diff --git a/pkgs/by-name/op/opencascade-occt/package.nix b/pkgs/by-name/op/opencascade-occt/package.nix
index 72f84459a5f40..171ae1a81acab 100644
--- a/pkgs/by-name/op/opencascade-occt/package.nix
+++ b/pkgs/by-name/op/opencascade-occt/package.nix
@@ -1,7 +1,7 @@
 {
   lib,
   stdenv,
-  fetchurl,
+  fetchFromGitHub,
   fetchpatch,
   cmake,
   ninja,
@@ -15,34 +15,34 @@
   libXi,
   vtk,
   withVtk ? false,
-
-  # used in passthru.tests
   opencascade-occt,
 }:
-stdenv.mkDerivation rec {
+stdenv.mkDerivation (finalAttrs: {
   pname = "opencascade-occt";
-  version = "7.8.1";
-  commit = "V${builtins.replaceStrings [ "." ] [ "_" ] version}";
+  version = "7.9.3";
 
-  src = fetchurl {
-    name = "occt-${commit}.tar.gz";
-    url = "https://git.dev.opencascade.org/gitweb/?p=occt.git;a=snapshot;h=${commit};sf=tgz";
-    hash = "sha256-AGMZqTLLjXbzJFW/RSTsohAGV8sMxlUmdU/Y2oOzkk8=";
+  src = fetchFromGitHub {
+    owner = "Open-Cascade-SAS";
+    repo = "OCCT";
+    tag = "V${builtins.replaceStrings [ "." ] [ "_" ] finalAttrs.version}";
+    hash = "sha256-Zp4m+f1wrzynoCrzIwvYELUXsY/NQIBY+HFk5UteufI=";
   };
 
-  patches = [
+  patches = lib.optionals (lib.versionOlder finalAttrs.version "7.9") [
     # fix compilation on darwin against latest version of freetype
     # https://gitlab.freedesktop.org/freetype/freetype/-/merge_requests/330
     (fetchpatch {
       url = "https://github.com/Open-Cascade-SAS/OCCT/commit/7236e83dcc1e7284e66dc61e612154617ef715d6.diff";
       hash = "sha256-NoC2mE3DG78Y0c9UWonx1vmXoU4g5XxFUT3eVXqLU60=";
     })
-
-    # patch does not apply against 7.9+, it was submitted upstream for future
-    # inclusion: https://github.com/Open-Cascade-SAS/OCCT/pull/683
-    ./vtk-draw-conditional-glx.patch
   ];
 
+  # Exclude TKIVtkDraw toolkits cause VTK has no glx support on darwin
+  postPatch = lib.optionalString (withVtk && stdenv.hostPlatform.isDarwin) ''
+    substituteInPlace adm/MODULES \
+      --replace-fail "TKIVtkDraw" ""
+  '';
+
   nativeBuildInputs = [
     cmake
     ninja
@@ -89,4 +89,4 @@ stdenv.mkDerivation rec {
     maintainers = with lib.maintainers; [ amiloradovsky ];
     platforms = lib.platforms.all;
   };
-}
+})
diff --git a/pkgs/by-name/op/opencascade-occt/vtk-draw-conditional-glx.patch b/pkgs/by-name/op/opencascade-occt/vtk-draw-conditional-glx.patch
deleted file mode 100644
index 76993ae6046fc..0000000000000
--- a/pkgs/by-name/op/opencascade-occt/vtk-draw-conditional-glx.patch
+++ /dev/null
@@ -1,14 +0,0 @@
-diff --git a/CMakeLists.txt b/CMakeLists.txt
-index 86905287dc..19214e8f2d 100644
---- a/CMakeLists.txt
-+++ b/CMakeLists.txt
-@@ -623,5 +623,9 @@ if (USE_VTK)
-   add_definitions (-DHAVE_VTK)
-   set (OCCT_VTK_USED_TARGETS "" CACHE INTERNAL "" FORCE)
-   OCCT_INCLUDE_CMAKE_FILE ("adm/cmake/vtk")
-+  if (DEFINED VTK_USE_X AND NOT VTK_USE_X)
-+      message (STATUS "Info: TKIVtkDraw toolkits excluded due to VTK has no glx support")
-+      list (REMOVE_ITEM BUILD_TOOLKITS TKIVtkDraw)
-+  endif()
- else()
-   OCCT_CHECK_AND_UNSET_GROUP ("3RDPARTY_VTK")
diff --git a/pkgs/development/python-modules/pythonocc-core/default.nix b/pkgs/development/python-modules/pythonocc-core/default.nix
index 93684b2441c74..9b441a73b8990 100644
--- a/pkgs/development/python-modules/pythonocc-core/default.nix
+++ b/pkgs/development/python-modules/pythonocc-core/default.nix
@@ -17,16 +17,16 @@
   rapidjson,
   swig,
 }:
-
-stdenv.mkDerivation rec {
+stdenv.mkDerivation (finalAttrs: {
   pname = "pythonocc-core";
-  version = "7.8.1.1";
+  # To avoid overriding opencascade-occt from 7.9.3 to 7.9.0. Go back to regular release next version.
+  version = "7.9.0-unstable-2025-12-31";
 
   src = fetchFromGitHub {
     owner = "tpaviot";
     repo = "pythonocc-core";
-    tag = version;
-    hash = "sha256-0o2PQEN0/Z7FUPZEo2HxFFa+mN2bZnYI++HVu4ONpNA=";
+    rev = "2f8f1a7d99312e8b3e81d0bb2adab9b1e717d37b";
+    hash = "sha256-fni6crPs58e8MUr2SfVHVD5nPFIEQcOfuAMLXJlWg88=";
   };
 
   nativeBuildInputs = [
@@ -63,9 +63,9 @@ stdenv.mkDerivation rec {
   meta = {
     description = "Python wrapper for the OpenCASCADE 3D modeling kernel";
     homepage = "https://github.com/tpaviot/pythonocc-core";
-    changelog = "https://github.com/tpaviot/pythonocc-core/releases/tag/${version}";
+    changelog = "https://github.com/tpaviot/pythonocc-core/releases/tag/${finalAttrs.version}";
     license = lib.licenses.lgpl3;
     platforms = lib.platforms.unix;
     maintainers = [ ];
   };
-}
+})
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 5abbf6f9f11e4..35de7d236e13e 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -7309,13 +7309,6 @@ with pkgs;
       url = "https://git.dev.opencascade.org/gitweb/?p=occt.git;a=snapshot;h=${commit};sf=tgz";
       hash = "sha256-n3KFrN/mN1SVXfuhEUAQ1fJzrCvhiclxfEIouyj9Z18=";
     };
-    patches = [
-      # Backport GCC 14 build fix
-      (fetchpatch {
-        url = "https://github.com/Open-Cascade-SAS/OCCT/commit/7236e83dcc1e7284e66dc61e612154617ef715d6.patch";
-        hash = "sha256-NoC2mE3DG78Y0c9UWonx1vmXoU4g5XxFUT3eVXqLU60=";
-      })
-    ];
   };
 
   opencascade-occt_7_6_1 = opencascade-occt.overrideAttrs {