diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -8,7 +8,7 @@
 
 ## Version
 
-`1.4.0`
+`1.4.1`
 
 
 ## Description
diff --git a/amazonka-lambda.cabal b/amazonka-lambda.cabal
--- a/amazonka-lambda.cabal
+++ b/amazonka-lambda.cabal
@@ -1,5 +1,5 @@
 name:                  amazonka-lambda
-version:               1.4.0
+version:               1.4.1
 synopsis:              Amazon Lambda SDK.
 homepage:              https://github.com/brendanhay/amazonka
 bug-reports:           https://github.com/brendanhay/amazonka/issues
@@ -81,7 +81,7 @@
         , Network.AWS.Lambda.Types.Sum
 
     build-depends:
-          amazonka-core == 1.4.0.*
+          amazonka-core == 1.4.1.*
         , base          >= 4.7     && < 5
 
 test-suite amazonka-lambda-test
@@ -101,9 +101,9 @@
         , Test.AWS.Lambda.Internal
 
     build-depends:
-          amazonka-core == 1.4.0.*
-        , amazonka-test == 1.4.0.*
-        , amazonka-lambda == 1.4.0.*
+          amazonka-core == 1.4.1.*
+        , amazonka-test == 1.4.1.*
+        , amazonka-lambda == 1.4.1.*
         , base
         , bytestring
         , tasty
diff --git a/gen/Network/AWS/Lambda/AddPermission.hs b/gen/Network/AWS/Lambda/AddPermission.hs
--- a/gen/Network/AWS/Lambda/AddPermission.hs
+++ b/gen/Network/AWS/Lambda/AddPermission.hs
@@ -43,6 +43,7 @@
     , AddPermission
     -- * Request Lenses
     , apSourceAccount
+    , apEventSourceToken
     , apSourceARN
     , apQualifier
     , apFunctionName
@@ -67,13 +68,14 @@
 
 -- | /See:/ 'addPermission' smart constructor.
 data AddPermission = AddPermission'
-    { _apSourceAccount :: !(Maybe Text)
-    , _apSourceARN     :: !(Maybe Text)
-    , _apQualifier     :: !(Maybe Text)
-    , _apFunctionName  :: !Text
-    , _apStatementId   :: !Text
-    , _apAction        :: !Text
-    , _apPrincipal     :: !Text
+    { _apSourceAccount    :: !(Maybe Text)
+    , _apEventSourceToken :: !(Maybe Text)
+    , _apSourceARN        :: !(Maybe Text)
+    , _apQualifier        :: !(Maybe Text)
+    , _apFunctionName     :: !Text
+    , _apStatementId      :: !Text
+    , _apAction           :: !Text
+    , _apPrincipal        :: !Text
     } deriving (Eq,Read,Show,Data,Typeable,Generic)
 
 -- | Creates a value of 'AddPermission' with the minimum fields required to make a request.
@@ -82,6 +84,8 @@
 --
 -- * 'apSourceAccount'
 --
+-- * 'apEventSourceToken'
+--
 -- * 'apSourceARN'
 --
 -- * 'apQualifier'
@@ -102,6 +106,7 @@
 addPermission pFunctionName_ pStatementId_ pAction_ pPrincipal_ =
     AddPermission'
     { _apSourceAccount = Nothing
+    , _apEventSourceToken = Nothing
     , _apSourceARN = Nothing
     , _apQualifier = Nothing
     , _apFunctionName = pFunctionName_
@@ -120,6 +125,10 @@
 apSourceAccount :: Lens' AddPermission (Maybe Text)
 apSourceAccount = lens _apSourceAccount (\ s a -> s{_apSourceAccount = a});
 
+-- | Undocumented member.
+apEventSourceToken :: Lens' AddPermission (Maybe Text)
+apEventSourceToken = lens _apEventSourceToken (\ s a -> s{_apEventSourceToken = a});
+
 -- | This is optional; however, when granting Amazon S3 permission to invoke
 -- your function, you should specify this field with the bucket Amazon
 -- Resource Name (ARN) as its value. This ensures that only events
@@ -196,6 +205,8 @@
 
 instance Hashable AddPermission
 
+instance NFData AddPermission
+
 instance ToHeaders AddPermission where
         toHeaders = const mempty
 
