diff --git a/lib/rock_rms/error.rb b/lib/rock_rms/error.rb
index f40ac9d..f0396b9 100644
--- a/lib/rock_rms/error.rb
+++ b/lib/rock_rms/error.rb
@@ -34,9 +34,7 @@ def on_complete(env)
         raise RockRMS::ServiceUnavailable, error_message(env)
       when 504
         raise RockRMS::GatewayTimeout, error_message(env)
-      when 520
-        raise RockRMS::CloudflareError, error_message(env)
-      when 522
+      when 520, 521, 522
         raise RockRMS::CloudflareError, error_message(env)
       when ERROR_STATUSES
         raise RockRMS::Error, error_message(env)