diff --git a/nixos/syncthing.nix b/nixos/syncthing.nix
index 04485afd..a22cbf23 100644
--- a/nixos/syncthing.nix
+++ b/nixos/syncthing.nix
@@ -1,20 +1,10 @@
 { config, pkgs, ... }:
-let
-  unstableTarball = fetchTarball https://github.com/NixOS/nixpkgs-channels/archive/nixos-unstable.tar.gz;
-in
-  {
-    nixpkgs.config = {
-      packageOverrides = pkgs: {
-        unstable = import unstableTarball {
-          config = config.nixpkgs.config;
-        };
-      };
-    };
-    services.syncthing = {
-      enable = true;
-      user = "cyryl";
-      dataDir = "/home/cyryl/.syncthing";
-      openDefaultPorts = true;
-      package = pkgs.unstable.syncthing;
-    };
-  }
+{
+  services.syncthing = {
+    enable = true;
+    user = "cyryl";
+    dataDir = "/home/cyryl/.syncthing";
+    openDefaultPorts = true;
+    package = pkgs.unstable.syncthing;
+  };
+}
diff --git a/nixos/virtualbox.nix b/nixos/virtualbox.nix
index 804da6fc..11467b2a 100644
--- a/nixos/virtualbox.nix
+++ b/nixos/virtualbox.nix
@@ -1,19 +1,9 @@
 { config, pkgs, ... }:
-let
-  unstableTarball = fetchTarball https://github.com/NixOS/nixpkgs-channels/archive/nixos-unstable.tar.gz;
-in
-  {
-    nixpkgs.config = {
-      packageOverrides = pkgs: {
-        unstable = import unstableTarball {
-          config = config.nixpkgs.config;
-        };
-      };
-    };
-    virtualisation.virtualbox.host = {
-      enable = true;
-      enableExtensionPack = true;
-      enableHardening = true;
-      package = pkgs.virtualbox.override { enable32bitGuests = false; };
-    };
-  }
+{
+  virtualisation.virtualbox.host = {
+    enable = true;
+    enableExtensionPack = true;
+    enableHardening = true;
+    package = pkgs.virtualbox.override { enable32bitGuests = false; };
+  };
+}
diff --git a/nixos/vscode.nix b/nixos/vscode.nix
index 590c27cd..f8e8bd7e 100644
--- a/nixos/vscode.nix
+++ b/nixos/vscode.nix
@@ -1,156 +1,143 @@
 { config, pkgs, ... }:
-
-let
-  unstableTarball = fetchTarball https://github.com/NixOS/nixpkgs-channels/archive/nixos-unstable.tar.gz;
-in
-  {
-    nixpkgs.config = {
-      allowUnfree = true;
-      packageOverrides = pkgs: {
-        unstable = import unstableTarball {
-          config = config.nixpkgs.config;
-        };
-      };
+{
+  users.users.cyryl = {
+    packages = with pkgs; [
+      (unstable.vscode-with-extensions.override {
+        vscodeExtensions = with vscode-extensions; [ bbenoist.Nix  ]
+        ++ vscode-utils.extensionsFromVscodeMarketplace [
+          {
+            publisher = "ms-python";
+            name = "python";
+            version = "2019.10.41019";
+            sha256 = "0szikd76vy8mgv8zc0m90rx1jrnwwphx5bb8928drln65xwbzs1q";
+          }
+          {
+            publisher = "justusadam";
+            name = "language-haskell";
+            version = "2.6.0";
+            sha256 = "1891pg4x5qkh151pylvn93c4plqw6vgasa4g40jbma5xzq8pygr4";
+          }
+          {
+            publisher = "UCL";
+            name = "haskelly";
+            version = "0.5.5";
+            sha256 = "0s6a3hdckn2ssk7wkxdv09c0gjk4g0h8071bf7x8br0brnnrwsgi";
+          }
+          {
+            publisher = "TabNine";
+            name = "tabnine-vscode";
+            version = "2.1.10";
+            sha256 = "10z9xn9haagyky5h9f8r7jfj5q9973lxknjqjm7bqks0qmvpxif3";
+          }
+          {
+            publisher = "2gua";
+            name = "rainbow-brackets";
+            version = "0.0.6";
+            sha256 = "1m5c7jjxphawh7dmbzmrwf60dz4swn8c31svbzb5nhaazqbnyl2d";
+          }
+          {
+            publisher = "vscodevim";
+            name = "vim";
+            version = "1.4.0";
+            sha256 = "0vfhvsp485rgik3pjzbpnc4jxrjpiykynl563a16rlz8h85x2m4f";
+          }
+          {
+            publisher = "swyphcosmo";
+            name = "spellchecker";
+            version = "1.2.13";
+            sha256 = "1lr33lf01afgi74c1a9gylk92li4hyq24l8bki4l6ggl4z4c2h3w";
+          }
+          {
+            publisher = "asabil";
+            name = "meson";
+            version = "1.1.1";