@@ -204,6 +215,7 @@
           = object
               (catMaybes
                  [("SourceAccount" .=) <$> _apSourceAccount,
+                  ("EventSourceToken" .=) <$> _apEventSourceToken,
                   ("SourceArn" .=) <$> _apSourceARN,
                   Just ("StatementId" .= _apStatementId),
                   Just ("Action" .= _apAction),
@@ -250,3 +262,5 @@
 -- | The response status code.
 aprsResponseStatus :: Lens' AddPermissionResponse Int
 aprsResponseStatus = lens _aprsResponseStatus (\ s a -> s{_aprsResponseStatus = a});
+
+instance NFData AddPermissionResponse
diff --git a/gen/Network/AWS/Lambda/CreateAlias.hs b/gen/Network/AWS/Lambda/CreateAlias.hs
--- a/gen/Network/AWS/Lambda/CreateAlias.hs
+++ b/gen/Network/AWS/Lambda/CreateAlias.hs
@@ -108,6 +108,8 @@
 
 instance Hashable CreateAlias
 
+instance NFData CreateAlias
+
 instance ToHeaders CreateAlias where
         toHeaders = const mempty
 
diff --git a/gen/Network/AWS/Lambda/CreateEventSourceMapping.hs b/gen/Network/AWS/Lambda/CreateEventSourceMapping.hs
--- a/gen/Network/AWS/Lambda/CreateEventSourceMapping.hs
+++ b/gen/Network/AWS/Lambda/CreateEventSourceMapping.hs
@@ -168,6 +168,8 @@
 
 instance Hashable CreateEventSourceMapping
 
+instance NFData CreateEventSourceMapping
+
 instance ToHeaders CreateEventSourceMapping where
         toHeaders = const mempty
 
diff --git a/gen/Network/AWS/Lambda/CreateFunction.hs b/gen/Network/AWS/Lambda/CreateFunction.hs
--- a/gen/Network/AWS/Lambda/CreateFunction.hs
+++ b/gen/Network/AWS/Lambda/CreateFunction.hs
@@ -201,6 +201,8 @@
 
 instance Hashable CreateFunction
 
+instance NFData CreateFunction
+
 instance ToHeaders CreateFunction where
         toHeaders = const mempty
 
diff --git a/gen/Network/AWS/Lambda/DeleteAlias.hs b/gen/Network/AWS/Lambda/DeleteAlias.hs
--- a/gen/Network/AWS/Lambda/DeleteAlias.hs
+++ b/gen/Network/AWS/Lambda/DeleteAlias.hs
@@ -82,6 +82,8 @@
 
 instance Hashable DeleteAlias
 
+instance NFData DeleteAlias
+
 instance ToHeaders DeleteAlias where
         toHeaders = const mempty
 
@@ -104,3 +106,5 @@
 deleteAliasResponse
     :: DeleteAliasResponse
 deleteAliasResponse = DeleteAliasResponse'
+
+instance NFData DeleteAliasResponse
diff --git a/gen/Network/AWS/Lambda/DeleteEventSourceMapping.hs b/gen/Network/AWS/Lambda/DeleteEventSourceMapping.hs
--- a/gen/Network/AWS/Lambda/DeleteEventSourceMapping.hs
+++ b/gen/Network/AWS/Lambda/DeleteEventSourceMapping.hs
@@ -82,6 +82,8 @@
 
 instance Hashable DeleteEventSourceMapping
 
+instance NFData DeleteEventSourceMapping
+
 instance ToHeaders DeleteEventSourceMapping where
         toHeaders = const mempty
 
diff --git a/gen/Network/AWS/Lambda/DeleteFunction.hs b/gen/Network/AWS/Lambda/DeleteFunction.hs
--- a/gen/Network/AWS/Lambda/DeleteFunction.hs
+++ b/gen/Network/AWS/Lambda/DeleteFunction.hs
@@ -114,6 +114,8 @@
 
 instance Hashable DeleteFunction
 
+instance NFData DeleteFunction
+
 instance ToHeaders DeleteFunction where
         toHeaders = const mempty
 
