diff --git a/pkgs/applications/office/mytetra/default.nix b/pkgs/applications/office/mytetra/default.nix
index 5dae3c9f85c0..a7887357cd30 100644
--- a/pkgs/applications/office/mytetra/default.nix
+++ b/pkgs/applications/office/mytetra/default.nix
@@ -1,12 +1,12 @@
 { stdenv, fetchurl, qmake, qtsvg, makeWrapper, xdg_utils }:
 
 let
-  version = "1.43.27";
+  version = "1.44.55";
 in stdenv.mkDerivation rec {
   name = "mytetra-${version}";
   src = fetchurl {
     url = "https://github.com/xintrea/mytetra_dev/archive/v.${version}.tar.gz";
-    sha256 = "1gzr11jy1bvnp28w2ar3wmh76g55jn9nra5la5qasnal6b5pg28h";
+    sha256 = "13lmfvschm1xwr0ys2ykhs0bb83m2f39rk1jdd7zf8yxlqki4i6l";
   };
 
   nativeBuildInputs = [ qmake makeWrapper ];
@@ -15,11 +15,11 @@ in stdenv.mkDerivation rec {
   hardeningDisable = [ "format" ];
 
   preBuild = ''
-    substituteInPlace mytetra.pro \
+    substituteInPlace app/app.pro \
       --replace /usr/local/bin $out/bin \
       --replace /usr/share $out/share
 
-    substituteInPlace src/views/mainWindow/MainWindow.cpp \
+    substituteInPlace app/src/views/mainWindow/MainWindow.cpp \
       --replace ":/resource/pic/logo.svg" "$out/share/icons/hicolor/48x48/apps/mytetra.png"
   '';