diff --git a/server/services/OBPClientService.ts b/server/services/OBPClientService.ts
index 872e17a..9952c52 100644
--- a/server/services/OBPClientService.ts
+++ b/server/services/OBPClientService.ts
@@ -26,6 +26,7 @@
  */
 
 import { Service } from 'typedi'
+import { DEFAULT_OBP_API_VERSION } from '../../shared-constants'
 import {
   Version,
   API,
@@ -69,7 +70,7 @@ export default class OBPClientService {
     }
     this.clientConfig = {
       baseUri: process.env.VITE_OBP_API_HOST,
-      version: process.env.VITE_OBP_API_VERSION as Version,
+      version: (process.env.VITE_OBP_API_VERSION ?? DEFAULT_OBP_API_VERSION) as Version,
       oauthConfig: this.oauthConfig
     }
     
diff --git a/server/services/OBPConsentsService.ts b/server/services/OBPConsentsService.ts
index 9fb3c72..46f841c 100644
--- a/server/services/OBPConsentsService.ts
+++ b/server/services/OBPConsentsService.ts
@@ -5,6 +5,7 @@ import OauthInjectedService from './OauthInjectedService'
 import { AxiosResponse } from 'axios'
 import axios from 'axios'
 import { Session } from 'express-session'
+import { DEFAULT_OBP_API_VERSION } from '../../shared-constants'
 
 @Service()
 /**
@@ -79,7 +80,7 @@ export default class OBPConsentsService {
         // I.e. give permission to Opey to do anything on behalf of the logged in user
 
         // Get the Consents API client from the OBP SDK
-        const client = await this.createUserConsentsClient(session, `/obp/${process.env.VITE_OBP_API_VERSION}/my/consents/IMPLICIT`, 'POST')
+        const client = await this.createUserConsentsClient(session, `/obp/${process.env.VITE_OBP_API_VERSION ?? DEFAULT_OBP_API_VERSION}/my/consents/IMPLICIT`, 'POST')
         if (!client) {
             throw new Error('Could not create Consents API client')
         }
@@ -150,7 +151,7 @@ export default class OBPConsentsService {
         }
 
         try {
-            const response = await this._sendOBPRequest(`/obp/${process.env.VITE_OBP_API_VERSION}/user/current/consents/${consentId}`, 'GET', clientConfig)
+            const response = await this._sendOBPRequest(`/obp/${process.env.VITE_OBP_API_VERSION ?? DEFAULT_OBP_API_VERSION}/user/current/consents/${consentId}`, 'GET', clientConfig)
             
             session['opeyConfig'] = {
                 authConfig: {
@@ -182,7 +183,7 @@ export default class OBPConsentsService {
 
         // Get the Consents API client from the OBP SDK
         // The OBP SDK is messed up here, so we'll need to use Fetch until the SWAGGER WILL ACTUALLY WORK
-        // const client = await this.createUserConsentsClient(session, `/obp/${process.env.VITE_OBP_API_VERSION}/my/consents/IMPLICIT`, 'POST')
+        // const client = await this.createUserConsentsClient(session, `/obp/${process.env.VITE_OBP_API_VERSION ?? DEFAULT_OBP_API_VERSION}/my/consents/IMPLICIT`, 'POST')
         // if (!client) {
         //     throw new Error('Could not create Consents API client')
         // }
@@ -197,8 +198,8 @@ export default class OBPConsentsService {
 
         // We need to change this back to consent infos once OBP shows 'EXPIRED' in the status
         // Right now we have to check the JWT ourselves
-        const consentInfosPath = `/obp/${process.env.VITE_OBP_API_VERSION}/my/consents`
-        //const consentInfosPath = `/obp/${process.env.VITE_OBP_API_VERSION}/my/consent-infos`
+        const consentInfosPath = `/obp/${process.env.VITE_OBP_API_VERSION ?? DEFAULT_OBP_API_VERSION}/my/consents`
+        //const consentInfosPath = `/obp/${process.env.VITE_OBP_API_VERSION ?? DEFAULT_OBP_API_VERSION}/my/consent-infos`
 
         let opeyConsentId: string | null = null
         try {
diff --git a/shared-constants.ts b/shared-constants.ts
new file mode 100644
index 0000000..23405b7
--- /dev/null
+++ b/shared-constants.ts
@@ -0,0 +1,2 @@
+// DEFAULT_OBP_API_VERSION is used in case the environment variable VITE_OBP_API_VERSION is not set
+export const DEFAULT_OBP_API_VERSION = 'v6.0.0'
diff --git a/src/obp/index.ts b/src/obp/index.ts
index dd2b9eb..2171167 100644
--- a/src/obp/index.ts
+++ b/src/obp/index.ts
@@ -26,8 +26,9 @@
  */
 
 import superagent from 'superagent'
+import { DEFAULT_OBP_API_VERSION } from '../../shared-constants'
 
-export const OBP_API_VERSION = import.meta.env.VITE_OBP_API_VERSION
+export const OBP_API_VERSION = import.meta.env.VITE_OBP_API_VERSION ?? DEFAULT_OBP_API_VERSION
 export const OBP_API_DEFAULT_RESOURCE_DOC_VERSION = 
   (import.meta.env.VITE_OBP_API_DEFAULT_RESOURCE_DOC_VERSION ?? `OBP${OBP_API_VERSION}`)
 const default_collection_name = 'Favourites'