diff --git a/README.md b/README.md
index 364ecb9..eadd3e0 100644
--- a/README.md
+++ b/README.md
@@ -54,3 +54,9 @@ This Information has to be passed to the cell components dynamically which is on
 </app-cell>
 ```
 We can't pass it in an other form, else it would not be possible to pass a value, that is deeper in the data object than the first level (like insuranceData.billing), which is why the data has to be flattened to add it dynamically to a table or data-page.
+
+### Where to change the urls
+If the backend url changes, it has to be changed in the following files:
+- ./src/environments/
+- ./apollo.config.js for autocompletion when writing queries etc.
+- ./codegen.yml for graphQL codegen (to generate schema, types etc.)
\ No newline at end of file
diff --git a/apollo.config.js b/apollo.config.js
index 8cacc39..6b96e2c 100644
--- a/apollo.config.js
+++ b/apollo.config.js
@@ -3,7 +3,7 @@ module.exports = {
       excludes: ['src/generated/*'], // ignore the generated files
       service: {
         name: "flotte_project",
-        url: "http://173.212.197.169:4000/graphql"
+        url: "https://flotte.duckdns.org/graphqldev"
       }
     }
   };
\ No newline at end of file
diff --git a/codegen.yml b/codegen.yml
index 4c9fec3..43a3051 100644
--- a/codegen.yml
+++ b/codegen.yml
@@ -1,6 +1,6 @@
 overwrite: true
 watch: true
-schema: "http://173.212.197.169:4002/graphql"
+schema: "https://flotte.duckdns.org/graphqldev"
 documents: "src/app/graphqlOperations/**/*.graphql"
 generates:
   src/generated/graphql.ts:
diff --git a/src/app/graphqlOperations/fragments/person.graphql b/src/app/graphqlOperations/fragments/person.graphql
index 4e07d1c..2675510 100644
--- a/src/app/graphqlOperations/fragments/person.graphql
+++ b/src/app/graphqlOperations/fragments/person.graphql
@@ -1,10 +1,9 @@
 fragment PersonFields on Person {
-    id
-    name
-    firstName
-
-    isLocked
+  id
+  name
+  firstName
+  isLocked
   isLockedByMe
   lockedBy
   lockedUntil
-}
\ No newline at end of file
+}
diff --git a/src/environments/environment.prod.ts b/src/environments/environment.prod.ts
index b2749c6..204d624 100644
--- a/src/environments/environment.prod.ts
+++ b/src/environments/environment.prod.ts
@@ -1,5 +1,5 @@
 export const environment = {
   production: true,
-  apiUrl: "http://173.212.197.169:4000",
-  authUrl: "http://173.212.197.169:8080"
+  apiUrl: "https://flotte.duckdns.org/graphql", // graphql api url
+  authUrl: "https://flotte.duckdns.org/user-management" // user server url 
 };