diff --git a/flask_smorest/__init__.py b/flask_smorest/__init__.py
index a24d27c1..22b105ed 100644
--- a/flask_smorest/__init__.py
+++ b/flask_smorest/__init__.py
@@ -7,7 +7,7 @@
 from .pagination import Page  # noqa
 from .error_handler import ErrorHandlerMixin
 
-__version__ = '0.20.0'
+__version__ = '0.21.0'
 
 
 class Api(APISpecMixin, ErrorHandlerMixin):
diff --git a/setup.cfg b/setup.cfg
index 56c32148..12f46efe 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 0.20.0
+current_version = 0.21.0
 commit = True
 tag = False
 
diff --git a/setup.py b/setup.py
index 79bf132c..e58d11ab 100644
--- a/setup.py
+++ b/setup.py
@@ -8,7 +8,7 @@
 
 setup(
     name='flask-smorest',
-    version='0.20.0',
+    version='0.21.0',
     description='Flask/Marshmallow-based REST API framework',
     long_description=long_description,
     url='https://github.com/marshmallow-code/flask-smorest',