diff --git a/migrations/090_add_cert_updated_at.rb b/migrations/090_add_cert_updated_at.rb
new file mode 100644
index 00000000..746d9fed
--- /dev/null
+++ b/migrations/090_add_cert_updated_at.rb
@@ -0,0 +1,9 @@
+Sequel.migration do
+  up {
+    DB.add_column :sites, :cert_updated_at, Time
+  }
+
+  down {
+    DB.drop_column :sites, :cert_updated_at
+  }
+end