diff --git a/troposphere/ecs.py b/troposphere/ecs.py
index d5b7a0518..e4074e9a6 100644
--- a/troposphere/ecs.py
+++ b/troposphere/ecs.py
@@ -1,5 +1,7 @@
 from . import AWSObject, AWSProperty
-from .validators import boolean, integer, network_port, positive_integer
+from .validators import (
+    boolean, integer, network_port, positive_integer, ecs_proxy_type
+)
 
 
 LAUNCH_TYPE_EC2 = 'EC2'
@@ -215,10 +217,18 @@ class Ulimit(AWSProperty):
     }
 
 
+class ContainerDependency(AWSProperty):
+    props = {
+        'Condition': (basestring, True),
+        'ContainerName': (basestring, True)
+    }
+
+
 class ContainerDefinition(AWSProperty):
     props = {
         'Command': ([basestring], False),
         'Cpu': (positive_integer, False),
+        'DependsOn': (ContainerDependency, False),
         'DisableNetworking': (boolean, False),
         'DnsSearchDomains': ([basestring], False),
         'DnsServers': ([basestring], False),
@@ -242,6 +252,8 @@ class ContainerDefinition(AWSProperty):
         'Privileged': (boolean, False),
         'ReadonlyRootFilesystem': (boolean, False),
         'RepositoryCredentials': (RepositoryCredentials, False),
+        'StartTimeout': (integer, False),
+        'StopTimeout': (integer, False),
         'Ulimits': ([Ulimit], False),
         'User': (basestring, False),
         'VolumesFrom': ([VolumesFrom], False),
@@ -273,6 +285,13 @@ class Volume(AWSProperty):
     }
 
 
+class ProxyConfiguration(AWSProperty):
+    props = {
+        'ProxyConfigurationProperties': (dict, False),
+        'Type': (ecs_proxy_type, False)
+    }
+
+
 class TaskDefinition(AWSObject):
     resource_type = "AWS::ECS::TaskDefinition"
 
@@ -287,4 +306,5 @@ class TaskDefinition(AWSObject):
         'RequiresCompatibilities': ([basestring], False),
         'TaskRoleArn': (basestring, False),
         'Volumes': ([Volume], False),
+        'ProxyConfiguration': (ProxyConfiguration, False)
     }
diff --git a/troposphere/validators.py b/troposphere/validators.py
index cf7d35f12..b0e0594d1 100644
--- a/troposphere/validators.py
+++ b/troposphere/validators.py
@@ -473,3 +473,14 @@ def priceclass_type(price_class):
             )
         )
     return(price_class)
+
+
+def ecs_proxy_type(proxy_type):
+    valid_types = ['APPMESH']
+    if proxy_type not in valid_types:
+        raise ValueError(
+            'Type must be one of: "%s"' % (
+                ', '.join(valid_types)
+            )
+        )
+    return(proxy_type)