diff --git a/docs/sources/helm-charts/mimir-distributed/release-notes/v5.2.md b/docs/sources/helm-charts/mimir-distributed/release-notes/v5.2.md
index 716fe41d2ab..659f1af7e91 100644
--- a/docs/sources/helm-charts/mimir-distributed/release-notes/v5.2.md
+++ b/docs/sources/helm-charts/mimir-distributed/release-notes/v5.2.md
@@ -22,3 +22,9 @@ Notable enhancements are as follows:
 
 - The lifecycle management of persistent volumes belonging to compactor, ingester, store-gateway and alertmanager components can now be configured via the parameters `enableRetentionPolicy`, `whenScaled` and `whenDeleted`.
 - The chart now supports the option to use a plain `Ingress` resource instead of a gateway service.
+
+## Bug fixes
+
+### 5.2.1
+
+- [PR 7199](https://github.com/grafana/mimir/pull/7199): Revert [PR 6999](https://github.com/grafana/mimir/pull/6999), introduced in 5.2.0, which broke installations relying on the default value of `blocks_storage.backend: s3`. If `mimir.structuredConfig.blocks_storage.backend: s3` wasn't explicitly set, then Mimir would fail to connect to S3 and will instead try to read and write blocks to the local filesystem.
diff --git a/operations/helm/charts/mimir-distributed/CHANGELOG.md b/operations/helm/charts/mimir-distributed/CHANGELOG.md
index 10850ee316f..86d3cad9bb9 100644
--- a/operations/helm/charts/mimir-distributed/CHANGELOG.md
+++ b/operations/helm/charts/mimir-distributed/CHANGELOG.md
@@ -28,6 +28,10 @@ Entries should include a reference to the Pull Request that introduced the chang
 
 ## main / unreleased
 
+## 5.2.1
+
+* [BUGFIX] Revert [PR 6999](https://github.com/grafana/mimir/pull/6999), introduced in 5.2.0, which broke installations relying on the default value of `blocks_storage.backend: s3`. If `mimir.structuredConfig.blocks_storage.backend: s3` wasn't explicitly set, then Mimir would fail to connect to S3 and will instead try to read and write blocks to the local filesystem. #7199
+
 ## 5.2.0
 
 * [CHANGE] Remove deprecated configuration parameter `blocks_storage.bucket_store.max_chunk_pool_bytes`. #6673
diff --git a/operations/helm/charts/mimir-distributed/Chart.yaml b/operations/helm/charts/mimir-distributed/Chart.yaml
index dbdfbb97e9b..b8615a842b9 100644
--- a/operations/helm/charts/mimir-distributed/Chart.yaml
+++ b/operations/helm/charts/mimir-distributed/Chart.yaml
@@ -1,5 +1,5 @@
 apiVersion: v2
-version: 5.2.0
+version: 5.2.1
 appVersion: 2.11.0
 description: "Grafana Mimir"
 home: https://grafana.com/docs/helm-charts/mimir-distributed/latest/
diff --git a/operations/helm/charts/mimir-distributed/README.md b/operations/helm/charts/mimir-distributed/README.md
index 463224ec985..6dabe9f02a9 100644
--- a/operations/helm/charts/mimir-distributed/README.md
+++ b/operations/helm/charts/mimir-distributed/README.md
@@ -4,7 +4,7 @@ Helm chart for deploying [Grafana Mimir](https://grafana.com/docs/mimir/latest/)
 
 For the full documentation, visit [Grafana mimir-distributed Helm chart documentation](https://grafana.com/docs/helm-charts/mimir-distributed/latest/).
 
-> **Note:** The documentation version is derived from the Helm chart version which is 5.2.0.
+> **Note:** The documentation version is derived from the Helm chart version which is 5.2.1.
 
 When upgrading from Helm chart version 4.X, please see [Migrate the Helm chart from version 4.x to 5.0](https://grafana.com/docs/helm-charts/mimir-distributed/latest/migration-guides/migrate-helm-chart-4.x-to-5.0/).
 When upgrading from Helm chart version 3.x, please see [Migrate from single zone to zone-aware replication with Helm](https://grafana.com/docs/helm-charts/mimir-distributed/latest/migration-guides/migrate-from-single-zone-with-helm/).
@@ -14,7 +14,7 @@ When upgrading from Helm chart version 2.1, please see [Upgrade the Grafana Mimi
 
 # mimir-distributed
 
-![Version: 5.2.0](https://img.shields.io/badge/Version-5.2.0-informational?style=flat-square) ![AppVersion: 2.11.0](https://img.shields.io/badge/AppVersion-2.11.0-informational?style=flat-square)
+![Version: 5.2.1](https://img.shields.io/badge/Version-5.2.1-informational?style=flat-square) ![AppVersion: 2.11.0](https://img.shields.io/badge/AppVersion-2.11.0-informational?style=flat-square)
 
 Grafana Mimir