diff --git a/pkgs/applications/version-management/mercurial/default.nix b/pkgs/applications/version-management/mercurial/default.nix
index 8237a5517c7e..7b309233ca90 100644
--- a/pkgs/applications/version-management/mercurial/default.nix
+++ b/pkgs/applications/version-management/mercurial/default.nix
@@ -2,7 +2,7 @@
 , guiSupport ? false, tk ? null, curses }:
 
 let
-  version = "3.1";
+  version = "3.1.1";
   name = "mercurial-${version}";
 in
 
@@ -11,7 +11,7 @@ stdenv.mkDerivation {
 
   src = fetchurl {
     url = "http://mercurial.selenic.com/release/${name}.tar.gz";
-    sha256 = "1r6hdxka867lpsq2jq3vz662m3ywflg4yylayc9g0s9gmiww5pgi";
+    sha256 = "1ncqagvxcqa41ginmf0kpx2z6b2r2zrq7bdkza3nfba682c2is67";
   };
 
   inherit python; # pass it so that the same version can be used in hg2git