diff --git a/pkgs/by-name/ol/olympus-with-steam-run/package.nix b/pkgs/by-name/ol/olympus-with-steam-run/package.nix
new file mode 100644
index 00000000000000..8d5d4b50599426
--- /dev/null
+++ b/pkgs/by-name/ol/olympus-with-steam-run/package.nix
@@ -0,0 +1,6 @@
+{
+  steam-run,
+  callPackage,
+}:
+
+callPackage ../olympus/package.nix { celesteWrapper = steam-run; }
diff --git a/pkgs/by-name/ol/olympus/deps.nix b/pkgs/by-name/ol/olympus/deps.nix
index 82da86b0514d7b..6824f40b6fd260 100644
--- a/pkgs/by-name/ol/olympus/deps.nix
+++ b/pkgs/by-name/ol/olympus/deps.nix
@@ -5,47 +5,47 @@
 [
   (fetchNuGet {
     pname = "Microsoft.NETFramework.ReferenceAssemblies";
-    version = "1.0.2";
-    sha256 = "0i42rn8xmvhn08799manpym06kpw89qy9080myyy2ngy565pqh0a";
+    version = "1.0.3";
+    hash = "sha256-FBoJP5DHZF0QHM0xLm9yd4HJZVQOuSpSKA+VQRpphEE=";
   })
   (fetchNuGet {
     pname = "Microsoft.NETFramework.ReferenceAssemblies.net452";
-    version = "1.0.2";
-    sha256 = "02xpdaynfglblvi2brszspvz0rz3admzh35shnqgik6s1x75n82k";
+    version = "1.0.3";
+    hash = "sha256-RTPuFG8D7gnwINEoEtAqmVm4oTW8K4Z87v1o4DDeLMI=";
   })
   (fetchNuGet {
     pname = "Mono.Cecil";
     version = "0.11.4";
-    sha256 = "1yxa7mh432s7g7p9r7scqxvxjk5ypwc567qdbf0gmk8fbf0d3f8y";
+    hash = "sha256-HrnRgFsOzfqAWw0fUxi/vkzZd8dMn5zueUeLQWA9qvs=";
   })
   (fetchNuGet {
     pname = "MonoMod";
     version = "22.1.4.3";
-    sha256 = "1bxrqflqfj6ck1mk9mq41iv2ayz1idirxi4vlan1b30ljq7xsacj";
+    hash = "sha256-kindD5YUjBWsopvEnmOL4XsldgwE1zRrmMxIh6nDua8=";
   })
   (fetchNuGet {
     pname = "MonoMod.RuntimeDetour";
     version = "22.1.4.3";
-    sha256 = "0brf5835psbi4i0bhvgacpg5cgq9ln89ffz73a8q24wc47flvccv";
+    hash = "sha256-m7FN3SGME4GRGuc7l5ClCT9W3mXqbbhAJHHpWwYqLi8=";
   })
   (fetchNuGet {
     pname = "MonoMod.RuntimeDetour.HookGen";
     version = "22.1.4.3";
-    sha256 = "0km4g8wlfcsrr9lj6sz06dcsm60x8npdwv1fzzcssjqwfjwsgqqf";
+    hash = "sha256-DuOnuXQcS63Z/y5s3q5FHZiqWTPgayNpylkzRzl6pE4=";
   })
   (fetchNuGet {
     pname = "MonoMod.Utils";
     version = "22.1.4.3";
-    sha256 = "1m9wcmg2x85f2bji1gzgynn71x0nc9z8g04zryz6w2w26fismb6h";
+    hash = "sha256-0KyqozOCC26+z5+Ah35iFvRwrPXvvxDlEq6gLl5lPNU=";
   })
   (fetchNuGet {
     pname = "Newtonsoft.Json";
     version = "13.0.1";
-    sha256 = "0fijg0w6iwap8gvzyjnndds0q4b8anwxxvik7y8vgq97dram4srb";
+    hash = "sha256-K2tSVW4n4beRPzPu3rlVaBEMdGvWSv/3Q1fxaDh4Mjo=";
   })
   (fetchNuGet {
     pname = "YamlDotNet";
     version = "9.1.0";
-    sha256 = "0fcnw8plp1fl8nx5ykfbwq3qlsjpjzk65hfafj9dzj0vp4w0zcsr";
+    hash = "sha256-WbMPOLkbyN+SdMrBYuaXV2qKB+bLTV+6RdSFSy/iljk=";
   })
 ]
diff --git a/pkgs/by-name/ol/olympus/package.nix b/pkgs/by-name/ol/olympus/package.nix
index 060e8e66860a55..0fcd1e2fa8cafc 100644
--- a/pkgs/by-name/ol/olympus/package.nix
+++ b/pkgs/by-name/ol/olympus/package.nix
@@ -2,42 +2,58 @@
   lib,
   fetchFromGitHub,
   fetchzip,
+  buildFHSEnv,
   buildDotnetModule,
-  mono4,
-  love,
-  lua51Packages,
-  msbuild,
+  luajitPackages,
   sqlite,
-  curl,
   libarchive,
-  buildFHSEnv,
+  curl,
+  mono,
+  love,
   xdg-utils,
+  # Some examples for celesteWrapper:
+  # - null or "": Do not use wrapper.
+  # - steam-run: Use steam-run.
+  # - "steam-run": Use steam-run command available from PATH.
+  # - buildFHSEnv { ... }: Use a custom FHS env.
+  # - writeShellScriptBin { ... }: Use a custom script.
+  # - ./my-wrapper.sh: Use a custom script.
+  # In any case, it can be overridden at runtime by OLYMPUS_CELESTE_WRAPPER.
+  celesteWrapper ? null,
 }:
-# WONTFIX: On NixOS, cannot launch Steam installations of Everest / Celeste from Olympus.
-# The way it launches Celeste is by directly executing steamapps/common/Celeste/Celeste,
-# and it does not work on NixOS (even with steam-run).
-# This should be considered a bug of Steam on NixOS (and is probably very hard to fix).
-# https://github.com/EverestAPI/Olympus/issues/94 could be a temporary fix
-
-# FIXME: olympus checks if xdg-mime x-scheme-handler/everest for a popup. If it's not set it complains about it.
-# I'm pretty sure thats by user so end user needs to do it
 
