diff --git a/Sources/DIDCommSwift/Crypto/RecipientKeySelector.swift b/Sources/DIDCommSwift/Crypto/RecipientKeySelector.swift
index b822faa..a084d0b 100644
--- a/Sources/DIDCommSwift/Crypto/RecipientKeySelector.swift
+++ b/Sources/DIDCommSwift/Crypto/RecipientKeySelector.swift
@@ -36,7 +36,7 @@ struct RecipientKeySelector {
         
         let document = try await didResolver.resolve(did: didFrom.did)
         
-        guard let method = document.verificationMethods?.first(where: { $0.id == signFrom }) else {
+        guard let method = document.verificationMethod?.first(where: { $0.id == signFrom }) else {
             throw DIDCommError.verificationMethodNotFoundForId(signFrom)
         }
         
@@ -53,7 +53,7 @@ struct RecipientKeySelector {
         
         let document = try await didResolver.resolve(did: didFrom.did)
         
-        guard let method = document.verificationMethods?.first(where: { $0.id == from }) else {
+        guard let method = document.verificationMethod?.first(where: { $0.id == from }) else {
             throw DIDCommError.verificationMethodNotFoundForId(from)
         }
         
diff --git a/Sources/DIDCommSwift/Crypto/SenderKeySelector.swift b/Sources/DIDCommSwift/Crypto/SenderKeySelector.swift
index cfb1f12..24a32f5 100644
--- a/Sources/DIDCommSwift/Crypto/SenderKeySelector.swift
+++ b/Sources/DIDCommSwift/Crypto/SenderKeySelector.swift
@@ -107,7 +107,7 @@ struct SenderKeySelector {
         }
         let document = try await didResolver.resolve(did: didTo.did)
         if didTo.fragment != nil {
-            guard let verificationMethod = document.verificationMethods?.first(where: { $0.id == to }) else {
+            guard let verificationMethod = document.verificationMethod?.first(where: { $0.id == to }) else {
                 return []
             }
             return [try KeyHelper.fromVerificationMethod(method: verificationMethod)]
@@ -127,7 +127,7 @@ struct SenderKeySelector {
         }
         if didTo.fragment != nil {
             guard
-                let verificationMethod = document.verificationMethods?.first(where: { $0.id == to }),
+                let verificationMethod = document.verificationMethod?.first(where: { $0.id == to }),
                 let methodCurve = try? verificationMethod.getCurve(),
                 curve == methodCurve
             else {
@@ -150,7 +150,7 @@ extension DIDDocument {
         authentication?.map {
             switch $0 {
             case .stringValue(let value):
-                return verificationMethods?.first { $0.id == value }
+                return verificationMethod?.first { $0.id == value }
             case .verificationMethod(let method):
                 return method
             }
@@ -161,7 +161,7 @@ extension DIDDocument {
         keyAgreement?.map {
             switch $0 {
             case .stringValue(let value):
-                return verificationMethods?.first { $0.id == value }
+                return verificationMethod?.first { $0.id == value }
             case .verificationMethod(let method):
                 return method
             }
diff --git a/Tests/DIDCommSwiftTests/TestData/Mock/DIDAliceMockData.swift b/Tests/DIDCommSwiftTests/TestData/Mock/DIDAliceMockData.swift
index 5f6c720..c0b52a7 100644
--- a/Tests/DIDCommSwiftTests/TestData/Mock/DIDAliceMockData.swift
+++ b/Tests/DIDCommSwiftTests/TestData/Mock/DIDAliceMockData.swift
@@ -177,7 +177,7 @@ let aliceServiceRoutingKeys = AnyCodable(aliceServiceRoutingKeysDic)
 
 let didDocAliceSpecTestVectors = DIDDocument(
     id: "did:example:alice",
-    verificationMethods: [
+    verificationMethod: [
         aliceVerificationMethodKeyAgreeX25519,
         aliceVerificationMethodKeyAgreeP256,
         aliceVerificationMethodKeyAgreeP521,
@@ -200,7 +200,7 @@ let didDocAliceSpecTestVectors = DIDDocument(
 
 let didDocAliceSpecWithNoSecrets = DIDDocument(
     id: "did:example:alice",
-    verificationMethods: [
+    verificationMethod: [
         aliceVerificationMethodKeyAgreemX25519NotInSecret,
         aliceVerificationMethodKeyAgreeX25519,
         aliceVerificationMethodKeyAgreeP256,
@@ -223,7 +223,7 @@ let didDocAliceSpecWithNoSecrets = DIDDocument(
 
