diff --git a/spack-environment/packages.yaml b/spack-environment/packages.yaml
index 71972caf923ba41226dc7efc7671535e81517ee2..311565d45a970e67a3aaa2eabcd5a3c3f49f4d55 100644
--- a/spack-environment/packages.yaml
+++ b/spack-environment/packages.yaml
@@ -278,7 +278,7 @@ packages:
     - '@2.3.4'
   py-hist:
     require:
-    - '@2.7.3'
+    - '@2.6.1'
   py-histoprint:
     require:
     - '@2.4.0'