diff --git a/spack.yaml b/spack.yaml
index c2fbd3c08f1dc07a674385037ea4ad7f760230e2..e2d9411e59ca628ed0cc2f89c31a15da86cba88f 100644
--- a/spack.yaml
+++ b/spack.yaml
@@ -7,7 +7,7 @@ spack:
     - dawn@3_91a
     - dawncut@1_54a
     - dd4hep@1.18 +geant4 +assimp +hepmc3 +ipo +lcio
-    - eigen@3.3.9
+    - eigen@3.4.0
     - emacs@27.0:27.99 toolkit=athena
     - fastjet@3.3.3
     - fmt@7.1.2 +shared cxxstd=17