diff --git a/pkg/core/mem_pool.go b/pkg/core/mem_pool.go
index 8af3bdc35..52611dc74 100644
--- a/pkg/core/mem_pool.go
+++ b/pkg/core/mem_pool.go
@@ -226,8 +226,8 @@ func NewMemPool(capacity int) MemPool {
 
 // TryGetValue returns a transaction if it exists in the memory pool.
 func (mp MemPool) TryGetValue(hash util.Uint256) (*transaction.Transaction, bool) {
-	mp.lock.Lock()
-	defer mp.lock.Unlock()
+	mp.lock.RLock()
+	defer mp.lock.RUnlock()
 	if pItem, ok := mp.unsortedTxn[hash]; ok {
 		return pItem.txn, ok
 	}
@@ -271,8 +271,8 @@ func min(sortedPool PoolItems) *PoolItem {
 func (mp *MemPool) GetVerifiedTransactions() []*transaction.Transaction {
 	var t []*transaction.Transaction
 
-	mp.lock.Lock()
-	defer mp.lock.Unlock()
+	mp.lock.RLock()
+	defer mp.lock.RUnlock()
 	for _, p := range mp.unsortedTxn {
 		t = append(t, p.txn)
 	}