diff --git a/etc/kayobe/environments/ci-aio/stackhpc-ci.yml b/etc/kayobe/environments/ci-aio/stackhpc-ci.yml
index b43133780..f95f7ecb9 100644
--- a/etc/kayobe/environments/ci-aio/stackhpc-ci.yml
+++ b/etc/kayobe/environments/ci-aio/stackhpc-ci.yml
@@ -24,6 +24,8 @@ stackhpc_repo_mirror_password: !vault |
 # Build against released Pulp repository versions.
 stackhpc_repo_grafana_version: "{{ stackhpc_pulp_repo_grafana_version }}"
 stackhpc_repo_rhel9_rabbitmq_erlang_version: "{{ stackhpc_pulp_repo_multiarch_rhel9_rabbitmq_erlang_version }}"
+stackhpc_repo_rhel9_rabbitmq_erlang_26_version: "{{ stackhpc_pulp_repo_multiarch_rhel9_rabbitmq_erlang_26_version }}"
+stackhpc_repo_rhel9_rabbitmq_erlang_27_version: "{{ stackhpc_pulp_repo_multiarch_rhel9_rabbitmq_erlang_27_version }}"
 stackhpc_repo_rhel9_rabbitmq_server_version: "{{ stackhpc_pulp_repo_rhel9_rabbitmq_server_version }}"
 stackhpc_repo_ubuntu_jammy_version: "{{ stackhpc_pulp_repo_ubuntu_jammy_version }}"
 stackhpc_repo_ubuntu_jammy_security_version: "{{ stackhpc_pulp_repo_ubuntu_jammy_security_version }}"
diff --git a/etc/kayobe/environments/ci-builder/stackhpc-ci.yml b/etc/kayobe/environments/ci-builder/stackhpc-ci.yml
index 15e794dae..f936d2898 100644
--- a/etc/kayobe/environments/ci-builder/stackhpc-ci.yml
+++ b/etc/kayobe/environments/ci-builder/stackhpc-ci.yml
@@ -50,6 +50,8 @@ stackhpc_repo_mirror_password: !vault |
 # Build against released Pulp repository versions.
 stackhpc_repo_grafana_version: "{{ stackhpc_pulp_repo_grafana_version }}"
 stackhpc_repo_rhel9_rabbitmq_erlang_version: "{{ stackhpc_pulp_repo_multiarch_rhel9_rabbitmq_erlang_version }}"
+stackhpc_repo_rhel9_rabbitmq_erlang_26_version: "{{ stackhpc_pulp_repo_multiarch_rhel9_rabbitmq_erlang_26_version }}"
+stackhpc_repo_rhel9_rabbitmq_erlang_27_version: "{{ stackhpc_pulp_repo_multiarch_rhel9_rabbitmq_erlang_27_version }}"
 stackhpc_repo_rhel9_rabbitmq_server_version: "{{ stackhpc_pulp_repo_rhel9_rabbitmq_server_version }}"
 stackhpc_repo_ubuntu_jammy_version: "{{ stackhpc_pulp_repo_ubuntu_jammy_version }}"
 stackhpc_repo_ubuntu_jammy_security_version: "{{ stackhpc_pulp_repo_ubuntu_jammy_security_version }}"
diff --git a/etc/kayobe/environments/ci-multinode/stackhpc-ci.yml b/etc/kayobe/environments/ci-multinode/stackhpc-ci.yml
