diff --git a/.github/workflows/node.js.yml b/.github/workflows/node.js.yml
index e029119d..f2ec0aec 100644
--- a/.github/workflows/node.js.yml
+++ b/.github/workflows/node.js.yml
@@ -13,9 +13,9 @@ jobs:
     strategy:
       matrix:
         # Supported versions are active lts and maintenance see https://nodejs.org/en/about/releases/
-        node-version: [20.x, 22.x]
+        node-version: [22.x, 24.x]
         # Supported versions are latest stable and one minor version before stable (even if from a previous major) 
-        factorio-version: [1.1.110, 2.0.47]
+        factorio-version: [1.1.110, 2.0.77, 2.1.8]
 
     steps:
     - uses: actions/checkout@v4
@@ -54,7 +54,7 @@ jobs:
     - uses: pnpm/action-setup@v4
     - uses: actions/setup-node@v4
       with:
-        node-version: 20.x
+        node-version: 24.x
     - run: pnpm i --no-frozen-lockfile
     - run: pnpm run lint
 
@@ -65,7 +65,7 @@ jobs:
     - uses: pnpm/action-setup@v4
     - uses: actions/setup-node@v4
       with:
-        node-version: 20.x
+        node-version: 24.x
     - run: pnpm i --no-frozen-lockfile
     - run: pnpm run build-mod
     # Upload build to artifacts
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index c6942d45..c2ebbb98 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -6,6 +6,10 @@ on:
     types:
       - released
 
+permissions:
+  id-token: write
+  contents: read
+
 jobs:
   npm:
     runs-on: ubuntu-latest
@@ -15,12 +19,10 @@ jobs:
       - uses: pnpm/action-setup@v4
       - uses: actions/setup-node@v4
         with:
-          node-version: 22.x
+          node-version: 24.x
           registry-url: https://registry.npmjs.org
       - run: pnpm install --no-frozen-lockfile
       - run: pnpm -r --filter='./{plugins,packages}/*' publish --no-git-checks
-        env:
-          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
       - uses: softprops/action-gh-release@v2
         with:
           files: pnpm-lock.yaml
@@ -33,7 +35,7 @@ jobs:
       - uses: pnpm/action-setup@v4
       - uses: actions/setup-node@v4
         with:
-          node-version: 22.x
+          node-version: 24.x
       - run: pnpm install --no-frozen-lockfile
       - run: pnpm -r --filter='./{plugins,packages}/*' run build-mod --output-dir ../../dist
       - run: node ./publish.js factorio ./dist
diff --git a/packages/ctl/src/commands_debug.ts b/packages/ctl/src/commands_debug.ts
index 66559bd1..af991afc 100644
--- a/packages/ctl/src/commands_debug.ts
+++ b/packages/ctl/src/commands_debug.ts
@@ -9,3 +9,23 @@ debugCommands.add(new lib.Command({
 		control.keepOpen = true;
 	},
 }));
+
+debugCommands.add(new lib.Command({
+	definition: [
+		"parse-exchange-string <exchange-string>",
+		"Parse and print the contents of an exchange string",
+		(yargs) => {
+			yargs.positional("exchange-string", { describe: "String to parse", type: "string" });
+			yargs.option("pretty", { alias: "p", type: "boolean", description: "Pretty output" });
+		}],
+	handler: async function(args: { exchangeString: string, pretty: boolean }, control: Control) {
+		const result = lib.readMapExchangeString(args.exchangeString);
+		if (args.pretty) {
+			// eslint-disable-next-line no-console
+			console.log(JSON.stringify(result, null, 2));
+		} else {
+			// eslint-disable-next-line no-console
+			console.log(JSON.stringify(result));
+		}
+	},
+}));
diff --git a/packages/host/lua/clusterio_lib/info.json b/packages/host/lua/clusterio_lib/info.json
index ed6dcfb8..aae5af7f 100644
--- a/packages/host/lua/clusterio_lib/info.json
+++ b/packages/host/lua/clusterio_lib/info.json
@@ -16,6 +16,10 @@
 		{
 			"version": "2.0.20",
 			"factorio_version": "2.0"
+		},
+		{
+			"version": "2.0.21",
+			"factorio_version": "2.1"
 		}
 	],
 	"title": "Clusterio Library (Alpha)",
diff --git a/packages/host/src/Host.ts b/packages/host/src/Host.ts
index 0985edfd..b99392dc 100644
--- a/packages/host/src/Host.ts
+++ b/packages/host/src/Host.ts
@@ -659,10 +659,8 @@ export default class Host extends lib.Link {
 		return await this.downloadMod(mod);
 	}
 
