diff --git a/gwinc/test/ref_hash b/gwinc/test/ref_hash
index c5170040deb0cbb983eed01994a3cc7da40580cf..2cd1e0132f117830b7691ed781522973829e4cb9 100644
--- a/gwinc/test/ref_hash
+++ b/gwinc/test/ref_hash
@@ -1 +1 @@
-9ff4ba5463895698f48c243e329c4138ab163c1f
+a91cb8080dd3491958dacdefcf75e8e61c5e6013