diff --git a/config/versions.json b/config/versions.json
index 0ac7ad9..70d17da 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/4-0-0.json",
   "spack": "1.1",
-  "access-spack-packages": "2026.03.001"
+  "access-spack-packages": "justinh2002/new_ad_flavour"
 }
diff --git a/spack.yaml b/spack.yaml
index b41e54b..bdd8edd 100644
--- a/spack.yaml
+++ b/spack.yaml
@@ -1,7 +1,7 @@
 spack:
   definitions:
   - _name: [access-issm]
-  - _version: [2025.11.0]
+  - _version: [2026.04.0]
   specs:
   - access-issm
   packages:
@@ -10,7 +10,7 @@ spack:
       - '@git.2025.11.24'
       - +wrappers
       - +py-tools
-      - ~ad
+      - +ad
 
     python:
       require: