diff --git a/packages/lib/src/factorio/exchange_string.ts b/packages/lib/src/factorio/exchange_string.ts
index 3749fd6a..38d2a36a 100644
--- a/packages/lib/src/factorio/exchange_string.ts
+++ b/packages/lib/src/factorio/exchange_string.ts
@@ -239,7 +239,9 @@ function readPollution(state: MapReaderState) {
 		pollution_with_max_forest_damage: readOptional(state, readDouble),
 		pollution_per_tree_damage: readOptional(state, readDouble),
 		pollution_restored_per_tree_damage: readOptional(state, readDouble),
-		max_pollution_to_restore_trees: readOptional(state, readDouble),
+		...state.versionAtLeast(2, 1, 18) ? {} : {
+			max_pollution_to_restore_trees: readOptional(state, readDouble), // removed v2.1.18
+		},
 		enemy_attack_pollution_consumption_modifier: readOptional(state, readDouble),
 	};
 }
diff --git a/test/integration/clusterio.js b/test/integration/clusterio.js
index 8508482f..08ee24b7 100644
--- a/test/integration/clusterio.js
+++ b/test/integration/clusterio.js
@@ -1289,8 +1289,11 @@ describe("Integration of Clusterio", function() {
 				const isV2 = version > lib.integerPartialVersion("2.0");
 				const isV2_1 = version > lib.integerPartialVersion("2.1");
 				const isV2_1_13 = version >= lib.integerPartialVersion("2.1.13");
+				const isV2_1_18 = version >= lib.integerPartialVersion("2.1.18");
 				let exchangeString = testStrings.modified;
-				if (isV2_1_13) {
+				if (isV2_1_18) {
+					exchangeString = testStrings.modified_v2_1_18;
+				} else if (isV2_1_13) {
 					exchangeString = testStrings.modified_v2_1_13;
 				} else if (isV2_1) {
 					exchangeString = testStrings.modified_v2_1;
diff --git a/test/lib/factorio/exchange_string.js b/test/lib/factorio/exchange_string.js
index 9ea118dc..fda40834 100644
--- a/test/lib/factorio/exchange_string.js
+++ b/test/lib/factorio/exchange_string.js
@@ -78,6 +78,26 @@ describe("lib/factorio/exchange_string", function() {
 			});
 		});
 
+		it("should parse v2.1.17 strings", function() {
+			assert.deepEqual(lib.readMapExchangeString(testStrings.modified_v2_1_17), {
+				version: [2, 1, 17, 0],
+				unknown: 0,
+				map_gen_settings: testSettings.modified_v2_1_map_gen_settings,
+				map_settings: testSettings.modified_v2_1_13_map_settings,
+				checksum: 1073352633,
+			});
+		});
+
+		it("should parse post v2.1.18 strings", function() {
+			assert.deepEqual(lib.readMapExchangeString(testStrings.modified_v2_1_18), {
+				version: [2, 1, 18, 4],
+				unknown: 0,
+				map_gen_settings: testSettings.modified_v2_1_map_gen_settings,
+				map_settings: testSettings.modified_v2_1_18_map_settings,
+				checksum: 1437579271,
+			});
+		});
+