 let
-  lua-subprocess = lua51Packages.buildLuarocksPackage {
-    pname = "subprocess";
-    version = "bfa8e9";
-    src = fetchFromGitHub {
-      owner = "0x0ade"; # a developer of Everest
-      repo = "lua-subprocess";
-      rev = "bfa8e97da774141f301cfd1106dca53a30a4de54";
-      hash = "sha256-4LiYWB3PAQ/s33Yj/gwC+Ef1vGe5FedWexeCBVSDIV0=";
-    };
-    rockspecFilename = "subprocess-scm-1.rockspec";
-  };
+  lua_cpath =
+    with luajitPackages;
+    lib.concatMapStringsSep ";" getLuaCPath [
+      (buildLuarocksPackage {
+        pname = "subprocess";
+        version = "bfa8e9";
+        src = fetchFromGitHub {
+          owner = "0x0ade"; # a developer of Everest
+          repo = "lua-subprocess";
+          rev = "bfa8e97da774141f301cfd1106dca53a30a4de54";
+          hash = "sha256-4LiYWB3PAQ/s33Yj/gwC+Ef1vGe5FedWexeCBVSDIV0=";
+        };
+        rockspecFilename = "subprocess-scm-1.rockspec";
+      })
+
+      (buildLuarocksPackage {
+        pname = "lsqlite3";
+        version = "0.9.6-1";
+        src = fetchzip {
+          url = "http://lua.sqlite.org/index.cgi/zip/lsqlite3_v096.zip";
+          hash = "sha256-Mq409A3X9/OS7IPI/KlULR6ZihqnYKk/mS/W/2yrGBg=";
+        };
+        buildInputs = [ sqlite.dev ];
+      })
+
+      nfd
+    ];
 
-  # NOTE: on installation olympus uses MiniInstallerLinux which is dynamically linked, this makes it run fine
-  fhs-env = buildFHSEnv {
-    name = "olympus-fhs";
+  # When installing Everest, Olympus uses MiniInstaller, which is dynamically linked.
+  miniinstaller-fhs = buildFHSEnv {
+    name = "olympus-miniinstaller-fhs";
     targetPkgs =
       pkgs:
       (with pkgs; [
@@ -45,120 +61,103 @@ let
         stdenv.cc.cc
         libgcc.lib
         openssl
+        dotnet-runtime # Without this, MiniInstaller will install dotnet itself.
       ]);
     runScript = "bash";
   };
+  miniinstaller-wrapper = "${miniinstaller-fhs}/bin/${miniinstaller-fhs.name}";
 