@@ -136,3 +138,5 @@
 deleteFunctionResponse
     :: DeleteFunctionResponse
 deleteFunctionResponse = DeleteFunctionResponse'
+
+instance NFData DeleteFunctionResponse
diff --git a/gen/Network/AWS/Lambda/GetAlias.hs b/gen/Network/AWS/Lambda/GetAlias.hs
--- a/gen/Network/AWS/Lambda/GetAlias.hs
+++ b/gen/Network/AWS/Lambda/GetAlias.hs
@@ -90,6 +90,8 @@
 
 instance Hashable GetAlias
 
+instance NFData GetAlias
+
 instance ToHeaders GetAlias where
         toHeaders = const mempty
 
diff --git a/gen/Network/AWS/Lambda/GetEventSourceMapping.hs b/gen/Network/AWS/Lambda/GetEventSourceMapping.hs
--- a/gen/Network/AWS/Lambda/GetEventSourceMapping.hs
+++ b/gen/Network/AWS/Lambda/GetEventSourceMapping.hs
@@ -82,6 +82,8 @@
 
 instance Hashable GetEventSourceMapping
 
+instance NFData GetEventSourceMapping
+
 instance ToHeaders GetEventSourceMapping where
         toHeaders = const mempty
 
diff --git a/gen/Network/AWS/Lambda/GetFunction.hs b/gen/Network/AWS/Lambda/GetFunction.hs
--- a/gen/Network/AWS/Lambda/GetFunction.hs
+++ b/gen/Network/AWS/Lambda/GetFunction.hs
@@ -114,6 +114,8 @@
 
 instance Hashable GetFunction
 
+instance NFData GetFunction
+
 instance ToHeaders GetFunction where
         toHeaders = const mempty
 
@@ -166,3 +168,5 @@
 -- | The response status code.
 gfrsResponseStatus :: Lens' GetFunctionResponse Int
 gfrsResponseStatus = lens _gfrsResponseStatus (\ s a -> s{_gfrsResponseStatus = a});
+
+instance NFData GetFunctionResponse
diff --git a/gen/Network/AWS/Lambda/GetFunctionConfiguration.hs b/gen/Network/AWS/Lambda/GetFunctionConfiguration.hs
--- a/gen/Network/AWS/Lambda/GetFunctionConfiguration.hs
+++ b/gen/Network/AWS/Lambda/GetFunctionConfiguration.hs
@@ -122,6 +122,8 @@
 
 instance Hashable GetFunctionConfiguration
 
+instance NFData GetFunctionConfiguration
+
 instance ToHeaders GetFunctionConfiguration where
         toHeaders = const mempty
 
diff --git a/gen/Network/AWS/Lambda/GetPolicy.hs b/gen/Network/AWS/Lambda/GetPolicy.hs
--- a/gen/Network/AWS/Lambda/GetPolicy.hs
+++ b/gen/Network/AWS/Lambda/GetPolicy.hs
@@ -109,6 +109,8 @@
 
 instance Hashable GetPolicy
 
+instance NFData GetPolicy
+
 instance ToHeaders GetPolicy where
         toHeaders = const mempty
 
@@ -153,3 +155,5 @@
 -- | The response status code.
 gprsResponseStatus :: Lens' GetPolicyResponse Int
 gprsResponseStatus = lens _gprsResponseStatus (\ s a -> s{_gprsResponseStatus = a});
+
+instance NFData GetPolicyResponse
diff --git a/gen/Network/AWS/Lambda/Invoke.hs b/gen/Network/AWS/Lambda/Invoke.hs
--- a/gen/Network/AWS/Lambda/Invoke.hs
+++ b/gen/Network/AWS/Lambda/Invoke.hs
@@ -169,6 +169,8 @@
 
 instance Hashable Invoke
 
+instance NFData Invoke
+
 instance ToBody Invoke where
         toBody = toBody . _iPayload
 
@@ -254,3 +256,5 @@
 -- 'DryRun' invocation type the status code will be 204.
 irsStatusCode :: Lens' InvokeResponse Int
 irsStatusCode = lens _irsStatusCode (\ s a -> s{_irsStatusCode = a});
+
+instance NFData InvokeResponse
diff --git a/gen/Network/AWS/Lambda/ListAliases.hs b/gen/Network/AWS/Lambda/ListAliases.hs
--- a/gen/Network/AWS/Lambda/ListAliases.hs
+++ b/gen/Network/AWS/Lambda/ListAliases.hs
@@ -115,6 +115,8 @@
 
 instance Hashable ListAliases
 
+instance NFData ListAliases
+
 instance ToHeaders ListAliases where
         toHeaders = const mempty
 
@@ -167,3 +169,5 @@
 -- | The response status code.
 larsResponseStatus :: Lens' ListAliasesResponse Int
 larsResponseStatus = lens _larsResponseStatus (\ s a -> s{_larsResponseStatus = a});
+
+instance NFData ListAliasesResponse
diff --git a/gen/Network/AWS/Lambda/ListEventSourceMappings.hs b/gen/Network/AWS/Lambda/ListEventSourceMappings.hs
--- a/gen/Network/AWS/Lambda/ListEventSourceMappings.hs
+++ b/gen/Network/AWS/Lambda/ListEventSourceMappings.hs
@@ -141,6 +141,8 @@
 
 instance Hashable ListEventSourceMappings
 
+instance NFData ListEventSourceMappings
+
 instance ToHeaders ListEventSourceMappings where
         toHeaders = const mempty
 