-	async fetchMods(mods: Iterable<lib.ModRecord>) {
-		// This is better than the previous hard coded names
-		// But it really shouldn't be a hard coded version either
-		const builtinModNames = lib.ModPack.getBuiltinModNames("2.0");
+	async fetchMods(mods: Iterable<lib.ModRecord>, factorioVersion: lib.PartialVersion) {
+		const builtinModNames = lib.ModPack.getBuiltinModNames(factorioVersion);
 		const modInfos: Promise<lib.ModInfo>[] = [];
 		for (const mod of mods) {
 			if (builtinModNames.includes(mod.name)) {
diff --git a/packages/host/src/Instance.ts b/packages/host/src/Instance.ts
index ac72da58..19f10032 100644
--- a/packages/host/src/Instance.ts
+++ b/packages/host/src/Instance.ts
@@ -797,9 +797,7 @@ end`.replace(/\r?\n/g, " ");
 		}
 		this.activeModPack = modPack;
 
-		// TODO validate factorioVersion
-
-		const mods = await this._host.fetchMods(modPack.mods.values());
+		const mods = await this._host.fetchMods(modPack.mods.values(), modPack.factorioVersion);
 
 		await fs.mkdir(this.path("mods"), { recursive: true });
 
diff --git a/packages/lib/src/factorio/exchange_string.ts b/packages/lib/src/factorio/exchange_string.ts
index 6f7e3380..04a7d333 100644
--- a/packages/lib/src/factorio/exchange_string.ts
+++ b/packages/lib/src/factorio/exchange_string.ts
@@ -5,6 +5,8 @@ class MapReaderState {
 	last_position = { x: 0, y: 0 };
 	/** True when a version greater than 2.0.0 is detected */
 	v2 = false;
+	/** True when a version greater than 2.1.0 is detected */
+	v2_1 = false;
 	constructor(
 		public buf: Buffer
 	) { }
@@ -262,7 +264,23 @@ function readEnemyEvolution(state: MapReaderState) {
 }
 
 function readEnemyExpansion(state: MapReaderState) {
-	return {
+	return state.v2_1 ? {
+		enabled: readOptional(state, readBool),
+		max_expansion_distance: readOptional(state, readUInt32),
+		min_expansion_distance: readOptional(state, readUInt32), // v2.1
+		friendly_base_influence_radius: readOptional(state, readUInt32),
+		enemy_building_influence_radius: readOptional(state, readUInt32),
+		building_coefficient: readOptional(state, readDouble),
+		other_base_coefficient: readOptional(state, readDouble),
+		neighbouring_chunk_coefficient: readOptional(state, readDouble),
+		neighbouring_base_chunk_coefficient: readOptional(state, readDouble),
+		max_colliding_tiles_coefficient: readOptional(state, readDouble),
+		settler_group_min_size: readOptional(state, readUInt32),
+		settler_group_max_size: readOptional(state, readUInt32),
+		evolution_group_size_factor: readOptional(state, readDouble), // v2.1
+		min_expansion_cooldown: readOptional(state, readUInt32),
+		max_expansion_cooldown: readOptional(state, readUInt32),
+	} : {
 		enabled: readOptional(state, readBool),
 		max_expansion_distance: readOptional(state, readUInt32),
 		friendly_base_influence_radius: readOptional(state, readUInt32),
@@ -355,17 +373,32 @@ function readAsteroids(state: MapReaderState) {
 }
 