-  lsqlite3 = lua51Packages.buildLuarocksPackage {
-    pname = "lsqlite3";
-    version = "0.9.6-1";
-    src = fetchzip {
-      url = "http://lua.sqlite.org/index.cgi/zip/lsqlite3_v096.zip";
-      hash = "sha256-Mq409A3X9/OS7IPI/KlULR6ZihqnYKk/mS/W/2yrGBg=";
-    };
-    buildInputs = [ sqlite.dev ];
-  };
+  celeste-wrapper =
+    if lib.isDerivation celesteWrapper then
+      lib.getExe celesteWrapper
+    else if celesteWrapper == null then
+      ""
+    else
+      celesteWrapper;
 
-  dotnet-out = "sharp/bin/Release/net452";
   pname = "olympus";
   phome = "$out/lib/${pname}";
-  nfd = lua51Packages.nfd;
+  # The following variables are to be updated by the update script.
+  version = "24.11.23.01";
+  buildId = "4418"; # IMPORTANT: This line is matched with regex in update.sh.
+  rev = "d05f50fae23d741c9b6f72ba8fd951dca1a6e0f0";
 in
-buildDotnetModule rec {
-  inherit pname;
-
-  # FIXME: I made up this version number.
-  version = "24.07.06.02";
+buildDotnetModule {
+  inherit pname version;
 
   src = fetchFromGitHub {
+    inherit rev;
     owner = "EverestAPI";
     repo = "Olympus";
-    rev = "5f3e40687eb825c57021f52d83a3bc9a82c04bdb";
     fetchSubmodules = true; # Required. See upstream's README.
-    hash = "sha256-rNh6sH51poahiV0Mb61lHfzqOkPF2pW2wr7MOrfVSVs=";
+    hash = "sha256-SjSdcYAO6Do+OkHPMut+V7VwqBBFIkeHl8gjDIwocc0=";
   };
 
-  executables = [ ];
-
   nativeBuildInputs = [
-    msbuild
-    libarchive # To create the .love file (zip format)
-  ];
-
-  buildInputs = [
-    love
-    mono4
-    nfd
-    lua-subprocess
-    lsqlite3
-  ];
-
-  runtimeInputs = [
-    xdg-utils
+    libarchive # To create the .love file (zip format).
   ];
 
   nugetDeps = ./deps.nix;
+  projectFile = "sharp/Olympus.Sharp.csproj";
+  executables = [ ];
 
-  projectFile = "sharp/Olympus.Sharp.sln";
-
-  postConfigure = ''
-    echo '${version}-nixos' > src/version.txt
-  '';
-
-  # TODO: the override is needed for it to run. Should be found out why
-  # Copied from `olympus` in AUR.
-  buildPhase = ''
-    runHook preBuild
-    FrameworkPathOverride=${mono4.out}/lib/mono/4.5 msbuild ${projectFile} /p:Configuration=Release
-    runHook postBuild
+  # See the 'Dist: Update src/version.txt' step in azure-pipelines.yml from upstream.
+  preConfigure = ''
+    echo ${version}-nixos-${buildId}-${builtins.substring 0 5 rev} > src/version.txt
   '';
 
   # Hack Olympus.Sharp.bin.{x86,x86_64} to use system mono.
-  # This was proposed by @0x0ade on discord.gg/celeste:
+  # This was proposed by @0x0ade on discord.gg/celeste.
   # https://discord.com/channels/403698615446536203/514006912115802113/827507533962149900
-  #
-  # I assume --fused is so saves are properly made (https://love2d.org/wiki/love.filesystem)
   postBuild = ''
-    makeWrapper ${mono4.out}/bin/mono ${dotnet-out}/Olympus.Sharp.bin.x86 \
+    dotnet_out=sharp/bin/Release/net452
+    dotnet_out=$dotnet_out/$(ls $dotnet_out)
+    makeWrapper ${lib.getExe mono} $dotnet_out/Olympus.Sharp.bin.x86 \
       --add-flags ${phome}/sharp/Olympus.Sharp.exe
-    cp ${dotnet-out}/Olympus.Sharp.bin.x86 ${dotnet-out}/Olympus.Sharp.bin.x86_64
+    cp $dotnet_out/Olympus.Sharp.bin.x86 $dotnet_out/Olympus.Sharp.bin.x86_64
   '';
 
