diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6ab062e..5420959 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Changelog
 
+## 21.12.0 (2021-12-30)
+
+### Features
+
+* [#253](https://github.com/sanic-org/sanic-openapi/pull/253) - Sanic v21.12.0 Support
 
 ## 21.3.2 (2021-05-19)
 
diff --git a/sanic_openapi/__init__.py b/sanic_openapi/__init__.py
index 23a4639..0693490 100644
--- a/sanic_openapi/__init__.py
+++ b/sanic_openapi/__init__.py
@@ -3,7 +3,7 @@
 
 swagger_blueprint = openapi2_blueprint
 
-__version__ = "21.6.1"
+__version__ = "21.12.0"
 __all__ = [
     "openapi2_blueprint",
     "swagger_blueprint",
diff --git a/tests/conftest.py b/tests/conftest.py
index 22bc175..8210251 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -14,9 +14,6 @@ def app():
     app.blueprint(openapi2_blueprint)
     yield app
 
-    # Clean up
-    openapi2_blueprint.definitions = {}
-
 
 @pytest.fixture()
 def app3():
diff --git a/tox.ini b/tox.ini
index 0f4c7ac..5b05640 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = {py37,py38,py39}-sanic{20.12, 21.6}, check
+envlist = {py37,py38,py39}-sanic{20.12, 21.6, 21.12}, check
 
 
 [gh-actions]
@@ -13,6 +13,8 @@ deps =
     sanic20.12: sanic==20.12
     sanic21.6: sanic==21.6
     sanic21.6: sanic_testing
+    sanic21.12: sanic==21.12
+    sanic21.12: sanic_testing
 
 commands =
     pip install -e .['test']