diff --git a/env/sles15/aarch64/sysconfigs/packages.yaml b/env/sles15/aarch64/sysconfigs/packages.yaml
index 41d5b9f..63d1550 100644
--- a/env/sles15/aarch64/sysconfigs/packages.yaml
+++ b/env/sles15/aarch64/sysconfigs/packages.yaml
@@ -70,17 +70,8 @@ packages:
         spec: cray-pmi@6.1.13%gcc
   cuda:
     prefer:
-    - spec: '@12.8.0'
+    - spec: '@12.6.0'
     require: '@12.2.0:'
-    externals:
-      - modules:
-        - nvhpc-nompi/24.3
-        prefix: /opt/nvidia/hpc_sdk/Linux_aarch64/24.3/cuda
-        spec: cuda@12.2.0%nvhpc@24.3
-        extra_attributes:
-          environment:
-            prepend_path:
-              LD_LIBRARY_PATH: /opt/nvidia/hpc_sdk/Linux_aarch64/24.3/math_libs/lib64/stubs
   curl:
     require: '%gcc@7.5.0'
   cxi-driver:
diff --git a/env/sles15/x86_64/sysconfigs/packages.yaml b/env/sles15/x86_64/sysconfigs/packages.yaml
index cd765e3..a1bc64e 100644
--- a/env/sles15/x86_64/sysconfigs/packages.yaml
+++ b/env/sles15/x86_64/sysconfigs/packages.yaml
@@ -69,13 +69,8 @@ packages:
         spec: cray-pmi@6.1.13^gcc
   cuda:
     prefer:
-    - spec: '@12.8.0'
+    - spec: '@12.6.0'
     require: '@12.2.0:'
-    externals:
-      - modules:
-          - nvhpc-nompi/23.9
-        prefix: /opt/nvidia/hpc_sdk/Linux_x86_64/23.9/cuda
-        spec: cuda@12.2.0%nvhpc@23.9
   curl:
     require: '%gcc@7.5.0'
   cxi-driver: