diff --git a/rest_framework/status.py b/rest_framework/status.py
index df0fa0f02..06d090733 100644
--- a/rest_framework/status.py
+++ b/rest_framework/status.py
@@ -37,6 +37,8 @@ HTTP_204_NO_CONTENT = 204
 HTTP_205_RESET_CONTENT = 205
 HTTP_206_PARTIAL_CONTENT = 206
 HTTP_207_MULTI_STATUS = 207
+HTTP_208_ALREADY_REPORTED = 208
+HTTP_226_IM_USED = 226
 HTTP_300_MULTIPLE_CHOICES = 300
 HTTP_301_MOVED_PERMANENTLY = 301
 HTTP_302_FOUND = 302
@@ -67,6 +69,7 @@ HTTP_417_EXPECTATION_FAILED = 417
 HTTP_422_UNPROCESSABLE_ENTITY = 422
 HTTP_423_LOCKED = 423
 HTTP_424_FAILED_DEPENDENCY = 424
+HTTP_426_UPGRADE_REQUIRED = 426
 HTTP_428_PRECONDITION_REQUIRED = 428
 HTTP_429_TOO_MANY_REQUESTS = 429
 HTTP_431_REQUEST_HEADER_FIELDS_TOO_LARGE = 431
@@ -77,5 +80,9 @@ HTTP_502_BAD_GATEWAY = 502
 HTTP_503_SERVICE_UNAVAILABLE = 503
 HTTP_504_GATEWAY_TIMEOUT = 504
 HTTP_505_HTTP_VERSION_NOT_SUPPORTED = 505
+HTTP_506_VARIANT_ALSO_NEGOTIATES = 506
 HTTP_507_INSUFFICIENT_STORAGE = 507
+HTTP_508_LOOP_DETECTED = 508
+HTTP_509_BANDWIDTH_LIMIT_EXCEEDED = 509
+HTTP_510_NOT_EXTENDED = 510
 HTTP_511_NETWORK_AUTHENTICATION_REQUIRED = 511