diff --git a/src/drf_yasg/renderers.py b/src/drf_yasg/renderers.py
index 680201a..04c0c6a 100644
--- a/src/drf_yasg/renderers.py
+++ b/src/drf_yasg/renderers.py
@@ -1,5 +1,3 @@
-import warnings
-
 import six
 
 from django.shortcuts import render, resolve_url