index 05c21b4cd..40a863f85 100644
--- a/etc/kayobe/environments/ci-multinode/stackhpc-ci.yml
+++ b/etc/kayobe/environments/ci-multinode/stackhpc-ci.yml
@@ -24,6 +24,8 @@ stackhpc_repo_mirror_password: !vault |
 # Build and deploy released Pulp repository versions.
 stackhpc_repo_grafana_version: "{{ stackhpc_pulp_repo_grafana_version }}"
 stackhpc_repo_rhel9_rabbitmq_erlang_version: "{{ stackhpc_pulp_repo_multiarch_rhel9_rabbitmq_erlang_version }}"
+stackhpc_repo_rhel9_rabbitmq_erlang_26_version: "{{ stackhpc_pulp_repo_multiarch_rhel9_rabbitmq_erlang_26_version }}"
+stackhpc_repo_rhel9_rabbitmq_erlang_27_version: "{{ stackhpc_pulp_repo_multiarch_rhel9_rabbitmq_erlang_27_version }}"
 stackhpc_repo_rhel9_rabbitmq_server_version: "{{ stackhpc_pulp_repo_rhel9_rabbitmq_server_version }}"
 stackhpc_repo_ubuntu_jammy_version: "{{ stackhpc_pulp_repo_ubuntu_jammy_version }}"
 stackhpc_repo_ubuntu_jammy_security_version: "{{ stackhpc_pulp_repo_ubuntu_jammy_security_version }}"
diff --git a/etc/kayobe/kolla-image-tags.yml b/etc/kayobe/kolla-image-tags.yml
index d145c068e..49c063f9f 100644
--- a/etc/kayobe/kolla-image-tags.yml
+++ b/etc/kayobe/kolla-image-tags.yml
@@ -54,6 +54,7 @@ kolla_image_tags:
     ubuntu-jammy: 2024.1-ubuntu-jammy-20250627T102805
     ubuntu-noble: 2024.1-ubuntu-noble-20250627T102805
   kolla_toolbox:
+    rocky-9: 2024.1-rocky-9-20250908T155427
     ubuntu-jammy: 2024.1-ubuntu-jammy-20250529T081147
     ubuntu-noble: 2024.1-ubuntu-noble-20250529T081147
   magnum:
@@ -94,6 +95,6 @@ kolla_image_tags:
     ubuntu-jammy: 2024.1-ubuntu-jammy-20250819T151035
     ubuntu-noble: 2024.1-ubuntu-noble-20250819T151035
   rabbitmq:
-    rocky-9: 2024.1-rocky-9-20250722T083943
+    rocky-9: 2024.1-rocky-9-20250908T155427
     ubuntu-jammy: 2024.1-ubuntu-jammy-20250722T083943
     ubuntu-noble: 2024.1-ubuntu-noble-20250722T083943
diff --git a/etc/kayobe/kolla.yml b/etc/kayobe/kolla.yml
index 4b6c43bcc..b307ead03 100644
--- a/etc/kayobe/kolla.yml
+++ b/etc/kayobe/kolla.yml
@@ -227,8 +227,14 @@ stackhpc_rocky_9_third_party_repos:
     file: "CentOS-Ceph-Reef.repo"
     tag: "centos-ceph-reef"
   - url: "{{ stackhpc_repo_rhel9_rabbitmq_erlang_url }}"
-    file: "{{ 'copr-rabbitmq-erlang.repo' if kolla_base_arch == 'aarch64' else 'rabbitmq_rabbitmq-erlang.repo' }}"
-    tag: "{{ 'copr-rabbitmq-erlang' if kolla_base_arch == 'aarch64' else 'rabbitmq_rabbitmq-erlang' }}"
+    file: "rabbitmq_rabbitmq-erlang.repo"
+    tag: "rabbitmq_rabbitmq-erlang"
+  - url: "{{ stackhpc_repo_rhel9_rabbitmq_erlang_26_url }}"
+    file: "copr-rabbitmq-erlang-26.repo"
+    tag: "copr-rabbitmq-erlang-26"
+  - url: "{{ stackhpc_repo_rhel9_rabbitmq_erlang_27_url }}"
+    file: "copr-rabbitmq-erlang-27.repo"
+    tag: "copr-rabbitmq-erlang-27"
   - url: "{{ stackhpc_repo_rhel9_rabbitmq_server_url }}"
     file: "rabbitmq_rabbitmq-server.repo"
     tag: "rabbitmq_rabbitmq-server"
@@ -327,11 +333,13 @@ kolla_build_blocks:
         tar -czf /etc/yum.repos.d.backup/repos.tar.gz -C /etc/yum.repos.d . && \
     {% endif %}
     {% for repo in base_centos_repo_overrides_post_yum_list %}
+    if [ -f /etc/yum.repos.d/{{ repo.file }} ]; then \
         sed -i -e '/\[{{ repo.tag }}\]/,/^\[/ s/^\(mirrorlist *=.*\)/#\1/g' \
                -e '/\[{{ repo.tag }}\]/,/^\[/ s/^[# ]*\(baseurl *=.*\)/#\1/g' \
                -e '/\[{{ repo.tag }}\]/,/^\[/ s/^[ \t]*\(https.*\)/#\1/g' \
                -e '/\[{{ repo.tag }}\]/,/^\[/ s/^[# ]*\(metalink *=.*\)/#\1/g' \
-               -e '/\[{{ repo.tag }}\]/,/^\[/ s|^\(name.*\)|\1\nbaseurl={{ repo.url }}|' /etc/yum.repos.d/{{ repo.file }}{% if not loop.last %} &&{% endif %} \
+               -e '/\[{{ repo.tag }}\]/,/^\[/ s|^\(name.*\)|\1\nbaseurl={{ repo.url }}|' /etc/yum.repos.d/{{ repo.file }}; \
