diff --git a/spack-environment/packages.yaml b/spack-environment/packages.yaml
index 441c49a45b9f0d5f441e10c0e939d20ce9965c62..5cd62a81139968afe1b8ee8be2d3c528c21d9012 100644
--- a/spack-environment/packages.yaml
+++ b/spack-environment/packages.yaml
@@ -299,7 +299,7 @@ packages:
     - +opengl
   root:
     require:
-    - '@6.28.10'
+    - '@6.28.06'
     - cxxstd=20 +fftw +fortran +gdml +http -ipo +mlp +root7 +tmva +vc +xrootd +ssl
     - any_of: [+opengl +webgui +x, -opengl -webgui -x]
   snakemake: