diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,64 @@
 # Change Log
 
+## [1.4.0](https://github.com/brendanhay/amazonka/tree/1.4.0)
+Released: **21 March, 2016**, Compare: [1.4.0](https://github.com/brendanhay/amazonka/compare/1.3.7...1.4.0)
+
+### Fixed
+
+- Host header missing for presigned URLs. [\#264](https://github.com/brendanhay/amazonka/pull/264)
+- Set all API Gateway communication to `Accept: application/json`. [\#266](https://github.com/brendanhay/amazonka/pull/266)
+- Override EC2 `AttachmentStatus` to add `"available"`. [\#273](https://github.com/brendanhay/amazonka/pull/273) [\#275](https://github.com/brendanhay/amazonka/pull/275)
+- Allow EC2 `DeleteTags` to omit the tag value. [\#270](https://github.com/brendanhay/amazonka/pull/270)
+- Add `Hashable` instances for non-streaming types. [\#267](https://github.com/brendanhay/amazonka/pull/270)
+
+### Updated Service Definitions
+
+> The following services contain a large number (3 months worth) of definition updates.
+Please see the relevant libraries for specific changes:
+
+- API Gateway
+- AutoScaling
+- CloudFormation
+- CloudFront
+- CloudHSM
+- CloudSearchDomain
+- CloudWatch
+- CloudWatchLogs
+- CodeCommit
+- CodeDeploy
+- Config
+- DeviceFarm
+- DirectConnect
+- DirectoryService
+- DynamoDB
+- EC2
+- ECS
+- EMR
+- IAM
+- IoT
+- Lambda
+- Marketplace Analytics
+- OpsWorks
+- RDS
+- Redshift
+- Route53
+- S3
+- SES
+- SSM
+- STS
+- StorageGateway
+- Web Application Firewall
+
+### New Libraries
+
+- `amazonka-certificatemanager`: AWS Certificate Manager.
+- `amazonka-dms`: Database Migration Service.
+- `amazonka-ecr`: Elastic Container Registry.
+- `amazonka-cloudwatch-events`: CloudWatch Events.
+- `amazonka-gamelift`: Amazon GameLift.
+- `amazonka-marketplace-metering`: AWS Markpletplace Metering.
+
+
 ## [1.3.7](https://github.com/brendanhay/amazonka/tree/1.3.7)
 Released: **18 December, 2015**, Compare: [1.3.7](https://github.com/brendanhay/amazonka/compare/1.3.6...1.3.7)
 
@@ -14,7 +73,7 @@
 - The `AWS_PROFILE` environment variable can now be used to override the default
   file credentials location. [\#254](https://github.com/brendanhay/amazonka/issues/254)
 
-### Updated
+### Updated Service Definitions
 
 - AutoScaling: Updated service definition.
 - CloudFront: GZip support.
@@ -40,7 +99,7 @@
 - Fix S3 `BucketLocationConstraint` type de/serialisation. [\#249](https://github.com/brendanhay/amazonka/issues/249)
 - Fix S3 `PutBucketACL` header vs request body serialisation. [\#241](https://github.com/brendanhay/amazonka/issues/241)
 
-### Updated
+### Changes
 
 - `await` responses now indicate request fulfillment. [\#245](https://github.com/brendanhay/amazonka/issues/245)
 
diff --git a/amazonka.cabal b/amazonka.cabal
--- a/amazonka.cabal
+++ b/amazonka.cabal
@@ -1,5 +1,5 @@
 name:                  amazonka
-version:               1.3.7
+version:               1.4.0
 synopsis:              Comprehensive Amazon Web Services SDK.
 homepage:              https://github.com/brendanhay/amazonka
 bug-reports:           https://github.com/brendanhay/amazonka/issues
@@ -7,7 +7,7 @@
 license-file:          LICENSE
 author:                Brendan Hay
 maintainer:            Brendan Hay <brendan.g.hay@gmail.com>
-copyright:             Copyright (c) 2013-2015 Brendan Hay
+copyright:             Copyright (c) 2013-2016 Brendan Hay
 category:              Network, AWS, Cloud, Distributed Computing
 build-type:            Simple
 extra-source-files:    README.md CHANGELOG.md
@@ -55,7 +55,7 @@
         , Network.AWS.Internal.Logger
 
     build-depends:
-          amazonka-core       == 1.3.7.*
+          amazonka-core       == 1.4.0.*
         , base                >= 4.7     && < 5
         , bytestring          >= 0.9
         , conduit             >= 1.1
diff --git a/src/Control/Monad/Trans/AWS.hs b/src/Control/Monad/Trans/AWS.hs
--- a/src/Control/Monad/Trans/AWS.hs
+++ b/src/Control/Monad/Trans/AWS.hs
@@ -14,7 +14,7 @@
 
 -- |
 -- Module      : Control.Monad.Trans.AWS
--- Copyright   : (c) 2013-2015 Brendan Hay
+-- Copyright   : (c) 2013-2016 Brendan Hay
 -- License     : Mozilla Public License, v. 2.0.
 -- Maintainer  : Brendan Hay <brendan.g.hay@gmail.com>
 -- Stability   : provisional
diff --git a/src/Network/AWS.hs b/src/Network/AWS.hs
--- a/src/Network/AWS.hs
+++ b/src/Network/AWS.hs
@@ -6,7 +6,7 @@
 
