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@@ -1,5 +1,54 @@
 # Changelog
 
+## v1.9.x
+
+### Migration Guide
+
+Follow these steps to upgrade to version 1.9.x from 1.8.x
+
+- For OpenShift: update the channel from `release-1.8` to `release-1.9` in your OLM Subscription.
+- For Kubernetes: update the Helm chart version to `1.9.x`.
+
+#### Troubleshooting Steps for Upgrade
+
+- If CRD-related errors occur after upgrade, such as a field not being defined for FinOps CRs, purge the FinOps CRDs and trigger a re-install:
+
+    ```bash
+    # Purge FinOps CRDs
+    kubectl get crds -o name | grep finops.stakater.com | xargs -r kubectl delete
+
+    # Trigger re-install by deleting the FinOps Operator CR
+    kubectl delete finopsoperators.dependencies.tenantoperator.stakater.com -n multi-tenant-operator tenant-operator-finops
+    ```
+
+### v1.9.0
+
+_**July 16, 2026**_
+
+#### Enhancements
+
+- Bumped FinOps Operator and FinOps Gateway to `v0.1.3`.
+- The managed Prometheus instance now defaults to a `retentionSize` of `5GB`, capping the on-disk storage used for metrics.
+
+#### Component Updates
+
+| Name | Tag | Image |
+| --- | --- | --- |
+| `tenant-operator`         | v1.9.0              | `ghcr.io/stakater/public/mto/tenant-operator`             |
+| `mto-console`             | 1.0.246             | `ghcr.io/stakater/public/mto/mto-console`                 |
+| `mto-gateway`             | 1.0.172             | `ghcr.io/stakater/public/mto/mto-gateway`                 |
+| `finops-operator`         | v0.1.3              | `ghcr.io/stakater/public/finops-operator`                 |
+| `finops-gateway`          | v0.1.3              | `ghcr.io/stakater/public/finops-gateway`                  |
+| `mto-dependencies-operator` | v0.0.12           | `ghcr.io/stakater/public/mto-dependencies-operator`       |
+| `dex-config-operator`     | v0.0.6              | `ghcr.io/stakater/public/dex-config-operator`             |
+| `template-operator`       | v0.1.5              | `ghcr.io/stakater/public/template-operator`               |
+| `hibernation-operator`    | v0.1.103            | `ghcr.io/stakater/public/hibernation-operator`            |
+| `postgresql`              | 18.2                | `ghcr.io/stakater/public/mto/postgresql`                  |
+| `dex`                     | v0.0.1              | `ghcr.io/stakater/public/mto/dex`                         |
+| `prometheus`              | v2.55.1             | `quay.io/prometheus/prometheus`                           |
+| `kube-state-metrics`      | v2.17.0             | `registry.k8s.io/kube-state-metrics/kube-state-metrics`   |
+| `opencost`                | 1.117.3             | `ghcr.io/opencost/opencost`                               |
+
 ## v1.8.x
 
 ### Migration Guide