diff --git a/pom.xml b/pom.xml
index 52836c95..59d7d613 100644
--- a/pom.xml
+++ b/pom.xml
@@ -6,7 +6,7 @@
 
     <groupId>dev.katsute</groupId>
     <artifactId>mal4j</artifactId>
-    <version>3.4.2</version>
+    <version>3.4.3</version>
 
     <profiles>
         <profile>
diff --git a/src/main/java/dev/katsute/mal4j/property/RelationType.java b/src/main/java/dev/katsute/mal4j/property/RelationType.java
index 2722a49e..30eeb393 100644
--- a/src/main/java/dev/katsute/mal4j/property/RelationType.java
+++ b/src/main/java/dev/katsute/mal4j/property/RelationType.java
@@ -25,7 +25,7 @@
  *
  * @see RelatedMedia#getRelationType()
  * @since 1.0.0
- * @version 2.9.0
+ * @version 3.4.3
  * @author Katsute
  */
 public enum RelationType implements FieldEnum {
@@ -35,6 +35,7 @@ public enum RelationType implements FieldEnum {
     Other               ("other"),
     Sequel              ("sequel"),
     Prequel             ("prequel"),
+    Adaptation          ("adaptation"),
     AlternativeSetting  ("alternative_setting"),
     AlternativeVersion  ("alternative_version"),
     SideStory           ("side_story"),
diff --git a/src/test/java/dev/katsute/mal4j/MangaTests/TestManga.java b/src/test/java/dev/katsute/mal4j/MangaTests/TestManga.java
index 86620b20..23139faf 100644
--- a/src/test/java/dev/katsute/mal4j/MangaTests/TestManga.java
+++ b/src/test/java/dev/katsute/mal4j/MangaTests/TestManga.java
@@ -4,8 +4,10 @@
 import dev.katsute.mal4j.MyAnimeList;
 import dev.katsute.mal4j.TestProvider;
 import dev.katsute.mal4j.manga.Manga;
+import dev.katsute.mal4j.manga.RelatedManga;
 import dev.katsute.mal4j.manga.property.MangaPublishStatus;
 import dev.katsute.mal4j.manga.property.MangaType;
+import dev.katsute.mal4j.property.RelationType;
 import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.params.ParameterizedTest;
@@ -144,6 +146,9 @@ final void testEnum(){
         assertEquals(MangaPublishStatus.Unknown, MangaPublishStatus.asEnum("?"));
         assertEquals(MangaType.Unknown, MangaType.asEnum("?"));
 
+        for(final RelatedManga relatedManga : mal.getManga(112589).getRelatedManga())
+            assertNotEquals(RelationType.Unknown, relatedManga.getRelationType(), "Unknown type: " + relatedManga.getRawRelationType());
+
         assumeTrue(MangaPublishStatus.OnHiatus == mal.getManga(2).getStatus(), "Test will fail when status is not hiatus");
     }