diff --git a/atmosphere/flows.py b/atmosphere/flows.py
index 77ba09b..43c254c 100644
--- a/atmosphere/flows.py
+++ b/atmosphere/flows.py
@@ -148,7 +148,9 @@
     if config.memcached.enabled:
         flow.add(
             openstack_helm.ApplyReleaseSecretTask(
-                namespace=constants.NAMESPACE_OPENSTACK, chart="memcached"
+                config=config,
+                namespace=constants.NAMESPACE_OPENSTACK,
+                chart="memcached",
             ),
             openstack_helm.ApplyHelmReleaseTask(
                 namespace=constants.NAMESPACE_OPENSTACK,
diff --git a/atmosphere/models/config.py b/atmosphere/models/config.py
index 20ad2ce..2e4c3bb 100644
--- a/atmosphere/models/config.py
+++ b/atmosphere/models/config.py
@@ -65,7 +65,9 @@
 
 
 class Config(base.Model):
-    memcached = types.ModelType(MemcachedConfig, required=True)
+    memcached = types.ModelType(
+        MemcachedConfig, default=MemcachedConfig(), required=True
+    )
     issuer = types.DictType(
         types.PolyModelType([AcmeIssuerConfig, SelfSignedIssuerConfig])
     )
diff --git a/atmosphere/models/openstack_helm/values.py b/atmosphere/models/openstack_helm/values.py
index afa3eab..b203239 100644
--- a/atmosphere/models/openstack_helm/values.py
+++ b/atmosphere/models/openstack_helm/values.py
@@ -13,7 +13,7 @@
     monitoring = types.ModelType(monitoring.Monitoring)
 
     class Options:
-        roles = {"default": blacklist("chart", "config")}
+        roles = {"default": blacklist("chart")}
 
     @classmethod
     def for_chart(cls, chart, config):
diff --git a/atmosphere/tasks/composite/openstack_helm.py b/atmosphere/tasks/composite/openstack_helm.py
index 5f329b9..7f189b1 100644
--- a/atmosphere/tasks/composite/openstack_helm.py
+++ b/atmosphere/tasks/composite/openstack_helm.py
@@ -10,14 +10,14 @@
 
 
 class ApplyReleaseSecretTask(v1.ApplySecretTask):
-    def __init__(self, namespace: str, chart: str, *args, **kwargs):
-        cfg = config.Config.load_from_file()
-        vals = values.Values.for_chart(chart, cfg)
-
-        data = values.to_native()
-        overrides = getattr(cfg, chart).overrides
-
-        vals = mergedeep.merge({}, data, overrides)
+    def __init__(
+        self, config: config.Config, namespace: str, chart: str, *args, **kwargs
+    ):
+        vals = mergedeep.merge(
+            {},
+            values.Values.for_chart(chart, config).to_native(),
+            getattr(config, chart).overrides,
+        )
         values_yaml = yaml.dump(vals, default_flow_style=False)
 
         super().__init__(