diff --git a/databricks/koalas/version.py b/databricks/koalas/version.py
index 057f295072..983d768290 100644
--- a/databricks/koalas/version.py
+++ b/databricks/koalas/version.py
@@ -14,4 +14,4 @@
 # limitations under the License.
 #
 
-__version__ = "1.3.0"
+__version__ = "1.4.0"
diff --git a/docs/source/development/contributing.rst b/docs/source/development/contributing.rst
index 945939c021..758ef51f84 100644
--- a/docs/source/development/contributing.rst
+++ b/docs/source/development/contributing.rst
@@ -152,7 +152,7 @@ The chart below is the expected release dates of minor releases.
 +------------+---------+
 | Date       | Version |
 +============+=========+
-| 11/20 2020 | 1.4.0   |
+| 12/11 2020 | 1.5.0   |
 +------------+---------+
 
 Release Instructions