diff --git a/containers/builder/spack.yaml b/containers/builder/spack.yaml
index 50dd5e81d8d6be43ca101bebf13539a0c7c8f6d4..793737491c1d7d5aebc227f4dc9cb563868fdd11 100644
--- a/containers/builder/spack.yaml
+++ b/containers/builder/spack.yaml
@@ -6,7 +6,7 @@ spack:
     - nlohmann-json@3.9.1
     - heppdt@3.04.01
     - clhep@2.4.1.3 cxxstd=17
-    - eigen@3.3.8
+    - eigen@3.3.7
     - python@3.7.8
     - py-pip
     - py-numpy