diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3ada20f245..e28ce4d088 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,17 @@
+### 0.21.6
+###### Features
+- Remove rule [W2507](https://github.com/aws-cloudformation/cfn-python-lint/blob/master/docs/rules.md#W2507) and use rule [E3008](https://github.com/aws-cloudformation/cfn-python-lint/blob/master/docs/rules.md#E3008) instead
+- Remove rule [W2508](https://github.com/aws-cloudformation/cfn-python-lint/blob/master/docs/rules.md#W2508) and use rule [E3008](https://github.com/aws-cloudformation/cfn-python-lint/blob/master/docs/rules.md#E3008) instead
+###### CloudFormation Specifications
+- Update specs to 3.4.0
+- Add all the allowed values of the AWS::ECS Resources.
+- Update CloudFormation Spec to include the Backup Resources
+- Add Cognito RefreshTokenValidity number limits
+###### Fixes
+- Fix copy-paste typo in Not function check
+- Don't fail when conditions are used with parameters and allowed values
+- More IAM Resource exceptions for Sub Needed check
+
 ### 0.21.5
 ###### Features
 - Update rule [E3001](https://github.com/aws-cloudformation/cfn-python-lint/blob/master/docs/rules.md#E3001) to validate that a Resource Condition is a string
diff --git a/README.md b/README.md
index 3869d9205b..98f77f88cc 100644
--- a/README.md
+++ b/README.md
@@ -209,7 +209,7 @@ If you'd like cfn-lint to be run automatically when making changes to files in y
 ```yaml
 repos:
 -   repo: https://github.com/aws-cloudformation/cfn-python-lint
-    rev: v0.21.5  # The version of cfn-lint to use
+    rev: v0.21.6  # The version of cfn-lint to use
     hooks:
     -   id: cfn-python-lint
         files: path/to/cfn/dir/.*\.(json|yml|yaml)$
diff --git a/src/cfnlint/version.py b/src/cfnlint/version.py
index 64364f64cb..6444c19201 100644
--- a/src/cfnlint/version.py
+++ b/src/cfnlint/version.py
@@ -15,4 +15,4 @@
   SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 """
 
-__version__ = '0.21.5'
+__version__ = '0.21.6'