diff --git a/pkgs/applications/audio/seq66/default.nix b/pkgs/applications/audio/seq66/default.nix
index 8f47ab0b6a20..51d40f962a88 100644
--- a/pkgs/applications/audio/seq66/default.nix
+++ b/pkgs/applications/audio/seq66/default.nix
@@ -4,13 +4,13 @@
 
 stdenv.mkDerivation rec {
   pname = "seq66";
-  version = "0.90.5";
+  version = "0.99.12";
 
   src = fetchFromGitHub {
     owner = "ahlstromcj";
-    repo = pname;
+    repo = "seq66";
     rev = version;
-    sha256 = "1jvra1wzlycfpvffnqidk264zw6fyl4fsghkw5256ldk22aalmq9";
+    hash = "sha256-+EU0UdmZaDnhN142yR/r0tK1FKBbuFPmde6iSS26Tjo=";
   };
 
   nativeBuildInputs = [ autoreconfHook pkg-config qttools which wrapQtAppsHook ];
@@ -18,13 +18,9 @@ stdenv.mkDerivation rec {
   buildInputs = [ alsa-lib libjack2 liblo qtbase ];
 
   postPatch = ''
-    for d in libseq66/include libseq66/src libsessions/include libsessions/src seq_qt5/src seq_rtmidi/include seq_rtmidi/src Seqtool/src; do
-      substituteInPlace "$d/Makefile.am" --replace '$(git_info)' '${version}'
+    for d in libseq66/src libsessions/include libsessions/src seq_qt5/src seq_rtmidi/src; do
+      substituteInPlace "$d/Makefile.am" --replace-fail '$(git_info)' '${version}'
     done
-
-    # gcc-13 headers compatibilty. TODO: try to remove with next version
-    # update
-    sed -e '1i #include <cstdint>' -i libseq66/src/os/daemonize.cpp
   '';
 
   enableParallelBuilding = true;