diff --git a/frontend/app/src/environments/environment.production.ts b/frontend/app/src/environments/environment.production.ts
index 2aa4b914..f5c55261 100644
--- a/frontend/app/src/environments/environment.production.ts
+++ b/frontend/app/src/environments/environment.production.ts
@@ -21,7 +21,7 @@ export const environment = {
   backend_url: 'https://mobile.server.uni-frankfurt.de',
   app_host: 'mobile.app.uni-frankfurt.de',
   custom_url_scheme: 'de.anyschool.app',
-  backend_version: '4.1.0',
+  backend_version: '3.1.0',
   production: true,
 };
 
diff --git a/frontend/app/src/environments/environment.ts b/frontend/app/src/environments/environment.ts
index b7aa5441..d112dcef 100644
--- a/frontend/app/src/environments/environment.ts
+++ b/frontend/app/src/environments/environment.ts
@@ -21,7 +21,7 @@ export const environment = {
   backend_url: 'https://mobile.server.uni-frankfurt.de',
   app_host: 'mobile.app.uni-frankfurt.de',
   custom_url_scheme: 'de.anyschool.app',
-  backend_version: '4.1.0',
+  backend_version: '3.1.0',
   production: false,
 };