diff --git a/third_party/nixpkgs/patches/pr105296-factorio-updatescript.patch b/third_party/nixpkgs/patches/pr105296-factorio-updatescript.patch
new file mode 100644
index 0000000000..f247e7c237
--- /dev/null
+++ b/third_party/nixpkgs/patches/pr105296-factorio-updatescript.patch
@@ -0,0 +1,449 @@
+From 2c8f7755d40dd1a77f99d766e1d23a3d4ddf67a1 Mon Sep 17 00:00:00 2001
+From: Luke Granger-Brown <git@lukegb.com>
+Date: Sat, 28 Nov 2020 22:52:07 +0000
+Subject: [PATCH 1/2] factorio: add an updateScript
+
+The updateScript knows how to automatically fetch and update the version
+data from the Factorio versions API (and update the hashes
+appropriately), which makes it easier to update whenever experimental
+does.
+---
+ pkgs/games/factorio/default.nix   | 120 ++++++++++-----------
+ pkgs/games/factorio/update.py     | 174 ++++++++++++++++++++++++++++++
+ pkgs/games/factorio/versions.json |  58 ++++++++++
+ 3 files changed, 286 insertions(+), 66 deletions(-)
+ create mode 100755 pkgs/games/factorio/update.py
+ create mode 100644 pkgs/games/factorio/versions.json
+
+diff --git a/pkgs/games/factorio/default.nix b/pkgs/games/factorio/default.nix
+index f5f12b47dd72d..14e00380e8751 100644
+--- a/pkgs/games/factorio/default.nix
++++ b/pkgs/games/factorio/default.nix
+@@ -13,6 +13,8 @@ assert releaseType == "alpha"
+ 
+ let
+ 
++  inherit (stdenv.lib) importJSON;
++
+   helpMsg = ''
+ 
+     ===FETCH FAILED===
+@@ -59,72 +61,54 @@ let
+ 
+   # NB `experimental` directs us to take the latest build, regardless of its branch;
+   # hence the (stable, experimental) pairs may sometimes refer to the same distributable.
+-  binDists = {
+-    x86_64-linux = let bdist = bdistForArch { inUrl = "linux64"; inTar = "x64"; }; in {
+-      alpha = {
+-        stable        = bdist { sha256 = "0zixscff0svpb0yg8nzczp2z4filqqxi1k0z0nrpzn2hhzhf1464"; version = "1.0.0"; withAuth = true; };
+-        experimental  = bdist { sha256 = "0cmia16d5dhy3f8mck926d7rrnavxmvb6a72ymjllxm37slsx60j"; version = "1.1.2"; withAuth = true; };
+-      };
+-      headless = {
+-        stable        = bdist { sha256 = "0r0lplns8nxna2viv8qyx9mp4cckdvx6k20w2g2fwnj3jjmf3nc1"; version = "1.0.0"; };
+-        experimental  = bdist { sha256 = "0x3lwz11z8cczqr5i799m4yg8x3yk6h5qz48pfzw4l2ikrrwgahd"; version = "1.1.2"; };
+-      };
+-      demo = {
+-        stable        = bdist { sha256 = "0h9cqbp143w47zcl4qg4skns4cngq0k40s5jwbk0wi5asjz8whqn"; version = "1.0.0"; };
+-      };
+-    };
+-    i686-linux = let bdist = bdistForArch { inUrl = "linux32"; inTar = "i386"; }; in {
+-      alpha = {
+-        stable        = bdist { sha256 = "0nnfkxxqnywx1z05xnndgh71gp4izmwdk026nnjih74m2k5j086l"; version = "0.14.23"; withAuth = true; nameMut = asGz; };
+-      };
+-    };
+-  };
++  versions = importJSON ./versions.json;
++  binDists = makeBinDists versions;
+ 
+   actual = binDists.${stdenv.hostPlatform.system}.${releaseType}.${branch} or (throw "Factorio ${releaseType}-${branch} binaries for ${stdenv.hostPlatform.system} are not available for download.");
+ 
+-  bdistForArch = arch: { version
+-                       , sha256
+-                       , withAuth ? false
+-                       , nameMut ? x: x
+-                       }:
+-    let
+-      url = "https://factorio.com/get-download/${version}/${releaseType}/${arch.inUrl}";
+-      name = nameMut "factorio_${releaseType}_${arch.inTar}-${version}.tar.xz";
+-    in {
+-      inherit version arch;
+-      src =
+-        if withAuth then
+-          (stdenv.lib.overrideDerivation
+-            (fetchurl {
+-              inherit name url sha256;
+-              curlOpts = [
+-                "--get"
+-                "--data-urlencode" "username@username"
+-                "--data-urlencode" "token@token"
+-              ];
+-            })
+-            (_: { # This preHook hides the credentials from /proc
+-                  preHook =
+-                    if username != "" && token != "" then ''
+-                      echo -n "${username}" >username
+-                      echo -n "${token}"    >token
+-                    '' else ''
+-                      # Deliberately failing since username/token was not provided, so we can't fetch.
