diff --git a/pkgs/applications/misc/prusa-slicer/default.nix b/pkgs/applications/misc/prusa-slicer/default.nix
index 2ac668050318..6c2d0c2c168f 100644
--- a/pkgs/applications/misc/prusa-slicer/default.nix
+++ b/pkgs/applications/misc/prusa-slicer/default.nix
@@ -25,7 +25,7 @@
 , mpfr
 , nanosvg
 , nlopt
-, opencascade-occt_7_6
+, opencascade-occt_7_6_1
 , openvdb
 , pcre
 , qhull
@@ -40,15 +40,6 @@
 , wxGTK-override ? null
 }:
 let
-  opencascade-occt = opencascade-occt_7_6.overrideAttrs (old: {
-    version = "7.6.1";
-    src = fetchFromGitHub {
-      owner = "Open-Cascade-SAS";
-      repo = "OCCT";
-      rev = "V7_6_1";
-      sha256 = "sha256-C02P3D363UwF0NM6R4D4c6yE5ZZxCcu5CpUaoTOxh7E=";
-    };
-  });
   wxGTK-prusa = wxGTK32.overrideAttrs (old: rec {
     pname = "wxwidgets-prusa3d-patched";
     version = "3.2.0";
@@ -127,7 +118,7 @@ stdenv.mkDerivation (finalAttrs: {
     mpfr
     nanosvg-fltk
     nlopt
-    opencascade-occt
+    opencascade-occt_7_6_1
     openvdb_tbb_2021_8
     pcre
     qhull