 -- |
 -- Module      : Network.AWS
--- Copyright   : (c) 2013-2015 Brendan Hay
+-- Copyright   : (c) 2013-2016 Brendan Hay
 -- License     : Mozilla Public License, v. 2.0.
 -- Maintainer  : Brendan Hay <brendan.g.hay@gmail.com>
 -- Stability   : provisional
diff --git a/src/Network/AWS/Auth.hs b/src/Network/AWS/Auth.hs
--- a/src/Network/AWS/Auth.hs
+++ b/src/Network/AWS/Auth.hs
@@ -6,7 +6,7 @@
 
 -- |
 -- Module      : Network.AWS.Auth
--- Copyright   : (c) 2013-2015 Brendan Hay
+-- Copyright   : (c) 2013-2016 Brendan Hay
 -- License     : Mozilla Public License, v. 2.0.
 -- Maintainer  : Brendan Hay <brendan.g.hay@gmail.com>
 -- Stability   : provisional
diff --git a/src/Network/AWS/Data.hs b/src/Network/AWS/Data.hs
--- a/src/Network/AWS/Data.hs
+++ b/src/Network/AWS/Data.hs
@@ -1,6 +1,6 @@
 -- |
 -- Module      : Network.AWS.Data
--- Copyright   : (c) 2013-2015 Brendan Hay
+-- Copyright   : (c) 2013-2016 Brendan Hay
 -- License     : Mozilla Public License, v. 2.0.
 -- Maintainer  : Brendan Hay <brendan.g.hay@gmail.com>
 -- Stability   : provisional
diff --git a/src/Network/AWS/EC2/Metadata.hs b/src/Network/AWS/EC2/Metadata.hs
--- a/src/Network/AWS/EC2/Metadata.hs
+++ b/src/Network/AWS/EC2/Metadata.hs
@@ -6,7 +6,7 @@
 
 -- |
 -- Module      : Network.AWS.EC2.Metadata
--- Copyright   : (c) 2013-2015 Brendan Hay
+-- Copyright   : (c) 2013-2016 Brendan Hay
 -- License     : Mozilla Public License, v. 2.0.
 -- Maintainer  : Brendan Hay <brendan.g.hay@gmail.com>
 -- Stability   : provisional
diff --git a/src/Network/AWS/Env.hs b/src/Network/AWS/Env.hs
--- a/src/Network/AWS/Env.hs
+++ b/src/Network/AWS/Env.hs
@@ -6,7 +6,7 @@
 
 -- |
 -- Module      : Network.AWS.Env
--- Copyright   : (c) 2013-2015 Brendan Hay
+-- Copyright   : (c) 2013-2016 Brendan Hay
 -- License     : Mozilla Public License, v. 2.0.
 -- Maintainer  : Brendan Hay <brendan.g.hay@gmail.com>
 -- Stability   : provisional
diff --git a/src/Network/AWS/Internal/Body.hs b/src/Network/AWS/Internal/Body.hs
--- a/src/Network/AWS/Internal/Body.hs
+++ b/src/Network/AWS/Internal/Body.hs
@@ -2,7 +2,7 @@
 
 -- |
 -- Module      : Network.AWS.Internal.Body
--- Copyright   : (c) 2013-2015 Brendan Hay
+-- Copyright   : (c) 2013-2016 Brendan Hay
 -- License     : Mozilla Public License, v. 2.0.
 -- Maintainer  : Brendan Hay <brendan.g.hay@gmail.com>
 -- Stability   : provisional
diff --git a/src/Network/AWS/Internal/HTTP.hs b/src/Network/AWS/Internal/HTTP.hs
--- a/src/Network/AWS/Internal/HTTP.hs
+++ b/src/Network/AWS/Internal/HTTP.hs
@@ -9,7 +9,7 @@
 
 -- |
 -- Module      : Network.AWS.Internal.HTTP
--- Copyright   : (c) 2013-2015 Brendan Hay
+-- Copyright   : (c) 2013-2016 Brendan Hay
 -- License     : Mozilla Public License, v. 2.0.
 -- Maintainer  : Brendan Hay <brendan.g.hay@gmail.com>
 -- Stability   : provisional
diff --git a/src/Network/AWS/Internal/Logger.hs b/src/Network/AWS/Internal/Logger.hs
--- a/src/Network/AWS/Internal/Logger.hs
+++ b/src/Network/AWS/Internal/Logger.hs
@@ -2,7 +2,7 @@
 
 -- |
 -- Module      : Network.AWS.Internal.Logger
--- Copyright   : (c) 2013-2015 Brendan Hay
+-- Copyright   : (c) 2013-2016 Brendan Hay
 -- License     : Mozilla Public License, v. 2.0.
 -- Maintainer  : Brendan Hay <brendan.g.hay@gmail.com>
 -- Stability   : provisional
diff --git a/src/Network/AWS/Presign.hs b/src/Network/AWS/Presign.hs
--- a/src/Network/AWS/Presign.hs
+++ b/src/Network/AWS/Presign.hs
@@ -2,7 +2,7 @@
 
 -- |
 -- Module      : Network.AWS.Presign
--- Copyright   : (c) 2013-2015 Brendan Hay
+-- Copyright   : (c) 2013-2016 Brendan Hay
 -- License     : Mozilla Public License, v. 2.0.
 -- Maintainer  : Brendan Hay <brendan.g.hay@gmail.com>
 -- Stability   : provisional
diff --git a/test/Main.hs b/test/Main.hs
--- a/test/Main.hs
+++ b/test/Main.hs
@@ -1,5 +1,5 @@
 -- Module      : Main
--- Copyright   : (c) 2013-2015 Brendan Hay
+-- Copyright   : (c) 2013-2016 Brendan Hay
 -- License     : Mozilla Public License, v. 2.0.
 -- Maintainer  : Brendan Hay <brendan.g.hay@gmail.com>
 -- Stability   : experimental