diff --git a/spack-environment/packages.yaml b/spack-environment/packages.yaml
index bf3e201884d5dfedd7ff2fe1788e17e5170f67aa..1a874a22e9ade13319b196775a10f7dbbbaf8007 100644
--- a/spack-environment/packages.yaml
+++ b/spack-environment/packages.yaml
@@ -292,7 +292,7 @@ packages:
     - +opengl
   root:
     require:
-    - '@6.28.04'
+    - '@6.28.06'
     - cxxstd=17 +fftw +fortran +gdml +http -ipo +mlp +pythia8 +root7 +tmva +vc +xrootd +ssl
     - any_of: [+opengl +webgui +x, -opengl -webgui -x]
   snakemake:
diff --git a/spack.sh b/spack.sh
index 40352c08f50596f58ad334261819eb0408352669..e089a7722db7f848ca7c71bd2ec2fd30a7311f24 100644
--- a/spack.sh
+++ b/spack.sh
@@ -56,6 +56,7 @@ f709518916ffe11588cffa3a5821c1e49e94b8d2
 73ad3f729e8a5206d717d9d66468a19bb11d2940
 bd58801415dc0acebfd7368f66c43e50563a9891
 e1373d5408170047626583916db02911585c133a
+a65f13f79f617b6aa0b235aa5db612473b6d8c0e
 ---
 ## Ref: https://github.com/spack/spack/commit/[hash]
 ## [hash]: [description]
@@ -111,3 +112,5 @@ e1373d5408170047626583916db02911585c133a
 ## // c7cca3aa8d11789eaee9bfc80b8417ffea511532: dd4hep: new version 1.26
 ## e1373d5408170047626583916db02911585c133a: dd4hep: make sure to find libraries correctly
 ## // a095c8113d5065bcb3d529269bc1de268df6791f: dd4hep: Add tag for version 1.27
+## a65f13f79f617b6aa0b235aa5db612473b6d8c0e: root: add latest available tag
+