diff --git a/spack-environment/packages.yaml b/spack-environment/packages.yaml
index 311565d45a970e67a3aaa2eabcd5a3c3f49f4d55..af8607e536196a9b54e2c2fe3046fca08c8bba2e 100644
--- a/spack-environment/packages.yaml
+++ b/spack-environment/packages.yaml
@@ -275,7 +275,7 @@ packages:
     - '@git.c388cecce90d06f2db75e45bb0427816db04c836'
   py-hepunits:
     require:
-    - '@2.3.4'
+    - '@2.3.2'
   py-hist:
     require:
     - '@2.6.1'