@@ -194,3 +196,5 @@
 -- | The response status code.
 lesmrsResponseStatus :: Lens' ListEventSourceMappingsResponse Int
 lesmrsResponseStatus = lens _lesmrsResponseStatus (\ s a -> s{_lesmrsResponseStatus = a});
+
+instance NFData ListEventSourceMappingsResponse
diff --git a/gen/Network/AWS/Lambda/ListFunctions.hs b/gen/Network/AWS/Lambda/ListFunctions.hs
--- a/gen/Network/AWS/Lambda/ListFunctions.hs
+++ b/gen/Network/AWS/Lambda/ListFunctions.hs
@@ -109,6 +109,8 @@
 
 instance Hashable ListFunctions
 
+instance NFData ListFunctions
+
 instance ToHeaders ListFunctions where
         toHeaders = const mempty
 
@@ -160,3 +162,5 @@
 -- | The response status code.
 lfrsResponseStatus :: Lens' ListFunctionsResponse Int
 lfrsResponseStatus = lens _lfrsResponseStatus (\ s a -> s{_lfrsResponseStatus = a});
+
+instance NFData ListFunctionsResponse
diff --git a/gen/Network/AWS/Lambda/ListVersionsByFunction.hs b/gen/Network/AWS/Lambda/ListVersionsByFunction.hs
--- a/gen/Network/AWS/Lambda/ListVersionsByFunction.hs
+++ b/gen/Network/AWS/Lambda/ListVersionsByFunction.hs
@@ -110,6 +110,8 @@
 
 instance Hashable ListVersionsByFunction
 
+instance NFData ListVersionsByFunction
+
 instance ToHeaders ListVersionsByFunction where
         toHeaders = const mempty
 
@@ -162,3 +164,5 @@
 -- | The response status code.
 lvbfrsResponseStatus :: Lens' ListVersionsByFunctionResponse Int
 lvbfrsResponseStatus = lens _lvbfrsResponseStatus (\ s a -> s{_lvbfrsResponseStatus = a});
+
+instance NFData ListVersionsByFunctionResponse
diff --git a/gen/Network/AWS/Lambda/PublishVersion.hs b/gen/Network/AWS/Lambda/PublishVersion.hs
--- a/gen/Network/AWS/Lambda/PublishVersion.hs
+++ b/gen/Network/AWS/Lambda/PublishVersion.hs
@@ -116,6 +116,8 @@
 
 instance Hashable PublishVersion
 
+instance NFData PublishVersion
+
 instance ToHeaders PublishVersion where
         toHeaders = const mempty
 
diff --git a/gen/Network/AWS/Lambda/RemovePermission.hs b/gen/Network/AWS/Lambda/RemovePermission.hs
--- a/gen/Network/AWS/Lambda/RemovePermission.hs
+++ b/gen/Network/AWS/Lambda/RemovePermission.hs
@@ -112,6 +112,8 @@
 
 instance Hashable RemovePermission
 
+instance NFData RemovePermission
+
 instance ToHeaders RemovePermission where
         toHeaders = const mempty
 
@@ -135,3 +137,5 @@
 removePermissionResponse
     :: RemovePermissionResponse
 removePermissionResponse = RemovePermissionResponse'
+
+instance NFData RemovePermissionResponse
diff --git a/gen/Network/AWS/Lambda/Types.hs b/gen/Network/AWS/Lambda/Types.hs
--- a/gen/Network/AWS/Lambda/Types.hs
+++ b/gen/Network/AWS/Lambda/Types.hs
@@ -144,6 +144,8 @@
       | has (hasCode "ThrottlingException" . hasStatus 400) e =
           Just "throttling_exception"
       | has (hasCode "Throttling" . hasStatus 400) e = Just "throttling"
+      | has (hasStatus 504) e = Just "gateway_timeout"
+      | has (hasStatus 502) e = Just "bad_gateway"
       | has (hasStatus 503) e = Just "service_unavailable"
       | has (hasStatus 500) e = Just "general_server_error"
       | has (hasStatus 509) e = Just "limit_exceeded"
diff --git a/gen/Network/AWS/Lambda/Types/Product.hs b/gen/Network/AWS/Lambda/Types/Product.hs
--- a/gen/Network/AWS/Lambda/Types/Product.hs
+++ b/gen/Network/AWS/Lambda/Types/Product.hs
@@ -83,6 +83,8 @@
 