+-                      # We can't use builtins.throw since we want the result to be used if the tar is in the store already.
+-                      exit 1
+-                    '';
+-                  failureHook = ''
+-                    cat <<EOF
+-                    ${helpMsg}
+-                    EOF
+-                  '';
+-            })
+-          )
++  makeBinDists = versions:
++    let f = path: name: value:
++      if builtins.isAttrs value then
++        if value ? "name" then
++          makeBinDist value
+         else
+-          fetchurl { inherit name url sha256; };
+-    };
+-
+-  asGz = builtins.replaceStrings [".xz"] [".gz"];
++          builtins.mapAttrs (f (path ++ [ name ])) value
++      else
++        throw "expected attrset at ${toString path} - got ${toString value}";
++    in
++      builtins.mapAttrs (f []) versions;
++  makeBinDist = { name, version, tarDirectory, url, sha256, needsAuth }: {
++    inherit version tarDirectory;
++    src =
++      if !needsAuth then
++        fetchurl { inherit name url sha256; }
++      else
++        (stdenv.lib.overrideDerivation
++          (fetchurl {
++            inherit name url sha256;
++            curlOpts = [
++              "--get"
++              "--data-urlencode" "username@username"
++              "--data-urlencode" "token@token"
++            ];
++          })
++          (_: { # This preHook hides the credentials from /proc
++                preHook =
++                  if username != "" && token != "" then ''
++                    echo -n "${username}" >username
++                    echo -n "${token}"    >token
++                  '' else ''
++                    # Deliberately failing since username/token was not provided, so we can't fetch.
++                    # We can't use builtins.throw since we want the result to be used if the tar is in the store already.
++                    exit 1
++                  '';
++                failureHook = ''
++                  cat <<EOF
++                  ${helpMsg}
++                  EOF
++                '';
++              }));
++  };
+ 
+   configBaseCfg = ''
+     use-system-read-write-data-directories=false
+@@ -159,12 +143,16 @@ let
+     installPhase = ''
+       mkdir -p $out/{bin,share/factorio}
+       cp -a data $out/share/factorio
+-      cp -a bin/${arch.inTar}/factorio $out/bin/factorio
++      cp -a bin/${tarDirectory}/factorio $out/bin/factorio
+       patchelf \
+         --set-interpreter $(cat $NIX_CC/nix-support/dynamic-linker) \
+         $out/bin/factorio
+     '';
+ 
++    passthru.updateScript = if (username != "" && token != "") then [
++      ./update.py "--username=${username}" "--token=${token}"
++    ] else null;
++
+     meta = {
+       description = "A game in which you build and maintain factories";
+       longDescription = ''
+@@ -176,13 +164,13 @@ let
+         ingenious structures, apply management skills to keep it working and
+         finally protect it from the creatures who don't really like you.
