diff --git a/README.md b/README.md
index 7cc5be2..4641d78 100644
--- a/README.md
+++ b/README.md
@@ -34,17 +34,17 @@ Infrastructure-as-Code for a 3-machine homelab running K3s.
 
 ```
 ansible/
-  inventory.yml              # host definitions
+  inventory.yaml              # host definitions
   playbooks/
-    bootstrap-minisforum.yml # OS hardening, packages, UFW, /data dirs
-    setup-k3s.yml            # K3s server install, Helm, kubeconfig
+    bootstrap-minisforum.yaml # OS hardening, packages, UFW, /data dirs
+    setup-k3s.yaml            # K3s server install, Helm, kubeconfig
   roles/
     common/                  # user, SSH hardening, UFW, base packages
     k3s-server/              # K3s server install + Helm
 values/
-  traefik.yml                ✅ deployed
-  gitea.yml                  🔧 in progress
-  pihole.yml                 🔧 in progress
+  traefik.yaml                ✅ deployed
+  gitea.yaml                  🔧 in progress
+  pihole.yaml                 🔧 in progress
 old.debian-data/             # gitignored — backup of pre-migration configs
 ```
 
@@ -70,28 +70,28 @@ kubectl get pods -A
 
 ```bash
 # Re-run bootstrap (idempotent)
-ansible-playbook -i ansible/inventory.yml ansible/playbooks/bootstrap-minisforum.yml
+ansible-playbook -i ansible/inventory.yaml ansible/playbooks/bootstrap-minisforum.yaml
 
 # Re-run K3s setup (idempotent)
-ansible-playbook -i ansible/inventory.yml ansible/playbooks/setup-k3s.yml
+ansible-playbook -i ansible/inventory.yaml ansible/playbooks/setup-k3s.yaml
 
 # Traefik
 helm repo add traefik https://helm.traefik.io/traefik && helm repo update
 helm upgrade --install traefik traefik/traefik \
   --namespace traefik --create-namespace \
-  -f values/traefik.yml
+  -f values/traefik.yaml
 
 # Gitea
 helm repo add gitea-charts https://dl.gitea.com/charts/ && helm repo update
 helm upgrade --install gitea gitea-charts/gitea \
   --namespace gitea --create-namespace \
-  -f values/gitea.yml
+  -f values/gitea.yaml
 
 # Pi-hole
 helm repo add mojo2600 https://mojo2600.github.io/pihole-kubernetes/ && helm repo update
 helm upgrade --install pihole mojo2600/pihole \
   --namespace pihole --create-namespace \
-  -f values/pihole.yml
+  -f values/pihole.yaml
 ```
 
 ## See Also
diff --git a/ansible.cfg b/ansible.cfg
index ed4ca29..4683d3a 100644
--- a/ansible.cfg
+++ b/ansible.cfg
@@ -1,4 +1,4 @@
 [defaults]
-inventory = ansible/inventory.yml
+inventory = ansible/inventory.yaml
 roles_path = ansible/roles
 host_key_checking = False