diff --git a/CHANGELOG.md b/CHANGELOG.md
index fa1cc7fc5e..d7ee5b9a15 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [1.39.1](https://github.com/rudderlabs/rudder-server/compare/v1.39.0...v1.39.1) (2024-12-17)
+
+
+### Bug Fixes
+
+* processing pickup race condition ([#5374](https://github.com/rudderlabs/rudder-server/issues/5374)) ([21f0d13](https://github.com/rudderlabs/rudder-server/commit/21f0d13ffb64ff82fc147b46ca72b8e9c672b0ea))
+
 ## [1.39.0](https://github.com/rudderlabs/rudder-server/compare/v1.38.0...v1.39.0) (2024-12-10)
 
 
diff --git a/warehouse/router/router.go b/warehouse/router/router.go
index 7c02155477..b2e66d249d 100644
--- a/warehouse/router/router.go
+++ b/warehouse/router/router.go
@@ -74,6 +74,8 @@ type Router struct {
 	inProgressMap     map[workerIdentifierMapKey][]jobID
 	inProgressMapLock sync.RWMutex
 
+	processingMu sync.Mutex
+
 	scheduledTimesCache     map[string][]int
 	scheduledTimesCacheLock sync.RWMutex
 
@@ -371,18 +373,22 @@ loop:
 			continue
 		}
 
+		r.processingMu.Lock()
 		inProgressNamespaces := r.getInProgressNamespaces()
 		r.logger.Debugf(`Current inProgress namespace identifiers for %s: %v`, r.destType, inProgressNamespaces)
 
 		uploadJobsToProcess, err := r.uploadsToProcess(ctx, availableWorkers, inProgressNamespaces)
 		if err != nil && ctx.Err() == nil {
 			r.logger.Errorn("Error getting uploads to process", logger.NewErrorField(err))
+			r.processingMu.Unlock()
 			return err
 		}
-
 		for _, uploadJob := range uploadJobsToProcess {
 			r.setDestInProgress(uploadJob.warehouse, uploadJob.upload.ID)
+		}
+		r.processingMu.Unlock()
 
+		for _, uploadJob := range uploadJobsToProcess {
 			workerName := r.workerIdentifier(uploadJob.warehouse)
 
 			r.workerChannelMapLock.RLock()
@@ -596,6 +602,9 @@ func (r *Router) handlePriorityForWaitingUploads(ctx context.Context, warehouse
 		return defaultUploadPriority, nil
 	}
 
+	r.processingMu.Lock()
+	defer r.processingMu.Unlock()
+
 	// If it is present do nothing else delete it
 	if _, inProgress := r.isUploadJobInProgress(warehouse, latestInfo.ID); !inProgress {
 		if err := r.uploadRepo.DeleteWaiting(ctx, latestInfo.ID); err != nil {