diff --git a/config/versions.json b/config/versions.json
index 2e0bd08..0bdac96 100644
--- a/config/versions.json
+++ b/config/versions.json
@@ -1,5 +1,5 @@
 {
     "$schema": "https://raw.githubusercontent.com/ACCESS-NRI/schema/main/au.org.access-nri/model/deployment/config/versions/3-0-0.json",
     "spack": "0.22",
-    "spack-packages": "2025.04.001"
+    "spack-packages": "9ff20ba9201f0552c7f50b2db1e2f9458da3e004"
 }
diff --git a/spack.yaml b/spack.yaml
index 3075665..87ff2ad 100644
--- a/spack.yaml
+++ b/spack.yaml
@@ -4,8 +4,9 @@ spack:
   packages:
     issm:
       require:
-        - '@git.2025.04.11'
+        - '@git.7f75a90562fae6834a33bdc6276eaa5dc2cbcf66'
         - +wrappers
+        - +py-tools
     # Mark Python 3.9.2 as external so Spack reuses the system module
     python:
       externals: