diff --git a/.hgtags b/.hgtags
index fd18100baf..3872495840 100644
--- a/.hgtags
+++ b/.hgtags
@@ -20,3 +20,4 @@ cbb29e80df53eda3f162703aafb9a763e2732966 5.6.0
 8edd67fd2496e0fd0a9e25c6e066481c6b6641be 5.8.0
 84a70f1361acf303bb22ecc759a68c192cc43098 6.0.0
 8933f0f2e7654882f8dc0cc1f35ea093fc38b1f0 6.2.0
+3aabac6bc5531dea30c5079a2861355d9aa22b8a 6.4.0