@ -340,7 +340,7 @@
+     j, cur_time = json_loads((await request.body()).decode('utf-8')), datetime.utcnow()
+ 
+     try:
+-        payload = jwt.decode(token=j.get('auth_code'), key=jwt_decode_key)
++        payload = jwt.decode(token=j.get('auth_code'), key=jwt_decode_key, algorithms=ALGORITHMS.RS256)
+     except JWTError as e:
+         return JSONr(status_code=400, content={'status': 400, 'title': 'invalid token', 'detail': str(e)})
diff --git a/pkgs/by-name/fa/fastapi-dls/package.nix b/pkgs/by-name/fa/fastapi-dls/package.nix
new file mode 100644
index 0000000000000..273356c8e8621
--- /dev/null
+++ b/pkgs/by-name/fa/fastapi-dls/package.nix
@@ -0,0 +1,73 @@
+{
+  lib,
+  python3,
+  fetchFromGitLab,
+  gitUpdater,
+  makeWrapper,
+}:
+
+let
+
+  pythonEnv = python3.withPackages (
+    packages:
+    with packages;
+    [
+      fastapi
+      uvicorn
+      python-jose
+      pycryptodome
+      python-dateutil
+      sqlalchemy
+      markdown
+      python-dotenv
+    ]
+    ++ uvicorn.optional-dependencies.standard
+  );
+
+  version = "1.4.1";
+
+in
+python3.pkgs.buildPythonApplication {
+  pname = "fastapi-dls";
+  inherit version;
+  pyproject = false;
+
+  src = fetchFromGitLab {
+    domain = "git.collinwebdesigns.de";
+    owner = "oscar.krause";
+    repo = "fastapi-dls";
+    rev = "refs/tags/${version}";
+    hash = "sha256-H4mtmJ4iQXPZFWQPm12aH/kdg9TAMgHkvkbaHfxfS3I=";
+  };
+
+  patches = [
+    ./add-algorithms-argument.patch # fixes license activation
+  ];
+
+  # Don't create .orig files if the patch isn't an exact match.
+  patchFlags = [
+    "--no-backup-if-mismatch"
+    "-p1"
+  ];
+
+  postInstall = ''
+    mkdir -p $out/bin $out/share/fastapi-dls
+    cp -r README.md app $out/share/fastapi-dls
+
+    makeWrapper ${pythonEnv}/bin/uvicorn $out/bin/fastapi-dls \
+      --add-flags "--app-dir $out/share/fastapi-dls/app" \
+      --add-flags "--proxy-headers" \
+      --add-flags "main:app"
+  '';
+
+  passthru.updateScript = gitUpdater { };
+
+  meta = {
+    description = "Minimal Delegated License Service (DLS)";
+    homepage = "https://git.collinwebdesigns.de/oscar.krause/fastapi-dls";
+    license = lib.licenses.unfree;
+    mainProgram = "fastapi-dls";
+    platforms = lib.platforms.linux;
+    maintainers = with lib.maintainers; [ MakiseKurisu ];
+  };
+}