diff --git a/git-remote-hg b/git-remote-hg
index 55fe01b..7af4b45 100755
--- a/git-remote-hg
+++ b/git-remote-hg
@@ -1075,7 +1075,11 @@ def push_unsafe(repo, remote, parsed_refs, p_revs):
     if not checkheads(repo, remote, p_revs):
         return None
 
-    if check_version(3, 2):
+    if check_version(4, 0):
+        from mercurial import exchange
+        outgoing = exchange._computeoutgoing(repo, list(p_revs), common)
+        cg = changegroup.getchangegroup(repo, 'push', outgoing)
+    elif check_version(3, 2):
         cg = changegroup.getchangegroup(repo, 'push', heads=list(p_revs), common=common)
     elif check_version(3, 0):
         cg = changegroup.getbundle(repo, 'push', heads=list(p_revs), common=common)