+            sha256 = "00cc28a2nb325f54bx51wf5q15x1pmsn0j9z6rnxxqxwii1dm5cl";
+          }
+          {
+            publisher = "bungcip";
+            name = "better-toml";
+            version = "0.3.2";
+            sha256 = "08lhzhrn6p0xwi0hcyp6lj9bvpfj87vr99klzsiy8ji7621dzql3";
+          }
+          {
+            publisher = "codezombiech";
+            name = "gitignore";
+            version = "0.6.0";
+            sha256 = "0gnc0691pwkd9s8ldqabmpfvj0236rw7bxvkf0bvmww32kv1ia0b";
+          }
+          {
+            publisher = "DavidAnson";
+            name = "vscode-markdownlint";
+            version = "0.26.0";
+            sha256 = "0g4pssvajn7d8p2547v7313gjyqx4pzs7cbjws2s3v2fk1sw7vbj";
+          }
+          {
+            publisher = "esbenp";
+            name = "prettier-vscode";
+            version = "1.8.1";
+            sha256 = "0qcm2784n9qc4p77my1kwqrswpji7bp895ay17yzs5g84cj010ln";
+          }
+          {
+            publisher = "hbenl";
+            name = "vscode-test-explorer";
+            version = "2.9.3";
+            sha256 = "1yf85hgvganxq5n5jff9ckn3smxd6xi79cgn6k53qi5w1r5rahy0";
+          }
+          {
+            publisher = "lextudio";
+            name = "restructuredtext";
+            version = "106.0.0";
+            sha256 = "096r8071202nxi1is6z7dghcmpsh0f0mm3mp3cfh1yj2mnyzlaxa";
+          }
+          {
+            publisher = "lostintangent";
+            name = "vsls-pomodoro";
+            version = "0.1.0";
+            sha256 = "1b73zbkhlhacvi18cx4g3n6randy3hw9cab1gkw5gzb3375w7w3p";
+          }
+          {
+            publisher = "lostintangent";
+            name = "vsls-whiteboard";
+            version = "0.0.8";
+            sha256 = "13fcay9bs861msb5y694casbw66dmhl504xm5cvprssx1qka186p";
+          }
+          {
+            publisher = "mauve";
+            name = "terraform";
+            version = "1.3.9";
+            sha256 = "0hnarr21rivvv41y5x1sp0skdmzwz7zi9aya3n5z1b13ir7lyy42";
+          }
+          {
+            publisher = "mechatroner";
+            name = "rainbow-csv";
+            version = "1.0.0";
+            sha256 = "1fyamgm7zq31r3c00cn6pcb66rrkfhwfmp72qnhrajydmnvcnbg6";
+          }
+          {
+            publisher = "ms-vscode";
+            name = "Go";
+            version = "0.9.2";
+            sha256 = "0yxnsby8zz1dvnx8nqrhi4xx316mpjf2hs2c5r6fkzh8zhjccwqz";
+          }
+          {
+            publisher = "ronnidc";
+            name = "nunjucks";
+            version = "0.2.3";
+            sha256 = "119xgyn1dggw2rcqkn2mnz364iw5jlrxg7pcydbijsqj5d3zdfsf";
+          }
+          {
+            publisher = "rust-lang";
+            name = "rust";
+            version = "0.6.1";
+            sha256 = "0f66z6b374nvnrn7802dg0xz9f8wq6sjw3sb9ca533gn5jd7n297";
+          }
+          {
+            publisher = "serayuzgur";
+            name = "crates";
+            version = "0.4.2";
+            sha256 = "1knspsc98cfw4mhc0yaz0f2185sxdf9kn9qsysfs6c82g9wjaqcj";
+          }
+        ];})
+      ];
     };
-
-    users.users.cyryl = {
-      packages = with pkgs; [
-        (unstable.vscode-with-extensions.override {
-          vscodeExtensions = with vscode-extensions; [ bbenoist.Nix  ]
-          ++ vscode-utils.extensionsFromVscodeMarketplace [
-            {
-              publisher = "ms-python";
-              name = "python";
-              version = "2019.10.41019";
-              sha256 = "0szikd76vy8mgv8zc0m90rx1jrnwwphx5bb8928drln65xwbzs1q";
-            }
-            {
-              publisher = "justusadam";
-              name = "language-haskell";
-              version = "2.6.0";
-              sha256 = "1891pg4x5qkh151pylvn93c4plqw6vgasa4g40jbma5xzq8pygr4";
-            }
-            {
-              publisher = "UCL";
-              name = "haskelly";
-              version = "0.5.5";
-              sha256 = "0s6a3hdckn2ssk7wkxdv09c0gjk4g0h8071bf7x8br0brnnrwsgi";
-            }
-            {
-              publisher = "TabNine";
-              name = "tabnine-vscode";
-              version = "2.1.10";