+    fi{% if not loop.last %} &&{% endif %} \
     {% endfor %}
     {% endif %}
   # With the UCA keyring installed we can now add all repos.
diff --git a/etc/kayobe/pulp-repo-versions.yml b/etc/kayobe/pulp-repo-versions.yml
index 87b557447..7ade702c4 100644
--- a/etc/kayobe/pulp-repo-versions.yml
+++ b/etc/kayobe/pulp-repo-versions.yml
@@ -22,7 +22,8 @@ stackhpc_pulp_repo_grafana_version: 20250615T005738
 stackhpc_pulp_repo_opensearch_2_x_version: 20250430T014638
 stackhpc_pulp_repo_opensearch_dashboards_2_x_version: 20250430T014638
 stackhpc_pulp_repo_rhel9_rabbitmq_erlang_version: 20250718T004955
-stackhpc_pulp_repo_rhel9_rabbitmq_erlang_aarch64_version: 20250721T162732
+stackhpc_pulp_repo_rhel9_rabbitmq_erlang_26_aarch64_version: 20250905T114106
+stackhpc_pulp_repo_rhel9_rabbitmq_erlang_27_aarch64_version: 20250905T114106
 stackhpc_pulp_repo_rhel9_rabbitmq_server_version: 20250708T003546
 stackhpc_pulp_repo_rhel_9_influxdb_version: 20241217T002152
 stackhpc_pulp_repo_rhel_9_influxdb_aarch64_version: 20241217T012754
diff --git a/etc/kayobe/pulp.yml b/etc/kayobe/pulp.yml
index 90dc7d54b..9f905ca80 100644
--- a/etc/kayobe/pulp.yml
+++ b/etc/kayobe/pulp.yml
@@ -258,7 +258,10 @@ stackhpc_pulp_repo_rocky_9_crb_version: "{{ lookup('vars', 'stackhpc_pulp_repo_r
 stackhpc_pulp_repo_rocky_9_highavailability_version: "{{ lookup('vars', 'stackhpc_pulp_repo_rocky_9_' ~ stackhpc_pulp_repo_rocky_9_minor_version ~ '_highavailability' ~ arch_suffix ~ '_version') }}"
 
 # Rocky 9 Multiarch repositories
-stackhpc_pulp_repo_multiarch_rhel9_rabbitmq_erlang_version: "{{ lookup('vars', 'stackhpc_pulp_repo_rhel9_rabbitmq_erlang' ~ arch_suffix ~ '_version') }}"
+#NOTE(bbezak): Versioned Erlang repos (aarch64 only). Fallback to generic Erlang version if not defined.
