diff --git a/ruby.spec b/ruby.spec
index c0d977c..55e203c 100644
--- a/ruby.spec
+++ b/ruby.spec
@@ -182,6 +182,7 @@ License:    Ruby or MIT
 Requires:   ruby(abi) = %{ruby_abi}
 Requires:   rubygem(rdoc) >= %{rdoc_version}
 Requires:   rubygem(io-console) >= %{io_console_version}
+Requires:   rubygem(psych) >= %{psych_version}
 Provides:   gem = %{version}-%{release}
 Provides:   ruby(rubygems) = %{version}-%{release}
 BuildArch:  noarch