diff --git a/src/drf_yasg/codecs.py b/src/drf_yasg/codecs.py
index dad4e229..a5826edf 100644
--- a/src/drf_yasg/codecs.py
+++ b/src/drf_yasg/codecs.py
@@ -117,12 +117,12 @@ def _dump_dict(self, spec):
 
         :rtype: str"""
         if self.pretty:
-            out = json.dumps(spec, indent=4, separators=(',', ': '))
+            out = json.dumps(spec, indent=4, separators=(',', ': '), ensure_ascii=False)
             if out[-1] != '\n':
                 out += '\n'
             return out
         else:
-            return json.dumps(spec)
+            return json.dumps(spec, ensure_ascii=False)
 
 
 YAML_MAP_TAG = u'tag:yaml.org,2002:map'
@@ -199,7 +199,13 @@ def yaml_sane_dump(data, binary):
     :return: the serialized YAML
     :rtype: str or bytes
     """
-    return yaml.dump(data, Dumper=SaneYamlDumper, default_flow_style=False, encoding='utf-8' if binary else None)
+    return yaml.dump(
+        data,
+        Dumper=SaneYamlDumper,
+        default_flow_style=False,
+        encoding='utf-8' if binary else None,
+        allow_unicode=binary
+    )
 
 
 class SaneYamlLoader(yaml.SafeLoader):