+stackhpc_pulp_repo_multiarch_rhel9_rabbitmq_erlang_version: "{{ lookup('vars', 'stackhpc_pulp_repo_rhel9_rabbitmq_erlang' ~ arch_suffix ~ '_version', default=stackhpc_pulp_repo_rhel9_rabbitmq_erlang_version) }}"
+stackhpc_pulp_repo_multiarch_rhel9_rabbitmq_erlang_26_version: "{{ lookup('vars', 'stackhpc_pulp_repo_rhel9_rabbitmq_erlang_26' ~ arch_suffix ~ '_version', default=stackhpc_pulp_repo_multiarch_rhel9_rabbitmq_erlang_version) }}"
+stackhpc_pulp_repo_multiarch_rhel9_rabbitmq_erlang_27_version: "{{ lookup('vars', 'stackhpc_pulp_repo_rhel9_rabbitmq_erlang_27' ~ arch_suffix ~ '_version', default=stackhpc_pulp_repo_multiarch_rhel9_rabbitmq_erlang_version) }}"
 stackhpc_pulp_repo_multiarch_centos_stream_9_nfv_openvswitch_version: "{{ lookup('vars', 'stackhpc_pulp_repo_centos_stream_9_nfv_openvswitch' ~ arch_suffix ~ '_version') }}"
 stackhpc_pulp_repo_multiarch_centos_stream_9_openstack_caracal_version: "{{ lookup('vars', 'stackhpc_pulp_repo_centos_stream_9_openstack_caracal' ~ arch_suffix ~ '_version') }}"
 stackhpc_pulp_repo_multiarch_centos_stream_9_opstools_version: "{{ lookup('vars', 'stackhpc_pulp_repo_centos_stream_9_opstools' ~ arch_suffix ~ '_version') }}"
diff --git a/etc/kayobe/stackhpc.yml b/etc/kayobe/stackhpc.yml
index 847187013..b5d23e77b 100644
--- a/etc/kayobe/stackhpc.yml
+++ b/etc/kayobe/stackhpc.yml
@@ -83,6 +83,13 @@ stackhpc_repo_grafana_version: "{{ stackhpc_repo_distribution }}"
 # RabbitMQ - Erlang for RHEL 9
 stackhpc_repo_rhel9_rabbitmq_erlang_url: "{{ stackhpc_repo_mirror_url }}/pulp/content/rabbitmq/erlang/el/9/{{ kolla_base_arch }}/{{ stackhpc_repo_rhel9_rabbitmq_erlang_version }}"
 stackhpc_repo_rhel9_rabbitmq_erlang_version: "{{ stackhpc_repo_distribution }}"
+# RabbitMQ - Erlang 26 for RHEL 9 (aarch64)
+stackhpc_repo_rhel9_rabbitmq_erlang_26_url: "{{ stackhpc_repo_mirror_url }}/pulp/content/rabbitmq/erlang-26/el/9/aarch64/{{ stackhpc_repo_rhel9_rabbitmq_erlang_26_version }}"
+stackhpc_repo_rhel9_rabbitmq_erlang_26_version: "{{ stackhpc_repo_distribution }}"
+
+# RabbitMQ - Erlang 27 for RHEL 9 (aarch64)
+stackhpc_repo_rhel9_rabbitmq_erlang_27_url: "{{ stackhpc_repo_mirror_url }}/pulp/content/rabbitmq/erlang-27/el/9/aarch64/{{ stackhpc_repo_rhel9_rabbitmq_erlang_27_version }}"
+stackhpc_repo_rhel9_rabbitmq_erlang_27_version: "{{ stackhpc_repo_distribution }}"
 
 # RabbitMQ for RHEL 9
 stackhpc_repo_rhel9_rabbitmq_server_url: "{{ stackhpc_repo_mirror_url }}/pulp/content/rabbitmq/rabbitmq-server/el/9/noarch/{{ stackhpc_repo_rhel9_rabbitmq_server_version }}"
@@ -165,7 +172,7 @@ stackhpc_repo_elrepo_9_version: "{{ stackhpc_repo_distribution }}"
 
 # Kolla source repository.
 stackhpc_kolla_source_url: "https://github.com/stackhpc/kolla"
-stackhpc_kolla_source_version: stackhpc/18.7.0.12
+stackhpc_kolla_source_version: stackhpc/18.7.0.13
 
 # Kolla Ansible source repository.
 stackhpc_kolla_ansible_source_url: "https://github.com/stackhpc/kolla-ansible"
diff --git a/releasenotes/notes/erlang-aarch64-repo-change-a77c49c408413857.yaml b/releasenotes/notes/erlang-aarch64-repo-change-a77c49c408413857.yaml
new file mode 100644
index 000000000..0bd6a8c62
--- /dev/null
+++ b/releasenotes/notes/erlang-aarch64-repo-change-a77c49c408413857.yaml
@@ -0,0 +1,7 @@
+---
+fixes:
+  - |
+    Switch aarch64 Erlang RPMs to versioned erlang-26 and erlang-27 COPR
+    repositories to support RabbitMQ 3.13/4.1 and align with Kolla [1].
+    x86_64 remains unchanged.
+    [1] https://review.opendev.org/c/openstack/kolla/+/959692