 function readMapSettings(state: MapReaderState) {
-	return state.v2 ? {
-		pollution: readPollution(state),
-		steering: readSteering(state),
-		enemy_evolution: readEnemyEvolution(state),
-		enemy_expansion: readEnemyExpansion(state),
-		unit_group: readUnitGroup(state),
-		path_finder: readPathFinder(state),
-		max_failed_behavior_count: readUInt32(state),
-		difficulty_settings: readDifficultySettings(state),
-		asteroids: readAsteroids(state), // v2
-	} : {
+	if (state.v2_1) {
+		return {
+			pollution: readPollution(state),
+			// steering removed v2.1
+			enemy_evolution: readEnemyEvolution(state),
+			enemy_expansion: readEnemyExpansion(state),
+			unit_group: readUnitGroup(state),
+			path_finder: readPathFinder(state),
+			max_failed_behavior_count: readUInt32(state),
+			difficulty_settings: readDifficultySettings(state),
+			asteroids: readAsteroids(state), // v2
+		};
+	} else if (state.v2) {
+		return {
+			pollution: readPollution(state),
+			steering: readSteering(state),
+			enemy_evolution: readEnemyEvolution(state),
+			enemy_expansion: readEnemyExpansion(state),
+			unit_group: readUnitGroup(state),
+			path_finder: readPathFinder(state),
+			max_failed_behavior_count: readUInt32(state),
+			difficulty_settings: readDifficultySettings(state),
+			asteroids: readAsteroids(state), // v2
+		};
+	}
+	return {
 		pollution: readPollution(state),
 		steering: readSteering(state),
 		enemy_evolution: readEnemyEvolution(state),
@@ -427,6 +460,7 @@ export function readMapExchangeString(exchangeString: string) {
 	try {
 		const version = readVersion(state);
 		state.v2 = version[0] >= 2;
+		state.v2_1 = version[0] >= 2 && version[1] >= 1;
 		data = {
 			version: version,
 			unknown: readUInt8(state),
diff --git a/test/integration/clusterio.js b/test/integration/clusterio.js
index f1aa80c5..2729eb8a 100644
--- a/test/integration/clusterio.js
+++ b/test/integration/clusterio.js
@@ -1150,8 +1150,15 @@ describe("Integration of Clusterio", function() {
 				await execCtl("instance start 44");
 				const instance = (await getInstances()).get(44);
 				const isV2 = lib.integerPartialVersion(instance.factorioVersion) > lib.integerPartialVersion("2.0");
-				const exchangeString = (isV2 ? testStrings.modified_v2 : testStrings.modified).replace(/[\n\r]+/g, "");
-				const args = `base/freeplay --seed 1234 --map-exchange-string "${exchangeString}"`;
+				const isV2_1 = lib.integerPartialVersion(instance.factorioVersion) > lib.integerPartialVersion("2.1");
+				let exchangeString = testStrings.modified;
+				if (isV2_1) {
+					exchangeString = testStrings.modified_v2_1;
+				} else if (isV2) {
+					exchangeString = testStrings.modified_v2;
+				}
+				// eslint-disable-next-line max-len
+				const args = `base/freeplay --seed 1234 --map-exchange-string "${exchangeString.replace(/[\n\r]+/g, "")}"`;
 				await execCtl("instance stop 44");
 
 				await execCtl(`instance load-scenario test ${args}`);
diff --git a/test/integration/index.js b/test/integration/index.js
index c9ea3d97..4a529471 100644
--- a/test/integration/index.js
+++ b/test/integration/index.js
@@ -363,7 +363,11 @@ before(async function() {
 
 	controllerProcess = await spawnNode("controller:", "../../packages/controller run", /Started controller/);
 
