diff --git a/README.md b/README.md
index c8c49bb..ed1a915 100644
--- a/README.md
+++ b/README.md
@@ -18,16 +18,16 @@ Depending on which part of the API you use, you can only include what you need:
 <tr><th>Class</th><th>Dependency</th><th>Description</th></tr>
 <tr><td>CapabilitiesApi</td><td><pre>de.westnordost:osmapi-core:2.0</pre></td><td>Getting server capabilities</td></tr>
 <tr><td>PermissionsApi</td><td><pre>de.westnordost:osmapi-core:2.0</pre></td><td>Getting user permissions</td></tr>
-<tr><td>MapDataApi</td><td><pre>de.westnordost:osmapi-map:2.1</pre></td><td>Getting map data, querying single elements and their relations toward each other and uploading changes in changesets</td></tr>
-<tr><td>MapDataHistoryApi</td><td><pre>de.westnordost:osmapi-map:2.1</pre></td><td>Getting the history and specific versions of elements</td></tr>
+<tr><td>MapDataApi</td><td><pre>de.westnordost:osmapi-map:2.2</pre></td><td>Getting map data, querying single elements and their relations toward each other and uploading changes in changesets</td></tr>
+<tr><td>MapDataHistoryApi</td><td><pre>de.westnordost:osmapi-map:2.2</pre></td><td>Getting the history and specific versions of elements</td></tr>
 <tr><td>NotesApi</td><td><pre>de.westnordost:osmapi-notes:2.0</pre></td><td>Getting finding, creating, commenting on and solving notes</td></tr>
 <tr><td>GpsTracesApi</td><td><pre>de.westnordost:osmapi-traces:2.0</pre></td><td>Getting, uploading, updating and deleting GPS traces and trackpoints</td></tr>
-<tr><td>ChangesetsApi</td><td><pre>de.westnordost:osmapi-changesets:2.1</pre></td><td>Finding changesets, changeset discussion, subscription and data</td></tr>
+<tr><td>ChangesetsApi</td><td><pre>de.westnordost:osmapi-changesets:2.2</pre></td><td>Finding changesets, changeset discussion, subscription and data</td></tr>
 <tr><td>UserApi</td><td><pre>de.westnordost:osmapi-user:2.0</pre></td><td>Getting user information</td></tr>
 <tr><td>UserPreferencesApi</td><td><pre>de.westnordost:osmapi-user:2.0</pre></td><td>Managing user preferences</td></tr>
 </table>
 
-To include everything, add [`de.westnordost:osmapi:4.1`](https://mvnrepository.com/artifact/de.westnordost/osmapi/4.0) as a Maven dependency or download the jar from there.
+To include everything, add [`de.westnordost:osmapi:4.2`](https://mvnrepository.com/artifact/de.westnordost/osmapi/4.0) as a Maven dependency or download the jar from there.
 
 ### Android
 
@@ -35,7 +35,7 @@ On Android, you need to exclude kxml2 from the dependencies since it is already
 
 ```gradle
 dependencies {
-    implementation 'de.westnordost:osmapi:4.0'
+    implementation 'de.westnordost:osmapi:4.2'
 }
 
 configurations {
diff --git a/build.gradle b/build.gradle
index 4b829b9..6af9993 100644
--- a/build.gradle
+++ b/build.gradle
@@ -8,16 +8,16 @@ subprojects {
 
     group = "de.westnordost"
 
-    sourceCompatibility = 1.7
-    targetCompatibility = 1.7
+    sourceCompatibility = 1.8
+    targetCompatibility = 1.8
 }
 
 ext {
-    all_version = 4.1
+    all_version = 4.2
     core_version = 2.0
-    changesets_version = 2.1
+    changesets_version = 2.2
     user_version = 2.0
     traces_version = 2.0
     notes_version = 2.0
-    map_version = 2.1
+    map_version = 2.2
 }
\ No newline at end of file
diff --git a/libs/map/src/main/java/de/westnordost/osmapi/map/data/OsmTags.java b/libs/map/src/main/java/de/westnordost/osmapi/map/data/OsmTags.java
index cccba4b..6083f09 100644
--- a/libs/map/src/main/java/de/westnordost/osmapi/map/data/OsmTags.java
+++ b/libs/map/src/main/java/de/westnordost/osmapi/map/data/OsmTags.java
@@ -37,15 +37,15 @@ public void putAll(Map<? extends String, ? extends String> map)
 
 	private static void checkKeyValueLength(String key, String value)
 	{
-		if(key.length() > 256)
+		if(key.codePoints().count() >= 256)
 		{
 			throw new IllegalArgumentException("For key \"" + key + "\": Key length is limited" +
-					"to less or equal 256 characters.");
+					" to less than 256 characters.");
 		}
-		if(value.length() > 256)
+		if(value.codePoints().count() >= 256)
 		{
 			throw new IllegalArgumentException("For value \"" + value + "\": Value length is " +
-					"limited to less or equal 256 characters.");
+					"limited to less than 256 characters.");
 		}
 	}
 }
diff --git a/libs/map/src/test/java/de/westnordost/osmapi/map/data/OsmTagsTest.java b/libs/map/src/test/java/de/westnordost/osmapi/map/data/OsmTagsTest.java
index 18e613e..0b1bc52 100644
--- a/libs/map/src/test/java/de/westnordost/osmapi/map/data/OsmTagsTest.java
+++ b/libs/map/src/test/java/de/westnordost/osmapi/map/data/OsmTagsTest.java
@@ -14,11 +14,24 @@ public class OsmTagsTest
 			"Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy "
 			+ "eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptu"
 			+ "a. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gube"
-			+ "rgren, no sead takimata ";
+			+ "rgren, no sea takimata ";
 
-	@Test public void testStringIsExactly257CharactersLong()
+	@Test public void testStringIsExactly256CharactersLong()
 	{
-		assertEquals(257, TOO_LONG.length());
+		assertEquals(256, TOO_LONG.length());
+	}
+
+	@Test public void initWithKeyOrValueBelow256CharactersIsFine()
+	{
+		StringBuilder cools = new StringBuilder();
+		while (cools.codePoints().count() < 255)
+		{
+			cools.append("\uD83D\uDE0E"); // 😎
+
+			Map<String, String> tags = new HashMap<>();
+			tags.put(cools.toString(), cools.toString());
+			new OsmTags(tags);
+		}
 	}
 
 	@Test public void initWithTooLongKeyFails()