diff --git a/.hgtags b/.hgtags
index 04340f6859..aa74ea837b 100644
--- a/.hgtags
+++ b/.hgtags
@@ -3,3 +3,4 @@ c0de6703f97f84cd221021f1f44ed097e7bf1953 5.6.0
 f9c333d590de0f4743309266c4aa9aa404b52133 5.8.0
 e3fe01c43846e4a19a484ab3287ff0cb32c57e9b 6.0.0
 d26cb551a7621f830314d72d6a2d24fa1106c284 6.2.0
+ad788f357511f5eb8e83f40035197fb592a4f60e 6.4.0