diff --git a/lib/dockly.rb b/lib/dockly.rb
index 329fef0..00c5b81 100644
--- a/lib/dockly.rb
+++ b/lib/dockly.rb
@@ -63,8 +63,10 @@ def perform_role_assumption
     return if assume_role.nil?
     Aws.config.update(
       credentials: Aws::AssumeRoleCredentials.new(
-        role_arn: assume_role, role_session_name: 'dockly'
-      )
+        role_arn: assume_role, role_session_name: 'dockly',
+        client: Aws::STS::Client.new(region: aws_region)
+      ),
+      region: aws_region
     )
   end