diff --git a/backend/src/main/java/hanglog/expense/service/ExpenseService.java b/backend/src/main/java/hanglog/expense/service/ExpenseService.java
index d6e60f3e6..43a9d1c2e 100644
--- a/backend/src/main/java/hanglog/expense/service/ExpenseService.java
+++ b/backend/src/main/java/hanglog/expense/service/ExpenseService.java
@@ -20,9 +20,11 @@
 import java.util.Map;
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
 
 @Service
 @RequiredArgsConstructor
+@Transactional(readOnly = true)
 public class ExpenseService {
 
     private static final Currencies DEFAULT_CURRENCIES = Currencies.ofDefault();