diff --git a/maintainers/maintainer-list.nix b/maintainers/maintainer-list.nix
index c3b327893826..726cbd74313a 100644
--- a/maintainers/maintainer-list.nix
+++ b/maintainers/maintainer-list.nix
@@ -376,6 +376,11 @@
     github = "auntie";
     name = "Jonathan Glines";
   };
+  avery = {
+    email = "averyl+nixos@protonmail.com";
+    github = "AveryLychee";
+    name = "Avery Lychee";
+  };
   avnik = {
     email = "avn@avnik.info";
     github = "avnik";
diff --git a/pkgs/applications/office/treesheets/default.nix b/pkgs/applications/office/treesheets/default.nix
index d8e6cdd86ea9..d0a4953c426b 100644
--- a/pkgs/applications/office/treesheets/default.nix
+++ b/pkgs/applications/office/treesheets/default.nix
@@ -2,13 +2,13 @@
 
 stdenv.mkDerivation rec {
   name    = "treesheets-${version}";
-  version = "2017-03-27";
+  version = "2018-08-18";
 
   src = fetchFromGitHub {
     owner  = "aardappel";
     repo   = "treesheets";
-    rev    = "1d1d6b214e3ae88445eb1ec0032d5fef14160f32";
-    sha256 = "0np91c4skq3yxq76c4zi33w73qb1w2nrcin490kkvrxk53jspklb";
+    rev    = "3af41d99c8f9f32603a36ab64af3560b6d61dd73";
+    sha256 = "147y8ggh3clwjgsi15z8i4jnzlkh8p17mmlg532jym53zzbcva65";
   };
 
   buildInputs = [ wxGTK makeWrapper ];
@@ -49,7 +49,7 @@ stdenv.mkDerivation rec {
     '';
 
     homepage    = http://strlen.com/treesheets/;
-    maintainers = with maintainers; [ obadz ];
+    maintainers = with maintainers; [ obadz avery ];
     platforms   = platforms.linux;
     license     = licenses.zlib;
   };
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 84ad48079580..803640864c1d 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -19008,7 +19008,7 @@ with pkgs;
 
   tree = callPackage ../tools/system/tree {};
 
-  treesheets = callPackage ../applications/office/treesheets { wxGTK = wxGTK30; };
+  treesheets = callPackage ../applications/office/treesheets { wxGTK = wxGTK31; };
 
   trezor-bridge = callPackage ../applications/networking/browsers/mozilla-plugins/trezor { };