diff --git a/exp/services/captivecore/internal/api.go b/exp/services/captivecore/internal/api.go
index 9b70c19188..9e666e565c 100644
--- a/exp/services/captivecore/internal/api.go
+++ b/exp/services/captivecore/internal/api.go
@@ -25,7 +25,7 @@ type rangeRequest struct {
 	readyDuration int
 	valid         bool
 	ready         bool
-	sync.RWMutex
+	sync.Mutex
 }
 
 // CaptiveCoreAPI manages a shared captive core subprocess and exposes an API for
@@ -141,8 +141,8 @@ func (c *CaptiveCoreAPI) PrepareRange(ledgerRange ledgerbackend.Range) (ledgerba
 
 // GetLatestLedgerSequence determines the latest ledger sequence available on the captive core instance.
 func (c *CaptiveCoreAPI) GetLatestLedgerSequence() (ledgerbackend.LatestLedgerSequenceResponse, error) {
-	c.activeRequest.RLock()
-	defer c.activeRequest.RUnlock()
+	c.activeRequest.Lock()
+	defer c.activeRequest.Unlock()
 
 	if !c.activeRequest.valid {
 		return ledgerbackend.LatestLedgerSequenceResponse{}, ErrMissingPrepareRange
@@ -152,13 +152,16 @@ func (c *CaptiveCoreAPI) GetLatestLedgerSequence() (ledgerbackend.LatestLedgerSe
 	}
 
 	seq, err := c.core.GetLatestLedgerSequence()
+	if err != nil {
+		c.activeRequest.valid = false
+	}
 	return ledgerbackend.LatestLedgerSequenceResponse{Sequence: seq}, err
 }
 
 // GetLedger fetches the ledger with the given sequence number from the captive core instance.
 func (c *CaptiveCoreAPI) GetLedger(sequence uint32) (ledgerbackend.LedgerResponse, error) {
-	c.activeRequest.RLock()
-	defer c.activeRequest.RUnlock()
+	c.activeRequest.Lock()
+	defer c.activeRequest.Unlock()
 
 	if !c.activeRequest.valid {
 		return ledgerbackend.LedgerResponse{}, ErrMissingPrepareRange
@@ -168,6 +171,9 @@ func (c *CaptiveCoreAPI) GetLedger(sequence uint32) (ledgerbackend.LedgerRespons
 	}
 
 	present, ledger, err := c.core.GetLedger(sequence)
+	if err != nil {
+		c.activeRequest.valid = false
+	}
 	return ledgerbackend.LedgerResponse{
 		Present: present,
 		Ledger:  ledgerbackend.Base64Ledger(ledger),
diff --git a/exp/services/captivecore/main.go b/exp/services/captivecore/main.go
index d4f02f0545..ef7055da18 100644
--- a/exp/services/captivecore/main.go
+++ b/exp/services/captivecore/main.go
@@ -101,7 +101,7 @@ func main() {
 		Run: func(_ *cobra.Command, _ []string) {
 			configOpts.Require()
 			configOpts.SetValues()
-			logger.Level = logLevel
+			logger.SetLevel(logLevel)
 
 			captiveConfig := ledgerbackend.CaptiveCoreConfig{
 				StellarCoreBinaryPath: binaryPath,
@@ -124,7 +124,8 @@ func main() {
 			if err != nil {
 				logger.WithError(err).Fatal("Could not create captive core instance")
 			}
-			api := internal.NewCaptiveCoreAPI(core, logger)
+			core.SetStellarCoreLogger(logger.WithField("subservice", "stellar-core"))
+			api := internal.NewCaptiveCoreAPI(core, logger.WithField("subservice", "api"))
 
