diff --git a/eic-spack.sh b/eic-spack.sh
index 64c9acd5..2fd7466a 100644
--- a/eic-spack.sh
+++ b/eic-spack.sh
@@ -5,4 +5,4 @@ EICSPACK_ORGREPO="eic/eic-spack"
 
 ## EIC spack commit hash or github version, e.g. v0.19.7
 ## note: nightly builds could use a branch e.g. releases/v0.19
-EICSPACK_VERSION="a9277ebffb02eba2e1ddcf867a81f2323c323dac"
+EICSPACK_VERSION="ec7e55c3776da9923b7c68a4ddb9a2dfff5aaf18"
diff --git a/spack-environment/packages.yaml b/spack-environment/packages.yaml
index aaa92bf5..dd6ba2ed 100644
--- a/spack-environment/packages.yaml
+++ b/spack-environment/packages.yaml
@@ -126,7 +126,7 @@ packages:
   dd4hep:
     require:
     - '@1.36'
-    - +ddg4 +ddcad +edm4hep +hepmc3 +xercesc
+    - +ddg4 +ddcad +edm4hep +g4hepem +hepmc3 +xercesc
     - any_of: [+ddeve +utilityapps, -ddeve -utilityapps] # FIXME ^root +x +opengl when +utilityapps
   doxygen:
     require: