diff --git a/prusa-slicer-openexr3.patch b/prusa-slicer-openexr3.patch
index 772c77b..9caf47f 100644
--- a/prusa-slicer-openexr3.patch
+++ b/prusa-slicer-openexr3.patch
@@ -1,12 +1,11 @@
-diff --git a/cmake/modules/FindOpenVDB.cmake b/cmake/modules/FindOpenVDB.cmake
-index 02420fed8..4b93111ab 100644
---- a/cmake/modules/FindOpenVDB.cmake
-+++ b/cmake/modules/FindOpenVDB.cmake
-@@ -326,28 +326,10 @@ macro(just_fail msg)
+diff -up PrusaSlicer-version_2.4.0/cmake/modules/FindOpenVDB.cmake.openexr3 PrusaSlicer-version_2.4.0/cmake/modules/FindOpenVDB.cmake
+--- PrusaSlicer-version_2.4.0/cmake/modules/FindOpenVDB.cmake.openexr3	2021-12-21 15:57:35.000000000 +0000
++++ PrusaSlicer-version_2.4.0/cmake/modules/FindOpenVDB.cmake	2022-02-11 19:27:12.105404186 +0000
+@@ -347,28 +347,10 @@ macro(just_fail msg)
    return()
  endmacro()
  
--find_package(IlmBase QUIET COMPONENTS Half)
+-find_package(IlmBase QUIET)
 -if(NOT IlmBase_FOUND)
 -  pkg_check_modules(IlmBase QUIET IlmBase)
 -endif()
@@ -32,7 +31,7 @@ index 02420fed8..4b93111ab 100644
  
  # Use GetPrerequisites to see which libraries this OpenVDB lib has linked to
  # which we can query for optional deps. This basically runs ldd/otoll/objdump
-@@ -398,7 +380,7 @@ foreach(PREREQUISITE ${_OPENVDB_PREREQUISITE_LIST})
+@@ -419,7 +401,7 @@ foreach(PREREQUISITE ${_OPENVDB_PREREQUI
      set(OpenVDB_USES_LOG4CPLUS ON)
    endif()
  
@@ -41,7 +40,7 @@ index 02420fed8..4b93111ab 100644
    if(NOT ${_HAS_DEP} EQUAL -1)
      set(OpenVDB_USES_ILM ON)
    endif()
-@@ -429,11 +411,7 @@ if(OpenVDB_USES_LOG4CPLUS)
+@@ -450,11 +432,7 @@ if(OpenVDB_USES_LOG4CPLUS)
    find_package(Log4cplus ${_quiet} ${_required})
  endif()
  
@@ -54,7 +53,7 @@ index 02420fed8..4b93111ab 100644
    find_package(OpenEXR ${_quiet} ${_required})
  endif()
  
-@@ -450,7 +428,7 @@ endif()
+@@ -471,7 +449,7 @@ endif()
  set(_OPENVDB_VISIBLE_DEPENDENCIES
    Boost::iostreams
    Boost::system
@@ -63,7 +62,7 @@ index 02420fed8..4b93111ab 100644
  )
  
  set(_OPENVDB_DEFINITIONS)
-@@ -460,10 +438,7 @@ endif()
+@@ -481,10 +459,7 @@ endif()
  
  if(OpenVDB_USES_EXR)
    list(APPEND _OPENVDB_VISIBLE_DEPENDENCIES
diff --git a/prusa-slicer.spec b/prusa-slicer.spec
index ab19cb5..64820cf 100644
--- a/prusa-slicer.spec
+++ b/prusa-slicer.spec
@@ -7,8 +7,8 @@
 %endif
 
 Name:           prusa-slicer
-Version:        2.3.3
-Release:        5%{?dist}
+Version:        2.4.0
+Release:        1%{?dist}
 Summary:        3D printing slicer optimized for Prusa printers
 
 # The main PrusaSlicer code and resources are AGPLv3, with small parts as
@@ -25,10 +25,7 @@ Source0:        https://github.com/prusa3d/PrusaSlicer/archive/version_%version.
 Source1:        %name.desktop
 Source2:        %name.appdata.xml
 
-# Fix build error with non-const MINSIGSTKSZ
-# https://github.com/prusa3d/PrusaSlicer/pull/6518
-Patch1:         0001-Fix-build-error-with-non-const-MINSIGSTKSZ.patch
-
+Patch1:		prusa-slicer-no-cereal-lib.patch
 
 # Beware!
 # Patches >= 340 are only applied on Fedora 34+
@@ -63,7 +60,8 @@ BuildRequires:  gtest-devel
 BuildRequires:  ilmbase-devel
 BuildRequires:  ImageMagick
 BuildRequires:  libgudev
-BuildRequires:  miniz-devel
+# Upstream miniz is no longer compatible, gotta use the fork.
+# BuildRequires:  miniz-devel
 BuildRequires:  NLopt-devel
 BuildRequires:  openvdb
 BuildRequires:  openvdb-devel
@@ -72,9 +70,6 @@ BuildRequires:  tbb-devel
 BuildRequires:  wxBase3-devel
 BuildRequires:  wxGTK3-devel
 
-# Upstream says this is obsolete, but still needed to compile
-BuildRequires:  poly2tri-devel
-
 # Things we wish we could unbundle
 #BuildRequires:  admesh-devel >= 0.98.1
 #BuildRequires:  polyclipping-devel >= 6.2.0
@@ -157,6 +152,10 @@ Provides: bundled(imgui) = 1.66
 # License: MIT
 Provides: bundled(mesa-libGLU)
 
+# PrusaResearch added functions to the upstream miniz. Yay.
+# License: MIT
+Provides: bundled(miniz) = 2.1.0prusa
+
 # A header-only library, developed by one of the authors of PrusaSlicer.  Not
 # packaged in Fedora, but could be (for little benefit).
 # None of the source files carry licensing information, but a file LICENSE.txt
@@ -264,11 +263,6 @@ unbundle () {
 unbundle eigen
 unbundle expat
 unbundle glew
-unbundle miniz
-
-# Upstream says this is obsolete, but it's still needed for compilation.
-# The Fedora version appears to work fine for that purpose so we'll use it.
-unbundle poly2tri
 
 # These tests were fixed but the fixes were undone upsteam with commit ac6969c
 # https://github.com/prusa3d/PrusaSlicer/issues/2288
@@ -395,6 +389,9 @@ rm -rf %buildroot%_datadir/PrusaSlicer/data/
 %endif
 
 %changelog
+* Mon Feb 14 2022 Tom Callaway <spot@fedoraproject.org> - 2.4.0-1
+- update to 2.4.0
+
 * Thu Feb 10 2022 Orion Poplawski <orion@nwra.com> - 2.3.3-5
 - Rebuild for glew 2.2
 
diff --git a/sources b/sources
index 3ea83e0..5b8c1be 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (version_2.3.3.tar.gz) = 1f6b97e135202ad9de8f0bb212239ce2497de4205ea32f860b483473fb1f1783451d539a67cd97ef31f512a797b29c1067a1eff4134ea4a29b6218e5757657e2
+SHA512 (version_2.4.0.tar.gz) = e923e4e6273dbcfc3e2bc0e28f9eb8cda8530747c0a834f48aea715d75ba1d02be9cfee043689efccdaee40de00114f7964e43accad245b9acd801b997868e3c