add development_group to valid_keys

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/bundler/dsl.rb b/lib/bundler/dsl.rb
index 5cb3be02..f612c651 100644
--- a/lib/bundler/dsl.rb
+++ b/lib/bundler/dsl.rb
@@ -225,7 +225,7 @@ module Bundler
     end
 
     def valid_keys
-      @valid_keys ||= %w(group groups git path glob name branch ref tag require submodules platform platforms type source)
+      @valid_keys ||= %w(branch git glob group development_group groups name path platform platforms ref require source submodules tag type)
     end
 
     def normalize_options(name, version, opts)