diff --git a/.hgtags b/.hgtags
index ff236f99a6..2f1e6bef8e 100644
--- a/.hgtags
+++ b/.hgtags
@@ -23,3 +23,4 @@ ca6cf2121b115188ca3af96578360379c5e036b8 5.6.0
 e9e6671a3d42396a786ca99bf49be2c9c5ee8580 5.8.0
 4810272d45a557c6b9e5beb316148e4a9ae9ee74 6.0.0
 90e37883946faa9c0db895f1183b91224f126c89 6.2.0
+dcf5f04524fe80f4b6e273c6e37ce4765dd1537b 6.4.0