+ 
+-        Factorio has been in development since spring of 2012 and it is
+-        currently in late alpha.
++        Factorio has been in development since spring of 2012, and reached
++        version 1.0 in mid 2020.
+       '';
+       homepage = "https://www.factorio.com/";
+       license = stdenv.lib.licenses.unfree;
+       maintainers = with stdenv.lib.maintainers; [ Baughn elitak erictapen priegger ];
+-      platforms = [ "i686-linux" "x86_64-linux" ];
++      platforms = [ "x86_64-linux" ];
+     };
+   };
+ 
+diff --git a/pkgs/games/factorio/update.py b/pkgs/games/factorio/update.py
+new file mode 100755
+index 0000000000000..b1cdce6b4aa1c
+--- /dev/null
++++ b/pkgs/games/factorio/update.py
+@@ -0,0 +1,174 @@
++#!/usr/bin/env nix-shell
++#! nix-shell -i python -p "python3.withPackages (ps: with ps; [ ps.absl-py ps.requests ])" nix
++
++from collections import defaultdict
++import copy
++from dataclasses import dataclass
++import json
++import os.path
++import subprocess
++from typing import Callable, Dict
++
++from absl import app
++from absl import flags
++from absl import logging
++import requests
++
++
++FACTORIO_API = "https://factorio.com/api/latest-releases"
++
++
++FLAGS = flags.FLAGS
++
++flags.DEFINE_string('username', '', 'Factorio username for retrieving binaries.')
++flags.DEFINE_string('token', '', 'Factorio token for retrieving binaries.')
++flags.DEFINE_string('out', '', 'Output path for versions.json.')
++
++
++@dataclass
++class System:
++    nix_name: str
++    url_name: str
++    tar_name: str
++
++
++@dataclass
++class ReleaseType:
++    name: str
++    needs_auth: bool = False
++
++
++@dataclass
++class ReleaseChannel:
++    name: str
++
++
++FactorioVersionsJSON = Dict[str, Dict[str, str]]
++OurVersionJSON = Dict[str, Dict[str, Dict[str, Dict[str, str]]]]
++
++
++SYSTEMS = [
++    System(nix_name="x86_64-linux", url_name="linux64", tar_name="x64"),
++]
++
++RELEASE_TYPES = [
++    ReleaseType("alpha", needs_auth=True),
++    ReleaseType("demo"),
++    ReleaseType("headless"),
++]
++
++RELEASE_CHANNELS = [
++    ReleaseChannel("experimental"),
++    ReleaseChannel("stable"),
++]
++
++
++def find_versions_json() -> str:
++    if FLAGS.out:
++        return out
++    try_paths = ["pkgs/games/factorio/versions.json", "versions.json"]
++    for path in try_paths:
++        if os.path.exists(path):
++            return path
++    raise Exception("Couldn't figure out where to write versions.json; try specifying --out")
++
++
++def fetch_versions() -> FactorioVersionsJSON:
++    return json.loads(requests.get("https://factorio.com/api/latest-releases").text)
++
++
++def generate_our_versions(factorio_versions: FactorioVersionsJSON) -> OurVersionJSON:
++    rec_dd = lambda: defaultdict(rec_dd)
++    output = rec_dd()
++    for system in SYSTEMS:
++        for release_type in RELEASE_TYPES:
++            for release_channel in RELEASE_CHANNELS:
++                version = factorio_versions[release_channel.name][release_type.name]
++                this_release = {
++                    "name":         f"factorio_{release_type.name}_{system.tar_name}-{version}.tar.xz",
++                    "url":          f"https://factorio.com/get-download/{version}/{release_type.name}/{system.url_name}",
++                    "version":      version,
++                    "needsAuth":    release_type.needs_auth,
++                    "tarDirectory": system.tar_name,
++                }
++                output[system.nix_name][release_type.name][release_channel.name] = this_release
++    return output
++
++
++def iter_version(versions: OurVersionJSON, it: Callable[[str, str, str, Dict[str, str]], Dict[str, str]]) -> OurVersionJSON:
++    versions = copy.deepcopy(versions)
++    for system_name, system in versions.items():
++        for release_type_name, release_type in system.items():
++            for release_channel_name, release in release_type.items():
++                release_type[release_channel_name] = it(system_name, release_type_name, release_channel_name, dict(release))
++    return versions
++
++
++def merge_versions(old: OurVersionJSON, new: OurVersionJSON) -> OurVersionJSON:
++    """Copies already-known hashes from version.json to avoid having to re-fetch."""
