diff --git a/.sync.yml b/.sync.yml
new file mode 100644
index 0000000..d35f212
--- /dev/null
+++ b/.sync.yml
@@ -0,0 +1,7 @@
+---
+Gemfile:
+  optional:
+    - gem: mime-types
+      version: '<2.0'
+spec/spec_helper.rb:
+  unmanaged: true