diff --git a/pom.xml b/pom.xml
index 51ee3eda..b08d7395 100644
--- a/pom.xml
+++ b/pom.xml
@@ -27,21 +27,10 @@
     </repositories>
 
     <dependencies>
-        <dependency>
-            <groupId>fr.inria.gforge.spoon</groupId>
-            <artifactId>spoon-core</artifactId>
-            <version>10.4.1</version>
-        </dependency>
         <dependency>
             <groupId>fr.inria.gforge.spoon.labs</groupId>
             <artifactId>gumtree-spoon-ast-diff</artifactId>
-            <version>1.46</version>
-            <exclusions>
-                <exclusion>
-                    <groupId>fr.inria.gforge.spoon</groupId>
-                    <artifactId>spoon-core</artifactId>
-                </exclusion>
-            </exclusions>
+            <version>1.87</version>
         </dependency>
         <dependency>
             <groupId>org.junit.jupiter</groupId>
@@ -55,8 +44,7 @@
             <version>1.10.2</version>
             <scope>test</scope>
         </dependency>
-
-
+        
         <!-- logging -->
         <dependency>
             <groupId>org.slf4j</groupId>
diff --git a/src/main/kotlin/se/kth/spork/spoon/Spoon3dmMerge.kt b/src/main/kotlin/se/kth/spork/spoon/Spoon3dmMerge.kt
index 31801282..674fa5c7 100644
--- a/src/main/kotlin/se/kth/spork/spoon/Spoon3dmMerge.kt
+++ b/src/main/kotlin/se/kth/spork/spoon/Spoon3dmMerge.kt
@@ -1,8 +1,8 @@
 package se.kth.spork.spoon
 
-import com.github.gumtreediff.matchers.Matcher
-import com.github.gumtreediff.matchers.Matchers
-import com.github.gumtreediff.tree.ITree
+import com.github.gumtreediff.matchers.CompositeMatchers
+import com.github.gumtreediff.matchers.MappingStore
+import com.github.gumtreediff.tree.Tree
 import gumtree.spoon.builder.SpoonGumTreeBuilder
 import se.kth.spork.base3dm.ChangeSet
 import se.kth.spork.base3dm.Revision
@@ -39,7 +39,7 @@ import java.util.Arrays
 import java.util.HashSet
 
 /**
- * Spoon specialization of the 3DM merge algorithm.
+ * Spoon specialization of the 3DM merge algorithm for Spork.
  *
  * @author Simon Larsén
  */
@@ -86,8 +86,8 @@ object Spoon3dmMerge {
         base: T,
         left: T,
         right: T,
-        baseMatcher: (ITree, ITree) -> Matcher,
-        leftRightMatcher: (ITree, ITree) -> Matcher,
+        baseMatcher: (Tree, Tree) -> MappingStore,
+        leftRightMatcher: (Tree, Tree) -> MappingStore,
     ): Pair<T, Int> {
         val start = System.nanoTime()
 
@@ -101,9 +101,9 @@ object Spoon3dmMerge {
         val baseRightGumtreeMatch = baseMatcher(baseGumtree, rightGumtree)
         val leftRightGumtreeMatch = leftRightMatcher(leftGumtree, rightGumtree)
         LOGGER.info { "Converting GumTree matches to Spoon matches" }
-        val baseLeft = fromGumTreeMapping(baseLeftGumtreeMatch.mappings)
-        val baseRight = fromGumTreeMapping(baseRightGumtreeMatch.mappings)
-        val leftRight = fromGumTreeMapping(leftRightGumtreeMatch.mappings)
+        val baseLeft = fromGumTreeMapping(baseLeftGumtreeMatch)
+        val baseRight = fromGumTreeMapping(baseRightGumtreeMatch)
+        val leftRight = fromGumTreeMapping(leftRightGumtreeMatch)
 
