diff --git a/spack-environment/packages.yaml b/spack-environment/packages.yaml
index f0a4ef5105d53ea4837b494b6db1659ec84ad44a..0e3e895f18d44de61163a1f24a962ef9e489a23c 100644
--- a/spack-environment/packages.yaml
+++ b/spack-environment/packages.yaml
@@ -19,8 +19,8 @@ packages:
   acts:
     require:
     - '%clang'
-    - '@34.1.0'
-    - cxxstd=20 +dd4hep +edm4hep +examples +fatras +geant4 +identification +json +onnx +podio +python +tgeo
+    - '@35.2.0'
+    - cxxstd=20 +dd4hep +edm4hep +examples +fatras +geant4 +json +onnx +podio +python +tgeo
   actsvg:
     require:
     - '@0.4.26'
diff --git a/spack.sh b/spack.sh
index 26765a621abf59a5d3addcf5a7911e67e6024e4b..850cfa9fa0ce4d91621c7380b65a0734890cd854 100644
--- a/spack.sh
+++ b/spack.sh
@@ -15,6 +15,7 @@ c50ac5ac25619bdf0b3e75884a893a73e5713e05
 69b17ea6024b1f9ef39681f1aba3a499e54f58eb
 6a217dc5d327de87441ebec89c43818bf8fe2746
 00f179ee6da8252dff882c2d2249240f2d43805a
+94cf51875f0e29b79c2a1bd69e0fcddac3eec0c8
 ---
 ## Optional hash table with comma-separated file list
 read -r -d '' SPACK_CHERRYPICKS_FILES <<- \
@@ -29,3 +30,4 @@ read -r -d '' SPACK_CHERRYPICKS_FILES <<- \
 ## 69b17ea6024b1f9ef39681f1aba3a499e54f58eb: py-paramiko: add v3.3.2, v3.4.1, v3.5.0
 ## 6a217dc5d327de87441ebec89c43818bf8fe2746: gsoap: depends_on autoconf etc type build
 ## 00f179ee6da8252dff882c2d2249240f2d43805a: root: add v6.32.08
+## 94cf51875f0e29b79c2a1bd69e0fcddac3eec0c8: acts: don't use system dfelibs for 35.1:36.0