diff --git a/.codegen.json b/.codegen.json
index ae8482e..65cecb0 100644
--- a/.codegen.json
+++ b/.codegen.json
@@ -1 +1 @@
-{ "engineHash": "5ceb679", "specHash": "d9f90b8", "version": "1.5.0" }
+{ "engineHash": "754a5b2", "specHash": "d9f90b8", "version": "1.5.0" }
diff --git a/box_sdk_gen/networking/network.py b/box_sdk_gen/networking/network.py
index b0f2de8..7a8cbc6 100644
--- a/box_sdk_gen/networking/network.py
+++ b/box_sdk_gen/networking/network.py
@@ -64,7 +64,7 @@ def with_proxy(self, config: ProxyConfig) -> 'NetworkSession':
         proxy_auth = (
             f'{config.username}:{config.password}@'
             if config.username and config.password
-            else None
+            else ''
         )
         proxy_url = f'http://{proxy_auth}{proxy_host}'
         return NetworkSession(self.additional_headers, self.base_urls, proxy_url)