diff --git a/.travis.yml b/.travis.yml
index 1d0f312..f5ae4a5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,8 +1,8 @@
 sudo: false
 
 rvm:
-  - "2.1"
-  - "2.2"
+  - "2.1.10"
+  - "2.2.10"
   - "2.3"
   - "2.4"
   - "2.5"
diff --git a/lib/aptible/api/stack.rb b/lib/aptible/api/stack.rb
index 59be846..174411f 100644
--- a/lib/aptible/api/stack.rb
+++ b/lib/aptible/api/stack.rb
@@ -17,6 +17,9 @@ class Stack < Resource
       field :ssh_portal_host
       field :ssh_portal_port
       field :organization_id
+      field :allow_c_instance_profile
+      field :allow_m_instance_profile
+      field :allow_r_instance_profile
       field :created_at, type: Time
       field :updated_at, type: Time