diff --git a/.travis.yml b/.travis.yml
index c2cb1952..e526e21a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,16 +4,16 @@ cache: pip
 # Favor explicit over implicit and use an explicit build matrix.
 matrix:
   allow_failures:
-    - env: TOXENV=py34-df20-django20-drfmaster
-    - env: TOXENV=py35-df20-django20-drfmaster
-    - env: TOXENV=py36-df20-django20-drfmaster
-    - env: TOXENV=py37-df20-django20-drfmaster
-    - env: TOXENV=py35-df20-django21-drfmaster
-    - env: TOXENV=py36-df20-django21-drfmaster
-    - env: TOXENV=py37-df20-django21-drfmaster
-    - env: TOXENV=py35-df20-django22-drfmaster
-    - env: TOXENV=py36-df20-django22-drfmaster
-    - env: TOXENV=py37-df20-django22-drfmaster
+    - env: TOXENV=py34-df21-django20-drfmaster
+    - env: TOXENV=py35-df21-django20-drfmaster
+    - env: TOXENV=py36-df21-django20-drfmaster
+    - env: TOXENV=py37-df21-django20-drfmaster
+    - env: TOXENV=py35-df21-django21-drfmaster
+    - env: TOXENV=py36-df21-django21-drfmaster
+    - env: TOXENV=py37-df21-django21-drfmaster
+    - env: TOXENV=py35-df21-django22-drfmaster
+    - env: TOXENV=py36-df21-django22-drfmaster
+    - env: TOXENV=py37-df21-django22-drfmaster
 
   include:
     - python: 3.6
@@ -29,94 +29,94 @@ matrix:
       env: TOXENV=py27-df11-django111-drf39
 
     - python: 3.4
-      env: TOXENV=py34-df20-django111-drf36
+      env: TOXENV=py34-df21-django111-drf36
     - python: 3.4
-      env: TOXENV=py34-df20-django111-drf37
+      env: TOXENV=py34-df21-django111-drf37
     - python: 3.4
-      env: TOXENV=py34-df20-django111-drf38
+      env: TOXENV=py34-df21-django111-drf38
     - python: 3.4
-      env: TOXENV=py34-df20-django20-drf37
+      env: TOXENV=py34-df21-django20-drf37
     - python: 3.4
-      env: TOXENV=py34-df20-django20-drf38
+      env: TOXENV=py34-df21-django20-drf38
     - python: 3.4
-      env: TOXENV=py34-df20-django20-drf39
+      env: TOXENV=py34-df21-django20-drf39
     - python: 3.4
-      env: TOXENV=py34-df20-django20-drfmaster
+      env: TOXENV=py34-df21-django20-drfmaster
 
     - python: 3.5
-      env: TOXENV=py35-df20-django111-drf36
+      env: TOXENV=py35-df21-django111-drf36
     - python: 3.5
-      env: TOXENV=py35-df20-django111-drf37
+      env: TOXENV=py35-df21-django111-drf37
     - python: 3.5
-      env: TOXENV=py35-df20-django111-drf38
+      env: TOXENV=py35-df21-django111-drf38
     - python: 3.5
-      env: TOXENV=py35-df20-django20-drf37
+      env: TOXENV=py35-df21-django20-drf37
     - python: 3.5
-      env: TOXENV=py35-df20-django20-drf38
+      env: TOXENV=py35-df21-django20-drf38
     - python: 3.5
-      env: TOXENV=py35-df20-django20-drf39
+      env: TOXENV=py35-df21-django20-drf39
     - python: 3.5
-      env: TOXENV=py35-df20-django20-drfmaster
+      env: TOXENV=py35-df21-django20-drfmaster
     - python: 3.5
-      env: TOXENV=py35-df20-django21-drf39
+      env: TOXENV=py35-df21-django21-drf39
     - python: 3.5
-      env: TOXENV=py35-df20-django21-drfmaster
+      env: TOXENV=py35-df21-django21-drfmaster
     - python: 3.5
       dist: xenial
-      env: TOXENV=py35-df20-django22-drf39
+      env: TOXENV=py35-df21-django22-drf39
     - python: 3.5
       dist: xenial
-      env: TOXENV=py35-df20-django22-drfmaster
+      env: TOXENV=py35-df21-django22-drfmaster
 