-              sha256 = "10z9xn9haagyky5h9f8r7jfj5q9973lxknjqjm7bqks0qmvpxif3";
-            }
-            {
-              publisher = "2gua";
-              name = "rainbow-brackets";
-              version = "0.0.6";
-              sha256 = "1m5c7jjxphawh7dmbzmrwf60dz4swn8c31svbzb5nhaazqbnyl2d";
-            }
-            {
-              publisher = "vscodevim";
-              name = "vim";
-              version = "1.4.0";
-              sha256 = "0vfhvsp485rgik3pjzbpnc4jxrjpiykynl563a16rlz8h85x2m4f";
-            }
-            {
-              publisher = "swyphcosmo";
-              name = "spellchecker";
-              version = "1.2.13";
-              sha256 = "1lr33lf01afgi74c1a9gylk92li4hyq24l8bki4l6ggl4z4c2h3w";
-            }
-            {
-              publisher = "asabil";
-              name = "meson";
-              version = "1.1.1";
-              sha256 = "00cc28a2nb325f54bx51wf5q15x1pmsn0j9z6rnxxqxwii1dm5cl";
-            }
-            {
-              publisher = "bungcip";
-              name = "better-toml";
-              version = "0.3.2";
-              sha256 = "08lhzhrn6p0xwi0hcyp6lj9bvpfj87vr99klzsiy8ji7621dzql3";
-            }
-            {
-              publisher = "codezombiech";
-              name = "gitignore";
-              version = "0.6.0";
-              sha256 = "0gnc0691pwkd9s8ldqabmpfvj0236rw7bxvkf0bvmww32kv1ia0b";
-            }
-            {
-              publisher = "DavidAnson";
-              name = "vscode-markdownlint";
-              version = "0.26.0";
-              sha256 = "0g4pssvajn7d8p2547v7313gjyqx4pzs7cbjws2s3v2fk1sw7vbj";
-            }
-            {
-              publisher = "esbenp";
-              name = "prettier-vscode";
-              version = "1.8.1";
-              sha256 = "0qcm2784n9qc4p77my1kwqrswpji7bp895ay17yzs5g84cj010ln";
-            }
-            {
-              publisher = "hbenl";
-              name = "vscode-test-explorer";
-              version = "2.9.3";
-              sha256 = "1yf85hgvganxq5n5jff9ckn3smxd6xi79cgn6k53qi5w1r5rahy0";
-            }
-            {
-              publisher = "lextudio";
-              name = "restructuredtext";
-              version = "106.0.0";
-              sha256 = "096r8071202nxi1is6z7dghcmpsh0f0mm3mp3cfh1yj2mnyzlaxa";
-            }
-            {
-              publisher = "lostintangent";
-              name = "vsls-pomodoro";
-              version = "0.1.0";
-              sha256 = "1b73zbkhlhacvi18cx4g3n6randy3hw9cab1gkw5gzb3375w7w3p";
-            }
-            {
-              publisher = "lostintangent";
-              name = "vsls-whiteboard";
-              version = "0.0.8";
-              sha256 = "13fcay9bs861msb5y694casbw66dmhl504xm5cvprssx1qka186p";
-            }
-            {
-              publisher = "mauve";
-              name = "terraform";
-              version = "1.3.9";
-              sha256 = "0hnarr21rivvv41y5x1sp0skdmzwz7zi9aya3n5z1b13ir7lyy42";
-            }
-            {
-              publisher = "mechatroner";
-              name = "rainbow-csv";
-              version = "1.0.0";
-              sha256 = "1fyamgm7zq31r3c00cn6pcb66rrkfhwfmp72qnhrajydmnvcnbg6";
-            }
-            {
-              publisher = "ms-vscode";
-              name = "Go";
-              version = "0.9.2";
-              sha256 = "0yxnsby8zz1dvnx8nqrhi4xx316mpjf2hs2c5r6fkzh8zhjccwqz";
-            }
-            {
-              publisher = "ronnidc";
-              name = "nunjucks";
-              version = "0.2.3";
-              sha256 = "119xgyn1dggw2rcqkn2mnz364iw5jlrxg7pcydbijsqj5d3zdfsf";
-            }
-            {
-              publisher = "rust-lang";
-              name = "rust";
-              version = "0.6.1";
-              sha256 = "0f66z6b374nvnrn7802dg0xz9f8wq6sjw3sb9ca533gn5jd7n297";
-            }
-            {
-              publisher = "serayuzgur";
-              name = "crates";
-              version = "0.4.2";
-              sha256 = "1knspsc98cfw4mhc0yaz0f2185sxdf9kn9qsysfs6c82g9wjaqcj";
-            }
-          ];})
-        ];
-      };
-    }
+  }