diff --git a/pom.xml b/pom.xml
index f7516c7..eb577d7 100644
--- a/pom.xml
+++ b/pom.xml
@@ -159,6 +159,13 @@
             <scope>test</scope>
         </dependency>
 
+        <dependency>
+            <groupId>edu.stanford.protege</groupId>
+            <artifactId>webprotege-jackson</artifactId>
+            <version>0.9.2</version>
+            <scope>test</scope>
+        </dependency>
+
 
     </dependencies>
 
diff --git a/src/main/java/edu/stanford/protege/webprotege/hierarchy/AddEdge.java b/src/main/java/edu/stanford/protege/webprotege/hierarchy/AddEdge.java
index 055968d..9a22fdb 100644
--- a/src/main/java/edu/stanford/protege/webprotege/hierarchy/AddEdge.java
+++ b/src/main/java/edu/stanford/protege/webprotege/hierarchy/AddEdge.java
@@ -2,6 +2,7 @@
 
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.annotation.JsonTypeName;
 import com.google.common.base.MoreObjects;
 
 /**
@@ -9,6 +10,7 @@
  * Stanford Center for Biomedical Informatics Research
  * 2021-04-20
  */
+@JsonTypeName("webprotege.events.graph.AddEdge")
 public class AddEdge<U> extends EdgeChange<U> {
 
     @JsonCreator
diff --git a/src/main/java/edu/stanford/protege/webprotege/hierarchy/RemoveEdge.java b/src/main/java/edu/stanford/protege/webprotege/hierarchy/RemoveEdge.java
index c6314aa..f1d13d1 100644
--- a/src/main/java/edu/stanford/protege/webprotege/hierarchy/RemoveEdge.java
+++ b/src/main/java/edu/stanford/protege/webprotege/hierarchy/RemoveEdge.java
@@ -2,6 +2,7 @@
 
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.annotation.JsonTypeName;
 import com.google.common.base.MoreObjects;
 
 /**
@@ -9,6 +10,7 @@
  * Stanford Center for Biomedical Informatics Research
  * 2021-04-20
  */
+@JsonTypeName("webprotege.events.graph.RemoveEdge")
 public class RemoveEdge<U> extends EdgeChange<U> {
 
     @JsonCreator
diff --git a/src/test/java/edu/stanford/protege/webprotege/hierarchy/AddEdge_Serialization_Test.java b/src/test/java/edu/stanford/protege/webprotege/hierarchy/AddEdge_Serialization_Test.java
new file mode 100644
index 0000000..13cdf80
--- /dev/null
+++ b/src/test/java/edu/stanford/protege/webprotege/hierarchy/AddEdge_Serialization_Test.java
@@ -0,0 +1,55 @@
+package edu.stanford.protege.webprotege.hierarchy;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import edu.stanford.protege.webprotege.MockingUtils;
+import edu.stanford.protege.webprotege.entity.EntityNode;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.json.AutoConfigureJsonTesters;
+import org.springframework.boot.test.autoconfigure.json.JsonTest;
+import org.springframework.boot.test.json.JacksonTester;
+
+import java.io.IOException;
+import java.io.StringReader;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@JsonTest
+@AutoConfigureJsonTesters
+class AddEdge_Serialization_Test {
+
+    @Autowired
+    JacksonTester<GraphModelChange<EntityNode>> tester;
+
+    @Autowired
+    ObjectMapper objectMapper;
+
+    @BeforeEach
+    void setUp() throws JsonProcessingException {
+    }
+
+    @Test
+    void shouldSerializeAsJson() throws IOException {
+        var written = tester.write(new AddEdge<>(
+                new GraphEdge<>(
+                        GraphNode.getForEntityNode(MockingUtils.mockOWLClassNode(),
+                                                   false),
+                        GraphNode.getForEntityNode(MockingUtils.mockOWLClassNode(),
+                                                   false)
+                )
+        ));
+        assertThat(written).hasJsonPathStringValue("type", "webprotege.events.graph.AddEdge");
+        assertThat(written).hasJsonPath("edge");
+    }
+
+    @Test
+    void shouldDeserializeFromJson() throws IOException {
+        var json = """
+                {"type":"webprotege.events.graph.AddEdge","edge":{"predecessor":{"userObject":{"entity":{"@type":"Class","iri":"http://stuff.com/I0"},"browserText":"<http://stuff.com/I0>","tags":[],"deprecated":false,"watches":[],"openCommentCount":0,"shortForms":[]},"sink":false},"successor":{"userObject":{"entity":{"@type":"Class","iri":"http://stuff.com/I1"},"browserText":"<http://stuff.com/I1>","tags":[],"deprecated":false,"watches":[],"openCommentCount":0,"shortForms":[]},"sink":false}}}
+                """;
+        var read = tester.readObject(new StringReader(json));
+        assertThat(read).isInstanceOf(AddEdge.class);
+    }
+}
\ No newline at end of file
diff --git a/src/test/java/edu/stanford/protege/webprotege/hierarchy/RemoveEdge_Serialization_Test.java b/src/test/java/edu/stanford/protege/webprotege/hierarchy/RemoveEdge_Serialization_Test.java
new file mode 100644
index 0000000..e354b78
--- /dev/null
+++ b/src/test/java/edu/stanford/protege/webprotege/hierarchy/RemoveEdge_Serialization_Test.java
@@ -0,0 +1,60 @@
+package edu.stanford.protege.webprotege.hierarchy;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import edu.stanford.protege.webprotege.MockingUtils;
+import edu.stanford.protege.webprotege.entity.EntityNode;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.json.AutoConfigureJsonTesters;
+import org.springframework.boot.test.autoconfigure.json.JsonTest;
+import org.springframework.boot.test.json.JacksonTester;
+
+import java.io.IOException;
+import java.io.StringReader;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Matthew Horridge
+ * Stanford Center for Biomedical Informatics Research
+ * 2024-04-18
+ */
+@JsonTest
+@AutoConfigureJsonTesters
+class RemoveEdge_Serialization_Test {
+
+    @Autowired
+    JacksonTester<GraphModelChange<EntityNode>> tester;
+
+    @Autowired
+    ObjectMapper objectMapper;
+
+    @BeforeEach
+    void setUp() throws JsonProcessingException {
+    }
+
+    @Test
+    void shouldSerializeAsJson() throws IOException {
+        var written = tester.write(new RemoveEdge<>(
+                new GraphEdge<>(
+                        GraphNode.getForEntityNode(MockingUtils.mockOWLClassNode(),
+                                                   false),
+                        GraphNode.getForEntityNode(MockingUtils.mockOWLClassNode(),
+                                                   false)
+                )
+        ));
+        assertThat(written).hasJsonPathStringValue("type", "webprotege.events.graph.RemoveEdge");
+        assertThat(written).hasJsonPath("edge");
+    }
+
+    @Test
+    void shouldDeserializeFromJson() throws IOException {
+        var json = """
+                {"type":"webprotege.events.graph.RemoveEdge","edge":{"predecessor":{"userObject":{"entity":{"@type":"Class","iri":"http://stuff.com/I0"},"browserText":"<http://stuff.com/I0>","tags":[],"deprecated":false,"watches":[],"openCommentCount":0,"shortForms":[]},"sink":false},"successor":{"userObject":{"entity":{"@type":"Class","iri":"http://stuff.com/I1"},"browserText":"<http://stuff.com/I1>","tags":[],"deprecated":false,"watches":[],"openCommentCount":0,"shortForms":[]},"sink":false}}}
+                """;
+        var read = tester.readObject(new StringReader(json));
+        assertThat(read).isInstanceOf(RemoveEdge.class);
+    }
+}