-	haveFactorioInstall = (await _listFactorioVersions(factorioDir)).versions.size > 0;
+	const factorioVersions = (await _listFactorioVersions(factorioDir)).versions;
+	const latestFactorioVersion = [...factorioVersions.values()]
+		.sort((a, b) => lib.integerFullVersion(b) - lib.integerFullVersion(a))[0];
+	haveFactorioInstall = factorioVersions.size > 0;
+
 	const relativeFactorioDir = path.isAbsolute(factorioDir) ? factorioDir : path.join("..", "..", factorioDir);
 	await execCtlProcess("host create-config --id 4 --name host --generate-token");
 	await execHost(`config set host.factorio_directory ${relativeFactorioDir}`);
@@ -382,8 +386,11 @@ before(async function() {
 	const testPack = lib.ModPack.fromJSON({});
 	testPack.id = 12;
 	testPack.name = "subspace_storage-pack";
-	testPack.factorioVersion = "2.0.0";
-	testPack.mods.set("clusterio_lib", { name: "clusterio_lib", enabled: true, version: "2.0.20" });
+	testPack.factorioVersion = latestFactorioVersion;
+
+	const [major, minor] = lib.normaliseMajorMinorVersion(latestFactorioVersion).split(".");
+	testPack.mods.set("clusterio_lib", { name: "clusterio_lib", enabled: true, version: `2.0.${major}${minor}` });
+
 	await control.sendTo("controller", new lib.ModPackCreateRequest(testPack));
 	await control.sendTo(
 		"controller",
diff --git a/test/lib/factorio/exchange_string.js b/test/lib/factorio/exchange_string.js
index 08f92187..10d1421f 100644
--- a/test/lib/factorio/exchange_string.js
+++ b/test/lib/factorio/exchange_string.js
@@ -59,6 +59,16 @@ describe("lib/factorio/exchange_string", function() {
 			});
 		});
 
+		it("should parse post v2.1 strings", function() {
+			assert.deepEqual(lib.readMapExchangeString(testStrings.modified_v2_1), {
+				version: [2, 1, 9, 3],
+				unknown: 0,
+				map_gen_settings: testSettings.modified_v2_1_map_gen_settings,
+				map_settings: testSettings.modified_v2_1_map_settings,
+				checksum: 3180296799,
+			});
+		});
+
 		it("should handle malformed strings", function() {
 			assert.throws(
 				() => lib.readMapExchangeString("<<blah>>"),
diff --git a/test/lib/factorio/test_settings.js b/test/lib/factorio/test_settings.js
index 6795b99f..3c295c14 100644
--- a/test/lib/factorio/test_settings.js
+++ b/test/lib/factorio/test_settings.js
@@ -467,6 +467,154 @@ const modified_v2_map_settings = {
 	},
 };
 
