diff --git a/.hgtags b/.hgtags
index 7c2c4efd56..4e2c6f2215 100644
--- a/.hgtags
+++ b/.hgtags
@@ -8,3 +8,4 @@ a1a6a82f29e5dd64eb98171605b65928a9665545 5.4.0
 a6770538fc965a9d969495821109ae4a557be8d2 5.8.0
 a715a010e9d49dcb76c93653b28002ab501b6c44 6.0.0
 e7019abd475b72c4c4a0be309338620c70681748 6.2.0
+7ec1c0a6a03a8068da9af234543dfd84d87c53b3 6.4.0