diff --git a/new_release b/new_release
index 916dbc9..63ebc37 100755
--- a/new_release
+++ b/new_release
@@ -1,5 +1,8 @@
 #!/bin/bash
 
 ## ./retrieve_changelog -r tag:0.7.1.. > ChangeLog
-python setup.py sdist
-gpg --armor --sign --detach-sig dist/*.tar.gz
+python setup.py sdist --formats=gztar,bztar
+tarballs=`ls dist`
+for tarball in ${tarballs}; do
+    gpg --armor --sign --detach-sig dist/${tarball} ;
+done