++    def _merge_version(system_name: str, release_type_name: str, release_channel_name: str, release: Dict[str, str]) -> Dict[str, str]:
++        old_system = old.get(system_name, {})
++        old_release_type = old_system.get(release_type_name, {})
++        old_release = old_release_type.get(release_channel_name, {})
++        if not "sha256" in old_release:
++            logging.info("%s/%s/%s: not copying sha256 since it's missing", system_name, release_type_name, release_channel_name)
++            return release
++        if not all(old_release.get(k, None) == release[k] for k in ['name', 'version', 'url']):
++            logging.info("%s/%s/%s: not copying sha256 due to mismatch", system_name, release_type_name, release_channel_name)
++            return release
++        release["sha256"] = old_release["sha256"]
++        return release
++    return iter_version(new, _merge_version)
++
++
++def nix_prefetch_url(name: str, url: str, algo: str = 'sha256') -> str:
++    cmd = ['nix-prefetch-url', '--type', algo, '--name', name, url]
++    logging.info('running %s', cmd)
++    out = subprocess.check_output(cmd)
++    return out.decode('utf-8').strip()
++
++
++def fill_in_hash(versions: OurVersionJSON) -> OurVersionJSON:
++    """Fill in sha256 hashes for anything missing them."""
++    urls_to_hash = {}
++    def _fill_in_hash(system_name: str, release_type_name: str, release_channel_name: str, release: Dict[str, str]) -> Dict[str, str]:
++        if "sha256" in release:
++            logging.info("%s/%s/%s: skipping fetch, sha256 already present", system_name, release_type_name, release_channel_name)
++            return release
++        url = release["url"]
++        if url in urls_to_hash:
++            logging.info("%s/%s/%s: found url %s in cache", system_name, release_type_name, release_channel_name, url)
++            release["sha256"] = urls_to_hash[url]
++            return release
++        logging.info("%s/%s/%s: fetching %s", system_name, release_type_name, release_channel_name, url)
++        if release["needsAuth"]:
++            if not FLAGS.username or not FLAGS.token:
++                raise Exception("fetching %s/%s/%s from %s requires --username and --token" % (system_name, release_type_name, release_channel_name, url))
++            url += f"?username={FLAGS.username}&token={FLAGS.token}"
++        release["sha256"] = nix_prefetch_url(release["name"], url)
++        urls_to_hash[url] = release["sha256"]
++        return release
++    return iter_version(versions, _fill_in_hash)
++
++
++def main(argv):
++    factorio_versions = fetch_versions()
++    new_our_versions = generate_our_versions(factorio_versions)
++    old_our_versions = None
++    our_versions_path = find_versions_json()
++    if our_versions_path:
++        logging.info('Loading old versions.json from %s', our_versions_path)
++        with open(our_versions_path, 'r') as f:
++            old_our_versions = json.load(f)
++    if old_our_versions:
++        logging.info('Merging in old hashes')
++        new_our_versions = merge_versions(old_our_versions, new_our_versions)
