diff --git a/config/versions.json b/config/versions.json
index 50446e6..44dedb0 100644
--- a/config/versions.json
+++ b/config/versions.json
@@ -1,7 +1,7 @@
 {
   "$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": "2026.03.005",
+  "access-spack-packages": "0e38431c4c04a65affc68dbe835b0ed811d20489",
   "custom-scopes": [
     "ukmo-restricted-scope"
   ]
diff --git a/spack.yaml b/spack.yaml
index f924f62..2c53908 100644
--- a/spack.yaml
+++ b/spack.yaml
@@ -6,7 +6,7 @@ spack:
   definitions:
   # _name and _version are reserved definitions that inform build-cd deployments, and have no effect otherwise
   - _name: [access-am3]
-  - _version: [2026.05.000]
+  - _version: [2026.05.001]
   specs:
   - access-am3
   packages:
@@ -15,7 +15,7 @@ spack:
       require:
       - '@13.1'
       - model="vn13p1-am"
-      - jules_ref="2026.05.0"
+      - jules_ref="0734d12dc621f9095050ec2597c93b61ab4fc36d"
       - um_ref="2026.05.0"
       - ukca_ref="AM3-2026.03.0"