diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
index 847bd845..2ac98e7c 100644
--- a/.github/CODEOWNERS
+++ b/.github/CODEOWNERS
@@ -1,30 +1 @@
-# This is a comment.
-
-# Each line is a file pattern followed by one or more owners.
-
-# These owners will be the default owners for everything in the repo.
-*       @default-owner
-
-# Order is important. The last matching pattern has the most precedence.
-
-# To set ownership of a particular folder, add a line like this:
-/docs/          @documentation-team
-
-# To set ownership of all .js files in the src/js/ directory, add a line like this:
-/src/js/*.js    @js-developers
-
-# You can also specify individual users. This will make @octocat the owner of any .md files at the root of the repository:
-/*.md           @octocat
-
-# In this example, @doctocat owns any files in the /apps/ directory and any of its subdirectories.
-/apps/          @doctocat
-
-# The `@backend-team` team owns any files in the `/api/` directory in the root of your repository and any of its subdirectories.
-/api/           @backend-team
-
-# The `@frontend-team` team owns any files in the `/web/` directory in the root of your repository and any of its subdirectories.
-/web/           @frontend-team
-
-# Add this line at the end of the file to always require pull request reviews
-# when someone on the team is not an owner and the pull request modifies code owned by the team.
-*       @global-owner
+@0xPolygon/core-cdk
diff --git a/sequencesender/ethtx.go b/sequencesender/ethtx.go
index 77ca016a..6d3f4053 100644
--- a/sequencesender/ethtx.go
+++ b/sequencesender/ethtx.go
@@ -46,8 +46,12 @@ func (s *SequenceSender) sendTx(ctx context.Context, resend bool, txOldHash *com
 	var valueToAddress common.Address
 
 	if !resend {
+		s.nonceMutex.Lock()
+		nonce := s.currentNonce
+		s.currentNonce++
+		s.nonceMutex.Unlock()
+		paramNonce = &nonce
 		paramTo = to
-		paramNonce = &s.currentNonce
 		paramData = data
 		valueFromBatch = fromBatch
 		valueToBatch = toBatch
@@ -73,9 +77,6 @@ func (s *SequenceSender) sendTx(ctx context.Context, resend bool, txOldHash *com
 		log.Errorf("error adding sequence to ethtxmanager: %v", err)
 		return err
 	}
-	if !resend {
-		s.currentNonce++
-	}
 
 	// Add new eth tx
 	txData := ethTxData{
diff --git a/sequencesender/sequencesender.go b/sequencesender/sequencesender.go
index 144cb28a..b29d8ad3 100644
--- a/sequencesender/sequencesender.go
+++ b/sequencesender/sequencesender.go
@@ -25,6 +25,7 @@ type SequenceSender struct {
 	ethTxManager             *ethtxmanager.Client
 	etherman                 *etherman.Client
 	currentNonce             uint64
+	nonceMutex               sync.Mutex
 	latestVirtualBatchNumber uint64                     // Latest virtualized batch obtained from L1
 	latestVirtualTime        time.Time                  // Latest virtual batch timestamp
 	latestSentToL1Batch      uint64                     // Latest batch sent to L1
@@ -92,12 +93,14 @@ func (s *SequenceSender) Start(ctx context.Context) {
 
 	// Get current nonce
 	var err error
+	s.nonceMutex.Lock()
 	s.currentNonce, err = s.etherman.CurrentNonce(ctx, s.cfg.L2Coinbase)
 	if err != nil {
 		log.Fatalf("failed to get current nonce from %v, error: %v", s.cfg.L2Coinbase, err)
 	} else {
 		log.Infof("current nonce for %v is %d", s.cfg.L2Coinbase, s.currentNonce)
 	}
+	s.nonceMutex.Unlock()
 
 	// Get latest virtual state batch from L1
 	err = s.getLatestVirtualBatch()