diff --git a/services/horizon/CHANGELOG.md b/services/horizon/CHANGELOG.md
index bd13a92d50..eb57cf5c3e 100644
--- a/services/horizon/CHANGELOG.md
+++ b/services/horizon/CHANGELOG.md
@@ -3,6 +3,14 @@
 All notable changes to this project will be documented in this
 file. This project adheres to [Semantic Versioning](http://semver.org/).
 
+## v2.15.1
+
+**Upgrading to this version from <= v2.8.3 will trigger a state rebuild. During this process (which will take at least 10 minutes), Horizon will not ingest new ledgers.**
+
+### Fixes
+
+* Fixed a regression preventing running multiple concurrent captive-core ingestion instances. ([4251](https://github.com/stellar/go/pull/4251))
+
 ## v2.15.0
 
 **Upgrading to this version from <= v2.8.3 will trigger a state rebuild. During this process (which will take at least 10 minutes), Horizon will not ingest new ledgers.**
@@ -14,6 +22,7 @@ file. This project adheres to [Semantic Versioning](http://semver.org/).
 ### Features
 
 * New feature, enable captive core based ingestion to use remote db persistence rather than in-memory for ledger states. Essentially moves what would have been stored in RAM to the external db instead. Recent profiling on the two approaches shows an approximate space usage of about 8GB for ledger states as of 02/2022 timeframe, but it will gradually continue to increase as more accounts/assets are added to network. Current horizon ingest behavior when configured for captive core usage will by default take this space from RAM, unless a new command line flag is specified `--captive-core-use-db=true`, which enables this space to be taken from the external db instead, and not RAM. The external db used is determined be setting `DATABASE` parameter in the captive core cfg/.toml file. If no value is set, then by default it uses sqlite and the db file is stored in `--captive-core-storage-path` - ([4092](https://github.com/stellar/go/pull/4092))
+  * Note, if using this feature, we recommend using a storage device with capacity for at least 3000 write ops/second.
 
 ### Fixes
 
diff --git a/services/horizon/internal/ingest/main.go b/services/horizon/internal/ingest/main.go
index b4b74fc3e6..365937940d 100644
--- a/services/horizon/internal/ingest/main.go
+++ b/services/horizon/internal/ingest/main.go
@@ -232,6 +232,7 @@ func NewSystem(config Config) (System, error) {
 					NetworkPassphrase:   config.NetworkPassphrase,
 					HistoryArchiveURLs:  []string{config.HistoryArchiveURL},
 					CheckpointFrequency: config.CheckpointFrequency,
+					LedgerHashStore:     ledgerbackend.NewHorizonDBLedgerHashStore(config.HistorySession),
 					Log:                 logger,
 					Context:             ctx,
 				},