diff --git a/dids/src/main/kotlin/web5/sdk/dids/did/BearerDid.kt b/dids/src/main/kotlin/web5/sdk/dids/did/BearerDid.kt
index 7a5658c70..7433ae156 100644
--- a/dids/src/main/kotlin/web5/sdk/dids/did/BearerDid.kt
+++ b/dids/src/main/kotlin/web5/sdk/dids/did/BearerDid.kt
@@ -7,6 +7,7 @@ import web5.sdk.crypto.KeyManager
 import web5.sdk.crypto.jwk.Jwk
 import web5.sdk.dids.didcore.DidDocument
 import web5.sdk.dids.didcore.Did
+import web5.sdk.dids.didcore.Service
 import web5.sdk.dids.didcore.VMSelector
 import web5.sdk.dids.didcore.VerificationMethod
 
@@ -61,6 +62,41 @@ public class BearerDid(
     return Pair(signer, verificationMethod)
   }
 
+  /**
+   * Adds a new service to the DID Document and returns a new `BearerDid` instance with the updated document.
+   *
+   * @param service The service to add to the DID Document.
+   * @return A new `BearerDid` instance with the updated DID Document.
+   */
+  public fun addService(service: Service): BearerDid {
+    val updatedServices = document.service?.toMutableList() ?: mutableListOf()
+    updatedServices.add(service)
+    val updatedDocument = createUpdatedDocument(updatedServices)
+    return BearerDid(uri, did, keyManager, updatedDocument)
+  }
+
+
+  /**
+   * Creates a new `DidDocument` instance with the updated services.
+   *
+   * @param updatedServices The updated list of services to include in the DID Document.
+   * @return A new `DidDocument` instance with the updated services.
+   */
+  private fun createUpdatedDocument(updatedServices: List<Service>): DidDocument {
+    return DidDocument(
+      id = document.id,
+      verificationMethod = document.verificationMethod,
+      service = updatedServices,
+      authentication = document.authentication,
+      assertionMethod = document.assertionMethod,
+      keyAgreement = document.keyAgreement,
+      capabilityInvocation = document.capabilityInvocation,
+      capabilityDelegation = document.capabilityDelegation,
+      controller = document.controller,
+      alsoKnownAs = document.alsoKnownAs
+    )
+  }
+
   /**
    * Converts a `BearerDid` object to a portable format containing the URI and verification methods
    * associated with the DID.
diff --git a/dids/src/test/kotlin/web5/sdk/dids/did/BearerDidTest.kt b/dids/src/test/kotlin/web5/sdk/dids/did/BearerDidTest.kt
index d0965d2f5..a11cbb56a 100644
--- a/dids/src/test/kotlin/web5/sdk/dids/did/BearerDidTest.kt
+++ b/dids/src/test/kotlin/web5/sdk/dids/did/BearerDidTest.kt
@@ -1,6 +1,7 @@
 package web5.sdk.dids.did
 
 import org.junit.jupiter.api.Assertions.assertArrayEquals
+import org.junit.jupiter.api.Assertions.assertTrue
 import org.mockito.kotlin.any
 import org.mockito.kotlin.doReturn
 import org.mockito.kotlin.eq
@@ -8,6 +9,8 @@ import org.mockito.kotlin.spy
 import org.mockito.kotlin.verify
 import org.mockito.kotlin.whenever
 import web5.sdk.crypto.InMemoryKeyManager
+import web5.sdk.dids.didcore.Service
+import web5.sdk.dids.methods.dht.DidDht
 import web5.sdk.dids.methods.jwk.DidJwk
 import kotlin.test.Test
 import kotlin.test.assertEquals
@@ -15,6 +18,19 @@ import kotlin.test.assertNotNull
 
 class BearerDidTest {
 
+  @Test
+  fun `addService should add a new service to the DID Document`() {
+    val bearerDid = DidDht.create(InMemoryKeyManager())
+
+    val newService = Service(id = "service3", type = "ServiceType3", serviceEndpoint = listOf("https://endpoint3"))
+    val updatedBearerDid = bearerDid.addService(newService)
+
+    assertEquals(1, updatedBearerDid.document.service?.size)
+    assertTrue(updatedBearerDid.document.service?.any { it.id == "service3" } == true)
+  }
+
+
+
   @Test
   fun `getSigner should return a signer and verification method`() {
     val keyManager = spy(InMemoryKeyManager())