diff -r a4de197218cf -r 00612a019547 hgext/simple4server.py
--- a/hgext/simple4server.py	Fri May 27 17:36:07 2016 +0200
+++ b/hgext/simple4server.py	Wed Jun 15 15:19:38 2016 -0700
@@ -13,6 +13,7 @@
 
 import mercurial.obsolete
 
+import hashlib
 import struct
 from mercurial import util
 from mercurial import wireproto
@@ -192,7 +193,7 @@
     for i in unfi:
         ctx = unfi[i]
         entry = 0
-        sha = util.sha1()
+        sha = hashlib.sha1()
         # add data from p1
         for p in ctx.parents():
             p = p.rev()