diff --git a/packages/callback-example/lib/__tests__/issuerCallback.spec.ts b/packages/callback-example/lib/__tests__/issuerCallback.spec.ts
index be203bd9..2a9aabe6 100644
--- a/packages/callback-example/lib/__tests__/issuerCallback.spec.ts
+++ b/packages/callback-example/lib/__tests__/issuerCallback.spec.ts
@@ -121,7 +121,7 @@ describe('issuerCallback', () => {
             {
               format: 'ldp_vc',
               credential_definition: {
-                types: ['VerifiableCredential'],
+                type: ['VerifiableCredential'],
                 '@context': ['https://www.w3.org/2018/credentials/v1'],
                 credentialSubject: {},
               },
diff --git a/packages/client/lib/CredentialRequestClient.ts b/packages/client/lib/CredentialRequestClient.ts
index 6918d477..33ad5488 100644
--- a/packages/client/lib/CredentialRequestClient.ts
+++ b/packages/client/lib/CredentialRequestClient.ts
@@ -104,14 +104,14 @@ export class CredentialRequestClient {
       return {
         types,
         format,
-        proof,
+        proof, // TODO Don't we need credential_definition here as well?
       };
     } else if (format === 'jwt_vc_json-ld' || format === 'ldp_vc') {
       return {
         format,
         proof,
         credential_definition: {
-          types,
+          type: types,
           // FIXME: this was not included in the original code, but it is required
           '@context': [],
         },
diff --git a/packages/client/lib/OpenID4VCIClient.ts b/packages/client/lib/OpenID4VCIClient.ts
index 77993c53..0471ab65 100644
--- a/packages/client/lib/OpenID4VCIClient.ts
+++ b/packages/client/lib/OpenID4VCIClient.ts
@@ -500,7 +500,7 @@ export class OpenID4VCIClient {
         } else if ('vct' in c) {
           return [c.vct];
       } else {
-        return c.credential_definition.types;
+        return c.credential_definition.type;
       }
     });
   }
diff --git a/packages/common/lib/functions/CredentialOfferUtil.ts b/packages/common/lib/functions/CredentialOfferUtil.ts
index 235ea56d..7e075d15 100644
--- a/packages/common/lib/functions/CredentialOfferUtil.ts
+++ b/packages/common/lib/functions/CredentialOfferUtil.ts
@@ -271,7 +271,7 @@ export function getTypesFromOffer(credentialOffer: UniformCredentialOfferPayload
     if (typeof curr === 'string') {
       return [...prev, curr];
     } else if (curr.format === 'jwt_vc_json-ld' || curr.format === 'ldp_vc') {
-      return [...prev, ...curr.credential_definition.types];
+      return [...prev, ...curr.credential_definition.type];
     } else if (curr.format === 'jwt_vc_json' || curr.format === 'jwt_vc') {
       return [...prev, ...curr.types];
     } else if (curr.format === 'vc+sd-jwt') {
diff --git a/packages/common/lib/functions/CredentialRequestUtil.ts b/packages/common/lib/functions/CredentialRequestUtil.ts
index 9eac981a..55ebbe66 100644
--- a/packages/common/lib/functions/CredentialRequestUtil.ts
+++ b/packages/common/lib/functions/CredentialRequestUtil.ts
@@ -5,7 +5,7 @@ export function getTypesFromRequest(credentialRequest: UniformCredentialRequest,
   if (credentialRequest.format === 'jwt_vc_json' || credentialRequest.format === 'jwt_vc') {
     types = credentialRequest.types;
   } else if (credentialRequest.format === 'jwt_vc_json-ld' || credentialRequest.format === 'ldp_vc') {
-    types = credentialRequest.credential_definition.types;
+    types = credentialRequest.credential_definition.type;
   } else if (credentialRequest.format === 'vc+sd-jwt') {
     types = [credentialRequest.vct];
   }
diff --git a/packages/common/lib/types/Generic.types.ts b/packages/common/lib/types/Generic.types.ts
index 50defbe6..06b82b51 100644
--- a/packages/common/lib/types/Generic.types.ts
+++ b/packages/common/lib/types/Generic.types.ts
@@ -185,7 +185,7 @@ export type CreateCredentialOfferURIResult = {
 
 export interface JsonLdIssuerCredentialDefinition {
   '@context': ICredentialContextType[];
-  types: string[];
+  type: string[];
   credentialSubject?: IssuerCredentialSubject;
 }
 
diff --git a/packages/issuer-rest/lib/__tests__/IssuerTokenServer.spec.ts b/packages/issuer-rest/lib/__tests__/IssuerTokenServer.spec.ts
index fde3285a..cbc600c2 100644
--- a/packages/issuer-rest/lib/__tests__/IssuerTokenServer.spec.ts
+++ b/packages/issuer-rest/lib/__tests__/IssuerTokenServer.spec.ts
@@ -49,7 +49,7 @@ describe('OID4VCIServer', () => {
               format: 'ldp_vc',
               credential_definition: {
                 '@context': ['test_context'],
-                types: ['VerifiableCredential'],
+                type: ['VerifiableCredential'],
                 credentialSubject: {},
               },
             },
diff --git a/packages/issuer/lib/__tests__/VcIssuer.spec.ts b/packages/issuer/lib/__tests__/VcIssuer.spec.ts
index c5e56954..e607c539 100644
--- a/packages/issuer/lib/__tests__/VcIssuer.spec.ts
+++ b/packages/issuer/lib/__tests__/VcIssuer.spec.ts
@@ -61,7 +61,7 @@ describe('VcIssuer', () => {
             {
               format: 'ldp_vc',
               credential_definition: {
-                types: ['VerifiableCredential'],
+                type: ['VerifiableCredential'],
                 '@context': ['https://www.w3.org/2018/credentials/v1'],
                 credentialSubject: {},
               },