 instance Hashable AliasConfiguration
 
+instance NFData AliasConfiguration
+
 -- | Describes mapping between an Amazon Kinesis stream and a Lambda
 -- function.
 --
@@ -186,6 +188,8 @@
 
 instance Hashable EventSourceMappingConfiguration
 
+instance NFData EventSourceMappingConfiguration
+
 -- | The code for the Lambda function.
 --
 -- /See:/ 'functionCode' smart constructor.
@@ -250,6 +254,8 @@
 
 instance Hashable FunctionCode
 
+instance NFData FunctionCode
+
 instance ToJSON FunctionCode where
         toJSON FunctionCode'{..}
           = object
@@ -300,6 +306,8 @@
 
 instance Hashable FunctionCodeLocation
 
+instance NFData FunctionCodeLocation
+
 -- | A complex type that describes function metadata.
 --
 -- /See:/ 'functionConfiguration' smart constructor.
@@ -445,6 +453,8 @@
 
 instance Hashable FunctionConfiguration
 
+instance NFData FunctionConfiguration
+
 -- | If your Lambda function accesses resources in a VPC, you provide this
 -- parameter identifying the list of security group IDs and subnet IDs.
 -- These must belong to the same VPC. You must provide at least one
@@ -481,6 +491,8 @@
 
 instance Hashable VPCConfig
 
+instance NFData VPCConfig
+
 instance ToJSON VPCConfig where
         toJSON VPCConfig'{..}
           = object
@@ -537,3 +549,5 @@
                      <*> (x .:? "VpcId"))
 
 instance Hashable VPCConfigResponse
+
+instance NFData VPCConfigResponse
diff --git a/gen/Network/AWS/Lambda/Types/Sum.hs b/gen/Network/AWS/Lambda/Types/Sum.hs
--- a/gen/Network/AWS/Lambda/Types/Sum.hs
+++ b/gen/Network/AWS/Lambda/Types/Sum.hs
@@ -37,6 +37,7 @@
         TrimHorizon -> "TRIM_HORIZON"
 
 instance Hashable     EventSourcePosition
+instance NFData       EventSourcePosition
 instance ToByteString EventSourcePosition
 instance ToQuery      EventSourcePosition
 instance ToHeader     EventSourcePosition
@@ -65,6 +66,7 @@
         RequestResponse -> "RequestResponse"
 
 instance Hashable     InvocationType
+instance NFData       InvocationType
 instance ToByteString InvocationType
 instance ToQuery      InvocationType
 instance ToHeader     InvocationType
@@ -90,6 +92,7 @@
         Tail -> "Tail"
 
 instance Hashable     LogType
+instance NFData       LogType
 instance ToByteString LogType
 instance ToQuery      LogType
 instance ToHeader     LogType
@@ -99,6 +102,7 @@
 
 data Runtime
     = JAVA8
+    | NODEJS4_3
     | Nodejs
     | PYTHON2_7
     deriving (Eq,Ord,Read,Show,Enum,Bounded,Data,Typeable,Generic)
@@ -106,18 +110,21 @@
 instance FromText Runtime where
     parser = takeLowerText >>= \case
         "java8" -> pure JAVA8
+        "nodejs4.3" -> pure NODEJS4_3
         "nodejs" -> pure Nodejs
         "python2.7" -> pure PYTHON2_7
         e -> fromTextError $ "Failure parsing Runtime from value: '" <> e
-           <> "'. Accepted values: java8, nodejs, python2.7"
+           <> "'. Accepted values: java8, nodejs4.3, nodejs, python2.7"
 
 instance ToText Runtime where
     toText = \case
         JAVA8 -> "java8"
+        NODEJS4_3 -> "nodejs4.3"
         Nodejs -> "nodejs"
         PYTHON2_7 -> "python2.7"
 
 instance Hashable     Runtime
+instance NFData       Runtime
 instance ToByteString Runtime
 instance ToQuery      Runtime
 instance ToHeader     Runtime
diff --git a/gen/Network/AWS/Lambda/UpdateAlias.hs b/gen/Network/AWS/Lambda/UpdateAlias.hs
--- a/gen/Network/AWS/Lambda/UpdateAlias.hs
+++ b/gen/Network/AWS/Lambda/UpdateAlias.hs
@@ -106,6 +106,8 @@
 
