Avoid a bug in DRF v3.8.2

requirements.txt

@@ -5,7 +5,7 @@ django-filter>=1.1.0
 django-mptt>=0.9.0
 django-tables2>=1.19.0
 django-timezone-field>=2.0
-djangorestframework>=3.7.7
+djangorestframework>=3.7.7,<3.8.2
 drf-yasg[validation]>=1.4.4
 graphviz>=0.8.2
 Markdown>=2.6.11