 			supporthttp.Run(supporthttp.Config{
 				ListenAddr: fmt.Sprintf(":%d", port),
diff --git a/ingest/ledgerbackend/captive_core_backend.go b/ingest/ledgerbackend/captive_core_backend.go
index a69a222eb5..7fdade1632 100644
--- a/ingest/ledgerbackend/captive_core_backend.go
+++ b/ingest/ledgerbackend/captive_core_backend.go
@@ -326,9 +326,9 @@ func (c *CaptiveStellarCore) runFromParams(from uint32) (runFrom uint32, ledgerH
 	runFrom = from - 1
 	if c.ledgerHashStore != nil {
 		var exists bool
-		ledgerHash, exists, err = c.ledgerHashStore.GetLedgerHash(from)
+		ledgerHash, exists, err = c.ledgerHashStore.GetLedgerHash(runFrom)
 		if err != nil {
-			err = errors.Wrapf(err, "error trying to read ledger hash %d", from)
+			err = errors.Wrapf(err, "error trying to read ledger hash %d", runFrom)
 			return
 		}
 		if exists {
diff --git a/ingest/ledgerbackend/captive_core_backend_test.go b/ingest/ledgerbackend/captive_core_backend_test.go
index 98f6fe72b8..549ce25c8f 100644
--- a/ingest/ledgerbackend/captive_core_backend_test.go
+++ b/ingest/ledgerbackend/captive_core_backend_test.go
@@ -962,13 +962,13 @@ func TestCaptiveUseOfLedgerHashStore(t *testing.T) {
 		}, nil)
 
 	mockLedgerHashStore := &MockLedgerHashStore{}
-	mockLedgerHashStore.On("GetLedgerHash", uint32(1023)).
+	mockLedgerHashStore.On("GetLedgerHash", uint32(1022)).
 		Return("", false, fmt.Errorf("transient error")).Once()
-	mockLedgerHashStore.On("GetLedgerHash", uint32(255)).
+	mockLedgerHashStore.On("GetLedgerHash", uint32(254)).
 		Return("", false, nil).Once()
-	mockLedgerHashStore.On("GetLedgerHash", uint32(63)).
+	mockLedgerHashStore.On("GetLedgerHash", uint32(62)).
 		Return("cde", true, nil).Once()
-	mockLedgerHashStore.On("GetLedgerHash", uint32(127)).
+	mockLedgerHashStore.On("GetLedgerHash", uint32(126)).
 		Return("ghi", true, nil).Once()
 
 	captiveBackend := CaptiveStellarCore{
@@ -997,7 +997,7 @@ func TestCaptiveUseOfLedgerHashStore(t *testing.T) {
 	assert.Equal(t, uint32(64), nextLedger)
 
 	runFrom, ledgerHash, nextLedger, err = captiveBackend.runFromParams(1050)
-	assert.EqualError(t, err, "error trying to read ledger hash 1023: transient error")
+	assert.EqualError(t, err, "error trying to read ledger hash 1022: transient error")
 
 	runFrom, ledgerHash, nextLedger, err = captiveBackend.runFromParams(300)
 	assert.NoError(t, err)
diff --git a/services/horizon/CHANGELOG.md b/services/horizon/CHANGELOG.md
index 582c2194c3..a3e9b5c722 100644
--- a/services/horizon/CHANGELOG.md
+++ b/services/horizon/CHANGELOG.md
@@ -1,10 +1,15 @@
 # Changelog
 
 All notable changes to this project will be documented in this
-file. This project adheres to [Semantic Versioning](http://semver.org/).x
+file. This project adheres to [Semantic Versioning](http://semver.org/).
 
 ## Unreleased
 
+## v1.12.0
+
+* Add Prometheus metrics for the duration of ingestion processors ([#3224](https://github.com/stellar/go/pull/3224))
+* Many Captive Core improvements and fixes ([#3232](https://github.com/stellar/go/pull/3232), [#3223](https://github.com/stellar/go/pull/3223), [#3226](https://github.com/stellar/go/pull/3226), [#3203](https://github.com/stellar/go/pull/3203), [#3189](https://github.com/stellar/go/pull/3189),  [#3187](https://github.com/stellar/go/pull/3187))
+
 ## v1.11.1
 
 * Fix bug in parsing `db-url` parameter in `horizon db migrate` and `horizon db init` commands ([#3192](https://github.com/stellar/go/pull/3192)).