         // 3DM PHASE
         LOGGER.info { "Mapping nodes to class representatives" }
@@ -210,7 +210,7 @@ object Spoon3dmMerge {
      * @return A pair on the form (mergeTree, numConflicts).
      */
     fun <T : CtElement> merge(base: T, left: T, right: T): Pair<T, Int> {
-        return merge(base, left, right, ::matchTrees, ::matchTreesXY)
+        return merge(base, left, right, ::matchTrees, ::matchTreesLeftRight)
     }
 
     private fun mergeMetadataElements(
@@ -356,16 +356,14 @@ object Spoon3dmMerge {
         return merge.toList().sortedBy(CtImport::toString)
     }
 
-    private fun matchTrees(src: ITree, dst: ITree): Matcher {
-        val matcher = Matchers.getInstance().getMatcher(src, dst)
-        matcher.match()
-        return matcher
+    private fun matchTrees(src: Tree, dst: Tree): MappingStore {
+        val matcher = CompositeMatchers.SimpleIdGumtree()
+        return matcher.match(src, dst)
     }
 
-    private fun matchTreesXY(src: ITree, dst: ITree): Matcher {
-        val matcher = Matchers.getInstance().getMatcher("xy", src, dst)
-        matcher.match()
-        return matcher
+    private fun matchTreesLeftRight(src: Tree, dst: Tree): MappingStore {
+        val matcher = CompositeMatchers.SimpleIdGumtree()
+        return matcher.match(src, dst)
     }
 
     init {
diff --git a/src/main/kotlin/se/kth/spork/spoon/matching/SpoonMapping.kt b/src/main/kotlin/se/kth/spork/spoon/matching/SpoonMapping.kt
index 1e54a7e5..9fc56c77 100644
--- a/src/main/kotlin/se/kth/spork/spoon/matching/SpoonMapping.kt
+++ b/src/main/kotlin/se/kth/spork/spoon/matching/SpoonMapping.kt
@@ -1,7 +1,7 @@
 package se.kth.spork.spoon.matching
 
 import com.github.gumtreediff.matchers.MappingStore
-import com.github.gumtreediff.tree.ITree
+import com.github.gumtreediff.tree.Tree
 import com.github.gumtreediff.utils.Pair
 import gumtree.spoon.builder.CtWrapper
 import gumtree.spoon.builder.SpoonGumTreeBuilder
@@ -164,9 +164,9 @@ class SpoonMapping private constructor() {
                 if (spoonSrc == null || spoonDst == null) {
                     // at least one was non-null
                     check(!(spoonSrc !== spoonDst))
-                    check(m.first.type == -1) { // -1 is the type given to root node in SpoonGumTreeBuilder
+                    check(m.first.type.name.equals("root")) { // -1 is the type given to root node in SpoonGumTreeBuilder
                         (
-                            "non-root node " + m.first.toShortString() +
+                            "non-root node " + m.first.toString() +
                                 " had no mapped Spoon object"
                             )
                     }
@@ -213,7 +213,7 @@ class SpoonMapping private constructor() {
             return elem.parent is CtAnnotation<*> && elem.roleInParent == CtRole.VALUE
         }
 
-        private fun getSpoonNode(gumtreeNode: ITree): CtElement? {
+        private fun getSpoonNode(gumtreeNode: Tree): CtElement? {
             return gumtreeNode.getMetadata(SpoonGumTreeBuilder.SPOON_OBJECT) as CtElement?
         }
     }
diff --git a/src/test/java/se/kth/spork/Util.java b/src/test/java/se/kth/spork/Util.java
index 0ab39fec..0a1d199c 100644
--- a/src/test/java/se/kth/spork/Util.java
+++ b/src/test/java/se/kth/spork/Util.java
@@ -1,6 +1,6 @@
 package se.kth.spork;
 
-import com.github.gumtreediff.tree.ITree;
+import com.github.gumtreediff.tree.Tree;
 import gumtree.spoon.builder.SpoonGumTreeBuilder;
 import java.io.File;
 import java.io.IOException;
@@ -53,7 +53,7 @@ public static String read(Path path) throws IOException {
         return String.join("\n", Files.readAllLines(path));
     }
 
-    public static ITree toGumTree(String clazz) {
+    public static Tree toGumTree(String clazz) {
         CtClass<?> spoonTree = Launcher.parseClass(clazz);
         SpoonGumTreeBuilder builder = new SpoonGumTreeBuilder();
         return builder.getTree(spoonTree);