diff --git a/sources b/sources
index 0785c03..9822041 100644
--- a/sources
+++ b/sources
@@ -1 +1,2 @@
 SHA512 (version_2.2.0.tar.gz) = 5c8dc5b581e04208a1ae53771ef2607da189ee85aadf501ce1480008f5a6ddb10bb528ddc2608d3f04acd26c583ff895ad4148d6a1397f002292e20098971e1d
+SHA512 (version_2.3.1-rc.tar.gz) = 6aec947316981e37c3db74985bd6a071e666044837f299dd659c0ee4c5a9e302f280f8f7c71371210d50b00246bfa8fef342677a5bf0485929793eab93759def