diff --git a/ansible/group_vars/nimbus.prater.yml b/ansible/group_vars/nimbus.prater.yml
index 1f8b90f..deab26c 100644
--- a/ansible/group_vars/nimbus.prater.yml
+++ b/ansible/group_vars/nimbus.prater.yml
@@ -1,7 +1,11 @@
 ---
 beacon_node_network: 'prater'
 # TODO This is to avoid too long service names.
-beacon_node_repo_branch: '{{ (node.branch == "libp2p") | ternary("nim-libp2p-auto-bump-unstable", node.branch) }}'
+beacon_node_repo_branch: >-
+  {{ node.branch_override is defined | ternary(
+       node.branch_override,
+       ((node.branch == "libp2p") | ternary("nim-libp2p-auto-bump-unstable", node.branch))
+     ) }}
 # TODO Drop this once all nodes have an number.
 service_number: '{{ node.get("num", False) | ternary(("-%02d"|format(node.get("num", 0))), "") }}'
 beacon_node_service_name: 'beacon-node-{{ beacon_node_network }}-{{ node.branch }}{{ service_number }}'
@@ -68,32 +72,32 @@ nodes_layout:
 
   'metal-03.he-eu-hel1.nimbus.prater':
     - { branch: 'stable',                                     build_freq: '*-*-* 11:00:00' }
-    - { branch: 'unstable',                                   build_freq: '*-*-* 13:00:00' }
     - { branch: 'testing',                                    build_freq: '*-*-* 15:00:00' }
+    - { branch: 'unstable',                                   build_freq: '*-*-* 13:00:00' }
     - { branch: 'libp2p',                                     build_freq: '*-*-* 17:00:00' }
 
   'metal-04.he-eu-hel1.nimbus.prater':
     - { branch: 'stable',                                     build_freq: '*-*-* 11:00:00' }
-    - { branch: 'unstable',                                   build_freq: '*-*-* 13:00:00' }
     - { branch: 'testing',                                    build_freq: '*-*-* 15:00:00' }
+    - { branch: 'unstable',                                   build_freq: '*-*-* 13:00:00' }
     - { branch: 'libp2p',                                     build_freq: '*-*-* 17:00:00' }
 
   'metal-05.he-eu-hel1.nimbus.prater':
     - { branch: 'stable',                                     build_freq: '*-*-* 11:00:00' }
-    - { branch: 'unstable',                                   build_freq: '*-*-* 13:00:00' }
     - { branch: 'testing',                                    build_freq: '*-*-* 15:00:00' }
+    - { branch: 'unstable',                                   build_freq: '*-*-* 13:00:00' }
     - { branch: 'libp2p',                                     build_freq: '*-*-* 17:00:00' }
 
   'metal-06.he-eu-hel1.nimbus.prater':
     - { branch: 'stable',                                     build_freq: '*-*-* 11:00:00' }
+    - { branch: 'testing',                                    build_freq: '*-*-* 15:00:00', branch_override: 'nim-1.6' }
     - { branch: 'unstable',                                   build_freq: '*-*-* 13:00:00' }
-    - { branch: 'testing',                                    build_freq: '*-*-* 15:00:00' }
     - { branch: 'libp2p',                                     build_freq: '*-*-* 17:00:00' }
 
   'metal-07.he-eu-hel1.nimbus.prater':
     - { branch: 'stable',                                     build_freq: '*-*-* 11:00:00' }
+    - { branch: 'testing',                                    build_freq: '*-*-* 15:00:00', branch_override: 'nim-1.6' }
     - { branch: 'unstable',                                   build_freq: '*-*-* 13:00:00' }
-    - { branch: 'testing',                                    build_freq: '*-*-* 15:00:00' }
     - { branch: 'libp2p',                                     build_freq: '*-*-* 17:00:00' }
 
   'windows-01.gc-us-central1-a.nimbus.prater':
diff --git a/ansible/requirements.yml b/ansible/requirements.yml
index df76520..1de8b6c 100644
--- a/ansible/requirements.yml
+++ b/ansible/requirements.yml
@@ -46,7 +46,7 @@
 
 - name: infra-role-beacon-node-linux
   src: git@github.com:status-im/infra-role-beacon-node-linux.git
-  version: 5f50a97c07493d65a254b85c90f55dedff1728b7
+  version: 871b4d5c20597b7c16c6c952699390d8469ea51c
   scm: git
 
 - name: infra-role-beacon-node-windows