 let didDocAliceSpecRoutingTestVectors = DIDDocument(
     id: "did:example:alice",
-    verificationMethods: [
+    verificationMethod: [
         aliceVerificationMethodKeyAgreeX25519,
         aliceVerificationMethodKeyAgreeP256,
         aliceVerificationMethodKeyAgreeP521,
diff --git a/Tests/DIDCommSwiftTests/TestData/Mock/DIDBobMockData.swift b/Tests/DIDCommSwiftTests/TestData/Mock/DIDBobMockData.swift
index 93f4e3c..f18b248 100644
--- a/Tests/DIDCommSwiftTests/TestData/Mock/DIDBobMockData.swift
+++ b/Tests/DIDCommSwiftTests/TestData/Mock/DIDBobMockData.swift
@@ -446,7 +446,7 @@ let bobMediatorMultipleMediators = AnyCodable(dictionaryLiteral:
 
 let didDocBobTestVectors = DIDDocument(
     id: "did:example:bob",
-    verificationMethods: [
+    verificationMethod: [
         bobVerificationMethodKeyAgreeX25519_1,
         bobVerificationMethodKeyAgreeX25519_2,
         bobVerificationMethodKeyAgreeX25519_3,
@@ -484,7 +484,7 @@ let bobService = AnyCodable(dictionaryLiteral:
 
 let didDocBobWithNoSecrets = DIDDocument(
     id: "did:example:bob",
-    verificationMethods: [
+    verificationMethod: [
         bobVerificationMethodKeyAgreeX25519_1,
         bobVerificationMethodKeyAgreeX25519_2,
         bobVerificationMethodKeyAgreeX25519_3,
@@ -519,7 +519,7 @@ let didDocBobWithNoSecrets = DIDDocument(
 
 let didDocBobSpecRoutingTestVectors = DIDDocument(
     id: "did:example:bob",
-    verificationMethods: [
+    verificationMethod: [
         bobVerificationMethodKeyAgreeX25519_1,
         bobVerificationMethodKeyAgreeX25519_2,
         bobVerificationMethodKeyAgreeX25519_3,
@@ -535,7 +535,7 @@ let didDocBobSpecRoutingTestVectors = DIDDocument(
 
 let didDocBobSpecRoutingMediator1TestVectors = DIDDocument(
     id: "did:example:bobMediator1",
-    verificationMethods: [
+    verificationMethod: [
         bobMediator1VerificationMethodKeyAgreeX25519_1,
     ],
     authentication: [],
@@ -547,7 +547,7 @@ let didDocBobSpecRoutingMediator1TestVectors = DIDDocument(
 
 let didDocBobSpecRoutingMediator2TestVectors = DIDDocument(
     id: "did:example:bobMediator2",
-    verificationMethods: [
+    verificationMethod: [
         bobMediator2VerificationMethodKeyAgreeX25519_1,
     ],
     authentication: [],
@@ -559,7 +559,7 @@ let didDocBobSpecRoutingMediator2TestVectors = DIDDocument(
 
 let didDocBobSpecRoutingMediator3TestVectors = DIDDocument(
     id: "did:example:bobMediator3",
-    verificationMethods: [
+    verificationMethod: [
         bobMediator3VerificationMethodKeyAgreeX25519_1,
         bobMediator3VerificationMethodKeyAgreeP256_1,
     ],
diff --git a/Tests/DIDCommSwiftTests/TestData/Mock/DIDCharlieMockData.swift b/Tests/DIDCommSwiftTests/TestData/Mock/DIDCharlieMockData.swift
index 62f0657..4d8102c 100644
--- a/Tests/DIDCommSwiftTests/TestData/Mock/DIDCharlieMockData.swift
+++ b/Tests/DIDCommSwiftTests/TestData/Mock/DIDCharlieMockData.swift
@@ -98,7 +98,7 @@ let charlieServices1 = AnyCodable(dictionaryLiteral:
 
 let didDocCharlie = DIDDocument(
     id: "did:example:charlie",
-    verificationMethods: [
+    verificationMethod: [
         charlieVerificationMethodKeyAgreeX255191,
 //        charlieVerificationMethodKeyAgreeX255192,
 //        charlieVerificationMethodKeyAgreeX255193,