++    logging.info('Fetching necessary tars to get hashes')
++    new_our_versions = fill_in_hash(new_our_versions)
++    with open(our_versions_path, 'w') as f:
++        logging.info('Writing versions.json to %s', our_versions_path)
++        json.dump(new_our_versions, f, sort_keys=True, indent=2)
++        f.write("\n")
++
++if __name__ == '__main__':
++    app.run(main)
+diff --git a/pkgs/games/factorio/versions.json b/pkgs/games/factorio/versions.json
+new file mode 100644
+index 0000000000000..82ab40ec3cbe5
+--- /dev/null
++++ b/pkgs/games/factorio/versions.json
+@@ -0,0 +1,58 @@
++{
++  "x86_64-linux": {
++    "alpha": {
++      "experimental": {
++        "name": "factorio_alpha_x64-1.1.2.tar.xz",
++        "needsAuth": true,
++        "sha256": "0cmia16d5dhy3f8mck926d7rrnavxmvb6a72ymjllxm37slsx60j",
++        "tarDirectory": "x64",
++        "url": "https://factorio.com/get-download/1.1.2/alpha/linux64",
++        "version": "1.1.2"
++      },
++      "stable": {
++        "name": "factorio_alpha_x64-1.0.0.tar.xz",
++        "needsAuth": true,
++        "sha256": "0zixscff0svpb0yg8nzczp2z4filqqxi1k0z0nrpzn2hhzhf1464",
++        "tarDirectory": "x64",
++        "url": "https://factorio.com/get-download/1.0.0/alpha/linux64",
++        "version": "1.0.0"
++      }
++    },
++    "demo": {
++      "experimental": {
++        "name": "factorio_demo_x64-1.0.0.tar.xz",
++        "needsAuth": false,
++        "sha256": "0h9cqbp143w47zcl4qg4skns4cngq0k40s5jwbk0wi5asjz8whqn",
++        "tarDirectory": "x64",
++        "url": "https://factorio.com/get-download/1.0.0/demo/linux64",
++        "version": "1.0.0"
++      },
++      "stable": {
++        "name": "factorio_demo_x64-1.0.0.tar.xz",
++        "needsAuth": false,
++        "sha256": "0h9cqbp143w47zcl4qg4skns4cngq0k40s5jwbk0wi5asjz8whqn",
++        "tarDirectory": "x64",
++        "url": "https://factorio.com/get-download/1.0.0/demo/linux64",
++        "version": "1.0.0"
++      }
++    },
++    "headless": {
++      "experimental": {
++        "name": "factorio_headless_x64-1.1.2.tar.xz",
++        "needsAuth": false,
++        "sha256": "0x3lwz11z8cczqr5i799m4yg8x3yk6h5qz48pfzw4l2ikrrwgahd",
++        "tarDirectory": "x64",
++        "url": "https://factorio.com/get-download/1.1.2/headless/linux64",
++        "version": "1.1.2"
++      },
++      "stable": {
++        "name": "factorio_headless_x64-1.0.0.tar.xz",
++        "needsAuth": false,
++        "sha256": "0r0lplns8nxna2viv8qyx9mp4cckdvx6k20w2g2fwnj3jjmf3nc1",
++        "tarDirectory": "x64",
++        "url": "https://factorio.com/get-download/1.0.0/headless/linux64",
++        "version": "1.0.0"
++      }
++    }
++  }
++}
+
+From 8a63eaab52abc1ffe065f0c9f93eeedaae7a487b Mon Sep 17 00:00:00 2001
+From: Luke Granger-Brown <git@lukegb.com>
+Date: Sat, 28 Nov 2020 22:53:22 +0000
+Subject: [PATCH 2/2] factorio: add lukegb as maintainer
+
+---
+ pkgs/games/factorio/default.nix | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/pkgs/games/factorio/default.nix b/pkgs/games/factorio/default.nix
+index 14e00380e8751..4535f31f26237 100644
+--- a/pkgs/games/factorio/default.nix
