diff --git a/databricks/koalas/version.py b/databricks/koalas/version.py
index c054bd3008..730f1c9347 100644
--- a/databricks/koalas/version.py
+++ b/databricks/koalas/version.py
@@ -14,4 +14,4 @@
 # limitations under the License.
 #
 
-__version__ = '0.20.0'
+__version__ = '0.21.0'