diff --git a/Build.PL b/Build.PL
index 10dd602..caa8cea 100644
--- a/Build.PL
+++ b/Build.PL
@@ -4,6 +4,8 @@ my $build = Module::Build->new
 	module_name 	=> 'Simba',
 	license		=> 'perl',
 	requires	=> {
+				Readonly => 0,
+				Digest::SHA1 => 0,
 			   },
 	script_files	=> [
 				'da',