diff --git a/Cargo.toml b/Cargo.toml
index a17c6a8..b8aef1c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "polygon-art"
-version = "1.0.0"
+version = "1.0.1"
 authors = ["Ingolf Wagner <contact@ingolf-wagner.de>"]
 edition = "2018"
 
diff --git a/README.md b/README.md
index d5331e4..1085afc 100644
--- a/README.md
+++ b/README.md
@@ -36,11 +36,6 @@ cargo run --example clipping -- --help # run the examples/clipping
 ```shell
 nix build
 ```
-or (if you haven't enabled flakes yet)
-
-``` shell
-nix-shell -p nixFlake --run "nix build"
-```
 
 # How to us it (with flakes)
 
@@ -68,3 +63,14 @@ nix-shell -p nixFlake --run "nix build"
 }
 ```
 
+# How to update
+
+``` shell
+cargo update # to update Cargo.lock
+```
+and
+
+``` shell
+nix flake update # to update flake.lock
+nix build        # to verify if everything is ok
+```
diff --git a/default.nix b/default.nix
index e9fb6c5..432eec3 100644
--- a/default.nix
+++ b/default.nix
@@ -1,5 +1,4 @@
 { rustPlatform,
-  fetchgit,
   lib,
   cairo,
   geos,
@@ -14,18 +13,8 @@
 rustPlatform.buildRustPackage {
 
   pname = "polygon-art";
-
-  version = "1.0.0";
-
-  # nix-prefetch-git-rendered --rev refs/heads/develop https://git.ingolf-wagner.de/palo/polygon-art.git
-  #src = fetchgit {
-  #  url = "https://git.ingolf-wagner.de/palo/polygon-art.git";
-  #  rev = "dfb6e0789ec67ee649050ad3b16d8b6a6b38955d";
-  #  sha256 = "0iqmikvl93pazxfd120hcr0waxav7zy6px5kmdqxifrjgdbda9xx";
-  #};
+  version = "1.0.1";
   src = ./.;
-
-  #cargoSha256 = "05rkn8iihj4j9k179xx7wn2a07hxks050raj6fbxmj6gdx6aj170";
   cargoSha256 = "0sgk4hw77cxqbqzd258fz67r7fpjblkm7cqh14n5f1c43y8vgxa0";
   verifyCargoDeps = true;
 
diff --git a/flake.nix b/flake.nix
index d92c23b..7c51ce4 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,9 +1,6 @@
 {
   description = "Framework with examples to generate plotter friendly SVGs";
-
-  #inputs.nixpkgs.url = "github:nixos/nixpkgs/nixos-21.05";
   inputs.flake-utils.url = "github:numtide/flake-utils";
-
   outputs = { self, nixpkgs, flake-utils , ... }:
     flake-utils.lib.eachDefaultSystem (system:
       let
@@ -12,6 +9,7 @@
       in {
         packages.polygon-art = polygon-art;
         defaultPackage = polygon-art;
+        devShell = import ./shell.nix { inherit pkgs; };
       }
     );
 }