diff --git a/os_traits/compute/migrate.py b/os_traits/compute/migrate.py
index 441a64d..454a1b7 100644
--- a/os_traits/compute/migrate.py
+++ b/os_traits/compute/migrate.py
@@ -13,7 +13,7 @@
 # under the License.
 
 TRAITS = [
-    # ref: http://specs.openstack.org/openstack/nova-specs/specs/train/approved/expose-auto-converge-post-copy.html#proposed-change  # noqa
+    # ref: http://specs.openstack.org/openstack/nova-specs/specs/train/approved/expose-auto-converge-post-copy.html  # noqa
     'AUTO_CONVERGE',
     'POST_COPY',
 ]
diff --git a/os_traits/compute/security.py b/os_traits/compute/security.py
index 044fac9..2f25cf9 100644
--- a/os_traits/compute/security.py
+++ b/os_traits/compute/security.py
@@ -13,14 +13,12 @@
 # under the License.
 
 TRAITS = [
-    # ref: https://specs.openstack.org/openstack/nova-specs/specs/stein/
-    # approved/add-emulated-virtual-tpm.html
+    # ref: https://specs.openstack.org/openstack/nova-specs/specs/victoria/implemented/add-emulated-virtual-tpm.html  # noqa
     # support for TPM 1.2
     'TPM_1_2',
     # support for TPM 2.0
     'TPM_2_0',
     # support for UEFI Secure Boot
-    # ref:
-    # https://opendev.org/openstack/nova-specs/src/branch/master/specs/wallaby/approved/allow-secure-boot-for-qemu-kvm-guests.rst#fnref8
+    # ref: https://specs.openstack.org/openstack/nova-specs/specs/wallaby/implemented/allow-secure-boot-for-qemu-kvm-guests.html  # noqa
     'UEFI_SECURE_BOOT'
 ]
diff --git a/os_traits/hw/cpu/x86/amd.py b/os_traits/hw/cpu/x86/amd.py
index 2137189..6645745 100644
--- a/os_traits/hw/cpu/x86/amd.py
+++ b/os_traits/hw/cpu/x86/amd.py
@@ -14,7 +14,7 @@
 
 
 TRAITS = [
-    # ref: http://specs.openstack.org/openstack/nova-specs/specs/train/approved/amd-sev-libvirt-support.html # noqa
+    # ref: https://specs.openstack.org/openstack/nova-specs/specs/train/implemented/amd-sev-libvirt-support.html # noqa
     'SEV',
     # ref: https://en.wikipedia.org/wiki/AMD-V
     'SVM',