 instance Hashable UpdateAlias
 
+instance NFData UpdateAlias
+
 instance ToHeaders UpdateAlias where
         toHeaders = const mempty
 
diff --git a/gen/Network/AWS/Lambda/UpdateEventSourceMapping.hs b/gen/Network/AWS/Lambda/UpdateEventSourceMapping.hs
--- a/gen/Network/AWS/Lambda/UpdateEventSourceMapping.hs
+++ b/gen/Network/AWS/Lambda/UpdateEventSourceMapping.hs
@@ -139,6 +139,8 @@
 
 instance Hashable UpdateEventSourceMapping
 
+instance NFData UpdateEventSourceMapping
+
 instance ToHeaders UpdateEventSourceMapping where
         toHeaders = const mempty
 
diff --git a/gen/Network/AWS/Lambda/UpdateFunctionCode.hs b/gen/Network/AWS/Lambda/UpdateFunctionCode.hs
--- a/gen/Network/AWS/Lambda/UpdateFunctionCode.hs
+++ b/gen/Network/AWS/Lambda/UpdateFunctionCode.hs
@@ -156,6 +156,8 @@
 
 instance Hashable UpdateFunctionCode
 
+instance NFData UpdateFunctionCode
+
 instance ToHeaders UpdateFunctionCode where
         toHeaders = const mempty
 
diff --git a/gen/Network/AWS/Lambda/UpdateFunctionConfiguration.hs b/gen/Network/AWS/Lambda/UpdateFunctionConfiguration.hs
--- a/gen/Network/AWS/Lambda/UpdateFunctionConfiguration.hs
+++ b/gen/Network/AWS/Lambda/UpdateFunctionConfiguration.hs
@@ -38,6 +38,7 @@
     , UpdateFunctionConfiguration
     -- * Request Lenses
     , ufcMemorySize
+    , ufcRuntime
     , ufcRole
     , ufcVPCConfig
     , ufcHandler
@@ -74,6 +75,7 @@
 -- | /See:/ 'updateFunctionConfiguration' smart constructor.
 data UpdateFunctionConfiguration = UpdateFunctionConfiguration'
     { _ufcMemorySize   :: !(Maybe Nat)
+    , _ufcRuntime      :: !(Maybe Runtime)
     , _ufcRole         :: !(Maybe Text)
     , _ufcVPCConfig    :: !(Maybe VPCConfig)
     , _ufcHandler      :: !(Maybe Text)
@@ -88,6 +90,8 @@
 --
 -- * 'ufcMemorySize'
 --
+-- * 'ufcRuntime'
+--
 -- * 'ufcRole'
 --
 -- * 'ufcVPCConfig'
@@ -105,6 +109,7 @@
 updateFunctionConfiguration pFunctionName_ =
     UpdateFunctionConfiguration'
     { _ufcMemorySize = Nothing
+    , _ufcRuntime = Nothing
     , _ufcRole = Nothing
     , _ufcVPCConfig = Nothing
     , _ufcHandler = Nothing
@@ -122,6 +127,10 @@
 ufcMemorySize :: Lens' UpdateFunctionConfiguration (Maybe Natural)
 ufcMemorySize = lens _ufcMemorySize (\ s a -> s{_ufcMemorySize = a}) . mapping _Nat;
 
+-- | Undocumented member.
+ufcRuntime :: Lens' UpdateFunctionConfiguration (Maybe Runtime)
+ufcRuntime = lens _ufcRuntime (\ s a -> s{_ufcRuntime = a});
+
 -- | The Amazon Resource Name (ARN) of the IAM role that Lambda will assume
 -- when it executes your function.
 ufcRole :: Lens' UpdateFunctionConfiguration (Maybe Text)
@@ -168,6 +177,8 @@
 
 instance Hashable UpdateFunctionConfiguration
 
+instance NFData UpdateFunctionConfiguration
+
 instance ToHeaders UpdateFunctionConfiguration where
         toHeaders = const mempty
 
@@ -176,6 +187,7 @@
           = object
               (catMaybes
                  [("MemorySize" .=) <$> _ufcMemorySize,
+                  ("Runtime" .=) <$> _ufcRuntime,
                   ("Role" .=) <$> _ufcRole,
                   ("VpcConfig" .=) <$> _ufcVPCConfig,
                   ("Handler" .=) <$> _ufcHandler,