 		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 c1d397f4..b902e90d 100644
--- a/test/lib/factorio/test_settings.js
+++ b/test/lib/factorio/test_settings.js
@@ -622,6 +622,14 @@ export const modified_v2_1_13_map_settings = {
 	},
 };
 
+export const modified_v2_1_18_map_settings = {
+	...modified_v2_1_13_map_settings,
+	"pollution": Object.fromEntries(
+		Object.entries(modified_v2_1_13_map_settings.pollution)
+			.filter(([key]) => key !== "max_pollution_to_restore_trees")
+	),
+};
+
 export const modified_space_age_map_gen_settings = {
 	autoplace_controls: {
 		"aquilo_crude_oil": { frequency: 1, size: 1, richness: 1 },
diff --git a/test/lib/factorio/test_strings.js b/test/lib/factorio/test_strings.js
index 331993e9..36fa5116 100644
--- a/test/lib/factorio/test_strings.js
+++ b/test/lib/factorio/test_strings.js
@@ -100,3 +100,35 @@ JYkZpmFakZGd1AkjtxhSQjYziizPKvHmmTPmUDWuYoiVKOgP57RB9yS
 0Dvo1NMEfJJWw1i+YLmuywM1C1jwbPKaGnjffEMETl1yE9Qxu/9C7rp
 u3nVP+RQebGLpzeY4SxwbkUKGDDtjU/J9P3/nrIfNHXdPAWgFF7JHkZ
 0L+YLmXPjcc3XoAz1D69BVjk1sULxb83nuUA<<<`;
+
+export const modified_v2_1_17 = `
+>>>eNp1U89rE0EUftMmNYnVRoiCIjWHHkRICNFTkezoRTx4ELxKnGwm
+unS7087uVqsHc/DgQRCkF73o1YpexIO3gBd7k/oPVOrB3lopUkSI8zI
+7kzXBB+/x7fd+v2EngMAxUDKdcQXzAbqO0YIrlpa4rAjJld/SeVfGbV
+4Rnp9iaYEHfHG10mIhBlOA3sCV86QIdIWerTAdsHjFC5uu73U66Y5ZK
+dyFMM2cCCMmIy+43WSSs+ai8MIoxmqppDASQdI0YSLJefhmfd1R2kDm
+cCxZ4MWLepIu8jryLou4xD1MJJD3P29udB/NAmr/IZT7fVSFtlQcKpC
+ujiaKTCRbdEUQSeHPs/jefMtjYb5Sq9ZrKMfTro7kyzEP3NVcvVr712
+2WG0k/NeYf1qhVzw8kz32+wiJPBDMWNX22wMNscmQoX1J62R6OEPKg9
+O7Kt/trDtErVGkCDhKm1zLM1QQ8e0v/58oYF1wwYNdRTfbubD/+cLDf
+IH9e721ea91yyI3vxeXw3E5DOY/gMSfRTFmkc7fMVDk6yijw4jnKjkO
+ymFEaphUp2V2bAFK7PgVkM6P44lFlXj1RpnzahjVM0RIlnYH8coi+5L
+YBX8cmmKPkIraaRfMZTXbYGajaR4OnlNAzxntyGKLy65CeoY1fepcN0
+/ZTqv/IIHNjF07vMcLY4FwKFLBh25ofk+l7fzlkvuhLOngLwKh9krwM
+6F9Ml7LnxuMbL8BZap/eAizycea38xdDLuYt<<<`;
+
+export const modified_v2_1_18 = `
+>>>eNp1U89rE0EUftMmbRKrBomCIjWHHkRICNFTkezoRTx4EPQocbKZ
+6NLNTju7W60ezMGDB0GQXvSiVyvqQQSPBS/2JvUfqNSDvbVSpAchzsv
+sTNZUH7zHt9/7/SYZAwJHIAMwlXEF8wF6jtGCK+bnuawIyQHA0nlXxm
+1eEZ6fYmmBB7y7VGmxEIMpwOrAlfOkCHSFVVthKmDxohc2Xd/rdNIds
+1K4c2GaORZGTEZecKvJJGfNrvDCKMZqqaQwEkHSNGEiyXn4emXFUdpA
+5kAsWeDFXT1JD3kdeYdFXOIeJhLI+5831noPpwG1/wDK/T6qQhsqDhV
+IT0cTRSaSLboiiKTwZ1l8d7blsTBfqVXrNZSjaVdH8oWYB+5Srl6t/e
+02y42kn9jnH9aoVc8OJM99vsgiTwSHLWr6bI6H2eTIUL6g9KI9HCHkf
+untpW/3lh2iV6jSBOwlzGrLMJcT8PQN/Z8rY1yw7ajaO7c3H33Y222Q
+36921q+0bjrk2vfiQnhmq6GcB/GG42gmLNK5G2aYHB1lFHj+DGXLIVn
+MKA3TipRsL48BqV2dALKufsykeEiZl4+VKZ+0YQ1TtERJZyC/HKIPuG
+nA130TzFByHltNo/mMJjvsDFTto8ETSugp4z0+DFH5dUjP0MYvvcuaa
+fsp1X9kkBkzyDn6jz1GGBucS4ECNmxb82M8fe8vk+aLvqCDtwCM2iXJ
+y4D+Z+lS9tx4fOMFOE3t01uARSY/vrv+B8BC5X8=<<<`;