diff --git a/.hgtags b/.hgtags
index ab526a9ec6..a1c99d197c 100644
--- a/.hgtags
+++ b/.hgtags
@@ -12,3 +12,4 @@ a032724e59322d6228f6759a5b2291f6f9cbd384 3.2.0
 bf04b1f359e06767115e7459294346a85db6b043 3.4.0
 d8c8bff3168e263bba6293740d9a846e90835832 3.6.0
 21618bdc05eed2f62d784d35458188a027ccfc71 3.8.0
+1c5317d89354d73bb46a1ac052b3eddd91dcb405 4.0.0