++++ b/pkgs/games/factorio/default.nix
+@@ -169,7 +169,7 @@ let
+       '';
+       homepage = "https://www.factorio.com/";
+       license = stdenv.lib.licenses.unfree;
+-      maintainers = with stdenv.lib.maintainers; [ Baughn elitak erictapen priegger ];
++      maintainers = with stdenv.lib.maintainers; [ Baughn elitak erictapen priegger lukegb ];
+       platforms = [ "x86_64-linux" ];
+     };
+   };
diff --git a/third_party/nixpkgs/patches/pr105471-factorio-bump-1.1.3.patch b/third_party/nixpkgs/patches/pr105471-factorio-bump-1.1.3.patch
new file mode 100644
index 0000000000..3fa2099a06
--- /dev/null
+++ b/third_party/nixpkgs/patches/pr105471-factorio-bump-1.1.3.patch
@@ -0,0 +1,48 @@
+From e555cb3a33b778227c60587eb66c538403bf9cf9 Mon Sep 17 00:00:00 2001
+From: Luke Granger-Brown <git@lukegb.com>
+Date: Mon, 30 Nov 2020 18:03:14 +0000
+Subject: [PATCH] factorio-experimental, factorio-headless-experimental: 1.1.2
+ -> 1.1.3
+
+---
+ pkgs/games/factorio/versions.json | 16 ++++++++--------
+ 1 file changed, 8 insertions(+), 8 deletions(-)
+
+diff --git a/pkgs/games/factorio/versions.json b/pkgs/games/factorio/versions.json
+index 82ab40ec3cbe5..a76f5abc14750 100644
+--- a/pkgs/games/factorio/versions.json
++++ b/pkgs/games/factorio/versions.json
+@@ -2,12 +2,12 @@
+   "x86_64-linux": {
+     "alpha": {
+       "experimental": {
+-        "name": "factorio_alpha_x64-1.1.2.tar.xz",
++        "name": "factorio_alpha_x64-1.1.3.tar.xz",
+         "needsAuth": true,
+-        "sha256": "0cmia16d5dhy3f8mck926d7rrnavxmvb6a72ymjllxm37slsx60j",
++        "sha256": "0lsgj7361bf9zhidp4hpdhb9jj7wgcw7s0q5bpqbigbnz848m3lm",
+         "tarDirectory": "x64",
+-        "url": "https://factorio.com/get-download/1.1.2/alpha/linux64",
+-        "version": "1.1.2"
++        "url": "https://factorio.com/get-download/1.1.3/alpha/linux64",
++        "version": "1.1.3"
+       },
+       "stable": {
+         "name": "factorio_alpha_x64-1.0.0.tar.xz",
+@@ -38,12 +38,12 @@
+     },
+     "headless": {
+       "experimental": {
+-        "name": "factorio_headless_x64-1.1.2.tar.xz",
++        "name": "factorio_headless_x64-1.1.3.tar.xz",
+         "needsAuth": false,
+-        "sha256": "0x3lwz11z8cczqr5i799m4yg8x3yk6h5qz48pfzw4l2ikrrwgahd",
++        "sha256": "1164hbbd1b33hjnvjm079czjypj837gpjp2i4f23rkd4qmjpl0dj",
+         "tarDirectory": "x64",
+-        "url": "https://factorio.com/get-download/1.1.2/headless/linux64",
+-        "version": "1.1.2"
++        "url": "https://factorio.com/get-download/1.1.3/headless/linux64",
++        "version": "1.1.3"
+       },
+       "stable": {
+         "name": "factorio_headless_x64-1.0.0.tar.xz",
diff --git a/third_party/nixpkgs/patches/series b/third_party/nixpkgs/patches/series
index e313c2530e..25dc8039bf 100644
--- a/third_party/nixpkgs/patches/series
+++ b/third_party/nixpkgs/patches/series
@@ -2,3 +2,5 @@ pr102855-zram-allow-memorymax.patch
 pr103084-teamspeak3-bump-3.5.6.patch
 pr104891-factorio-bump-1.1.1.patch
 pr105231-factorio-bump-1.1.2.patch
+pr105296-factorio-updatescript.patch
+pr105471-factorio-bump-1.1.3.patch