diff --git a/purithm/src/main/java/com/example/purithm/domain/filter/dto/response/DatedFilterDto.java b/purithm/src/main/java/com/example/purithm/domain/filter/dto/response/DatedFilterDto.java
index 6dfecc3..4a7585e 100644
--- a/purithm/src/main/java/com/example/purithm/domain/filter/dto/response/DatedFilterDto.java
+++ b/purithm/src/main/java/com/example/purithm/domain/filter/dto/response/DatedFilterDto.java
@@ -2,6 +2,7 @@
 
 import java.text.SimpleDateFormat;
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.Date;
 import java.util.HashMap;
 import java.util.List;
@@ -60,6 +61,7 @@ public static List<GroupedFilterLogDto> groupByDate(List<FilterLogDto> filterLog
 			groupedFilters.add(groupedFilter);
 		}
 
+		Collections.sort(groupedFilters, (s1, s2) -> s1.getDate().compareTo(s2.getDate()));
 		return groupedFilters;
 	}
 }
diff --git a/purithm/src/main/java/com/example/purithm/domain/filter/dto/response/DatedStampDto.java b/purithm/src/main/java/com/example/purithm/domain/filter/dto/response/DatedStampDto.java
index 22275dd..ed66629 100644
--- a/purithm/src/main/java/com/example/purithm/domain/filter/dto/response/DatedStampDto.java
+++ b/purithm/src/main/java/com/example/purithm/domain/filter/dto/response/DatedStampDto.java
@@ -2,6 +2,7 @@
 
 import java.text.SimpleDateFormat;
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.Date;
 import java.util.HashMap;
 import java.util.List;
@@ -61,6 +62,7 @@ public static List<GroupedStampDto> groupByDate(List<StampDto> stampDtos) {
 			groupedStamps.add(groupedStamp);
 		}
 
+		Collections.sort(groupedStamps, (s1, s2) -> s1.getDate().compareTo(s2.getDate()));
 		return groupedStamps;
 	}
 }
diff --git a/purithm/src/main/java/com/example/purithm/domain/filter/entity/Membership.java b/purithm/src/main/java/com/example/purithm/domain/filter/entity/Membership.java
index 390e213..a11e754 100644
--- a/purithm/src/main/java/com/example/purithm/domain/filter/entity/Membership.java
+++ b/purithm/src/main/java/com/example/purithm/domain/filter/entity/Membership.java
@@ -3,5 +3,15 @@
 public enum Membership {
   BASIC,
   PREMIUM,
-  PREMIUM_PLUS
+  PREMIUM_PLUS;
+
+  public static Membership checkMembership(int numOfReviews) {
+    if (numOfReviews >= 8) {
+      return PREMIUM_PLUS;
+    }
+    if (numOfReviews >= 4) {
+      return PREMIUM;
+    }
+    return BASIC;
+  }
 }
diff --git a/purithm/src/main/java/com/example/purithm/domain/review/service/ReviewService.java b/purithm/src/main/java/com/example/purithm/domain/review/service/ReviewService.java
index 650f42c..9c96b2c 100644
--- a/purithm/src/main/java/com/example/purithm/domain/review/service/ReviewService.java
+++ b/purithm/src/main/java/com/example/purithm/domain/review/service/ReviewService.java
@@ -73,13 +73,8 @@ public CreatedReviewDto writeReview(Long id, ReviewRequestDto request) {
 
 	private void upgradeMembership(User user) {
 		int numOfReviews = reviewRepository.countAllByUser(user);
-		if (numOfReviews == 16) {
-			user.upgradeToPremiumPlus();
-			userRepository.save(user);
-		} else if (numOfReviews == 8) {
-			user.upgradeToPremium();
-			userRepository.save(user);
-		}
+		user.updateMembership(numOfReviews);
+		userRepository.save(user);
 	}
 
 	public List<FeedDto> getFeeds(OS os, String sortedBy, Long userId) {
diff --git a/purithm/src/main/java/com/example/purithm/domain/user/entity/User.java b/purithm/src/main/java/com/example/purithm/domain/user/entity/User.java
index eb8ad2b..dbebe46 100644
--- a/purithm/src/main/java/com/example/purithm/domain/user/entity/User.java
+++ b/purithm/src/main/java/com/example/purithm/domain/user/entity/User.java
@@ -62,12 +62,11 @@ public class User {
   public void agreeToTerms() {
     this.terms = true;
   }
-  public void upgradeToPremium() {
-    this.membership = Membership.PREMIUM;
-  }
-  public void upgradeToPremiumPlus() {
-    this.membership = Membership.PREMIUM_PLUS;
+
+  public void updateMembership(int numOfReviews) {
+    this.membership = Membership.checkMembership(numOfReviews);
   }
+
   public void updateProfile(UserInfoRequestDto userInfo) {
     this.profile = userInfo.profile();
     this.username = userInfo.name();