diff --git a/flake.lock b/flake.lock
index c9e8792..f78bd04 100644
--- a/flake.lock
+++ b/flake.lock
@@ -37,16 +37,16 @@
     "dd4hep-src": {
       "flake": false,
       "locked": {
-        "lastModified": 1698160069,
-        "narHash": "sha256-vROAG965klhuqQOipddVxRwSVdMI9c7a0zmEKPsNmQs=",
+        "lastModified": 1700579447,
+        "narHash": "sha256-GUt5Cdm/Bl74mNJxVdfhgO+jFDWcycfqxPEmfWtl9PE=",
         "owner": "AIDASoft",
         "repo": "DD4hep",
-        "rev": "ff4c726c90084b378cd9dc413ae2114e829002a7",
+        "rev": "04bb629ddab5344c8df69070c35573f2f8095c69",
         "type": "github"
       },
       "original": {
         "owner": "AIDASoft",
-        "ref": "v01-27",
+        "ref": "v01-27-01",
         "repo": "DD4hep",
         "type": "github"
       }
diff --git a/flake.nix b/flake.nix
index 7d73cb5..fa8c20a 100644
--- a/flake.nix
+++ b/flake.nix
@@ -18,7 +18,7 @@
     flake = false;
   };
   inputs.dd4hep-src = {
-    url = "github:AIDASoft/DD4hep/v01-27";
+    url = "github:AIDASoft/DD4hep/v01-27-01";
     flake = false;
   };
   inputs.edm4eic-src = {
diff --git a/pkgs/dd4hep/default.nix b/pkgs/dd4hep/default.nix
index e7ed91c..aa91a59 100644
--- a/pkgs/dd4hep/default.nix
+++ b/pkgs/dd4hep/default.nix
@@ -19,14 +19,10 @@
 
 stdenv.mkDerivation rec {
   pname = "DD4hep";
-  version = "01-27.${dd4hep-src.shortRev or "dirty"}";
+  version = "01-27-01.${dd4hep-src.shortRev or "dirty"}";
 
   src = dd4hep-src;
 
-  patches = [
-    ./hexgrid_fix.patch
-  ];
-
   postPatch = ''
     patchShebangs --host .
 
@@ -35,19 +31,11 @@ stdenv.mkDerivation rec {
 
     substituteInPlace DDCore/CMakeLists.txt \
       --replace "ROOT::ROOTHistDraw" ""
-
-    substituteInPlace DDG4/edm4hep/Geant4Output2EDM4hep.cpp \
-      --replace "setValues" "setValue" \
-      --replace "hits = m_calorimeterHits[colName] = edm4hep::SimTrackerHitCollection()" "hits = m_calorimeterHits[colName]"
   '' + lib.optionalString stdenv.isDarwin ''
     substituteInPlace cmake/DD4hepBuild.cmake \
       --replace 'set(CMAKE_INSTALL_NAME_DIR "@rpath")' "" \
       --replace 'set(CMAKE_INSTALL_RPATH "@loader_path/../lib")' "" \
       --replace 'SET(Python_FIND_FRAMEWORK LAST)' 'set(Python_FIND_FRAMEWORK NEVER)'
-    substituteInPlace cmake/DD4hep.cmake \
-      --replace \
-      'set(''${ENV_VAR}_VALUE $<TARGET_FILE_DIR:''${library}>:$<TARGET_FILE_DIR:DD4hep::DD4hepGaudiPluginMgr>)' \
-      'set(''${ENV_VAR}_VALUE $<TARGET_FILE_DIR:''${library}>:$<TARGET_FILE_DIR:DD4hep::DD4hepGaudiPluginMgr>:''$ENV{''${ENV_VAR}})'
   '';
 
   nativeBuildInputs = [
diff --git a/pkgs/dd4hep/hexgrid_fix.patch b/pkgs/dd4hep/hexgrid_fix.patch
deleted file mode 100644
index fd41b88..0000000
--- a/pkgs/dd4hep/hexgrid_fix.patch
+++ /dev/null
@@ -1,43 +0,0 @@
-diff --git a/DDCore/src/plugins/ReadoutSegmentations.cpp b/DDCore/src/plugins/ReadoutSegmentations.cpp
-index 7462e7d9..578c3bfb 100644
---- a/DDCore/src/plugins/ReadoutSegmentations.cpp
-+++ b/DDCore/src/plugins/ReadoutSegmentations.cpp
-@@ -40,6 +40,9 @@ DECLARE_SEGMENTATION(CartesianGridYZ,create_segmentation<dd4hep::DDSegmentation:
- #include "DDSegmentation/CartesianGridXYZ.h"
- DECLARE_SEGMENTATION(CartesianGridXYZ,create_segmentation<dd4hep::DDSegmentation::CartesianGridXYZ>)
- 
-+#include "DDSegmentation/CartesianGridXYStaggered.h"
-+DECLARE_SEGMENTATION(CartesianGridXYStaggered,dd4hep::create_segmentation<dd4hep::DDSegmentation::CartesianGridXYStaggered>)
-+
- #include "DDSegmentation/CartesianStripX.h"
- DECLARE_SEGMENTATION(CartesianStripX,create_segmentation<dd4hep::DDSegmentation::CartesianStripX>)
- 
-@@ -75,3 +78,6 @@ DECLARE_SEGMENTATION(ProjectiveCylinder,create_segmentation<dd4hep::DDSegmentati
- 
- #include "DDSegmentation/MultiSegmentation.h"
- DECLARE_SEGMENTATION(MultiSegmentation,create_segmentation<dd4hep::DDSegmentation::MultiSegmentation>)
-+
-+#include "DDSegmentation/HexGrid.h"
-+DECLARE_SEGMENTATION(HexGrid,create_segmentation<dd4hep::DDSegmentation::HexGrid>)
-diff --git a/DDCore/src/segmentations/CartesianGridXYStaggered.cpp b/DDCore/src/segmentations/CartesianGridXYStaggered.cpp
-index 871958ff..69cf7723 100644
---- a/DDCore/src/segmentations/CartesianGridXYStaggered.cpp
-+++ b/DDCore/src/segmentations/CartesianGridXYStaggered.cpp
-@@ -96,7 +96,3 @@ std::vector<double> CartesianGridXYStaggered::cellDimensions(const CellID& cellI
- 
- } /* namespace DDSegmentation */
- } /* namespace dd4hep */
--
--// This is done DDCore/src/plugins/ReadoutSegmentations.cpp so the plugin is not part of libDDCore
--// needs also #include "DD4hep/Factories.h"
--// DECLARE_SEGMENTATION(CartesianGridXYStaggered,dd4hep::create_segmentation<dd4hep::DDSegmentation::CartesianGridXYStaggered>)
-diff --git a/DDCore/src/segmentations/HexGrid.cpp b/DDCore/src/segmentations/HexGrid.cpp
-index f051a8f6..0e9224e5 100644
---- a/DDCore/src/segmentations/HexGrid.cpp
-+++ b/DDCore/src/segmentations/HexGrid.cpp
-@@ -145,5 +145,3 @@ namespace dd4hep {
- 
-   } /* namespace DDSegmentation */
- } /* namespace dd4hep */
--
--DECLARE_SEGMENTATION(HexGrid, create_segmentation<dd4hep::DDSegmentation::HexGrid>)