     - python: 3.6
-      env: TOXENV=py36-df20-django111-drf36
+      env: TOXENV=py36-df21-django111-drf36
     - python: 3.6
-      env: TOXENV=py36-df20-django111-drf37
+      env: TOXENV=py36-df21-django111-drf37
     - python: 3.6
-      env: TOXENV=py36-df20-django111-drf38
+      env: TOXENV=py36-df21-django111-drf38
     - python: 3.6
-      env: TOXENV=py36-df20-django20-drf37
+      env: TOXENV=py36-df21-django20-drf37
     - python: 3.6
-      env: TOXENV=py36-df20-django20-drf38
+      env: TOXENV=py36-df21-django20-drf38
     - python: 3.6
-      env: TOXENV=py36-df20-django20-drf39
+      env: TOXENV=py36-df21-django20-drf39
     - python: 3.6
-      env: TOXENV=py36-df20-django20-drfmaster
+      env: TOXENV=py36-df21-django20-drfmaster
     - python: 3.6
-      env: TOXENV=py36-df20-django21-drf39
+      env: TOXENV=py36-df21-django21-drf39
     - python: 3.6
-      env: TOXENV=py36-df20-django21-drfmaster
+      env: TOXENV=py36-df21-django21-drfmaster
     - python: 3.6
       dist: xenial
-      env: TOXENV=py36-df20-django22-drf39
+      env: TOXENV=py36-df21-django22-drf39
     - python: 3.6
       dist: xenial
-      env: TOXENV=py36-df20-django22-drfmaster
+      env: TOXENV=py36-df21-django22-drfmaster
 
     - python: 3.7
       dist: xenial
       sudo: required
-      env: TOXENV=py37-df20-django20-drf39
+      env: TOXENV=py37-df21-django20-drf39
     - python: 3.7
       dist: xenial
       sudo: required
-      env: TOXENV=py37-df20-django20-drfmaster
+      env: TOXENV=py37-df21-django20-drfmaster
     - python: 3.7
       dist: xenial
       sudo: required
-      env: TOXENV=py37-df20-django21-drf39
+      env: TOXENV=py37-df21-django21-drf39
     - python: 3.7
       dist: xenial
       sudo: required
-      env: TOXENV=py37-df20-django21-drfmaster
+      env: TOXENV=py37-df21-django21-drfmaster
     - python: 3.7
       dist: xenial
       sudo: required
-      env: TOXENV=py37-df20-django22-drf39
+      env: TOXENV=py37-df21-django22-drf39
     - python: 3.7
       dist: xenial
       sudo: required
-      env: TOXENV=py37-df20-django22-drfmaster
+      env: TOXENV=py37-df21-django22-drfmaster
 install:
   - pip install tox
 script:
diff --git a/tox.ini b/tox.ini
index 2ea9bad2..c73cd6b1 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,11 +1,11 @@
 [tox]
 envlist =
     py27-df11-django111-drf{36,37,38,39}
-    py{34,35,36}-df20-django111-drf{36,37,38,39,master},
-    py{34,35,36}-df20-django20-drf{37,38,39,master},
-    py37-df20-django20-drf{39,master},
-    py{35,36,37}-df20-django21-drf{39,master},
-    py{35,36,37}-df20-django22-drf{39,master},
+    py{34,35,36}-df21-django111-drf{36,37,38,39,master},
+    py{34,35,36}-df21-django20-drf{37,38,39,master},
+    py37-df21-django20-drf{39,master},
+    py{35,36,37}-df21-django21-drf{39,master},
+    py{35,36,37}-df21-django22-drf{39,master},
 
 [testenv]
 deps =
@@ -19,7 +19,7 @@ deps =
     drf39: djangorestframework>=3.9.0,<3.10
     drfmaster: https://github.com/encode/django-rest-framework/archive/master.zip
     df11: django-filter<=1.1
-    df20: django-filter>=2.0
+    df21: django-filter>=2.1
 
 setenv =
     PYTHONPATH = {toxinidir}