   # The script find-love is hacked to use love from nixpkgs.
   # It is used to launch Loenn from Olympus.
-  installPhase =
-    let
-      subprocess-cpath = "${lua-subprocess.out}/lib/lua/5.1/?.so";
-      nfd-cpath = "${nfd.out}/lib/lua/5.1/?.so";
-      lsqlite3-cpath = "${lsqlite3.out}/lib/lua/5.1/?.so";
-    in
-    ''
-      runHook preInstall
-      mkdir -p $out/bin
-      makeWrapper ${love.out}/bin/love ${phome}/find-love \
-        --add-flags "--fused"
-      makeWrapper ${phome}/find-love $out/bin/olympus \
-        --prefix LUA_CPATH : "${nfd-cpath};${subprocess-cpath};${lsqlite3-cpath}" \
-        --prefix LD_LIBRARY_PATH : ${lib.makeLibraryPath [ curl ]} \
-        --add-flags "${phome}/olympus.love"
-      mkdir -p ${phome}
-      bsdtar --format zip --strip-components 1 -cf ${phome}/olympus.love src
-      install -Dm755 ${dotnet-out}/* -t ${phome}/sharp
-      runHook postInstall
-    '';
-
-  # we need to force olympus to use the fhs-env
+  # I assume --fused is so saves are properly made (https://love2d.org/wiki/love.filesystem).
+  preInstall = ''
+    mkdir -p ${phome}
+    makeWrapper ${lib.getExe love} ${phome}/find-love \
+      --add-flags "--fused"
+  '';
+
+  installPhase = ''
+    runHook preInstall
+
+    mkdir -p $out/bin
+    makeWrapper ${phome}/find-love $out/bin/olympus \
+      --prefix LUA_CPATH ";" "${lua_cpath}" \
+      --prefix LD_LIBRARY_PATH : "${lib.makeLibraryPath [ curl ]}" \
+      --suffix PATH : "${lib.makeBinPath [ xdg-utils ]}" \
+      --set-default OLYMPUS_MINIINSTALLER_WRAPPER "${miniinstaller-wrapper}" \
+      --set-default OLYMPUS_CELESTE_WRAPPER "${celeste-wrapper}" \
+      --add-flags ${phome}/olympus.love
+    bsdtar --format zip --strip-components 1 -cf ${phome}/olympus.love src
+
+    dotnet_out=sharp/bin/Release/net452
+    dotnet_out=$dotnet_out/$(ls $dotnet_out)
+    install -Dm755 $dotnet_out/* -t ${phome}/sharp
+
+    runHook postInstall
+  '';
+
   postInstall = ''
-    sed -i 's|^exec|& ${fhs-env}/bin/olympus-fhs|' $out/bin/olympus
     install -Dm644 lib-linux/olympus.desktop $out/share/applications/olympus.desktop
     install -Dm644 src/data/icon.png $out/share/icons/hicolor/128x128/apps/olympus.png
     install -Dm644 LICENSE $out/share/licenses/${pname}/LICENSE
   '';
 
+  passthru.updateScript = ./update.sh;
+
   meta = {
     description = "Cross-platform GUI Everest installer and Celeste mod manager";
     homepage = "https://github.com/EverestAPI/Olympus";
-    changelog = "https://github.com/EverestAPI/Olympus/blob/main/changelog.txt";
+    downloadPage = "https://everestapi.github.io/#olympus";
     license = lib.licenses.mit;
     maintainers = with lib.maintainers; [
       ulysseszhan
diff --git a/pkgs/by-name/ol/olympus/update.sh b/pkgs/by-name/ol/olympus/update.sh
new file mode 100755
index 00000000000000..365b6464c69a02
--- /dev/null
+++ b/pkgs/by-name/ol/olympus/update.sh
@@ -0,0 +1,33 @@
+#!/usr/bin/env nix-shell
+#!nix-shell -i bash -p curl jq common-updater-scripts nixfmt-rfc-style
+
+set -eu -o pipefail
+
+attr=olympus
+nix_file=$(nix-instantiate --eval --strict -A "$attr.meta.position" | sed -re 's/^"(.*):[0-9]+"$/\1/')
+
+api() {
+  curl -s "https://dev.azure.com/EverestAPI/Olympus/_apis/$1?api-version=7.1"
+}
+
+pipeline_id=$(api pipelines | jq -r '
+  .value
+  | map(select(.name == "EverestAPI.Olympus"))
+  | .[0].id
+')
+
+run_id=$(api pipelines/$pipeline_id/runs | jq -r '
+  .value
+  | map(select(.result == "succeeded"))
+  | max_by(.finishedDate)
+  | .id
+')
+sed -i 's|buildId\s*=\s*".*";|buildId = "'$run_id'";|' $nix_file
+
+run=$(api pipelines/$pipeline_id/runs/$run_id)
+commit=$(echo "$run" | jq -r '.resources.repositories.self.version')
+version=$(echo "$run" | jq -r '.name')
+update-source-version $attr $version --rev=$commit
+
+"$(nix-build --attr $attr.fetch-deps --no-out-link)"
+nixfmt $(dirname $nix_file)/deps.nix # NixOS/nixpkgs#358025