+const modified_v2_1_map_gen_settings = {
+	"autoplace_controls": {
+		"coal": { "frequency": 1, "size": 1, "richness": 1 },
+		"copper-ore": { "frequency": 0.5, "size": 1, "richness": 1 },
+		"crude-oil": { "frequency": 0.5, "size": 1, "richness": 4 },
+		"enemy-base": { "frequency": 2, "size": 1.5, "richness": 1 },
+		"iron-ore": { "frequency": 1.5, "size": 1, "richness": 1 },
+		"nauvis_cliff": { "frequency": 1, "size": 1, "richness": 1 },
+		"rocks": { "frequency": 1, "size": 1, "richness": 1 },
+		"starting_area_moisture": { "frequency": 1, "size": 1, "richness": 1 },
+		"stone": { "frequency": 2, "size": 1, "richness": 1 },
+		"trees": { "frequency": 1.3333333730697632, "size": 0.3333333432674408, "richness": 1 },
+		"uranium-ore": { "frequency": 1, "size": 1.3333333730697632, "richness": 1 },
+		"water": { "frequency": 0.5, "size": 0.3333333432674408, "richness": 1 },
+	},
+	"autoplace_settings": {},
+	"default_enable_all_autoplace_controls": true,
+	"seed": 3378377395,
+	"width": 2000000,
+	"height": 2000000,
+	"area_to_generate_at_start": {
+		"left_top": { "x": -224, "y": -224 },
+		"right_bottom": { "x": 224, "y": 224 },
+		"orientation": { "x": 0, "y": -32767 },
+	},
+	"starting_area": 0.3333333432674408,
+	"peaceful_mode": false,
+	"no_enemies_mode": false,
+	"starting_points": [
+		{ "x": 0, "y": 0 },
+	],
+	"property_expression_names": {
+		"control:aux:bias": "-0.200000",
+		"control:aux:frequency": "2.000000",
+		"control:moisture:bias": "-0.200000",
+		"control:moisture:frequency": "0.333333",
+		"elevation": "elevation_lakes",
+	},
+	"cliff_settings": {
+		"name": "cliff",
+		"control": "",
+		"cliff_elevation_0": 10,
+		"cliff_elevation_interval": 40,
+		"richness": 1,
+		"cliff_smoothing": 1,
+	},
+	"territory_settings": null,
+};
+
+const modified_v2_1_map_settings = {
+	"pollution": {
+		"enabled": true,
+		"diffusion_ratio": 0.02,
+		"min_to_diffuse": 15,
+		"ageing": 1.5,
+		"expected_max_per_chunk": 150,
+		"min_to_show_per_chunk": 50,
+		"min_pollution_to_damage_trees": 3785,
+		"pollution_with_max_forest_damage": 150,
+		"pollution_per_tree_damage": 50,
+		"pollution_restored_per_tree_damage": 3714,
+		"max_pollution_to_restore_trees": 20,
+		"enemy_attack_pollution_consumption_modifier": 1,
+	},
+	"enemy_evolution": {
+		"enabled": true,
+		"time_factor": 0.00002,
+		"destroy_factor": 0.002,
+		"pollution_factor": 0.000012,
+	},
+	"enemy_expansion": {
+		"enabled": true,
+		"max_expansion_distance": 13,
+		"min_expansion_distance": 3,
+		"friendly_base_influence_radius": 6,
+		"enemy_building_influence_radius": 3,
+		"building_coefficient": 0.5,
+		"other_base_coefficient": 3,
+		"neighbouring_chunk_coefficient": 0.5,
+		"neighbouring_base_chunk_coefficient": 0.5,
+		"max_colliding_tiles_coefficient": 0.8,
+		"settler_group_min_size": 5,
+		"settler_group_max_size": 20,
+		"evolution_group_size_factor": 4,
+		"min_expansion_cooldown": 169200,
+		"max_expansion_cooldown": 414000,
+	},
+	"unit_group": {
+		"min_group_gathering_time": 3600,
+		"max_group_gathering_time": 36000,
+		"max_wait_time_for_late_members": 7200,
+		"max_group_radius": 30,
+		"min_group_radius": 5,
+		"max_member_speedup_when_behind": 1.4,
+		"max_member_slowdown_when_ahead": 0.6,
+		"max_group_slowdown_factor": 0.3,
+		"max_group_member_fallback_factor": 3,
+		"member_disown_distance": 10,
+		"tick_tolerance_when_member_arrives": 60,
+		"max_gathering_unit_groups": 30,
+		"max_unit_group_size": 200,
+	},
+	"path_finder": {
+		"fwd2bwd_ratio": 5,
+		"goal_pressure_ratio": 2,
+		"use_path_cache": true,
+		"max_steps_worked_per_tick": 1000,
+		"max_work_done_per_tick": 8000,
+		"short_cache_size": 5,
+		"long_cache_size": 25,
+		"short_cache_min_cacheable_distance": 10,
+		"short_cache_min_algo_steps_to_cache": 50,
+		"long_cache_min_cacheable_distance": 30,
+		"cache_max_connect_to_cache_steps_multiplier": 100,
+		"cache_accept_path_start_distance_ratio": 0.2,
+		"cache_accept_path_end_distance_ratio": 0.15,
+		"negative_cache_accept_path_start_distance_ratio": 0.3,
+		"negative_cache_accept_path_end_distance_ratio": 0.3,
+		"cache_path_start_distance_rating_multiplier": 10,
+		"cache_path_end_distance_rating_multiplier": 20,
+		"stale_enemy_with_same_destination_collision_penalty": 30,
+		"ignore_moving_enemy_collision_distance": 5,
+		"enemy_with_different_destination_collision_penalty": 30,
+		"general_entity_collision_penalty": 10,
+		"general_entity_subsequent_collision_penalty": 3,
+		"extended_collision_penalty": 3,
+		"max_clients_to_accept_any_new_request": 10,
+		"max_clients_to_accept_short_new_request": 100,
+		"direct_distance_to_consider_short_request": 100,
+		"short_request_max_steps": 1000,
+		"short_request_ratio": 0.5,
+		"min_steps_to_check_path_find_termination": 2000,
+		"start_to_goal_cost_multiplier_to_terminate_path_find": 2000,
+		"overload_levels": [0, 100, 500],
+		"overload_multipliers": [2, 3, 4],
+		"negative_path_cache_delay_interval": 20,
+	},
+	"max_failed_behavior_count": 3,
+	"difficulty_settings": {
+		"technology_price_multiplier": 12,
+		"spoil_time_modifier": 1,
+	},
+	"asteroids": {
+		"spawning_rate": 1,
+		"max_ray_portals_expanded_per_tick": 100,
+	},
+};
+
 const modified_space_age_map_gen_settings = {
 	autoplace_controls: {
 		"aquilo_crude_oil": { frequency: 1, size: 1, richness: 1 },
@@ -553,5 +701,7 @@ module.exports = {
 	modified_map_settings,
 	modified_v2_map_gen_settings,
 	modified_v2_map_settings,
+	modified_v2_1_map_gen_settings,
+	modified_v2_1_map_settings,
 	modified_space_age_map_gen_settings,
 };
diff --git a/test/lib/factorio/test_strings.js b/test/lib/factorio/test_strings.js
index 6c724629..8b81be75 100644
--- a/test/lib/factorio/test_strings.js
+++ b/test/lib/factorio/test_strings.js
@@ -49,6 +49,22 @@ Ln6IET6h2alhiMgvQ3SGxnDDDd32daT/yCD5fQ8R3WMEyeN/PENaNmy
 E5utYOI24z/cT+oQf48FdgozaFZg6qX+1KqW+GYyy4qNZgFNY/0IAHj
 RI5Q/27QvL<<<`;
 
