diff --git a/.hgtags b/.hgtags
index 037f0a5b59..0b56fa2aab 100644
--- a/.hgtags
+++ b/.hgtags
@@ -4,3 +4,4 @@ e37a9b2291b9b60d453a9eabc894d21b5aeca097 5.6.0
 c3046a83c61339a6310b8cf56c2e4dddd59a0675 5.8.0
 0d2662846f667e44e2831a271becf86f8868c9a5 6.0.0
 5a39f9619caf2338d2b86a46f16154a8e29d2830 6.2.0
+b27e5df8f64e7e96c3b895ec7090eb1bb9166eaa 6.4.0