+const modified_v2_1 = `
+>>>eNp1U89rE0EUftM0NYlVc4iCIjWHHkRICNFTkezoRTx4ELxKnGwm
+unSz087uVlsP5uDBg1CQXvSiVyt6EY9CwIu9if4DlXqwt1aK9CDEeZm
+dyZrgg/f49nu/37BTQCAPGYDZaVcwH6DnGC24YmmJy4qQHAAsnXdl3O
+YV4fkplhZ4wLurlRYLMZgC9IeunCdFoCv0bYXZgMUrXth0fa/TSXfMS
+uEuhmnmVBgxGXnB3SaTnDW7wgujGKulksJIBEnThIkk5+GbzU1HaQOZ
+o7FkgRd39SQ95HXkfRZxiXuYSCDvf93e6j2eA9TBIygPBqgKbas4VCA
+9HU0UmUi26IogksJfYPGDhZbHwnylVq3XUE6mXR3Jl2MeuKu5erX2r9
+ssN5Z+ZsI/qlGrXhxKnvt8hUWeCE5Y1PTZIg+zyZGhfEXpVXs4QsjD0
+rtr39c2HKJXqNIEHCZMv2WY6wl49pb+zzVtXHDJgD1HNdm/t/Pkw+FB
+g/x5vf/1RuuOQ279KC6HF3YbynkMj5lBM2ORzt02U+XoOKPAi+couw7
+JYkZplFakZG9jCkjt5gyQ4nHFv3qqTPmsjWiYeiVKOkP57RB9xB0Dvk
+00n6fkMnaZQ/MZTXbUFKhaRYN1Sug54z09ClH5dUjP0MYvvcaWafsp1
+X9skPmJ46b3GGNscC4FCtiwbc3PTPrUX46YL/qSDp8BMOqAJI8C+u/S
+peyl8e7GC3Ce2le3AIs019Y//gU3lOV1<<<`;
+
 const modified_space_age = `
 >>>eNp1VEFoE0EUnUkb27TWBomFSqkBexAhMVZPRbJbL+LBg+BV1slm
 kgzd7LYzs9HYgz304EEQpJf2Yq9W9CIevBW8WFAQPXmr1IOCh1aL9CD
@@ -74,5 +90,6 @@ module.exports = {
 	default: default_,
 	modified,
 	modified_v2,
+	modified_v2_1,
 	modified_space_age,
 };